Comparative protein digestibility in growing rats of cooked rice and protein properties of indica and japonica milled rices

Abstract

Eight indica and japonica milled rices with low amylose content and low starch gelatinisation temperature were analysed for cooked rice energy and N balance in growing rats and for protein properties. Digestible energy values were similar. Japonica rices Koshihikari and Sasanishiki had higher true digestibility (TD) and net protein utilisation in rats than indica rices IR24 and PR2338315. Similar results were obtained from in vitro proteolysis. High TD of cooked rices was not significantly correlated with low prolamin content in raw rice and with low waxy gene product (protein bound to starch granule) but was significantly correlated with low cysteine content in protein and with low denatured prolamin content in cooked rice. In two pairs of cooked waxy milled rices, which are devoid of waxy gene product, japonica rice still tended to show higher rat TD and in vitro protein digestibility than indica rice, consistent with lower cysteine content in japonica protein.

Source or Periodical Title

Journal of Cereal Science

ISSN

7335210

Page

183-191

Document Type

Article

Subject

Cooked-rice protein digestibility, Cysteine content, Glutelin content, Indica vs. japonica, Prolamin content., Protein content, Protein properties, Waxy gene product

This document is currently not available here.

Share

COinS