BETA-CYCLODEXTRIN CATION-EXCHANGE POLYMER MEMBRANE FOR IMPROVED 2ND-GENERATION GLUCOSE BIOSENSORS

被引:23
作者
CHEN, QA
PAMIDI, PVA
WANG, J
KUTNER, W
机构
[1] NEW MEXICO STATE UNIV,DEPT CHEM & BIOCHEM,LAS CRUCES,NM 88003
[2] POLISH ACAD SCI,INST PHYS CHEM,PL-01224 WARSAW,POLAND
关键词
BIOSENSORS; ENZYMATIC METHODS; ION EXCHANGE; GLUCOSE; GLUCOSE OXIDASE; BETA-CYCLODEXTRIN POLYMER; CARBOXYMETHYLATED; BETA-CYCLODEXTRIN CATION EXCHANGE POLYMER; MEMBRANES; TETRATHIAFULVALENE MEDIATOR; SUPRAMOLECULAR COMPLEX;
D O I
10.1016/0003-2670(94)00647-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Both condensation beta-cyclodextrin polymer (beta-CDP) and condensation carboxymethylated beta-cyclodextrin polymer (beta-CDPA) were used for preparation of membranes for amperometric glucose biosensors. Glucose oxidase (GOD) was covalently immobilized in the membranes and the tetrathiafulvalenium/tetrathiafulvalene (TTF+/TTF) mediating couple was retained in the beta-CDP membrane due to supramolecular complex formation while in the beta-CDPA one due to supramolecular complex formation as well as ion exchange (by the pending carboxymethyl groups). In the latter case, retention of the mediator was greatly improved, leading to a superior biosensor performance. This performance was tested in phosphate buffer pH 7.4 with respect to the optimum GOD and TTF loadings as well as the membrane thickness. Under the optimum conditions, i.e., at the 90 units GOD and 0.1 mg TTF loadings and ca. 45 mu m membrane thickness, the electrode detectability, sensitivity and response time towards glucose were 0.2 mM, 2.54 mu A ml(-1) and 25.5 s, respectively. The (beta-CDPA)-GOD-TTF biosensor displays excellent selectivity towards glucose in the presence of commonly interfering substances, such as ascorbic acid, uric acid and acetaminophen. The (beta-CDPA)-GOD-TTF preparation strategy was employed for fabrication of glucose biosensors based on a disposable screen-printed Ag-carbon strip two-electrode transducer.
引用
收藏
页码:201 / 208
页数:8
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