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dc.titleInhibition Effect of Extract of Psychotria viridiflora Stem on α-Amylase and α-Glucosidase and Its Application in Lowering the Digestibility of Noodles
dc.contributor.authorChen, Qimin
dc.contributor.authorToy, Joanne Yi Hui
dc.contributor.authorSeta, Cynthia
dc.contributor.authorYeo, Tiong Chia
dc.contributor.authorHuang, Dejian
dc.identifier.citationChen, Qimin, Toy, Joanne Yi Hui, Seta, Cynthia, Yeo, Tiong Chia, Huang, Dejian (2021-08-12). Inhibition Effect of Extract of Psychotria viridiflora Stem on α-Amylase and α-Glucosidase and Its Application in Lowering the Digestibility of Noodles. Frontiers in Nutrition 8 : 701114. ScholarBank@NUS Repository.
dc.description.abstractA collection of tropical medicinal plants from East Malaysia's rainforests are used by indigenous tribes for their curative properties. Despite their purported healing properties, these forest plant species are largely unexplored and hence remain virtually unknown to the outside world. In this study, antidiabetic properties of Psychotria viridiflora, a plant used to treat diabetes by a local community in Sarawak, Malaysia were investigated. Ethyl acetate (EA) extract of P. viridiflora stem was found to exhibit high starch hydrolase inhibition activity with an IC50 value of 15.4 ± 2.1 μg/ml against porcine α-amylase and an IC50 value of 32.4 ± 3.7 μg/ml against rat intestinal α-glucosidase. A complex mixture of A-type oligomeric proanthocyanidins containing (epi)fisetinidol, (epi)afzelechin, (epi)guibourtinidol, and (epi)catechin were found. These compounds may be responsible for the starch hydrolase inhibition activity. Ethyl acetate (EA) extract of P. viridiflora stem was incorporated into wheat and rice flour to reformulate noodles with slow digestibility and was assessed under in vitro simulated gastrointestinal conditions. A dose-dependent effect on digestibility was observed for both noodles upon incorporation of 1-6% (w/w) of EA extract, with noodles containing 6% (w/w) extract exhibiting the greatest reduction in digestibility. As compared to rice noodles containing 6% extract (31.16% inhibition), wheat noodles with the same extract concentration had a smaller decline in digestibility (27.25% inhibition) after 180 min. Overall, our findings highlight the potential of P. viridiflora in the prevention of postprandial hyperglycaemia. © Copyright © 2021 Chen, Toy, Seta, Yeo and Huang.
dc.publisherFrontiers Media S.A.
dc.rightsAttribution 4.0 International
dc.sourceScopus OA2021
dc.subjectin vitro study
dc.subjectPsychotria viridiflora
dc.contributor.departmentFOOD SCIENCE & TECHNOLOGY
dc.description.sourcetitleFrontiers in Nutrition
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