Methods The MDA, SOD and TAOC were determined and the value of TAOC/ MDA was measured in 60 cases of senile cases and 30 young cases by thiobarbiturates, autoxidation of pyrogallol and Fe 3+/ Fe 2+ chemical methods. 方法分别用硫代巴比妥法、邻苯三酚自氧化法和Fe3+/Fe2+化学法对60例老年人及30例青年人血中MDA、SOD、TAOC进行测定并计算TAOC/MDA比值。