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In cells, the ratio/equilibrium between oxidized and reduced forms of glutathione and between cysteine and cystine (main cells antioxidants) affect thiol balance and redox status of cells and proteins (4). In general, spectroscopic and chromatographic methods are used for quantitative determination of low-molecular thiols and sulfhydryl groups in proteins. Optical methods are employed to detect absorption or fluorescence, which appears on results of interaction between reagents and free SH groups. However, samples must be optically transparent, so preliminary homogenation and centrifugation of biological samples and other procedures are necessary (4). Chromatographic methods, especially HPLC (4), cannot be used for express analysis of thiol status of biological samples.

Quantitative Determination of Thiol Status of Proteins and Cells by Nitroxyl Biradical .RS-SR.