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- W2241724658 abstract "Seven Malaysian rice varieties (amylose content ranging from 0.2 to 27%)were subjected to in-vitro digestion with a multi-step process that mimicsdigestion in humans. The rice was cooked, ground and digested and digestatecollected at various times. The kinetics of starch hydrolysis during thedigestion fitted the Michaelis-Menten mechanism. As expected, higher Vmaxvalues were obtained for two waxy samples compared with the rice sampleswith higher amylose contents; however, the Km values did not show anycorrelation to amylose content. These results are consistent with theassumption that amylose chains tending to leach from the granules duringcooking, forming a viscous network that encapsulates the starch granules,making them less accessible to pancreatic alpha-amylase and slowing theenzymic process, resulting in the lower Vmax values. The time evolutions ofthe size distributions of the whole and debranched starch in the undigestedfractions were obtained using multiple detection size-exclusion chromatography(SEC). The starch was extracted using an improved extraction/dissolutiontechnique for complete starch extraction and dissolution without degradation.This gave the size dependences of the weight distribution, number distribution,weight average molecular weight and radius of gyration. Trimodalchromatograms were observed for all digested samples, which consisted ofamylose, amylopectin and intermediate materials (size range 10–20 nm). Thethree peaks persisted until the end of digestion analysis (6 h), only withdecreased amounts over time. This showed that the starch molecules in thecooked rice grains were hydrolyzed in a controlled fashion without muchmolecular size selection. This may be caused by the large size of entities in thesample, which limited the action of digestion enzymes to the sample surfaces." @default.
- W2241724658 created "2016-06-24" @default.
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- W2241724658 date "2010-01-01" @default.
- W2241724658 modified "2023-09-27" @default.
- W2241724658 title "Starch structure – Property relations for digestion of cooked rice" @default.
- W2241724658 hasPublicationYear "2010" @default.
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