Abstract
A colorimetric method for the determination of total sulfhydryl content whole blood or plasma is presented. For whole blood, a mixture of fresh blood and 5,5′-dithiobis(2-nitrobenzoic acid) in diluted buffer is separated on a gel column into the yellow anion and the hemoglobin fraction. The plasma-DTNB mixture was read directly, and a correction for turbidity and/or color made after addition of N-ethylmaleimide. Results of a sample of human bloods are presented. The effects of several detergents yield high values of sulfhydryl in whole blood, which we believe to be artifactual. Studies of the stability of stored blood samples indicate that whole blood, but not plasma, can be kept refrigerated for several days without significant loss of sulfhydryl reaction.
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