Immediate Stabilization of Human Blood for Delayed Quantification of Endogenous Thiols and Disulfides

Overview

Journal J Chromatogr B Analyt Technol Biomed Life Sci

Publisher Elsevier

Specialties Biomedical Engineering
Chemistry

Date 2016 Feb 21

PMID 26896310

Citations 9

Authors

Daniela Giustarini

Federico Galvagni

Maurizio Orlandini

Paolo Fanti

Ranieri Rossi

Affiliations

Soon will be listed here.

Abstract

Endogenous thiols undergo rapid and reversible oxidation to disulfides when exposed to oxidants and are, therefore, suitable biomarkers of oxidative stress. However, accurate analysis of thiols in blood is frequently compromised by their artifactual oxidation during sample manipulation, which spuriously elevates the disulfide levels. Here, we describe a validated pre-analytical procedure that prevents both artifactual oxidation of thiols during sample manipulation and their oxidative decay for months in biosamples that are stored at -80°C. Addition of N-ethylmaleimide to blood samples from healthy donors was used to stabilize whole blood, red blood cells, platelets and plasma disulfides, whereas addition of citrate buffer followed by dilution of plasma with H2O was used to stabilize plasma thiols. The concentrations of thiols and disulfides were stable in all biosamples for at least 6 months when analyzed by UV/Vis HPLC at regular intervals. Only 3 ml of blood were needed to perform the analyses of thiols and disulfides in the different blood fractions. This pre-analytical procedure is reliable for use in both animal and human prospective studies. Its ease of implementation makes the method suitable for application to multicenter studies where blood samples are collected by different sites and personnel and are shipped to specific specialized laboratories.

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