Simultaneous determination of total homocysteine, cysteine and methionine in hypothyroid patients’ plasma by liquid chromatography using platinum/poly(methyl violet) modified electrode |
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Authors: | Haihong Xu Wei Zhu Katsunobu Yamamoto |
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Institution: | a Department of Chemistry, East China Normal University, ZhongShan Road North 3663, Shanghai 200062, PR China b Department of Endocrinology and Metabolism, Shanghai Institute for Pediatric Research, Xin-Hua Hospital, Shanghai 200092, PR China c BAS Corporation, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan |
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Abstract: | The fabrication and application of a novel electrochemical detection (ED) system with the platinum/poly(methyl violet) (Pt/MV) chemically modified electrode (CME) for high performance liquid chromatography (HPLC) were described. The Pt particles deposited on the poly-MV film were characterized by atomic force microscope (AFM). It was found that the Pt/MV CME exhibited efficiently electrocatalytic effect on the current responses of cysteine (Cys), homocysteine (Hcy) and methionine (Met) with relatively high sensitivity, stability and long-life of activity. In HPLC-ED, these three amino acids had good and stable current responses at the CME and their linear ranges were over three orders of magnitude (R ≥ 0.9996) with the detection limits being 7.5 × 10−8 mol L−1 for Cys, 1.0 × 10−7 mol L−1 for Hcy, 5.0 × 10−7 mol L−1 for Met. The application of this method coupled with microdialysis sampling for the determination of Cys, Hcy and Met in plasma from patients with hypothyroidism was satisfactory. |
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Keywords: | Pt particles/poly(methyl violet) Cysteine Homocysteine Methionine Hypothyroid |
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