十六烷基三甲基溴化铵对甲状腺素电化学测定的影响。
The effect of cetyltrimethyl ammonium bromide on the electrochemical determination of thyroxine.
作者信息
He Qiong, Dang Xueping, Hu Chengguo, Hu Shengshui
机构信息
Department of Chemistry, Wuhan University, Wuhan 430072, China.
出版信息
Colloids Surf B Biointerfaces. 2004 May 15;35(2):93-8. doi: 10.1016/j.colsurfb.2004.03.001.
Electrochemical behavior of thyroxine at a polyvinylpyrrolidone modified carbon paste electrode in the presence of cetyltrimethyl ammonium bromide was described. Thyroxine underwent totally irreversible oxidation at this system and a well-defined peak at 0.42 V was obtained. The influence of various surfactants on the oxidation of thyroxine was examined by cyclic voltammetry. Chronocoulometry was also used to investigate the electrode process. In the range 2 x 10(-7) to 9 x 10(-6)mol/l, the thyroxine concentration was linear with the oxidation peak current and a low detection limit of 8 x 10(-8) mol/l was obtained for 5 min accumulation.
描述了在十六烷基三甲基溴化铵存在下，甲状腺素在聚乙烯吡咯烷酮修饰碳糊电极上的电化学行为。在该体系中甲状腺素发生完全不可逆氧化，并在0.42 V处获得一个清晰的峰。通过循环伏安法研究了各种表面活性剂对甲状腺素氧化的影响。计时库仑法也用于研究电极过程。在2×10⁻⁷至9×10⁻⁶mol/L范围内，甲状腺素浓度与氧化峰电流呈线性关系，5分钟富集时检测限低至8×10⁻⁸mol/L。
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