Journal
ANALYTICAL CHEMISTRY
Volume 74, Issue 3, Pages 562-569Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac010657i
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2,4,6-Triphenylpyrylium ion immobilized inside the supercages of zeolite Y enhances by 1-2 orders of magnitude the response of electrochemical oxidation of dopamine in neutral aqueous media accompanied by a remarkable inhibition of post-electron-transfer reactions. The negative charge of the zeolite framework in which the 2,4,6-triphenylpyrylium ion is incorporated blocks the electrochemical oxidation of the negative ascorbate ion, enabling the determination of micromolar concentrations of dopamine in the presence of a large excess (10(3)-10(4) times) of ascorbate in phosphate buffer (pH 7.4). Under optimized conditions, linear calibration plots were obtained for a differential pulse detection mode over the range 250-1 muM dopamine with a sensitivity of 62 nA/muM and a detection limit (S/N = 3) of 0.2 muM in the presence of 1.0 mM ascorbate.
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