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肌红蛋白-壳聚糖-金胶纳米复合薄膜修饰电极的电化学性质

秦玉华12, 郭军1, 许慧1, 周力恒1, 许宏鼎2   

  1. 1. 东北电力学院 应用化学系, 吉林省 吉林 132012; 2. 吉林大学 化学学院, 长春 130012
  • 收稿日期:2006-02-06 修回日期:1900-01-01 出版日期:2006-11-26 发布日期:2006-11-26
  • 通讯作者: 秦玉华

Electrochemical Property of Myoglobinchitosancolloid Gold Film Modified Glass Carbon Electrode

QIN Yuhua12, GUO Jun1, XU Hui1, ZHOU Liheng, XU Hongding2   

  1. 1. Department of Applied Chemistry, Northeast China Institute of Electric Power Engineering,  Jilin 132012, Jilin Province, China; 2. College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2006-02-06 Revised:1900-01-01 Online:2006-11-26 Published:2006-11-26
  • Contact: QIN Yuhua

摘要: 在pH=5.4的HAc-NaAc缓冲溶液中, 肌红蛋白-壳聚糖-金胶薄膜修饰电极在-0.20 V(vs. Ag/AgCl) 处有一对准可逆的氧化还原峰, 为Mb血红素辅基Fe(Ⅲ)/Fe(Ⅱ)电对的特征峰. 在壳聚糖金胶纳米复合薄膜的微环境中, 肌红蛋白与玻碳电极之间的电子传递明显加快. 考察了扫速、 溶液pH值及支持电解质浓度等因素对肌红蛋白电子传递的影响. 紫 外光谱结果表明, 肌红蛋白在壳聚糖金胶溶液中依然保持其原始构象, 该肌红蛋白-壳聚糖-金胶纳米复合薄膜修饰电极还可用于溶解氧的催化还原.

关键词: 肌红蛋白, 壳聚糖, 金胶, 电化学, 电催化

Abstract: Myoglobin(Mb)-chitosan-colloidal gold films were made by casting a solution of Mb, chitosan and colloidal gold on glass carbon electrodes. Mb incorporated in chitosancolloidal gold films gave a pair of stable, welldefined, and quasireversible cyclic voltammetric peaks at about -0.20 V(vs.Ag/AgCl) in 0.1 mol/L NaAcHAc buffer (pH=5.4), being the characteristic peaks of the Mb heme Fe(Ⅱ)/Fe(Ⅲ) redox couple. The effects of scan rate, pH and concentration of buffer solutions on the electrochemical behavior of Mb were studied in detail. Position of the Soret absorbance band suggests that Mb in chitosan colloidalgold kept its secondary structure similar to the native states. Oxygen was cata lytically reduced by Mb in chitosancolloidal gold films.

Key words: myoglobin, chitosan, colloidal gold, direct electrochemistry, electrochemical catalysis

中图分类号: 

  • O657.1