Immobilization of glucose oxidase and polyphenol oxidase in poly(n-(4-(3-thienyl methylene)-oxycarbonylphenyl) maleimide)-co-pyrrole) matrice

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye

Tezin Onay Tarihi: 2006

Öğrenci: MAHMUT ÇİL

Danışman: LEVENT KAMİL TOPPARE

Özet:

In this study, glucose oxidase and polyphenol oxidase were immobilized in conducting copolymer poly(N-(4-(3-thienyl methylene)-oxycarbonylphenyl)maleimide)-co-pyrrole(P(MBThi-co-Py)). A copolymer was electrochemically synthesized by using sodium dodecyl sulfate (SDS) as supporting electrolyte and characterized by FTIR, scanning electron microscopy (SEM) and conductivity measurements. Immobilization of glucose oxidase (GOD) and polyphenol oxidase (PPO) enzymes were performed in conducting PPy and P(MBThi-co-Py) matrices by electropolymerization. Kinetic parameters, maximum reaction rate (Vmax) and Michaelis-Menten constant (Km) were determined for the enzyme electrodes by help of Lineweaver-Burk plot. Effect of temperature and pH on GOD and PPO activity was examined. Operational stability and long term stability of the enzyme electrodes were investigated. The immobilized GOD and PPO electrodes were used for determination of glucose amount in Turkish orange juices and analyzing the concentration of phenolic compounds in Turkish red wines respectively.