Effect of the modification of phenothiazine-labeled poly(ethylene oxide) on the solubility and enzymatic electrocatalytic reaction of glucose oxidase in water/1-butyl-3-methylimidazolium tetrafluoroborate mixtures

Shinichiro Imabayashi, Kunikazu Ishii, Masayoshi Watanabe

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In water/1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4]) mixtures, the solubility and electrocatalytic properties are compared between native glucose oxidase (GOx) mixed with phenothiazine-labeled poly(ethylene oxide) (PT-PEO) mediator and GOx-(PT-PEO) hybrid, in which PT-PEO is covalently attached to the surface lysine residues, under a substrate-saturated and diffusion-limited condition. The electrocatalytic current (Icat) of native GOx mixed with PT-PEO is observed only in the mixtures with low IL content (∼30 wt%) wherein GOx is soluble and decreases with increasing the content of IL. The decrease in Icat is not fully attributable to the reduction in the diffusion rate of mediators due to the increase in the viscosity of the mixtures, suggesting the deterioration of the electron transfer (ET) reaction from FADH2/FADH to PT +-PEO (ket). The modification with PT-PEO not only increases the solubility of GOx but also enhances the ket. The k et value of the hybrids is less influenced by the IL addition than that of the mixed systems, resulting in the smaller dependence of I cat on the IL content and the Icat value larger than that of the corresponding mixed system with the same ratio of [PT-PEO]/[GOx].

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalElectrochemistry Communications
Volume8
Issue number1
DOIs
Publication statusPublished - 2006 Jan
Externally publishedYes

Fingerprint

Glucose Oxidase
Glucose oxidase
Polyethylene oxides
Solubility
Water
phenothiazine
1-butyl-3-methylimidazolium tetrafluoroborate
Lysine
Deterioration
Viscosity
Electrons
Substrates

Keywords

  • 1-Butyl-3-methylimidazolium tetrafluoroborate
  • Electrocatalytic reaction
  • Glucose oxidase
  • Glucose oxidase hybrid
  • Phenothiazine mediator

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

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title = "Effect of the modification of phenothiazine-labeled poly(ethylene oxide) on the solubility and enzymatic electrocatalytic reaction of glucose oxidase in water/1-butyl-3-methylimidazolium tetrafluoroborate mixtures",
abstract = "In water/1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4]) mixtures, the solubility and electrocatalytic properties are compared between native glucose oxidase (GOx) mixed with phenothiazine-labeled poly(ethylene oxide) (PT-PEO) mediator and GOx-(PT-PEO) hybrid, in which PT-PEO is covalently attached to the surface lysine residues, under a substrate-saturated and diffusion-limited condition. The electrocatalytic current (Icat) of native GOx mixed with PT-PEO is observed only in the mixtures with low IL content (∼30 wt{\%}) wherein GOx is soluble and decreases with increasing the content of IL. The decrease in Icat is not fully attributable to the reduction in the diffusion rate of mediators due to the increase in the viscosity of the mixtures, suggesting the deterioration of the electron transfer (ET) reaction from FADH2/FADH to PT +-PEO (ket). The modification with PT-PEO not only increases the solubility of GOx but also enhances the ket. The k et value of the hybrids is less influenced by the IL addition than that of the mixed systems, resulting in the smaller dependence of I cat on the IL content and the Icat value larger than that of the corresponding mixed system with the same ratio of [PT-PEO]/[GOx].",
keywords = "1-Butyl-3-methylimidazolium tetrafluoroborate, Electrocatalytic reaction, Glucose oxidase, Glucose oxidase hybrid, Phenothiazine mediator",
author = "Shinichiro Imabayashi and Kunikazu Ishii and Masayoshi Watanabe",
year = "2006",
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T1 - Effect of the modification of phenothiazine-labeled poly(ethylene oxide) on the solubility and enzymatic electrocatalytic reaction of glucose oxidase in water/1-butyl-3-methylimidazolium tetrafluoroborate mixtures

AU - Imabayashi, Shinichiro

AU - Ishii, Kunikazu

AU - Watanabe, Masayoshi

PY - 2006/1

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N2 - In water/1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4]) mixtures, the solubility and electrocatalytic properties are compared between native glucose oxidase (GOx) mixed with phenothiazine-labeled poly(ethylene oxide) (PT-PEO) mediator and GOx-(PT-PEO) hybrid, in which PT-PEO is covalently attached to the surface lysine residues, under a substrate-saturated and diffusion-limited condition. The electrocatalytic current (Icat) of native GOx mixed with PT-PEO is observed only in the mixtures with low IL content (∼30 wt%) wherein GOx is soluble and decreases with increasing the content of IL. The decrease in Icat is not fully attributable to the reduction in the diffusion rate of mediators due to the increase in the viscosity of the mixtures, suggesting the deterioration of the electron transfer (ET) reaction from FADH2/FADH to PT +-PEO (ket). The modification with PT-PEO not only increases the solubility of GOx but also enhances the ket. The k et value of the hybrids is less influenced by the IL addition than that of the mixed systems, resulting in the smaller dependence of I cat on the IL content and the Icat value larger than that of the corresponding mixed system with the same ratio of [PT-PEO]/[GOx].

AB - In water/1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4]) mixtures, the solubility and electrocatalytic properties are compared between native glucose oxidase (GOx) mixed with phenothiazine-labeled poly(ethylene oxide) (PT-PEO) mediator and GOx-(PT-PEO) hybrid, in which PT-PEO is covalently attached to the surface lysine residues, under a substrate-saturated and diffusion-limited condition. The electrocatalytic current (Icat) of native GOx mixed with PT-PEO is observed only in the mixtures with low IL content (∼30 wt%) wherein GOx is soluble and decreases with increasing the content of IL. The decrease in Icat is not fully attributable to the reduction in the diffusion rate of mediators due to the increase in the viscosity of the mixtures, suggesting the deterioration of the electron transfer (ET) reaction from FADH2/FADH to PT +-PEO (ket). The modification with PT-PEO not only increases the solubility of GOx but also enhances the ket. The k et value of the hybrids is less influenced by the IL addition than that of the mixed systems, resulting in the smaller dependence of I cat on the IL content and the Icat value larger than that of the corresponding mixed system with the same ratio of [PT-PEO]/[GOx].

KW - 1-Butyl-3-methylimidazolium tetrafluoroborate

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KW - Glucose oxidase

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KW - Phenothiazine mediator

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