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- W2367079306 abstract "The absorption spectra of the adducts between 1,4-naphthoquinone and sulphydryl compounds such as thioglycolic acid, ethyl mercaptan, glutathione and the sulphydryl form of several proteins have been found to show maxima near 420mμ. With a given amount of naphthoquinone, the optical density increased linearly with increasing concentrations of the sulphydryl compound until an equivalent amount of the latter was added. Although the absorption spectra of the adducts were affected by the nature and the pH of the solvent system, under a given condition, they were all closely similar with an extinction coefficient at 415 mμ of about 1.9 mM~(-1).As the adduct between thioglycolic acid and naphthoquinone can be quantitatively removed by extraction with ether, this can be utilized for the determination of protein sulphydryl groups in presence of thioglycolic acid in excess. In a mixture with excess thioglycolic acid, glutathione can be satisfactorily determined by this method. The course of reduction of the disulphide linkages of insulin by thioglycolic acid has been followed by this method and was found to reach completion in 6 hrs. at 30℃ in a solution of 8M urea at pH 5." @default.
- W2367079306 created "2016-06-24" @default.
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- W2367079306 date "1963-01-01" @default.
- W2367079306 modified "2023-09-26" @default.
- W2367079306 title "THE DETERMINATION OF PROTEIN SULPHYDRYL GROUPS IN PRESENCE OF EXCESS THIOGLYCOLIC ACID" @default.
- W2367079306 hasPublicationYear "1963" @default.
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