A novel approach for predicting acyl glucuronide reactivity via Schiff base formation: development of rapidly formed peptide adducts for LC/MS/MS measurements

Chemical Research in Toxicology
Jianyao WangRasmy Talaat

Abstract

A novel technique to study the reactivity of acyl glucuronide metabolites to protein has been developed and is described herein. Considered here are acyl glucuronide metabolites, which have undergone the rearrangement of the glucuronic acid moiety at physiological temperature and pH. The investigation of the reactivity of these electrophilic metabolites was carried out by measuring the rate of reaction of rearranged AG metabolites in forming the corresponding acyl glucuronide-peptide adduct in the presence of Lys-Phe. This differs from the parallel technique used in forming AG adducts of proteins that have been previously reported. In the study described here, the Schiff base adduct, diclofenac acyl glucuronide-Lys-Phe product, was generated and structurally elucidated by liquid chromatography tandem mass spectrometry (LC/MS/MS) analysis. The product structure was proved to be a Schiff base adduct by chemical derivatization by nucleophilic addition of HCN and chemical reduction with NaCNBH(3), followed by LC/MS/MS analysis. It is proposed here that the degree of reactivity of acyl glucuronides as measured by covalent binding to protein is proportional to the amount of its peptide adduct generated with the peptide technique desc...Continue Reading

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