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Effect of HY-Zeolites on the Performance of Tyrosinase-Modified Carbon Paste Electrodes
Department of Analytical Chemistry, Lund University, Lund, Sweden.
Department of Analytical Chemistry, Lund University, Lund, Sweden.
Department of Analytical Chemistry, Lund University, Lund, Sweden.
Department of Analytical Chemistry, Lund University, Lund, Sweden.
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1996 (English)In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109, Vol. 8, no 12, 1121-1126 p.Article in journal (Refereed) Published
Abstract [en]

The dependence of electrode response on additive properties in enzyme-modified carbon paste was studied. Four different HY-zeolite powders, dealuminated to different extents and characterized by both Si/Al ratio and hydrophilicity, were used as the carbon paste modifiers. The enzyme tyrosinase used in biosensors for the detection of catechol and other phenolic compounds was chosen as the model system for the construction of a composite carbon paste biosensor incorporating different HY-zeolites as additives. Tyrosinase was trapped on the HY-zeolite particles from a buffer solution, dried and mixed with graphite powder and a pasting oil. It was found that by incorporating HY-zeolites into the carbon paste the heterogeneous reaction rate of catechol redox conversion and the signal response for catechol were increased. In the latter case a higher response was observed for increased hydrophilicity, i.e., decreased Si/Al ratio of the HY-zeolite. The carbon paste/solution interface is considered to be an aqueous/organic phase and the characteristics of the enzyme-modified carbon paste electrode are related to theories, explaining enzymatic catalysis in organic solvents.

Place, publisher, year, edition, pages
Weinheim: Wiley-VCH Verlagsgesellschaft, 1996. Vol. 8, no 12, 1121-1126 p.
Keyword [en]
Tyrosinase, Zeolite Biosensor, Phenols
National Category
Analytical Chemistry
Identifiers
URN: urn:nbn:se:hh:diva-24128DOI: 10.1002/elan.1140081209ISI: A1996WG33300008Scopus ID: 2-s2.0-0001335824OAI: oai:DiVA.org:hh-24128DiVA: diva2:679528
Funder
Swedish Research Council
Note

The authors thank the following organizations for financial support: the European Community (EC no. EV5V-CT92-0109), the Swedish Board for Industrial and Technical Development (NUTEK), the Swedish Natural Science Research Council (NFR) and Swedish Research Council (TFR). The Swedish Institute is acknowledged by Tautgirdas Ruzgas for financial support.

Available from: 2013-12-16 Created: 2013-12-09 Last updated: 2015-03-03Bibliographically approved

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