Bienzyme Electrode Compatible Behavior for Water-Soluble and-Insoluble Substrates
作者:
B. Leca,
R.M. Morélis,
P.R. Coulet,
期刊:
Analytical Letters
(Taylor Available online 1996)
卷期:
Volume 29,
issue 5
页码: 661-672
ISSN:0003-2719
年代: 1996
DOI:10.1080/00032719608001774
出版商: Taylor & Francis Group
关键词: photocrosslinked polymer;direct coating;co-immobilization;bienzyme electrode;water insoluble substrates
数据来源: Taylor
摘要:
A bienzymatic sensing layer containing two enzymes able to work sequentially, choline oxidase (ChOD) and phospholipase D (PLaseD), was used to design an electrochemical biosensor for the detection of either a water-soluble (choline) or insoluble (phosphatidylcholine) substrate. A photocrosslinkable polymer, poly(vinyl alcohol) bearing styrylpyridinium groups (PVA-SbQ), was used as host-matrix for enzyme immobilization. Controlled amounts of PVA-SbQ and of the two enzymes were directly coated on a platinum disk, then photopolymerized. The compatibility of working conditions for choline and phosphatidylcholine detection in the presence of Triton X-100 and CaCl2was investigated. The effect of the activity ratio PLaseD / ChOD on the sensor performance was determined. The sensitivities to choline and to phosphatidylcholine were 18 mA.1mol−1and 0.66 mA.1.mol−1respectively, the detection limit being 1.5.10−8M for choline and 1.5.10−6M for phosphatidylcholine. The linear range extended up toca. 10−4M for choline andca. 2.10−5M for phosphatidylcholine and the response time was close to 30 seconds for choline andca. 2 min for phosphatidylcholine.
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