...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Electroanalysis >Voltammetric studies of cadmium- and zinc-containing metallothioneins at Nafion-coated mercury thin film electrodes
【24h】

Voltammetric studies of cadmium- and zinc-containing metallothioneins at Nafion-coated mercury thin film electrodes

机译：Nafion涂层汞薄膜电极上含镉和锌的金属硫蛋白的伏安研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Voltammetric studies of rabbit liver metallothioneins (MTs, containing both Zn and Cd ions) and Zn-7-MT were carried out at Nafion-coated mercury film electrodes (NCMFEs). The accumulation of MT molecules into the NCMFEs enhances the voltammetric signals and the electrostatic interaction between the Nafion membrane and MT facilitates facile electron transfer reactions. Two well-defined redox waves, with reduction potential (E-pc) values at - 0.740 and - 1.173 V, respectively, were observed. The peak at E-pc = -0.740 V is attributable to the reduction of the Cd-MT complex, whereas that at E-pc = - 1.173 V was assigned to the reduction of the Zn-MT complex. Zn-7-MT exhibits only one redox wave with E-pc = - 1.198 V. The NCMFE was found to be more advantageous than thin mercury film electrode (MFE), because the pristine metal ions in MTs (e.g., Cd2+ and/or Zn2+) are not significantly replaced by Hg2+. The NCMFE is also complementary to Nafion-coated bismuth film electrode in that it has a greater hydrogen overpotential, which allows the reduction of the Zn-MT complex to be clearly observed. Moreover, intermetallic compound formation between Cd and Zn appears to be less serious at NCMFEs. Consequently, the amounts of Cd and Zn deposited into the electrode upon the reduction reactions can be quantified more accurately.
机译：在涂有Nafion的水银膜电极（NCMFE）上进行了兔肝金属硫蛋白（MTs，同时含有锌和Cd离子）和Zn-7-MT的伏安研究。 MT分子向NCMFEs中的积累增强了伏安信号，Nafion膜与MT之间的静电相互作用促进了便捷的电子转移反应。观察到两个明确定义的氧化还原波，还原电位（E-pc）值分别为-0.740和-1.173V。 E-pc = -0.740 V处的峰可归因于Cd-MT络合物的还原，而E-pc =-1.173 V处的峰可归因于Zn-MT络合物的还原。 Zn-7-MT仅表现出一个E-pc =-1.198 V的氧化还原波。发现NCMFE比汞薄膜电极（MFE）更具优势，因为MT中的原始金属离子（例如Cd2 +和/或Zn2 +）不能被Hg2 +明显替代。 NCMFE还与Nafion涂层的铋膜电极互补，因为它具有更大的氢超电势，从而可以清楚地观察到Zn-MT复合物的还原。此外，在NCMFE处，Cd和Zn之间的金属间化合物形成似乎不太严重。因此，可以更准确地定量还原反应时沉积在电极中的Cd和Zn的量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号