Phenolic antioxidants of foxtail and little millet cultivars and their inhibitory effects on α-amylase and α-glucosidase activities

被引:87
|
作者
Pradeep, P. M. [1 ]
Sreerama, Yadahally N. [1 ]
机构
[1] CSIR, Dept Grain Sci & Technol, Cent Food Technol Res Inst, Mysore 570020, Karnataka, India
关键词
Foxtail millet; Little millet; Cultivars; Phenolic compounds; Antioxidant activity; alpha-Amylase inhibitors; alpha-Glucosidase inhibitors; P-COUMARIC ACID; BOUND PHENOLICS; FRACTIONS; HYPERGLYCEMIA; DERIVATIVES; PROFILES; CAPACITY; IMPACT; GRAINS; WHOLE;
D O I
10.1016/j.foodchem.2017.11.103
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Evaluation of phenolic contents and their in vitro bioactivities of six diverse cultivars of foxtail and little millets revealed that their total phenolic content ranged from 19.42 to 24.12 mu mol ferulic acid equivalents/g. The soluble fraction accounted for more than 80% of the total phenolic and flavonoid contents. Ferulic, caffeic and sinapic acids were the predominant phenolic acids, and luteolin and kaempferol were major flavonoids in the soluble fractions of millets. However, ferulic and p-coumaric acids were abundant in the bound fractions. Millet cultivars exhibited relevant changes in antioxidant activities in different mechanisms. Little millet cultivars showed superior inhibition of alpha-amylase and alpha-glucosidase than foxtail millet cultivars. The soluble and bound fractions of CO7 cultivar of foxtail millet (IC50, 22.37 and 57.26 mu g/ml) and CO4 cultivar of little millet (IC50, 18.97 and 55.69 mu g/ml) displayed strong inhibition towards alpha-glucosidase. These results suggest the potential application of underutilized millets as functional food ingredients for regulating postprandial hyperglycemia.
引用
收藏
页码:46 / 55
页数:10
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