A simple method for determination of D-penicillamine on the carbon paste electrode using cupric ions

被引:24
|
作者
Ghaffarinejad, Ali [1 ]
Hashemi, Fatemeh [2 ]
Nodehi, Zahra [3 ]
Salahandish, Razieh [1 ]
机构
[1] Iran Univ Sci & Technol, Fac Chem, Tehran 1684613114, Iran
[2] Islamic Azad Univ, Dept Chem, Firoozabad Branch, Firoozabad, Fars, Iran
[3] Bu Ali Sina Univ, Fac Chem, Dept Phys Chem, Hamadan 65174, Iran
关键词
D-penicillamine; Carbon paste electrode; Cupric ion; Urine sample; ELECTROCATALYTIC OXIDATION; L-CYSTEINE; HYDRAZINE; COPPER; URINE;
D O I
10.1016/j.bioelechem.2014.06.008
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The interaction of D-penicillamine (PA) with copper at the carbon paste electrode (CPE) in the presence of cupric ions (Cu2+) was used for the determination of PA at very low potential (0.1 V vs. Ag/AgCl) without applying of any modifier. The electrochemical response of copper is changed considerably in the presence of negligible amount of PA. In this report some important parameters, such as pH effect, Cu2+ concentration and scan rate are studied, which the selected conditions were acetate buffer (pH = 6) and 1 mM Cu2+. The linear range for PA was from 1.0 x 10(-6) to 1.0 x 10(-4) M with an experimental detection limit of 1.0 x 10(-7) M. The relative standard deviation for 6 measurements was 3.8%. The interfering effects of some important inorganic ions were investigated, which there was no significant effect on the PA measurements. Also three organic interferences including ascorbic acid (AA), uric acid (UA) and i.-cysteine (Cys) were examined, which the effect of AA was not notable, the interference of UA was moderate and for Cys was significant, but moderate at the levels which fined in the urine samples. This method was applied successfully for the determination of PA in urine sample. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:53 / 56
页数:4
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