Electrochemical Sensor for Carbonyl Groups in Oxidized Proteins
- Teodor Adrian EnacheTeodor Adrian EnacheNational Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, RomaniaMore by Teodor Adrian Enache
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- Elena MateiElena MateiNational Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, RomaniaMore by Elena Matei
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- Victor Constantin Diculescu*Victor Constantin Diculescu*Phone: +40213690185. E-mail: [email protected]National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, RomaniaMore by Victor Constantin Diculescu
Abstract
The interaction of proteins with free radicals leads, among other types of damages, to the production of stable carbonyl groups, which can be used as a quantification of oxidative stress at proteins level. The aim of this study was the development of an electrochemical sensor for the detection of carbonyl groups in proteins oxidized by reactive oxygen species. Its working principle is based on the redox properties of dinitrophenylhydrazine (DNPH). BSA was used as a model protein and its oxidation achieved through Fenton reactions. Using differential pulse voltammetry at glassy carbon electrode, the electrochemical behavior of DNPH and of the native and oxidized BSA was investigated in solution. It has been shown that the hydrazine moiety of the DNPH is the electroactive center and is responsible for carbonyl complexation. Special attention was paid to the immobilization of the DNPH in order to retain its redox properties, and this was achieved on a mixed 4-styrenesulfonic acid-nafion matrix. The sensor’s surface characterization and the detection of carbonyl groups in oxidized protein were performed by voltammetry, Fourier-transformed infrared spectroscopy and scanning electron microscopy while the voltammetric results were confirmed by surface plasmon resonance measurements. It has been shown that upon interaction with carbonyl groups of the oxidized protein, the oxidation peak of the hydrazine moiety of DNPH decreases as a function of incubation time and protein concentration. The sensor sensitivity was 0.015 nmol carbonyl per mg of oxidized protein and detection limits of 50 μg oxidized BSA and 0.75 pmol carbonyls.
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