Resumen

AGUILAR-GARCIA, Carlos; HEVIA, Patricio  y  NUNEZ, Máryuri. Minerals, Phytic Acid and γ-Oryzanol in whole-grain flour and bran in three cultivars of rice (Oryza Sativa L) in Venezuela. An Venez Nutr [online]. 2014, vol.27, n.2, pp.252-257. ISSN 0798-0752.

The objective of this study was to determine the content of some minerals, phytic acid and γ-oryzanol in whole-grain flour and bran in three cultivars (Cimarrón, Fonaiap 1 y Zeta 15) of rice (Oryza sativa L) in Venezuela. The minerals were (Ca, Mg, Fe y Zn) quantified by Atomic Absorption Spectrophotometry while that the phosphorus (P) and phytic acid were determined using a colorimetric method. The γ-oryzanol was quantified by HPLC. In general, the mineral contents were higher in flour than bran in the cultivar Zeta 15. The P (400,0 ± 5,00 mg/100 g) and Mg (60,0 ± 0,00 mg/100 g) contents were lower in flour of the cultivar Cimarrón, while that were observed higher values of P (1860 ± 2,00 - 2185 ± 0,58 mg/100 g) and Ca (66,7 ± 1,15 - 73,3 ± 1,53 mg/100 g) in the bran of different cultivars. The three cultivars evaluated are an important source of phytic acid and γ-oryzanol; however, the Cimarrón cultivar exhibited the lowest concentrations of these bioactive compounds. Based on these results, whole-grain flours and brans may offer a good source of minerals, phytic acid and γ-oryzanol. The concentrations of all micro compounds evaluated were higher in the brans than the flours, this become the bran an attractive alternative to obtain compounds with biological activity of interest for human health.

Palabras clave : Rice cultivars; whole-grain flours; brans; minerals; phytic acid; y-oryzanol; antioxidants; phytochemicals.

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