Resumo

MARQUES RIBEIRO, Keila; CAMPANA PEREIRA, Lucas; HOCH BATISTA DE SOUZA, Cínthia  e  ISAY SAAD, Susana Marta. Comportamento de cepas distintas de Lactobacillus acidophilus em queijo petit-suisse. ALAN [online]. 2012, vol.62, n.4, pp.347-354. ISSN 0004-0622.

Particular behavior of different Lactobacillus acidophilus strains in petit-suisse cheese. The objective of this study was to evaluate the physico-chemical andmicrobiological characteristics of petit-suisse cheeses manufactured with the addition of two Lactobacillus acidophilus strains:  LA-14  (potentially  probiotic)  and  La-5 (probiotic  culture),  using  Streptococcus  thermophilus TA040 as starter culture. Three cheese-making trials were prepared: Q1 (control: with TA040), Q2 (with TA040 + LA-14), and Q3 (with TA040 + La-5). Parameters analyzed included microbial counts of probiotic, potentially probiotic and starter microorganisms, and physico-chemical parameters (pH and moisture) after 1, 7, 14, 21, and 28 days of storage  of  the  product  at  4±1°C.  Viable  counts  of  L. acidophilus remained between 7.46 and 7.62 log CFU g -1 for La-5, and between 6.39 and 6.83 log CFU g -1 for LA-14. As for the starter, higher populations were observed for Q2 (9.58 - 9.68 log CFU g -1 ) and Q3 (9.42 - 9.79 log CFU g -1 ), when compared to Q1, which suggests synergism between L. acidophilus and the starter culture. Moisture and pH values remained stable for cheeses Q1, Q2, and Q3, and no significant differences were detected between cheeses after the first day of storage (p>0.05). Particular features of both L. acidophilus strains determined different behavior in petit-suisse cheese, and the better adaptation of the La-5 to the product environment was perceptible, since higher populations were observed when compared to LA-14.

Palavras-chave : Petit-suisse cheese; Lactobacillus acidophilus; Streptococcus thermophilus; probiotic; functional food.

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