化学学报 ›› 2001, Vol. 59 ›› Issue (4): 571-577. 上一篇    下一篇

研究论文

抗癌新药染料木素的电化学行为及其应用研究

张秀琦;郑建斌;高鸿   

  1. 西北大学电分析化学研究所
  • 发布日期:2001-04-15

Study on the electrochemical behaviors and its application of a new anticancer medicine—genistein

Zhang Xiuqi;Zheng Jianbin;Gao Hong   

  • Published:2001-04-15

研究了新型抗癌药物染料木素在pH=1~12水溶液中的极谱行为。在不同pH范围内得到了染料木素的四个还原波。研究证实在ph<5的条件下所获得的P1波及5<pH<10介质中获得的P2波为染料木素中性分子的两电子,单质子及其电离形成一价阴离子的两电子,单质子不可逆吸附还原波。在pH<6的条件下所获得的P3波属于染料木素解离形成阴离子的不可逆强吸附前波,而P4波则属于染料木素在碱性介质中解离形成高价阴离子的不可逆吸附还原波。此外通过邻苯三酚自氧化产生活性氧自由基的再还原,对染料木素清除活性氧自由基的能力进行了研究,从电化学的角度对其药理机制进行了阐述。

关键词: 抗癌药, 染料木素, 极谱分析, 还原, 自由基

A detail study of the polarographic reduction of genistein in aqueous medium from pH1 to pH12 is presented. Over the entire pH range, four reduction waves have been achieved. In the alkaline medium, the reactant is strongly absorbed, so that the reaction is of a surface nature. In acidic media, an irreversible reduction process of genistein molecule involving two electrons and one proton takes place. Whereas an irreversible reduction process of anion of genistein involving two electrons and one proton takes place from ph5 to pH10, the reduction is also controlled by the prior protonation reaction of genistein. When pH〉6, there are two irreversible reduction waves corresponding to the reduction of two different anions of genistein, and one of them belongs to adsorption pre-wave. But both of them involve two electrons and one proton. Also, the pure genistein obtained from soybeans was determined by first order derivative polargraphy and it was validated by parallel determination using UV. In particular, its scavenging effecton superoxide anion radical was studied by the auto-oxidation of pyrogallol in HCl-tris buffer (pH=8.2) in order to explain its peculiar biological effects.

Key words: ANTICARCINOGEN, POLAROGRAPHIC ANALYSIS, REDUCTION, FREE RADICALS

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