Xu Shengshu, Qin Likang, Mazhar Muhammad, Zhu Yong
School of Liquor and Food Engineering, Guizhou University, Guiyang, China.
College of Life Sciences, Guizhou University, Guiyang, China.
Front Nutr. 2022 Nov 2;9:1044427. doi: 10.3389/fnut.2022.1044427. eCollection 2022.
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 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.
低血糖指数（GI）饮食已被视为II型糖尿病患者的一种策略。在本研究中，对七个品种芸豆的酚类物质概况、α-淀粉酶抑制活性、淀粉组成以及血糖指数进行了研究。采用酶抑制反应模型测定α-淀粉酶抑制活性，并采用消化模型结合3,5-二硝基水杨酸比色法评估淀粉组成和血糖指数。结果表明，没食子酸在芸豆中占主导地位，花芸豆比白芸豆含有更多的酚类物质。此外，芸豆的α-淀粉酶抑制活性范围为1.659±0.050至4.162±0.049 U/g干重，其中Y2品种排名第一。此外，芸豆淀粉表现出很强的抗消化性，抗性淀粉占总淀粉的比例在70.90±0.39%至83.12±0.42%之间。最终，这些芸豆被归类为低GI食物，其GI值范围为32.47±0.13至52.99±0.56，抗性淀粉对低GI起主要作用。这些结果表明，芸豆可作为功能性低GI食物的成分。
