Temperature-induced reversible change in the redox response in phenothiazine-labeled poly(ethoxyethyl glycidyl ether) and its application to the thermal control of the catalytic reaction of glucose oxidase

Langmuir : the ACS Journal of Surfaces and Colloids
Naotaka NakadanMasayoshi Watanabe

Abstract

Novel redox-active thermosensitive polymers (phenothiazine-labeled poly(ethoxyethyl glycidyl ether), PT-PEEGE), composed of a polyoxyalkylene backbone, ethoxyethoxymethyl side chains, and an electroactive phenothiazine end group, were prepared by base-catalyzed anionic ring-opening polymerization of ethoxyethyl glycidyl ether monomer in the presence of 10-(2-hydroxyethyl)phenothiazine. Phase separation of a 1.0 mmol dm(-3) (0.33 wt %) PT-PEEGE aqueous solution occurs at 28 degrees C. While the phase separation temperature (Tc) is almost constant in the concentration range above 1.0 mmol dm(-3), it increases at below 1.0 mmol dm(-3). A 10-fold decrease in the oxidation current of PT-PEEGE is observed above Tc and reflects the decrease in the apparent concentration of electroactive PT-PEEGE due to the phase separation. The redox response mainly comes from PT-PEEGE molecules in the dilute phase, resulting from the phase separation, and the half-wave potential and peak separation are independent of the phase separation. This thermally induced change in the redox response is reversible and is applied for the thermal control of the electrocatalytic reaction of glucose oxidase (GOx). The catalytic current in the presence of PT-PEEGE a...Continue Reading

Citations

Apr 17, 2020·Chemistry : a European Journal·Elmira GhabraieNorbert Sewald
May 14, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sayaka InoueMasayoshi Watanabe
Aug 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Michihiro OguraMasayoshi Watanabe

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