玉米须中不同极性黄酮类化合物的抗氧化活性比较

通过比较玉米须中不同极性的黄酮类化合物对羟基自由基生成体系以及对Fe^2＋诱发脂蛋白多不饱和脂肪酸（PUFA）过氧化体系的抑制作用，研究了不同极性黄酮类化合物的抗氧化活性（AOA）。结果表明不同极性的黄酮类化合物的抗氧化活性有较大差别。在羟基自由基生成体系中，抗氧化活性顺序依次为氯仿〉正丁醇〉乙酸乙酯。而在Fe^2＋诱发脂蛋白PUFA过氧化体系中，抗氧化活性顺序依次为氯仿〉乙酸乙酯〉正丁醇，严格按照极性由小到大的顺序排列。同时发现，即使极性相同的黄酮类化合物，在不同抗氧化体系中，其抗氧化活性也有着明显的差别。

Studies on Anti-oxidative Activity of Different Polarity Flavonoids from Corn Silk

This paper studied the anti-oxidative activity(AOA) of flavonoids with different polarity in corn silk.Through comparing their inhibition of the hydroxyl free radical production system with the peroxidation-system of polyunsaturated fatty acids(PUFA) in lipoprotein that is induced by Fe~(2 ),the results showed that the AOA in the flavonoids with different polarity changes greatly.The AOA order is successively: Chloroform >Straight cube alcohol>Acetic ether in the system of the free radical of hydroxyl.But in the system of PUFA,the AOA order is successive: Chloroform>Acetic ether> straight cube alcohol,which are arranged from small to the great order according to polarity strictly.And the AOA also changes obviously in different anti-oxidant systems,even if the flavonoids are with the same polarity.It has significant importance to the application of natural antioxidant in food processing.