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Glucose oxidase, horseradish peroxidase and phenothiazine dyes-co-adsorbed carbon felt-based amperometric flow-biosensor for glucose.
- Source :
-
Analytical methods : advancing methods and applications [Anal Methods] 2024 Aug 29; Vol. 16 (34), pp. 5883-5895. Date of Electronic Publication: 2024 Aug 29. - Publication Year :
- 2024
-
Abstract
- To develop an amperometric flow-biosensor for glucose, the stabilizing effect of methylene blue (MB) toward adsorbed glucose oxidase (GOx) on carbon felt (CF) was successfully applied to prepare the GOx-modified CF-based enzyme reactor combined with a horseradish peroxidase (HRP)-modified CF-based H <subscript>2</subscript> O <subscript>2</subscript> detector. Upon mixing MB in the GOx-adsorption solution, the O <subscript>2</subscript> -dependent GOx-activity was significantly increased with increasing concentration of MB in the GOx-adsorption solution. The GOx-immobilization protocol on CF is very straightforward [ i.e. , adsorption of the GOx/MB mixed aqueous solution for 5 min under ultrasound (US)-irradiation]. Under the optimized operational conditions ( i.e. , applied potential, 0 vs. Ag/AgCl; carrier pH, 5.0; carrier flow rate, 4.0 mL min <superscript>-1</superscript> ), the resulting GOx/MB-CF-reactor and HRP/TN-CF-detector combined amperometric flow-biosensor exhibited sensitive, selective, reproducible and stable cathodic peak current responses to glucose with the following analytical performances: sensitivity, 6.22 μA mM <superscript>-1</superscript> ; linear range, 0.01 to 1 mM; limit of detection, 9.6 μM (S/N = 3, noise level, 20 nA); sample throughput, 46-96 samples per h for 10-0.1 mM glucose. The developed amperometric flow-biosensor allowed the determination of glucose in beverages and liquors, and the analytical results by the sensor were in fairly good agreement with those by conventional spectrophotometry.
- Subjects :
- Phenothiazines chemistry
Enzymes, Immobilized chemistry
Adsorption
Electrochemical Techniques methods
Coloring Agents chemistry
Limit of Detection
Methylene Blue chemistry
Hydrogen Peroxide chemistry
Glucose Oxidase chemistry
Glucose Oxidase metabolism
Horseradish Peroxidase chemistry
Biosensing Techniques methods
Glucose chemistry
Glucose analysis
Carbon chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1759-9679
- Volume :
- 16
- Issue :
- 34
- Database :
- MEDLINE
- Journal :
- Analytical methods : advancing methods and applications
- Publication Type :
- Academic Journal
- Accession number :
- 39157883
- Full Text :
- https://doi.org/10.1039/d4ay01028k