Amperometric L-lactate biosensor based on screen-printed carbon electrode containing cobalt phthalocyanine, coated with lactate oxidase-mesoporous silica conjugate layer

被引:54
|
作者
Shimomura, Takeshi [1 ]
Sumiya, Touru [1 ]
Ono, Masatoshi [1 ]
Ito, Tetsuji [2 ]
Hanaoka, Taka-aki [2 ]
机构
[1] Funai Elect Adv Appl Technol Res Inst Inc FEAT, Tsukuba, Ibaraki 3050047, Japan
[2] Natl Inst Adv Ind Sci & Technol, Miyagino Ku, Sendai, Miyagi 9838551, Japan
基金
日本科学技术振兴机构;
关键词
Screen-printed carbon electrode; Cobalt phthalocyanine; Lactate oxidase; Mesoporous silica; Nafion; Sampling unit; GLUCOSE BIOSENSOR; ENZYME ELECTRODES; HYDROGEN-PEROXIDE; IMMOBILIZATION; DESIGN; MATRIX; SENSORS; STABILIZATION; BIOCOMPOSITE; SYSTEM;
D O I
10.1016/j.aca.2011.11.053
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A novel amperometric biosensor for the measurement of L-lactate has been developed. The device comprises a screen-printed carbon electrode containing cobalt phthalocyanine (CoPC-SPCE), coated with lactate oxidase CLOD) that is immobilized in mesoporous silica (FSM8.0) using a polymer matrix of denatured polyvinyl alcohol; a Nafion layer on the electrode surface acts as a barrier to interferents. The sampling unit attached to the SPCE requires only a small sample volume of 100 mu L for each measurement. The measurement of I.-lactate is based on the signal produced by hydrogen peroxide, the product of the enzymatic reaction. The behavior of the biosensor, LOD-FSM8.0/Naf/CoPC-SPCE, was examined in terms of pH, applied potential, sensitivity and operational range, selectivity, and storage stability. The sensor showed an optimum response at a pH of 7.4 and an applied potential of +450 mV. The determination range and the response time for L-lactate were 18.3 mu M to 1.5 mM and approximately 90 s, respectively. In addition, the sensor exhibited high selectivity for I.-lactate and was quite stable in storage, showing no noticeable change in its initial response after being stored for over 9 months. These results indicate that our method provides a simple, cost-effective, high-performance biosensor for L-lactate. (C) 2011 Elsevier B.V. All rights reserved.
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页码:114 / 120
页数:7
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