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１引言一氧化氮是一种重要的生理活性物质。其化学性质不稳定，在有氧水环境中仅数秒钟就被氧化变成亚硝酸报（ＮＯ２－）。这使得直接测定生物组织中ＮＯ含量变得十分困难。因此，目前一般都是通过测定生物组织中ＮＯ的氧化产物ＮＯ２－来间接地反映ＮＯ含量。然而ＮＯ２－本
1 Introduction Nitric oxide is an important physiologically active substance. Its chemical properties are not stable and oxidize to nitrous acid (NO2-) in only a few seconds in an aerobic environment. This makes it very difficult to directly determine the NO content in biological tissues. Therefore, at present, the NO content is generally indirectly reflected by measuring the NO2- which is an oxidation product of NO in biological tissues. However NO2 - this