Research Note: Total Free Sulphydryls of Several White and Red Wines
AbstractTotal free sulphydryl groups were assessed in several white and red wines. Ellman’s method was adapted
to wine samples for the determination of total –SH groups. Total –SH groups of white wines, as glutathione,
were in the range of 315 to 734 and of red wines in the range of 163 to 467 mg/L. In most cases, white wines
exhibited higher values than red wines. The high total sulphydryls of white and red wines indicate their
potential contribution to wine antioxidant capacity.
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