Abstract
The sensitivity and selectivity of resonance Raman spectroscopy, combined with electronic spectroscopy, has been used to develop a method to quantify the membrane thiol population in situ in viable erythrocytes. This technique is based on the thiol-disulfide reaction of Ellman's reagent (5,5'-dithio-bis-2-nitrobenzoic acid). It has the advantage that continuous monitoring of lysis is simple and a correction can be made for any interference resulting from lysis. In addition, the extent of reaction can be expressed as a ratio of the reagent signal, providing an internal calibrant.
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