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In vitro digestibility and physicochemical properties of milled rice

Author:
Dhital, Sushil   Dabit, Laura   Zhang, Bin   Flanagan, Bernadine   Shrestha, Ashok K.  


Journal:
Food Chemistry


Issue Date:
2015


Abstract(summary):

Highlights

In vitro starch digestibility of raw and cooked rice differ significantly.

Rice architecture and non-starch components lower the rice starch digestibility.

Starch digestion is prone to swelling, pasting, gelatinisation and amylose content.

Parboiling process renders the rice highly digestible.

Abstract

Rice is a staple diet as well as a major ingredient in many processed foods. The physicochemical and supra-molecular structure of eight rice varieties with amylose content from 9% to 19% were studied to elucidate the factors responsible for variation in enzymatic digestibility of raw and cooked rice. Parboiled rice had a digestion rate coefficient almost 4.5 times higher than the least digestible Low GI rice. The rate coefficient was found to be independent of helical structure and long range molecular order, possibly attributed to the effect of rice flour architecture. Strong swelling and pasting behaviour and lower gelatinisation temperature were linked with apparently higher in vitro digestibility but the relationship was statistically insignificant. It is concluded that the enzymatic susceptibility of rice flours are independent of supra-molecular structure and are most likely controlled by external factors not limited to particle size, presence of intact cell wall and other non-starch polymers.



Page:
757-765


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