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The effect of fermented rice germ extracts on the inhibition of glucose uptake in the gastrointestinal tract in vitro and in vivo

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Abstract

This study aimed to evaluate the effect of fermented rice germ extracts on the inhibition of glucose uptake in the gastrointestinal (GI) tract. Samples were prepared by extracting rice germ fermented with Lactobacillus plantarum with 30% ethanol (RG_30E) or 50% ethanol (RG_50E). Ferulic acid was determined as the active component in the samples. RG_30E significantly inhibited glucose uptake and mRNA expression of GLUT2 and SGLT1 to a larger extent than RG_50E in Caco-2 cells. A single oral administration was performed on C57BL/6 mice to confirm which substrate (glucose, sucrose, or maltose) the sample inhibited absorption of, improving postprandial blood glucose elevation. As a result, RG_30E resulted in significantly lower blood glucose levels and AUC after glucose and sucrose administration. Therefore, fermented rice germ extracted with 30% ethanol regulates glucose uptake through glucose transporters and can be expected to alleviate postprandial hyperglycemia in the GI tract.

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Acknowledgements

This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Agro and Livestock Products Safety·Flow Management Technology Development Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA) (119072-1). We appreciate the Cheongwon Saengmyeong Agricultural Cooperative Federation Rice association corporation for supporting the fermented rice germ extract samples.

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Hyun, Y.J., Park, Sy. & Kim, J.Y. The effect of fermented rice germ extracts on the inhibition of glucose uptake in the gastrointestinal tract in vitro and in vivo. Food Sci Biotechnol 32, 371–379 (2023). https://doi.org/10.1007/s10068-022-01198-6

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