Bioanalytical device based on cholesterol oxidase-bonded SAM-modified electrodes

被引：16
作者：
Parra, A.
Casero, E.
Pariente, F.
Vazquez, L.
Lorenzo, E.
机构：
[1] Univ Autonoma Madrid, Dept Quim Analyt & Anal Instrumental, E-28049 Madrid, Spain
[2] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain
来源：
ANALYTICAL AND BIOANALYTICAL CHEMISTRY | 2007年 / 388卷 / 5-6期
关键词：
cholesterol oxidase biosensor; SAM-modified electrodes; QCM; AFM; SECM; SCANNING ELECTROCHEMICAL MICROSCOPY; AMPEROMETRIC DETERMINATION; BIOSENSOR; SURFACES; DERIVATIVES; ESTERASE; DESIGN; LAYER; FILMS;
D O I：
10.1007/s00216-007-1187-1
中图分类号：
Q5 [生物化学];
学科分类号：
071010 ; 081704 ;
摘要：
A rapid, simple and reproducible two-step method for constructing cholesterol biosensors by covalently bonding cholesterol oxidase (ChOx) to a 3,3'-dithiodipropionic acid di(N-succinimidyl ester) (DTSP)-modified gold electrode is described. Exhaustive characterizations of both the immobilization process and the morphological properties of the resulting ChOx monolayer were performed via a quartz crystal microbalance (QCM) and atomic force microscopy (AFM) operated under liquid conditions, respectively. In addition, scanning electrochemical microscopy (SECM) measurements were performed in order to check that the immobilized enzyme retains its catalytic activity. The replacement of the natural electron acceptor (O-2) in the enzymatic reaction with an artificial mediator, hydroxymethylferrocene (HMF), was also studied. Finally, cholesterol was amperometrically determined by measuring the hydrogen peroxide produced during the enzymatic reaction at +0.5 V. The optimized cholesterol biosensor exhibited a sensitivity of 54 nA mM(-1) and a detection limit of 22 mu M.
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收藏
页码：1059 / 1067
页数：9
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