FLOW-INJECTION DETERMINATION OF METHIONINE WITH AMPEROMETRIC DETECTION AT A STABLE MODIFIED ELECTRODE

被引：24

作者：

COX, JA

DABEKZLOTORZYNSKA, E

机构：

[1] Department of Chemistry, Miami University, Oxford, Ohio

来源：

ELECTROANALYSIS | 1991年 / 3卷 / 03期

关键词：

D O I：

10.1002/elan.1140030317

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A glassy carbon electrode that is modified by electrodeposition of a film comprising mixed valence ruthenium oxide stabilized by cyano crosslinks catalyzes the oxidation of methionine at 0.92 V vs. Ag/AgCl. A linear calibration curve is obtained for flow injection amperometry over the range 0.6-180-mu-M with a 0.2 M K2SO4 carrier at pH 2, a 7.5-mu-L sample volume, and a 1.0 mL/min flow rate. The sensitivity is 20 +/- 0.3 nA/mu-M at a 0.07 cm2 electrode. With a single surface preparation, the sensitivity of the method remains constant over more than 3 weeks with daily use. The method also was used with carriers of the composition of common liquid chromatographic eluents such as various citrate-phosphate mixtures and a 0.1 M chloroacetic acid solution at pH 3.0 in 1% acetonitrile.

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页码：239 / 242

页数：4

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