<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0004-0622</journal-id>
<journal-title><![CDATA[Archivos Latinoamericanos de Nutrición]]></journal-title>
<abbrev-journal-title><![CDATA[ALAN]]></abbrev-journal-title>
<issn>0004-0622</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Latinoamericana de Nutrición]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0004-06222007000400010</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Bactérias do grupo Lactobacillus casei: caracterização, viabilidade como probióticos em alimentos e sua importância para a saúde humana]]></article-title>
<article-title xml:lang="en"><![CDATA[Bacteria of Lactobacillus casei group: characterization, viability as probiotic in food products and their importance for human health.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Buriti]]></surname>
<given-names><![CDATA[Flávia Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Isay Saad]]></surname>
<given-names><![CDATA[Susana Marta]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de São Paulo Faculdade de Ciências Farmacêuticas Departamento de Tecnologia Bioquímico-Farmacêutica]]></institution>
<addr-line><![CDATA[São Paulo SP]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>57</volume>
<numero>4</numero>
<fpage>373</fpage>
<lpage>380</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0004-06222007000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0004-06222007000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0004-06222007000400010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O grupo Lactobacillus casei compreende bactérias láticas fenotipicamente e geneticamente heterogêneas, aptas a colonizar vários ambientes naturais e criados pelo homem. As bactérias do grupo Lactobacillus casei têm sido amplamente estudadas com relação a suas propriedades promotoras à saúde. Várias funções benéficas ao organismo humano têm sido atribuídas ao consumo regular de alimentos contendo bactérias desse grupo. Tais bactériassão freqüentemente empregadas nas indústrias alimentícias visando a melhoria da qualidade de diferentes produtos. Diversos estudos têm sido conduzidos para avaliar a viabilidade de emprego de cepas do grupo Lactobacillus casei como probióticos em laticínios, sobremesas e outros alimentos. Mesmo com a importância desses microrganismos para a indústria, a taxonomia das bactérias dessegrupo ainda permanece confusa. Esta revisão discute importantes estudos relacionados à caracterização das bactérias do grupo Lactobacillus casei, a aplicação dessas bactérias como probióticos em diferentes alimentos e os principais efeitos benéficos atribuídos ao consumo regular de produtos contendo tais microrganismos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lactobacillus casei is a group of phenotypically and genetically heterogeneous lactic acid bacteria, able to colonize various natural and man-made environments. Strains of the Lactobacillus casei group have been widely studied with respect to their health-promoting properties. Several beneficial functions for the human organism have been attributed to regular consumption of food products containing these strains. Bacteria of the Lactobacillus casei group are of great interest for the food industry to improve food quality. A number of studies have been conducted in order to evaluate the viability of strains of Lactobacillus casei group as probiotic in dairy products, desserts, among others food products. Despite its importance for the food industry, the taxonomy of the Lactobacillus casei group is still unclear. This review discusses important studies related to characterization of strains of Lactobacillus casei group, the application of these bacteria as probiotic in different food products and the main beneficial effects attributed to regular consumption of products containing such microorganisms.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Grupo Lactobacillus casei]]></kwd>
<kwd lng="pt"><![CDATA[probióticos]]></kwd>
<kwd lng="pt"><![CDATA[taxonomia]]></kwd>
<kwd lng="pt"><![CDATA[efeitos benéficos]]></kwd>
<kwd lng="en"><![CDATA[Lactobacillus casei group]]></kwd>
<kwd lng="en"><![CDATA[probiotics]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="en"><![CDATA[health benefits]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <b>     <p ALIGN="center" style="line-height: 100%"><font size="3"><font COLOR="#231f20" face="Verdana">Bactérias do grupo Lactobacillus casei: caracterização,</font></font></b><font face="Verdana" size="3"> <font COLOR="#231f20"><b>viabilidade como probióticos em alimentos e sua importância</b></font> </font><b><font COLOR="#231f20" face="Verdana" size="3">para a saúde humana</font></p> </b>     <p ALIGN="center" style="line-height: 100%"><b><font COLOR="#231f20" face="Verdana" size="2">Flávia Carolina Alonso Buriti y Susana Marta Isay Saad</font></b></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Departamento de Tecnologia Bioquímico-Farmacêutica, Faculdade de Ciências Farmacêuticas,</font> <font COLOR="#231f20">Universidade de São Paulo- São Paulo, SP, Brasil</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><b><font COLOR="#231f20" face="Verdana" size="2">RESUMO. </font></b></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">O grupo Lactobacillus casei compreende bactérias láticas</font> <font COLOR="#231f20">fenotipicamente e geneticamente heterogêneas, aptas a colonizar</font> <font COLOR="#231f20">vários ambientes naturais e criados pelo homem. As bactérias do</font> <font COLOR="#231f20">grupo Lactobacillus casei têm sido amplamente estudadas com</font> <font COLOR="#231f20">relação a suas propriedades promotoras à saúde. Várias funções</font> <font COLOR="#231f20">benéficas ao organismo humano têm sido atribuídas ao consumo</font> <font COLOR="#231f20">regular de alimentos contendo bactérias desse grupo. Tais bactériassão freqüentemente empregadas nas indústrias alimentícias visando</font> <font COLOR="#231f20">a melhoria da qualidade de diferentes produtos. Diversos estudos</font> <font COLOR="#231f20">têm sido conduzidos para avaliar a viabilidade de emprego de cepas</font> <font COLOR="#231f20">do grupo Lactobacillus casei como probióticos em laticínios,</font> <font COLOR="#231f20">sobremesas e outros alimentos. Mesmo com a importância desses</font> <font COLOR="#231f20">microrganismos para a indústria, a taxonomia das bactérias dessegrupo ainda permanece confusa. Esta revisão discute importantes</font> <font COLOR="#231f20">estudos relacionados à caracterização das bactérias do grupo</font> <font COLOR="#231f20">Lactobacillus casei, a aplicação dessas bactérias como probióticos</font> <font COLOR="#231f20">em diferentes alimentos e os principais efeitos benéficos atribuídos</font> <font COLOR="#231f20">ao consumo regular de produtos contendo tais microrganismos</font></font><font COLOR="#231f20" face="Verdana" size="2">.</font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">Palavras chave: </font></b><font face="Verdana" size="2"><font COLOR="#231f20">Grupo Lactobacillus casei, probióticos, taxonomia,</font> <font COLOR="#231f20">efeitos benéficos.</font></font></p> <b>     <p ALIGN="center" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Bacteria of Lactobacillus casei group:</font></font></b><font face="Verdana" size="2"> </font><b><font COLOR="#231f20" face="Verdana" size="2">characterization, viability as probiotic in food products and their </font><font COLOR="#231f20" face="Verdana" size="2">importance for human health. </font></b></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">SUMMARY. </font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Lactobacillus casei is a group of</font> <font COLOR="#231f20">phenotypically and genetically heterogeneous lactic acid bacteria,</font> <font COLOR="#231f20">able to colonize various natural and man-made environments. Strains</font> <font COLOR="#231f20">of the Lactobacillus casei group have been widely studied with respect</font> <font COLOR="#231f20">to their health-promoting properties. Several beneficial functions for</font> <font COLOR="#231f20">the human organism have been attributed to regular consumption of</font> <font COLOR="#231f20">food products containing these strains. Bacteria of the Lactobacillus</font> <font COLOR="#231f20">casei group are of great interest for the food industry to improve</font> <font COLOR="#231f20">food quality. A number of studies have been conducted in order to</font> <font COLOR="#231f20">evaluate the viability of strains of Lactobacillus casei group as</font> <font COLOR="#231f20">probiotic in dairy products, desserts, among others food products.</font> <font COLOR="#231f20">Despite its importance for the food industry, the taxonomy of the</font> <font COLOR="#231f20">Lactobacillus casei group is still unclear. This review discusses</font> <font COLOR="#231f20">important studies related to characterization of strains of Lactobacillus</font> <font COLOR="#231f20">casei group, the application of these bacteria as probiotic in different</font> <font COLOR="#231f20">food products and the main beneficial effects attributed to regular</font> <font COLOR="#231f20">consumption of products containing such microorganisms.</font> </font></p>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><b><font COLOR="#231f20">Key words: </font></b><font COLOR="#231f20">Lactobacillus casei group, probiotics, taxonomy, health</font> <font COLOR="#231f20">benefits.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font size="2"><b><font COLOR="#231f20" face="Verdana">Recibido:</font></b><font face="Verdana"><font COLOR="#231f20"> 30-07-2007</font> <font COLOR="#231f20"><b>Aceptado:</b> 10-10-2007</font></font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">INTRODUÇÃO</font></p>     <p ALIGN="LEFT" style="line-height: 100%"></b><font face="Verdana" size="2"><font COLOR="#231f20">As espécies Lactobacillus casei, Lactobacillus paracasei</font> <font COLOR="#231f20">e Lactobacillus rhamnosus fazem parte do chamado &quot;Grupo</font> <font COLOR="#231f20">Lactobacillus casei&quot; e possuem importante valor comercial</font> <font COLOR="#231f20">para a indústria alimentícia, devido ao seu emprego na</font> <font COLOR="#231f20">produção de leites fermentados e como culturas iniciadoras</font> <font COLOR="#231f20">de fermentação na fabricação de queijos para a melhoria de</font> <font COLOR="#231f20">sua qualidade (1-3). As referidas cepas também são aptas a</font> <font COLOR="#231f20">colonizar vários ambientes naturais e criados pelo homem,</font> <font COLOR="#231f20">como boca, trato intestinal e vagina humanos, laticínios e</font> <font COLOR="#231f20">produtos vegetais, ensilagem, esgoto e alimentos deteriorados.</font> <font COLOR="#231f20">Tais microrganismos estão especificamente associados à</font> <font COLOR="#231f20">fermentação do pão e algumas fermentações de queijos em</font> <font COLOR="#231f20">salmouras, além de também causarem deterioração de queijos</font> <font COLOR="#231f20">pela fermentação de citrato convertido em dióxido de carbono</font> <font COLOR="#231f20">(2,4,5).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Cepas de Lactobacillus casei/paracasei e Lactobacillus</font> <font COLOR="#231f20">rhamnosus têm sido amplamente estudadas com relação a suas</font> <font COLOR="#231f20">propriedades promotoras à saúde, sendo freqüentemente</font> <font COLOR="#231f20">empregadas como probióticos em alimentos industrializados</font> <font COLOR="#231f20">(2-4,6). Os probióticos são definidos como microrganismos</font> <font COLOR="#231f20">vivos que, quando administrados em quantidades adequadas,</font> <font COLOR="#231f20">afetam positivamente a saúde do hospedeiro(7). O</font> <font COLOR="#231f20">reconhecimento dos alimentos contendo probióticos como</font> <font COLOR="#231f20">alimentos funcionais que provêem benefícios além da nutrição</font> <font COLOR="#231f20">básica inerente e as emergentes evidências para seu potencial</font> <font COLOR="#231f20">na prevenção de doenças têm incentivado a divulgação e o</font> <font COLOR="#231f20">consumo desses produtos (8,9).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Os efeitos benéficos atribuídos aos microrganismos</font> <font COLOR="#231f20">probióticos têm sido alcançados principalmente através da</font> <font COLOR="#231f20">modulação da população e atividade da microbiota intestinal</font> <font COLOR="#231f20">(10). As espécies Lactobacillus casei/paracasei e</font> <font COLOR="#231f20">Lactobacillus rhamnosus constituem uma fração substancial</font> <font COLOR="#231f20">da microbiota constituída por Lactobacillus spp. na mucosa</font> <font COLOR="#231f20">intestinal humana (3).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A presente revisão discute importantes estudos envolvendo</font> <font COLOR="#231f20">bactérias do grupo Lactobacillus casei, particularmente as</font> <font COLOR="#231f20">espécies Lactobacillus casei, Lactobacillus paracasei e</font> <font COLOR="#231f20">Lactobacillus rhamnosus, relacionados à taxonomia, aplicação</font> <font COLOR="#231f20">em alimentos probióticos e aos efeitos benéficos in vivoatribuídos a essas cepas.</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">As bactérias láticas, OS Lactobacillus spp. E O GRUPO</font></b><font face="Verdana" size="2"> </font><b><font COLOR="#231f20" face="Verdana" size="2">Lactobacillus casei</font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Bactérias láticas são microrganismos Gram-positivos, nãoesporulados,</font> <font COLOR="#231f20">catalase-negativos, desprovidos de citocromos,</font> <font COLOR="#231f20">anaeróbios, mas aerotolerantes, ácido-tolerantes e estritamente</font> <font COLOR="#231f20">fermentativos (11). O ácido lático é o principal produto final da</font> <font COLOR="#231f20">fermentação de açúcares (12). Contudo, exceções desta descrição</font> <font COLOR="#231f20">geral ocorrem devido a algumas espécies poderem formar</font> <font COLOR="#231f20">catalase ou citocromos em meio contendo hematina ou compostos</font> <font COLOR="#231f20">relacionados. A produção de uma catalase não-heme, denominada</font> <font COLOR="#231f20">pseudocatalase, por alguns lactobacilos também causa alguma</font> <font COLOR="#231f20">confusão na identificação de bactérias láticas (11).</font> </font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">As primeiras definições de bactérias láticas baseavam-se</font> <font COLOR="#231f20">na capacidade de fermentação e coagulação do leite por esse</font> <font COLOR="#231f20">grupo de microrganismos, incluindo também os coliformes.</font> <font COLOR="#231f20">A descrição de Lactobacillus por Beijerinck em 1901 como</font> <font COLOR="#231f20">bactérias Gram-positivas separou os coliformes das bactérias</font>&nbsp; <font COLOR="#231f20">láticas (4).</font> </font></p>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">O interesse pela presença dos lactobacilos na dieta humana</font> <font COLOR="#231f20">aumentou desde o início do século XX, quando Elie</font> <font COLOR="#231f20">Metchnikoff – Instituto Pasteur, Paris – promoveu o uso desses</font> <font COLOR="#231f20">microrganismos para a bacterioprofilaxia e bacterioterapia (4).</font> </font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Dentre as bactérias láticas, o grupo Lactobacillus casei</font> <font COLOR="#231f20">compreende aquelas fenotipicamente e geneticamente</font> <font COLOR="#231f20">heterogêneas, capazes de manter o equilíbrio de vários</font> <font COLOR="#231f20">ambientes. Destacam-se nesse grupo os lactobacilos típicos</font> <font COLOR="#231f20">do hospedeiro humano, os quais incluem as espécies</font> <font COLOR="#231f20">Lactobacillus casei, Lactobacillus paracasei e Lactobacillus</font> <font COLOR="#231f20">rhamnosus, além de Lactobacillus zeae (11,13).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">O gênero Lactobacillus é filogeneticamente diverso (11).</font> <font COLOR="#231f20">No Bergey’s Manual of Systematic Bacteriology, o gênero</font> <font COLOR="#231f20">Lactobacillus é descrito como um grupo heterogêneo de</font> <font COLOR="#231f20">‘bastonetes regulares, Gram-positivos e não-esporulados’. Com</font> <font COLOR="#231f20">o desenvolvimento das análises filogenéticas nos anos 1980,</font> <font COLOR="#231f20">houve muitas alterações nesse gênero. O gênero Lactobacillusinclui cerca de 80 espécies reconhecidas (12), embora 5</font> <font COLOR="#231f20">espécies heterofermentativas de Lactobacillus tenham sido</font> <font COLOR="#231f20">transferidas para o gênero Weissella (3).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A divisão clássica dos lactobacilos está baseada em suas</font> <font COLOR="#231f20">características fermentativas: 1 – obrigatoriamente</font> <font COLOR="#231f20">homofermentativos; 2 – facultativamente heterofermentativos;</font> <font COLOR="#231f20">e 3 – obrigatoriamente heterofermentativos (12). Vários</font> <font COLOR="#231f20">lactobacilos obrigatoriamente homofermentativos e</font> <font COLOR="#231f20">facultativamente heterofermentativos e alguns</font> <font COLOR="#231f20">obrigatoriamente heterofermentativos são utilizados em</font> <font COLOR="#231f20">alimentos fermentados. Porém, esse último grupo é</font> <font COLOR="#231f20">comumente associado à deterioração de alimentos (3).</font> <font COLOR="#231f20">Os lactobacilos obrigatoriamente homofermentativos</font> <font COLOR="#231f20">incluem aqueles que fermentam glicose exclusivamente em</font> <font COLOR="#231f20">ácido lático e não fermentam pentoses ou gliconato (3).</font> <font COLOR="#231f20">Exemplos desse grupo são as espécies Lactobacillus</font> <font COLOR="#231f20">acidophilus, Lactobacillus gasseri, Lactobacillus crispatus,</font> <font COLOR="#231f20">Lactobacillus johnsonii, Lactobacillus delbrükii,</font> <font COLOR="#231f20">Lactobacillus helveticus e Lactobacillus salivarius (11,12).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Os obrigatoriamente heterofermentativos incluem os</font> <font COLOR="#231f20">lactobacilos que fermentam hexoses em ácido lático, ácido</font> <font COLOR="#231f20">acético e/ou etanol e dióxido de carbono, sendo que a produção</font> <font COLOR="#231f20">de gás a partir da glicose é uma característica marcante dessas</font> <font COLOR="#231f20">bactérias (3). São exemplos desse grupo as espécies</font> <font COLOR="#231f20">Lactobacillus brevis, Lactobacillus buchneri, Lactobacillus</font> <font COLOR="#231f20">fermentum e Lactobacillus reuteri (12,13).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Os facultativamente heterofermentativos incluem os</font> <font COLOR="#231f20">lactobacilos que fermentam hexoses em ácido-lático e podem</font> <font COLOR="#231f20">produzir gás a partir de gliconato, mas não através da glicose.</font> <font COLOR="#231f20">Esses microrganismos também fermentam pentoses, através</font> <font COLOR="#231f20">de uma fosfocetolase induzida para produzir ácidos lático e</font> <font COLOR="#231f20"> acético. As espécies Lactobacillus curvatus, Lactobacillus</font> <font COLOR="#231f20">plantarum, Lactobacillus sakei e do grupo Lactobacillus casei</font> <font COLOR="#231f20">são importantes representantes dos lactobacilos</font> <font COLOR="#231f20">facultativamente heterofermentativos (3,12).</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Caracterização e classificação de cepas do grupo</font></font></b><font face="Verdana" size="2"> </font><b><font COLOR="#231f20" face="Verdana" size="2">Lactobacillus casei</font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">As espécies Lactobacillus casei, Lactobacillus paracasei,</font> <font COLOR="#231f20">Lactobacillus zeae e Lactobacillus rhamnosus, que compõem</font> <font COLOR="#231f20">o grupo taxonômico Lactobacillus casei, apresentam</font> <font COLOR="#231f20">comportamento fisiológico e necessidades nutricionais muito</font> <font COLOR="#231f20">similares, multiplicando-se em condições ambientais bastante</font> <font COLOR="#231f20">semelhantes. Historicamente, a diferenciação entre cada uma</font> <font COLOR="#231f20">das espécies pertencentes a esse grupo e a sua sistemática</font> <font COLOR="#231f20">tem apresentado problemas e ajustes têm sido introduzidos</font> <font COLOR="#231f20">baseados em novos métodos taxonômicos que foram se</font> <font COLOR="#231f20">tornando disponíveis gradualmente (2,14).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Felis et al. (2) e Dellaglio et al. (15) relataram que a cepa</font> <font COLOR="#231f20">ATCC 393T foi designada como cepa-referência de</font> <font COLOR="#231f20">Lactobacillus casei subsp. casei por Hansen e Lessel em 1971,</font> <font COLOR="#231f20">com base somente em poucos aspectos fenotípicos.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Diversos autores citaram os estudos de homologia de DNA</font> <font COLOR="#231f20">realizados por Collins et al. (16), que ocasionaram a</font> <font COLOR="#231f20">reclassificação da maioria das cepas-referências de</font> <font COLOR="#231f20">Lactobacillus casei subsp. casei, Lactobacillus casei subsp.</font> <font COLOR="#231f20">alactosus e Lactobacillus casei subsp. pseudoplantarum como</font> <font COLOR="#231f20">espécies Lactobacillus paracasei (dada a elevada relação entre</font> <font COLOR="#231f20">o DNA dessas espécies, porém não relacionados à cepa ATCC</font> <font COLOR="#231f20">393T), além da mudança da denominação Lactobacillus casei</font> <font COLOR="#231f20">subsp. rhamnosus para Lactobacillus rhamnosus (2,4,15).</font> </font></p>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Dicks et al. (17) verificaram que a cepa Lactobacillus casei </font> <font COLOR="#231f20">subsp. </font><i><font COLOR="#231f20">casei </font></i><font COLOR="#231f20">ATCC 393T exibia baixos níveis de homologia</font> <font COLOR="#231f20">de DNA com outras cepas de </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">subsp. <i>casei</i></font> <font COLOR="#231f20">(8 a 46 %) e de </font><i><font COLOR="#231f20">Lactobacillus paracasei </font></i><font COLOR="#231f20">(30 a 50%), mas exibia80% de similaridade de DNA com <i>Lactobacillus rhamnosus</i></font> <font COLOR="#231f20">ATCC 15820, originalmente citada em 1959 por Kuznetsov</font> <font COLOR="#231f20">como cepa-referência de &quot;</font><i><font COLOR="#231f20">Lactobacterium zeae</font></i><font COLOR="#231f20">&quot;. Dicks </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">.</font> <font COLOR="#231f20">(17) forneceram novos indícios a favor da reclassificação da</font> <font COLOR="#231f20">cepa ATCC 334 como a nova cepa-referência de espécies</font> <i><font COLOR="#231f20">Lactobacillus casei</font></i><font COLOR="#231f20">. Segundo esses autores, a cepa ATCC 334</font> <font COLOR="#231f20">é geneticamente relacionada às cepas <i>Lactobacillus casei</i></font> <font COLOR="#231f20">subsp. </font><i><font COLOR="#231f20">casei </font></i><font COLOR="#231f20">(71 a 97%) e </font><i><font COLOR="#231f20">Lactobacillus paracasei </font></i><font COLOR="#231f20">(71% a</font> <font COLOR="#231f20">91%), é membro do mesmo perfil de proteína de grupo que</font> <font COLOR="#231f20">estes organismos e divide vários </font><i><font COLOR="#231f20">amplicons </font></i><font COLOR="#231f20">de DNA com cepas</font> <i><font COLOR="#231f20">Lactobacillus paracasei</font></i><font COLOR="#231f20">. Com base nessas investigações, os</font> <font COLOR="#231f20">autores propuseram que as cepas </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">subsp.</font> <i><font COLOR="#231f20">casei </font></i><font COLOR="#231f20">ATCC 393 e </font><i><font COLOR="#231f20">Lactobacillus rhamnosus </font></i><font COLOR="#231f20">ATCC 15820</font> <font COLOR="#231f20">fossem reclassificadas como membros da espécie</font> <i><font COLOR="#231f20">Lactobacillus zeae </font></i><font COLOR="#231f20">(cepa-referência ATCC 15820).</font> <font COLOR="#231f20">Propuseram ainda que a cepa ATCC 334 fosse designada como</font> <font COLOR="#231f20">a nova referência para </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">subsp. </font><i><font COLOR="#231f20">casei </font></i><font COLOR="#231f20">e que</font> <font COLOR="#231f20">o nome </font><i><font COLOR="#231f20">Lactobacillus paracasei </font></i><font COLOR="#231f20">fosse rejeitado.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Felis </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (2) investigaram a relação filogenética entre</font> <font COLOR="#231f20">espécies e cepas do grupo </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">(<i>Lactobacillus</i></font> <font COLOR="#231f20"><i>casei </i></font><font COLOR="#231f20">– ATCC 334 e ATCC 393T, <i>Lactobacillus paracasei</i></font> <font COLOR="#231f20">subsp. </font><i><font COLOR="#231f20">paracasei </font></i><font COLOR="#231f20">– NCDO 151T e LMG 9438, <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>paracasei </i>subsp. </font><i><font COLOR="#231f20">tolerans </font></i><font COLOR="#231f20">– LMG 9191T, <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>rhamnosus </i>LMG 6400T, </font><i><font COLOR="#231f20">Lactobacillus zeae </font></i><font COLOR="#231f20">LMG 17315T e</font> <i><font COLOR="#231f20">Lactobacillus </font></i><font COLOR="#231f20">sp. DF1). No referido estudo a distância</font> <font COLOR="#231f20">filogenética entre </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">ATCC 393T e</font> <i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">ATCC 334 mostrou-se maior que entre</font> <font COLOR="#231f20">ATCC 393T e a cepa de referência de </font><i><font COLOR="#231f20">Lactobacillus zeae</font></i><font COLOR="#231f20">.</font> <font COLOR="#231f20">Contrariamente, as distâncias entre as cepas de <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>paracasei </i>e </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">ATCC 334 foram virtualmente</font> <font COLOR="#231f20">zero, demonstrando que tais microrganismos formam um único</font> <font COLOR="#231f20">grupo filogenético. Além disso, houve alta similaridade</font> <font COLOR="#231f20">genética entre </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">ATCC 393T e <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>zeae </i>LMG 17315T, indicando que tais cepas são membros da</font> <font COLOR="#231f20">mesma espécie. Dessa forma, os autores, juntamente com</font> <font COLOR="#231f20">DELLAGLIO </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (15), propuseram à Comissão Judicial</font> <font COLOR="#231f20">(Judicial Commission of the International Committee on</font> <font COLOR="#231f20">Systematics of Prokaryotes) que considerassem a cepa ATCC</font> <font COLOR="#231f20">393T inadequada como referência para as espécies</font> <i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">e que a denominação <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>paracasei </i>fosse rejeitada, uma vez que as cepas ATCC 334 e</font> <font COLOR="#231f20">NCDO 151 são filogeneticamente indistinguíveis de muitas</font> <font COLOR="#231f20">cepas representativas de </font><i><font COLOR="#231f20">Lactobacillus casei</font></i><font COLOR="#231f20">. Ainda, segundo</font> <font COLOR="#231f20">Dellaglio </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (15), </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">deveria ser &quot;legítima</font> <font COLOR="#231f20">denominação&quot; das cepas </font><i><font COLOR="#231f20">Lactobacillus paracasei</font></i><font COLOR="#231f20">, e</font> <font COLOR="#231f20">propuseram que a cepa ATCC 334 fosse designada como a</font> <font COLOR="#231f20">nova cepa-referência para tais espécies, em reforço aos</font> <font COLOR="#231f20">trabalhos de Dicks </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (17) e Felis </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (2).</font> <font COLOR="#231f20">Em estudo anterior realizado por Schillinger (18),</font> <font COLOR="#231f20">envolvendo a identificação de cepas de </font><i><font COLOR="#231f20">Lactobacillus </font></i><font COLOR="#231f20">presentes</font> <font COLOR="#231f20">em iogurtes e outros produtos probióticos comerciais através</font> <font COLOR="#231f20">da técnica de hibridização de DNA, foi revelado que algumas</font> <font COLOR="#231f20">cepas foram incorretamente classificadas. Dentre essas cepas,</font> <font COLOR="#231f20">aquelas designadas pelo fabricante como <i>Lactobacillus casei</i></font> <font COLOR="#231f20">mostraram ser membros tanto de espécies </font><i><font COLOR="#231f20">Lactobacillus casei</font></i><font COLOR="#231f20">,</font> <font COLOR="#231f20">como de </font><i><font COLOR="#231f20">Lactobacillus paracasei </font></i><font COLOR="#231f20">ou de <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>rhamnosus</i>.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Dessa forma, apesar da grande importância para a indústria</font> <font COLOR="#231f20">de alimentos, a taxonomia do grupo </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">ainda</font> <font COLOR="#231f20">permanece confusa (2), uma vez que as requisições referentes</font> <font COLOR="#231f20">à nomenclatura das espécies que compõem esse grupo</font> <font COLOR="#231f20">permanecem pendentes pela Comissão Judicial (14,19).</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Emprego de bactérias do grupo </font><i><font COLOR="#231f20">Lactobacillus CASEI </font></i><font COLOR="#231f20">em</font></font></b><font face="Verdana" size="2"> <b><font COLOR="#231f20">alimentos</font></b> </font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">O desenvolvimento de produtos lácteos contendo bactérias</font> <font COLOR="#231f20">probióticas é um foco importante das indústrias de alimentos</font> <font COLOR="#231f20">e, geralmente, a produção de alimentos contendo cepas</font> <font COLOR="#231f20">probióticas específicas com concentrações apropriadas de</font> <font COLOR="#231f20">células viáveis durante a vida de prateleira é um desafio</font> <font COLOR="#231f20">tecnológico (20,21). Vários trabalhos propuseram que a dose</font> <font COLOR="#231f20">mínima diária de culturas probióticas considerada terapêutica</font> <font COLOR="#231f20">corresponde ao consumo de 100 g de produto contendo 6 a 7</font> <font COLOR="#231f20">log ufc/g (22-24).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Shirota, no Japão, por volta de 1930, focou sua pesquisa</font> <font COLOR="#231f20">na seleção de cepas de bactérias intestinais que pudessem</font> <font COLOR="#231f20">sobreviver à passagem através do intestino e no uso dessas</font> <font COLOR="#231f20">cepas para desenvolver leites fermentados para distribuição</font> <font COLOR="#231f20">em sua clínica. Seu primeiro produto contendo <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>casei </i>Shirota (naquela época denominado <i>Lactobacillus</i></font> <font COLOR="#231f20"><i>acidophilus</i>) foi a base para o estabelecimento da Yakult (25).</font> <font COLOR="#231f20">Shortt </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (25) relataram que a cepa <i>Lactobacillus casei</i></font> <font COLOR="#231f20">Shirota era amplamente consumida no Japão, sendo que mais</font> <font COLOR="#231f20">de 10% da população consumia produtos contendo esse</font> <font COLOR="#231f20">microrganismo nos anos 1970.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Em meio aos vários tipos de produtos alimentícios, os</font> <font COLOR="#231f20">iogurtes ou produtos similares têm sido utilizados como</font> <font COLOR="#231f20">veículos mais populares para a incorporação de</font> <font COLOR="#231f20">microrganismos probióticos (26). A aplicação de bactérias do</font> <font COLOR="#231f20">grupo </font><i><font COLOR="#231f20">Lactobacillus casei </font></i><font COLOR="#231f20">em novos tipos de iogurtes tem</font> <font COLOR="#231f20">aumentado progressivamente (18).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Kristo </font><i><font COLOR="#231f20">et al</font></i><font COLOR="#231f20">. (26) modelaram e avaliaram os efeitos</font> <font COLOR="#231f20">simultâneos da temperatura de fermentação (TF), teor de</font> <font COLOR="#231f20">sólidos totais do leite (TS) e a quantidade total de inóculo</font> <font COLOR="#231f20">(TI) sobre as propriedades reológicas, a cinética de acidificação</font> <font COLOR="#231f20">e a multiplicação microbiana em leite fermentado contendo a</font> <font COLOR="#231f20">cepa probiótica de </font><i><font COLOR="#231f20">Lactobacillus paracasei </font></i><font COLOR="#231f20">subsp. <i>paracasei</i></font> <font COLOR="#231f20">B117 em co-cultura com </font><i><font COLOR="#231f20">Streptococcus thermophilus </font></i><font COLOR="#231f20">Y4.10 e</font> <i><font COLOR="#231f20">Lactobacillus bulgaricus </font></i><font COLOR="#231f20">Y6.15. Os autores avaliaram, ainda,</font> <font COLOR="#231f20">a viabilidade desses microrganismos, o perfil de ácidos</font> <font COLOR="#231f20">orgânicos e a aceitabilidade sensorial do produto. <i>Lactobacillus</i></font> <font COLOR="#231f20">paracasei mostrou boa sobrevivência em todos os testes</font> <font COLOR="#231f20">durante os 21 dias de armazenamento a 4oC, sempre superiores</font> <font COLOR="#231f20">a 6 log ufc/ml, mostrando boa compatibilidade com os</font> <font COLOR="#231f20">microrganismos starter. Após 7 dias de armazenamento, os</font> <font COLOR="#231f20">produtos probióticos apresentaram maior teor de ácidos lático,</font> <font COLOR="#231f20">pirúvico e orótico, quando comparados ao produto controle,</font> <font COLOR="#231f20">porém sem resultar em diferenças significativas nas análises</font> <font COLOR="#231f20">sensoriais após 2 e 7 dias de armazenamento. Não houve</font> <font COLOR="#231f20">contribuição do TI na taxa máxima de acidificação do produto</font> <font COLOR="#231f20">e a sua firmeza (aumento de G’ e redução da tangente d) foi</font> <font COLOR="#231f20">afetada pela diminuição de TF e aumento de TS. A</font> <font COLOR="#231f20">multiplicação de Lactobacillus paracasei e Streptococcus</font> <font COLOR="#231f20">thermophilus também foi afetada pela redução de TF. Assim,</font> <font COLOR="#231f20">os autores concluíram que através da aplicação de condições</font> <font COLOR="#231f20">apropriadas de fermentação, a cepa Lactobacillus paracasei</font> <font COLOR="#231f20">B117 pode ser usada com sucesso para a produção de leitefermentado com propriedades probióticas, em conjunto com</font> <font COLOR="#231f20">culturas tradicionais.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Em complementação aos iogurtes e leites fermentados, os</font> <font COLOR="#231f20">queijos podem ser uma alternativa como veículo para a</font> <font COLOR="#231f20">administração de bactérias probióticas viáveis em número</font> <font COLOR="#231f20">suficiente para promover benefícios à saúde (9,27,28). Culturas</font> <font COLOR="#231f20">contendo cepas probióticas também têm sido utilizadas para a</font> <font COLOR="#231f20">melhoria de aroma e sabor desses produtos (28-30).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A melhoria das características sensoriais de queijos Arzúa-</font> <font COLOR="#231f20">Ulloa foi obtida por Menéndez et al. (31), que utilizaram uma</font> <font COLOR="#231f20">de cinco cepas diferentes de Lactobacillus – Lactobacillus</font> <font COLOR="#231f20">casei subsp. casei, Lactobacillus plantarum, Lactobacillus</font> <font COLOR="#231f20">casei subsp. pseudoplantarum (duas cepas), Lactobacillus</font> <font COLOR="#231f20">casei (cepa comercial) – em complementação à cultura starter</font> <font COLOR="#231f20">composta de Lactococcus lactis subsp. lactis e Lactococcus</font> <font COLOR="#231f20">lactis subsp. lactis var. diacetylactis. Naquele estudo, a adição</font> <font COLOR="#231f20">das cepas probióticas ao queijo resultou em uma redução do</font> <font COLOR="#231f20">sabor amargo quando comparado ao queijo controle.</font></font></p>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Por outro lado, Buriti et al. (28) não verificaram alterações</font> <font COLOR="#231f20">nas características sensoriais (após 7 dias de armazenamento</font> <font COLOR="#231f20">a 5oC) e de textura (durante 21 dias de armazenamento a 5oC)</font> <font COLOR="#231f20">de queijos Minas frescal produzidos com Lactobacillus</font> <font COLOR="#231f20">paracasei LBC 82, quando comparados aos queijos controles.</font> <font COLOR="#231f20">Naquele estudo, o microrganismo probiótico apresentou</font> <font COLOR="#231f20">aumento da viabilidade nos queijos durante todo o</font> <font COLOR="#231f20">armazenamento, com contagens próximas de 7, entre 7 e 8,</font> <font COLOR="#231f20">próximas de 8 e entre 8 e 9 log ufc/g após, respectivamente, 1,</font> <font COLOR="#231f20">7, 14 e 21 dias.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Vinderola et al. (32) estudaram o emprego de cepas de</font> <font COLOR="#231f20">Lactobacillus casei combinadas somente com bifidobactérias</font> <font COLOR="#231f20">ou com Lactobacillus acidophilus e bifidobactérias, em queijo</font> <font COLOR="#231f20">fresco argentino. As combinações de Lactobacillus casei e</font> <font COLOR="#231f20">bifidobactérias resultaram em uma sobrevivência satisfatória</font> <font COLOR="#231f20">desses microrganismos no queijo, com populações superiores</font> <font COLOR="#231f20">a 6 log ufc/g durante 60 dias de armazenamento, sem redução</font> <font COLOR="#231f20">da viabilidade de Lactobacillus casei, porém com redução da</font> <font COLOR="#231f20">viabilidade de bifidobactérias. A adição de Lactobacillus casei,</font> <font COLOR="#231f20">juntamente com Lactobacillus acidophilus e bifidobactérias,</font> <font COLOR="#231f20">resultou em um queijo com elevadas populações desses três</font> <font COLOR="#231f20">microrganismos (superiores a 7 log ufc/g durante todo o</font> <font COLOR="#231f20">armazenamento, exceto para uma cepa de Lactobacillus</font> <font COLOR="#231f20">acidophilus aos 60 dias).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Em estudo realizado por Gardiner et al. (33), foram</font> <font COLOR="#231f20">empregados Lactobacillus salivarius e Lactobacillus</font> <font COLOR="#231f20">paracasei, isolados de intestino delgado humano, para a</font> <font COLOR="#231f20">fabricação de queijo Cheddar, no qual a espécie Lactobacillus</font> <font COLOR="#231f20">paracasei apresentou multiplicação e manutenção de alta</font> <font COLOR="#231f20">viabilidade durante a maturação, enquanto que as populações</font> <font COLOR="#231f20">de Lactobacillus salivarius diminuíram durante o mesmo</font> <font COLOR="#231f20">período; dessa forma os autores sugeriram que o queijo</font> <font COLOR="#231f20">Cheddar poderia ser efetivo para veicular microrganismos</font> <font COLOR="#231f20">probióticos ao consumidor.</font> </font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Sobremesas aeradas tipo musse também tem mostrado um</font> <font COLOR="#231f20">grande potencial de mercado para consumidores interessados</font> <font COLOR="#231f20">em alimentos mais saudáveis e funcionais (34,35). Aragon-</font> <font COLOR="#231f20">Alegro et al. (36) estudaram a viabilidade de Lactobacillusparacasei LBC 82 em musses de chocolate potencialmenteprobióticas e simbióticas fabricadas, respectivamente, sem e</font> <font COLOR="#231f20">com a adição do prebiótico inulina. Naquele estudo as</font> <font COLOR="#231f20">populações de Lactobacillus paracasei foram sempresuperiores a 7 log ufc/g durante 28 dias de armazenamento,</font> <font COLOR="#231f20">tanto nas musses probióticas como nas simbióticas.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Embora os produtos lácteos fermentados constituam uma</font> <font COLOR="#231f20">fração substancial do mercado de prebióticos e probióticos, o</font> <font COLOR="#231f20">número de produtos não lácteos é crescente, particularmente</font> <font COLOR="#231f20">aqueles à base de soja (5,37,38). Nesse sentido, Heenan et al.</font> <font COLOR="#231f20">(39) avaliaram a sobrevivência de microrganismos probióticos</font> <font COLOR="#231f20">e as populações de células resistentes à bile em sobremesa nãofermentada</font> <font COLOR="#231f20">congelada, à base de soja, adicionada de</font> <font COLOR="#231f20">Lactobacillus paracasei subsp. paracasei Lp-01, Lactobacillus</font> <font COLOR="#231f20">acidophilus MJLA-1, Lactobacillus rhamnosus 100-C,</font> <font COLOR="#231f20">Bifidobacterium lactis BDBB2, Bifidobacterium lactis Bb-12</font> <font COLOR="#231f20">(atualmente reclassificada como Bifidobacterium animalis) ou</font> <font COLOR="#231f20">Saccharomyces boulardii 74012. Naquele estudo, todos os</font> <font COLOR="#231f20">microrganismos probióticos testados mantiveram populações</font> <font COLOR="#231f20">superiores a 6 log ufc/g de produto durante 6 meses de</font> <font COLOR="#231f20">armazenamento, com exceção da cepa de Saccharomyces</font> <font COLOR="#231f20">boulardii. Por outro lado, a cepa de Lactobacillus paracasei</font> <font COLOR="#231f20">estudada apresentou o maior número de células sensíveis à bile</font> <font COLOR="#231f20">(44 % da contagem total) em relação aos demais probióticos.</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">Cepas do grupo Lactobacillus casei como bioconservantes</font></b><font face="Verdana" size="2"> </font><b><font COLOR="#231f20" face="Verdana" size="2">em alimentos</font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Dentre as várias características associadas às bactérias</font> <font COLOR="#231f20">láticas, particularmente ao grupo Lactobacillus casei, destacase,</font> <font COLOR="#231f20">também, o fato delas possuírem atividade antimicrobiana</font> <font COLOR="#231f20">contra microrganismos patógenos, contaminantes e</font> <font COLOR="#231f20">deteriorantes em alimentos (40-42).</font> </font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Buriti et al. (41) verificaram que Lactobacillus paracasei</font> <font COLOR="#231f20">em co-cultura com Streptococcus thermophilus contribuíram</font> <font COLOR="#231f20">para a bioconservação de queijos frescos cremosos probióticos</font> <font COLOR="#231f20">e simbióticos, tendo sido efetivos na inibição de contaminantes,</font> <font COLOR="#231f20">incluindo coliformes totais, Staphylococcus spp. e</font> <font COLOR="#231f20">Staphylococcus DNAse positivos, o que não foi observado</font> <font COLOR="#231f20">para os queijos que não continham Lactobacillus paracasei.</font> <font COLOR="#231f20">No mesmo estudo, os autores descartaram a produção de</font> <font COLOR="#231f20">bacteriocina por Lactobacillus paracasei; a inibição</font> <font COLOR="#231f20">possivelmente ocorreu pela produção de diferentes ácidos por</font> <font COLOR="#231f20">Lactobacillus paracasei e Streptococcus thermophilus.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Similarmente, Calderón et al. (42) observaram diminuição</font> <font COLOR="#231f20">da população de Staphylococcus aureus e de Listeria</font> <font COLOR="#231f20">monocytogenes, em níveis não detectáveis, após 12 dias de</font> <font COLOR="#231f20">armazenamento de iogurtes contendo Lactobacillus casei CRL</font> <font COLOR="#231f20">431 e Lactobacillus acidophilus CRL 730 em co-cultura,</font> <font COLOR="#231f20">adicionados ou não de Lactobacillus rhamnosus LR 35. No</font> <font COLOR="#231f20">mesmo estudo, a redução da população de Escherichia coli</font> <font COLOR="#231f20">O157:H7, em níveis não detectáveis, ocorreu já aos 8 dias de</font> <font COLOR="#231f20">armazenamento daqueles produtos. Nos iogurtes isentos de</font> <font COLOR="#231f20">probióticos, a completa ausência de patógenos somente foi</font> <font COLOR="#231f20">observada após 20 dias de armazenamento.</font> <font COLOR="#231f20">Em outro estudo também realizado com as cepas</font> <font COLOR="#231f20">Lactobacillus casei CRL 431 e Lactobacillus acidophilus CRL</font> <font COLOR="#231f20">730, em co-cultura, em iogurtes contaminados com</font> <font COLOR="#231f20">Staphylococcus aureus na concentração inicial de 108 ufc/g,</font> <font COLOR="#231f20">Salvatierra et al. (43) observaram uma queda da população</font> <font COLOR="#231f20">desse contaminante para níveis não detectáveis após 7 dias de</font> <font COLOR="#231f20">armazenamento. Nos iogurtes ausentes de probióticos, a</font> <font COLOR="#231f20">população de Staphylococcus aureus ainda se manteve</font> <font COLOR="#231f20">superior a 103 ufc/g aos 28 dias de armazenamento.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Outros diversos estudos, nos quais as bactérias Lactobacillus</font> <font COLOR="#231f20">casei/ paracasei utilizadas individualmente ou em co-cultura</font> <font COLOR="#231f20">com outras bactérias láticas inibiram a multiplicação de</font> <font COLOR="#231f20">microrganismos patogênicos e deteriorantes, incluem coliformes</font> <font COLOR="#231f20">(44-46), Staphylococcus aureus (44,46,47), Listeria</font> <font COLOR="#231f20">monocytogenes (45,46), Salmonella (46), e Candida spp.,</font> <font COLOR="#231f20">Zygosaccharomyces bailii e Penicillium sp. (40).</font></font></p> <b>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Beneficios à saúde atribuídos às cepas do grupo</font></font></b><font face="Verdana" size="2"> </font><b><font COLOR="#231f20" face="Verdana" size="2">Lactobacillus casei</font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Várias funções benéficas ao organismo humano têm sido</font> <font COLOR="#231f20">atribuídas ao consumo regular de produtos contendo bactérias</font> <font COLOR="#231f20">probióticas e diversos trabalhos foram conduzidos a fim de</font> <font COLOR="#231f20">melhor caracterizar os efeitos clínicos e fisiológicos de cepas</font> <font COLOR="#231f20">pertencentes ao grupo Lactobacillus casei.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Dentre os microrganismos mais estudados como probióticos</font> <font COLOR="#231f20">destaca-se a cepa Lactobacillus casei Shirota (&quot;ingrediente ativo&quot;</font> <font COLOR="#231f20">do Yakult) (6). Diversos autores citaram que o consumo regular</font> <font COLOR="#231f20">de Yakult tem proporcionado evidências diretas ou indiretas</font> <font COLOR="#231f20">relacionadas à redução do risco de câncer e de bexiga urinária e</font> <font COLOR="#231f20">supressão de câncer cólon-retal (6,25,48).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A aderência de microrganismos probióticos às células</font> <font COLOR="#231f20">epiteliais do intestino e a subseqüente colonização da mucosa</font> <font COLOR="#231f20">são de fundamental importância para a ocorrência dos efeitos</font> <font COLOR="#231f20">benéficos à saúde humana (49,50). Adicionalmente, os</font> <font COLOR="#231f20">probióticos do grupo Lactobacillus casei podem também</font> <font COLOR="#231f20">apresentar efeito protetor contra microrganismos patogênicos</font> <font COLOR="#231f20">e estudos in vitro têm sido utilizados para avaliar tais efeitos</font> <font COLOR="#231f20">(46, 50). Forestier et al. (49), utilizando linhagens de células</font> <font COLOR="#231f20">intestinais Caco-2 em um modelo in vitro, demonstraram que</font> <font COLOR="#231f20">a cepa probiótica de Lactobacillus casei rhamnosus Lcr35 –</font> <font COLOR="#231f20">atualmente reclassificada como uma cepa de Lactobacillus</font> <font COLOR="#231f20">rhamnosus, Collins et al (16) – exibiu propriedades de adesão.</font> <font COLOR="#231f20">Ainda, os autores verificaram que as bactérias patogênicas</font> <font COLOR="#231f20">Escherichia coli enteropatogênica (EPEC), E. coli</font> <font COLOR="#231f20">enterotoxigênica (ETEC), Klebsiella pneumoniae, Shigella</font> <font COLOR="#231f20">flexneri, Salmonella typhimurium, Enterobacter clocae,</font> <font COLOR="#231f20">Pseudomonas aeruginosa, Enterococcus faecalis e</font> <font COLOR="#231f20">Clostridium difficile apresentaram multiplicação reduzida após</font> <font COLOR="#231f20">5 horas de incubação em meio Luria-Bertani ou ágar Columbia</font> <font COLOR="#231f20">suplementado com 5% de sangue de carneiro contendo</font> <font COLOR="#231f20">sobrenadante da cepa probiótica Lcr35 livre de células.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A atividade de diferentes cepas de Lactobacillus spp,</font> <font COLOR="#231f20">isoladas de fezes de recém-nascidos e de crianças com até</font> <font COLOR="#231f20">dois anos de idade, sobre bactérias contaminantes de alimentos</font> <font COLOR="#231f20">ou patógenos foi estudada por Arici et al. (51). Os autores</font> <font COLOR="#231f20">verificaram que 4 cepas de Lactobacillus paracasei (IF8, IF9,</font> <font COLOR="#231f20">IF10 e IF11) exerceram efeito inibitório sobre Staphylococcus</font> <font COLOR="#231f20">aureus ATCC 28213 e 3 cepas (IF8, IF10 e IF11) inibiram a</font> <font COLOR="#231f20">multiplicação de Staphylococcus aureus ATCC 2392, em</font> <font COLOR="#231f20">ensaios de difusão em ágar. A conclusão daquele estudo foi</font> <font COLOR="#231f20">que tais cepas de Lactobacillus paracasei podem contribuir</font> <font COLOR="#231f20">para a manutenção da microbiota intestinal normal daquelas</font> <font COLOR="#231f20">crianças, através do controle da multiplicação de bactérias</font> <font COLOR="#231f20">potencialmente patogênicas à saúde e, dessa forma, prevenir</font> <font COLOR="#231f20">a ocorrência de doenças.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Em complemento, Guérin-Danan et al. (52) avaliaram a</font> <font COLOR="#231f20">influência da suplementação com leite fermentado contendo</font> <font COLOR="#231f20">Lactobacillus casei (referência Danone DN-114 001) pelo</font> <font COLOR="#231f20">período de um mês sobre os índices metabólicos e da</font> <font COLOR="#231f20">microbiota intestinal de crianças saudáveis com idades entre</font> <font COLOR="#231f20">10 e 18 meses. Houve um aumento significativo da</font> <font COLOR="#231f20">percentagem de crianças que apresentaram populações de</font> <font COLOR="#231f20">lactobacilos superiores a 6 log ufc/g nas fezes entre aquelas</font> <font COLOR="#231f20">que receberam leite fermentado com Lactobacillus casei.</font> <font COLOR="#231f20">Paralelamente, a atividade enzimática potencialmente nociva</font> <font COLOR="#231f20">da â-glicuronidase e da â-glicosidase (enzimas envolvidas na</font> <font COLOR="#231f20">circulação enteropática de substâncias tóxicas e</font> <font COLOR="#231f20">carcinogênicas) diminuiu significativamente nessas crianças.</font> <font COLOR="#231f20">Os autores concluíram que tais efeitos representam uma</font> <font COLOR="#231f20">influência saudável de Lactobacillus casei sobre o hospedeiro.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Rochet et al. (53) também verificaram um aumento da</font> <font COLOR="#231f20">população fecal de Lactobacillus casei em adultos saudáveis</font> <font COLOR="#231f20">que consumiram leite fermentado com a cepa DN-114 001,</font> <font COLOR="#231f20">por um período de 10 dias. Sullivan et al. (54) observaram um</font> <font COLOR="#231f20">aumento significativo na população de Lactobacillus paracasei</font> <font COLOR="#231f20">ssp. paracasei F19 e de outros lactobacilos nas fezes de</font> <font COLOR="#231f20">humanos idosos soro-positivos para Helicobacter pylori. Tal</font> <font COLOR="#231f20">efeito significativo ocorreu nos indivíduos que receberam leite</font> <font COLOR="#231f20">fermentado com Lactobacillus paracasei F19, 3,5 × 108 ufc/</font> <font COLOR="#231f20">ml e 2% de inulina, 150 mL duas vezes ao dia por 12 semanas,</font> <font COLOR="#231f20">quando comparado ao grupo controle (que também recebeu</font> <font COLOR="#231f20">leite fermentado pelo mesmo período, mas sem adição de</font> <font COLOR="#231f20">Lactobacillus paracasei F19 e inulina).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Sarker et al. (55) observaram que a cepa Lactobacillus</font> <font COLOR="#231f20">paracasei ST11 auxiliou na melhoria dos sintomas de crianças</font> <font COLOR="#231f20">com diarréia não induzida por rotavirus. O consumo de leite</font> <font COLOR="#231f20">fermentado contendo a cepa Lactobacillus casei DN-114 001</font> <font COLOR="#231f20">também foi relacionado com a redução de episódios de diarréia</font> <font COLOR="#231f20">(53).</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">A modulação de vários parâmetros da imunidade de humanos</font> <font COLOR="#231f20">adultos saudáveis que consumiram 10 g diárias de lingüiça</font> <font COLOR="#231f20">probiótica suplementada com Lactobacillus paracasei LTH 2579</font> <font COLOR="#231f20">durante 5 semanas foi observada por Jahreis et al. (56). Ao final</font> <font COLOR="#231f20">da intervenção naqueles indivíduos, foi verificado um aumento</font> <font COLOR="#231f20">significativo do número de anticorpos contra LDL oxidada.</font> <font COLOR="#231f20">Também foi observado um aumento dos níveis de linfócitos (Thelper)</font> <font COLOR="#231f20">CD4 após 2 semanas de suplementação com</font> <font COLOR="#231f20">Lactobacillus paracasei. Naquele estudo também foi observado</font> <font COLOR="#231f20">um aumento significativo de Lactobacillus paracasei LTH 2579</font> <font COLOR="#231f20">nas amostras fecais de voluntários que consumiram a lingüiçaprobiótica e foi encontrada uma correlação positiva entre a</font> <font COLOR="#231f20">população de Lactobacillus paracasei nas fezes e a percentagem</font> <font COLOR="#231f20">de células expressoras de CD4.</font></font></p>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">Adicionalmente, muitos trabalhos foram conduzidos com</font> <font COLOR="#231f20">animais para também caracterizar os efeitos funcionais in vivo</font> <font COLOR="#231f20">de cepas pertencentes ao grupo Lactobacillus casei. Os efeitos</font> <font COLOR="#231f20">atribuídos a esses microrganismos estão principalmente</font> <font color="#231f20"> relacionados à proteção contra agentes infecciosos peladiminuição da colonização intestinal por patógenos (57),ativação das imunidades local e sistêmica (20, 58), redução</font> <font COLOR="#231f20">dos sinais clínicos de diarréia por rotavírus (59), diminuição</font> <font COLOR="#231f20">dos níveis de triglicérides séricos e de colesterol (60), redução</font> <font COLOR="#231f20">da excreção de metano e aumento da concentração cecal dos</font> <font COLOR="#231f20">ácidos graxos de cadeia curta totais, particularmente, acetato,</font> <font COLOR="#231f20">propionato e butirato (61).</font></font></p> <b>     ]]></body>
<body><![CDATA[<p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">CONSIDERAÇÕES FINAIS</font></p>     <p ALIGN="LEFT" style="line-height: 100%"></b><font face="Verdana" size="2"><font COLOR="#231f20">A importância do papel da microbiota intestinal na</font> <font COLOR="#231f20">manutenção da saúde e prevenção de doenças é bastante</font> <font COLOR="#231f20">reconhecida. Distúrbios desse delicado equilíbrio podem gerar</font> <font COLOR="#231f20">outras desordens e facilitar o estabelecimento de doenças. Esses</font> <font COLOR="#231f20">fatos explicam os grandes desafios com respeito à apresentação</font> <font COLOR="#231f20">de evidências científicas que confirmem os reais efeitos</font> <font COLOR="#231f20">funcionais relacionados aos microrganismos probióticos (13).</font> <font COLOR="#231f20">Conforme apresentado neste trabalho, grandes progressos já</font> <font COLOR="#231f20">foram realizados através de estudos in vivo, nos quais os efeitos</font> <font COLOR="#231f20">funcionais de bactérias do grupo Lactobacillus casei puderam</font> <font COLOR="#231f20">ser verificados, embora a reclassificação das espécies</font> <font COLOR="#231f20">pertencentes a esse grupo ainda seja exigida. Nesse sentido, a</font> <font COLOR="#231f20">classificação taxonômica adequada dessas cepas é de extrema</font> <font COLOR="#231f20">importância, principalmente quando esses microrganismos são</font> <font COLOR="#231f20">veiculados em alimentos probióticos. Os estudos com iogurtes,</font> <font COLOR="#231f20">leites fermentados, queijos e outros alimentos mostram a grande</font> <font COLOR="#231f20">preocupação que existe quanto à descrição e caracterização</font> <font COLOR="#231f20">desses produtos. A utilização de diferentes cepas do grupo</font> <font COLOR="#231f20">Lactobacillus casei, em conjunto com os microrganismos</font> <font COLOR="#231f20">tradicionais usados nesses produtos pode resultar ou não em</font> <font COLOR="#231f20">diferença sensorial perceptível pelo consumidor. Em</font> <font COLOR="#231f20">complementação aos efeitos benéficos já comprovados, esses</font> <font COLOR="#231f20">microrganismos ainda podem ser utilizados para conferir aroma,</font> <font COLOR="#231f20">sabor e textura aos produtos alimentícios, além de auxiliarem</font> <font COLOR="#231f20">na bioconservação dos mesmos.</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">AGRADECIMENTOS</font></p> </b>     <p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">As autoras agradecem à Fundação de Amparo à Pesquisa</font> <font COLOR="#231f20">do Estado de São Paulo pelas bolsas e auxílio financeiro</font> <font COLOR="#231f20">(Processos 02/11294-0, 04/13597-6 e 05/51317-8).</font></font></p> <b>     <p ALIGN="LEFT" style="line-height: 100%"><font COLOR="#231f20" face="Verdana" size="2">REFERÊNCIAS</font></p> </b>     <!-- ref --><p ALIGN="LEFT" style="line-height: 100%"><font face="Verdana" size="2"><font COLOR="#231f20">1. 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<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ferrero]]></surname>
<given-names><![CDATA[M]]></given-names>
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<given-names><![CDATA[M]]></given-names>
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<article-title xml:lang="en"><![CDATA[Molecular characterization of Lactobacillus casei strains]]></article-title>
<source><![CDATA[FEMS Microbiol Lett.]]></source>
<year>1996</year>
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