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A three‐solvent extracting method, which consist of 80% acetone, ethyl acetate, and 70% ethanol extracting procedures, was adopted to evaluate phenolics profile and antioxidant activities of Tartary buckwheat. Phenolics profile of Tartary buckwheat was determined using HPLC. Gallic acid, chlorogenic acid, and 2,3,4‐trihydroxybenzoic acid were detected in 80% acetone extracts, 2,3,4‐trihydroxybenzoic acid was detected in ethyl acetate extracts, rutin and quercetin were detected in 70% ethanol extracts, rutin was the dominant phenolic compound, and the contents ranged from 1,902.0 to 2,402.8 mg/100 g DW. Antioxidant activities of Tartary buckwheat were determined using DPPH, ABTS, and FRAP assays, 70% ethanol extracts showed a higher antioxidant activity than 80% acetone and ethyl acetate, respectively. These results suggested that the three‐solvent extracting method is more comprehensive than independent one in evaluating phenolics profile and antioxidant activities of Tartary buckwheat. Practical applications The three‐solvent extracting method can be used to evaluate functional properties of Tartary buckwheat.

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Adlay, as a traditional Chinese medicine, has been used in nourishing foods, which are rich in a variety of nutrients (special biological compounds). The study was designed to optimize the fermentation parameters of dehulled, polished and broken adlay fermented by Bacillus subtilis BJ3-2 with regard to tetramethylpyrazine (TMP) yield and fibrinolytic enzyme activity. Then the proximate and bioactive components of B. subtilis-fermented adlay were evaluated. Box-Behnken design results showed that the TMP yield was 6.93 mg/g DW (dried weight) of B. subtilis-fermented polished adlay, which was about 136 times higher than that of B. subtilis-fermented soybean (BSB). The fibrinolytic enzyme activity was 2236.17 U/g in B. subtilis-fermented dehulled adlay, and slightlyless than in BSB. B. subtilis-fermented adlay contained higher fat, free amino acids and fatty acids contents but lower protein and starch contents than raw adlay. Except for coixol and coixan, the levels of c-aminobutyric acid, triterpenes, phenolics, flavonoids and coixenolide in B. subtilis-fermented adlay increased by 14.05, 2.02, 2.31 and 1.36 times, respectively. The contents of phenolic acids including caffeic, gallic, catechinic and chlonogenic acids in the free phenolic extracts significantly increased (p \ 0.05). The results demonstrated that the biotransformation of high-yield TMP, fibrinolytic enzyme and other bioactive components of B. subtilis-fermented adlay products was realized. B. subtilis-fermented adlay could be a promising value-added food, and that is more suitable for human consumption.

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Foods contain dietary fibers which can be classified into soluble and insoluble forms. The nutritional composition of fast foods is considered unhealthy because it negatively affects the production of short-chain fatty acids (SCFAs). Dietary fiber is resistant to digestive enzymes in the gut, which modulates the anaerobic intestinal microbiota (AIM) and fabricates SCFAs. Acetate, butyrate, and propionate are dominant in the gut and are generated via Wood–Ljungdahl and acrylate pathways. In pancreatic dysfunction, the release of insulin/glucagon is impaired, leading to hyperglycemia. SCFAs enhance insulin sensitivity or secretion, beta-cell function, leptin release, mitochondrial function, and intestinal gluconeogenesis in human organs, which positively affects type 2 diabetes (T2D). Research models have shown that SCFAs either enhance the release of peptide YY (PYY) and glucagon-like peptide-1 (GLP-1) from L-cells (entero-endocrine), or promotes the release of leptin hormone in adipose tissues through G-protein receptors GPR-41 and GPR-43. Dietary fiber is a component that influences the production of SCFAs by AIM, which may have beneficial effects on T2D. This review focuses on the effectiveness of dietary fiber in producing SCFAs in the colon by the AIM as well as the health-promoting effects on T2D.

Low glycemic index (GI) diet has been considered as a strategy for type II diabetes patients. In the present study, the phenolics profile, α-amylase inhibitor activities, starch composition as well as the glycemic index of seven varieties of kidney beans were studied. An enzymatic inhibitory reaction model was employed to determine the α-amylase inhibitor activity, and the in vitro digestion model coupled with the 3, 5-dinitrosalicylic acid colorimetry method was adopted to evaluate the starch composition and glycemic index. The results showed that gallic acid was dominant in kidney beans, and the colored beans contained more phenolics than the white ones. In addition, the α-amylase inhibitor activities of kidney beans ranged from 1.659 ± 0.050 to 4.162 ± 0.049 U/g DW, among which the Y2 variety was the top-ranked. Furthermore, kidney beans starch demonstrated brilliant resistance to digestion with the contribution of resistant starch to total starch between 70.90 ± 0.39% and 83.12 ± 0.42%. Eventually, these kidney beans were categorized as low GI foods, which ranged from 32.47 ± 0.13 to 52.99 ± 0.56, the resistant starch makes dominant contribution to the low GI. These results indicate that kidney beans can be served as ingredients in functional low GI foods.