Improved biosensor for glucose based on glucose oxidase-immobilized silk fibroin membrane |
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Authors: | Yu-Qing Zhang Jiang Zhu Ren-Ao Gu |
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Institution: | (1) Biotechnology College, Suzhou University, 215151 Xushuguan, Suzhou, P.R. China |
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Abstract: | Based on glucose oxidase-immobilized silk fibroin membrane and oxygen electrode, the authors have developed an amperometric
glucose sensor in flow-injection analysis. After the sensor was improved by the configuration of oxygen electrode and a temperature
control system was added to the electrode body, its sensitivity, analytical precision, and stability were enhanced greatly.
The authors first introduced a tailing inhibitor-ion pair reagent into a buffer system in the biosensor so as to eliminate
all interference from hemacyte, macromolecules, and small mol wt charged species besides electroactive specie ascorbate in
complex matrices. A considerably serious tailing of the biosamples, such as whole blood, plasma, serum, or urine on the sensor,
based on enzyme electrode, entirely disappeared, their response times were shortened, and base lines became more smooth and
stable. The glucose sensor has a broad range of linear response for glucose (up to 25.0 mmol/L) and a good correlation (γ
= 0.999) under conditions of control temperature 32.0°C and 1.6 mL/min 0.02 mol/L phosphate buffer containing 0.5% tailing
inhibitor (v/v). Recoveries of glucose in these biosamples are within the range of 93.71–105.88%, and its repeatabilities
for determining glucose, repeated 100 times, human blood dilution 125 times, and serum 128 times, are 1.81,2.48, and 2.91%
(RSD), respectively. The correlation analysis for 200 serum samples showed that the correlation (γ) is 0.9934 between the
glucose sensor and Worthington method for determining serum glucose used conventionally in a hospital laboratory. Moreover,
the enzyme membrane used in the biosensor can be stored for a long time (over 2 yr) and measured repeatedly over 1000 times
for biosamples. The glucose sensor is capable of detecting over 60 biosamples/hr. |
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Keywords: | Glucose sensor glucose oxidase-immobilized fibroin membrane oxygen electrode immobilized enzyme flow-injection analysis ion pair reagent |
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