Abstract

ROSERO, Olga; MAROUNEK, Milan; BřEňOVA, Natilia  and  LUKEšOVA, Daniela. Phytase activity and comparison of chemical composition, phytic acid P content of four varieties of quinoa grain (Chenopodium quinoa Willd.). Acta Agron. [online]. 2013, vol.62, n.1, pp.13-20. ISSN 0120-2812.

Quinoa (Chenopodium quinoa Willd.), is a plant that has been cultivated in the Andean region of Bolivia, Peru, Ecuador and Colombia. Its importance is due to the high proteins content and essential amino acids of its grain. The aim of this research was to investigate the relations between phytic acid P content and phytase activities of varieties quinoa Nariño-Colombia (QC), quinoa Anapqui's-Bolivia (QBA), quinoa -IICA 020 Oruro-Bolivia (QB) and quinoa Huancavelica-Peru (QP). We found significant differences in the proportions of protein, fat, fibre, and ash among the four varieties. The analysis of essential amino acids showed that these varieties were rich in arginine, leucine, phenylalanine, lysine and valine, and tyrosine a semi essential amino acids. The fat fraction of all varieties contained high concentration of oleic acid, linoleic acid, a-linolenic acid and palmitic acid. The varieties were rich in phosphorus and calcium. The phytic acid P proportion in total P, in the QC (19,64%) was significantly lower than in other three varieties. In the variety QC (1052 FTU/kg) we found high concentration of phytase. A significant negative correlation (r⁼-0.89) was found between the concentration of phytase activity and phytic acid P among the four varieties.

Keywords : Amino acids; Fatty acids; Grain; Phytase; Phytates.

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