Abstract
ABSTRACTThe effects of two doses of gamma radiation (100 and 1,000 krad) upon the stability over a 6‐month storage period of the amino acid composition and protein efficiency ratio (PER) of the macáçar bean Vigna unguiculata (L.) Walp were investigated. No important differences were noted when the aminograms of irradiated and nonirradiated beans, either raw or cooked were compared. Nevertheless, the losses of lysine, arginine and histidine due to cooking were greater in the irradiated beans. The PER of nonirradiated was higher than that of irradiated beans before and after the 6 months of storage, and was always lowest in the beans subjected to the higher dose of radiation. Qualitatively, an association was observed between the nutritional value (PER) and small decreases in the content of certain amino acids which resulted mainly from increased thermal lability of the irradiated bean protein.
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