The polyphenol distribution in fresh waxy corns of different color varieties and their functional activities, which may be useful for treating various chronic diseases, were investigated. The in vitro antioxidant activity, and hypoglycemic and hypocholesterolemic effects of the free and bound corn phenolics were determined to evaluate the edible value of fresh waxy corn. The colored varieties contained more phenols than the common varieties (white and/or yellow). The total free phenolic acid content of the six varieties was 6637.73 µg/g DW (dry weight), which was slightly higher (P > 0.05) than that of the total bound form (6276.65 µg/g DW). The total free flavonoid content was 5850.09 µg/g DW, which was higher (P < 0.05) than that of the total bound form (4874.51µg/g DW). No bound anthocyanin was detected in the methanol extracts of the tested varieties. For all the varieties, free polyphenols contributed 86−100 % and 70−78 % of the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and hydroxyl radical scavenging abilities, respectively, and 100 % of the ferric reducing capacity. The free phenolics in fresh waxy corn showed better (P < 0.05) hypoglycemic effect than the bound form in terms of inhibition of α-amylase activity, whereas the bound phenolics of most varieties showed higher α-glucosidase inhibitory activity than the free forms. The free phenolics showed better (P < 0.05) glycocholesterol binding than the bound form for all varieties. The bound polyphenols showed better sodium cholate and taurocholate binding than the free form for most varieties. In conclusion, the difference between free and bound polyphenol content and functional activities indicates that fresh waxy corn can be potentially used for the development of functional food.

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不同品种新鲜糯玉米的酚类及相关的体外功能活性：全谷物

研究了不同颜色品种的新鲜糯玉米中多酚的分布及其功能活性，这对治疗各种慢性疾病可能有用。测定了游离和结合的玉米酚类化合物的体外抗氧化活性以及降血糖和降胆固醇的作用，以评估新鲜糯玉米的食用价值。有色品种比普通品种（白色和/或黄色）含有更多的酚。六个品种的总游离酚酸含量为6637.73 µg / g DW（干重），比总结合形式（6276.65 µg / g DW）略高（P> 0.05）。总游离类黄酮含量为5850.09 µg / g DW，高于总结合形式（4874.51µg / g DW）（P <0.05）。在测试品种的甲醇提取物中未检测到结合的花色苷。对于所有品种，游离多酚分别占2,2-二苯基-1-吡啶并肼基（DPPH）和羟基自由基清除能力的86-100％和70-78％，以及三价铁还原能力的100％。就α-淀粉酶活性的抑制而言，新鲜蜡质玉米中的游离酚显示出比结合形式更好的降血糖作用（P <0.05），而大多数品种的结合酚显示出比游离形式更高的α-葡萄糖苷酶抑制活性。游离酚类化合物显示出比所有品种的结合形式更好的（P <0.05）糖胆固醇结合。对于大多数品种，结合的多酚表现出比游离形式更好的胆酸钠和牛磺胆酸钠结合性。综上所述，