微量营养素与抗氧化防御作用

现代医学证明，机体和氧进行正常交换时产生的自由基，能损伤蛋白质、核酸等生物大分子，改变细胞结构与功能，从而影响人体健康、引发疾病、甚至危及生命。微量营养素中的维生素E、维生素C、β-胡萝卜素等维生素和某些抗氧化酶依赖的硒、锌、铜等元素，是生物体内抗氧化防御系统的组成成分，可直接或间接地清除活性氧或阻断连锁氧化反应，保护细胞及生物大分子免受氧化损伤。因此，它们在抗氧化防御系统中具有重要的作用，合理摄入这些微量营养素，对预防动脉硬化、抗癌、改善免疫功能及延缓衰老等有着特殊的意义。

Micronutrients and Their Anti-Oxidant Effect

Studies of modem medicines proved that the normal metabolism of oxygen - requiring nutrients could produce free radicals, which can damage the biological macro - molecules and change the structure and fimctions of cells, affecting the health of haman body, and resulting in diseases and even threatening life. A lot of experiments demonstrated that micronutrients were the essential part of anti - oxidant system of organisms. Among miernutrients, Vitamins E, C and Beta- carotene are important anti-oxidant agents, and Selenlium, Zinc, Copper are active factors, some anti - oxidases depend. Are directly or indirectly involved in the clearance of active oxygen and blackage of some chain oxidative reactions, protection of cell membrane and other biological macro - molecules damaged by active oxygen molecules, maintaining the normal structure and ftmctions of cells. Their anti - oxidant effects can work together, promote and protect one another to form an organic protection system. Reasonable intake of these nutrients with the micronutrients can prevent arteriosclerosis and cancer and delay aging process.