Figure 3.

HPLC trace. A peptic digest of human plasma (10 μl) that had been treated with sarin was subjected to reverse phase chromatography. Unlabeled active site albumin peptides of mass 1718 and 1831separated from sarin-labeled albumin peptides of mass 1838 and 1951 and from a large peak of UV absorbing material. The marked peaks contain a mixture of peptides and therefore the relative UV intensities do not represent the relative amounts of labeled and unlabeled albumin.