Iron(II) phthalocyanine-modified carbon-paste electrode for potentiometric detection of ascorbic acid

被引:64
作者
Amini, MK [1 ]
Shahrokhian, S [1 ]
Tangestaninejad, S [1 ]
Mirkhani, V [1 ]
机构
[1] Univ Isfahan, Dept Chem, Esfahan 81744, Iran
关键词
iron(II) phthalocyanine; ascorbic acid; modified electrode; potentiometry; electrocatalysis;
D O I
10.1006/abio.2000.4929
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
A chemically modified electrode constructed by incorporating iron(II) phthalocyanine [Fe(II)Pc] into carbon-paste matrix was used as a sensitive potentiometric sensor for detection of ascorbic acid. The resulting electrode exhibits catalytic properties for the electrooxidation of ascorbic acid, and lowers the overpotential for the oxidation of this compound. The faster rate of electron transfer results in a near-Nernstian behavior of the modified electrode, and makes it a suitable potentiometric sensor for detection of ascorbic acid. A linear response in concentration range from 10(-6) to 10(-2) M (0.18-1800 mug ml(-1)) was obtained with a detection limit of 5 x 10(-7) M for the potentiometric detection of ascorbic acid. The modified electrode was used for the determination of ascorbic acid in vitamin preparations. The recovery was 97.2-102.4% for the vitamin added to the preparations with a relative standard deviation of less than 5%. The modified electrode exhibited a fast response time (<10 s), had good stability, and had an extended lifetime. <(c)> 2001 Academic Press.
引用
收藏
页码:277 / 282
页数:6
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