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Selective Detection of p ‐Phenylenediamine in Hair Dyes Based on a Special CE Mechanism Using MnO 2 Nanowires
Author(s) -
Bai YuHui,
Li JinYi,
Zhu Yuhua,
Xu JingJuan,
Chen HongYuan
Publication year - 2010
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900576
Subject(s) - amperometry , o phenylenediamine , detection limit , p phenylenediamine , chemistry , cyclic voltammetry , electrochemistry , redox , resorcinol , electrode , hydroquinone , catechol , nanowire , electron transfer , nuclear chemistry , inorganic chemistry , photochemistry , materials science , nanotechnology , organic chemistry , chromatography , catalysis
Abstract We report a novel approach for selective determination of p ‐phenylenediamine in hair dyes using β ‐MnO 2 nanowires modified glassy carbon (GC) electrodes through an electrochemical co‐deposition process with chitosan hydrogel. A special CE (chemical reaction and electron transfer) process on the surface of β ‐MnO 2 nanowires modified GC electrode is proposed and proved by cyclic voltammetry and UV‐Vis spectroscopy in the presence of p ‐phenylenediamine. p ‐Phenylenediamine can react with MnO 2 nanowires to produce diimine and the equilibrium of the two‐electron and two‐proton redox process of p ‐phenylenediamine on the electrode is changed, and consequently the reductive current is enhanced significantly. At a constant potential of 0 V vs. SCE, other main components of hair dyes including o ‐, m ‐phenylenediamine, catechol, resorcinol, and p ‐dihydroxybenzene do not interfere in the determination of p ‐phenylenediamine in the amperometric measurement because of their much lower chemical reaction activities with MnO 2 nanowires. It shows a determination range of 0.2–150 μM and a low detection limit of 50 nM to response p ‐phenylenediamine. This modified electrode is successfully used to analyze the amount of p ‐phenylenediamine in hair dyes without preseparation procedures.