Analysis of solutions containing glutathione and inorganic nitrite: application to nitroglycerin metabolism studies.
Nitroglycerin (GTN) is metabolized to 1,2-dinitroglycerin (1,2-GDN) and 1,3-dinitroglycerin (1,3-GDN) in vivo and in liver homogenates. 1,2-GDN and 1,3-GDN are converted to isomers of glyceryl mononitrate (GMN) in vivo. The denitration reactions yield inorganic nitrite (NO(-)(2)) which is oxidized to inorganic nitrate (NO(-)(3)). Denitration involves utilization of glutathione (GSH). In attempting to use the Bratton-Marshall assay for NO(-)(2) in studies of GTN metabolism in vitro, and in attempting to use Ellman's reagent for GSH in the same research, apparent concentrations of both NO(-)(2) and GSH were noticed lower than anticipated. Apparent mutual interference by NO(-)(2) and GSH in their respective assays was then found. Development of a specific liquid chromatographic method for measurement of NO(-)(2), NO(-)(3), GSH and oxidized glutathione (GSSG) permitted the study of the interaction of NO(-)(2) and GSH, which yielded NO(-)(3) and GSSG.
Curry
S H
SH
Division of Clinical Pharmacokinetics, College of Pharmacy, J. Hillis Miller Health Center, University of Florida, Gainesville, FL 32610, USA.
Aburawi
S M
SM
Whelpton
R
R