硝酸铈减少OH自由基作用的研究

Study on Cerium Nitrate''''s Effect of Ridding OH Radicals

摘要:

OH自由基属于活性氧自由基，具有强氧化作用，在生物体内可损伤机体。硝酸铈中稀土离子Ce^3 具有变价特性，较容易实现三价与四价之间的转变，并能与OH自由基反应。本研究利用纳米TiO2的光催化作用产生OH自由基，将硝酸铈与TiO2混合，以DMPO作为捕捉剂，用电子自旋共振(ESR)的方法证实了在硝酸铈的作用下，纳米TiO2产生的OH自由基数量大为减少，从而证明硝酸铈可有效清除OH自由基。

Abstract:

OH radical is one of the reactive oxygen species, and is very oxidative. It can injure the body. Rare earth Ce3+ in cerium nitrate can change over between Ce3+ and Ce4+, and can react with OH radicals. In this study OH radicals were produced by nano-TiO2 which can produce OH radicals after irradiated by ultraviolet radiation. Cerium nitrate was mixed with nano-TiO2, then DMPO was employed to catch OH radicals. The result of electron spin resonance(ESR)shows that the quantity of OH radicals produced by nano-TiO2 mixed with cerium nitrate is much less than that without cerium nitrate, thus approves cerium nitrate can effectively rid OH radicals.