http://dx.doi.org/10.1016/j.aca.2015.01.044">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

A novel method of liquid chromatography-tandem mass spectrometry combined with chemical derivatization for the determination of ribonucleosides in urine

Language

English

Abstract

Copyright © 2015 Elsevier B.V. All rights reserved. Ribonucleosides are the end products of RNA metabolism. These metabolites, especially the modified ribonucleosides, have been extensively evaluated as cancer-related biomarkers. However, the determination of urinary ribonucleosides is still a challenge due to their low abundance, high polarity and serious matrix interferences in urine samples. In this study, a derivatization method based on a chemical reaction between ribonucleosides and acetone to form acetonides was developed for the determination of urinary ribonucleosides. The derivative products, acetonides, were detected by using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The methodological evaluation was performed by quantifying four nucleosides for linear range, average recovery, precision, accuracy and stability. The validated procedures were applied to screen modified ribonucleosides in urine samples. Improvement of separation and enhancement of sensitivity were obtained in the analysis. To identify ribonucleosides, inexpensive isotope labeling acetone (acetone-d6) and label-free acetone were applied to form ordinary and deuterated acetonides, respectively. The two groups of samples were separated with orthogonal partial least squares (OPLS). The ordinary and deuterated pairs of acetonides were symmetrically distributed in the S-plot for easy and visual signal identification. After structural confirmation, a total of 56 ribonucleosides were detected, 52 of which were modified ribonucleosides. The application of derivatization, deuterium-labeling and multivariate statistical analysis offers a new option for selective detection of ribonucleosides in biological samples.

Keywords

Acetonides, Derivatization, Liquid chromatography–tandem mass spectrometry, Modified nucleosides, Ribonucleosides

Publication Date

2015

Source Publication Title

Analytica Chimica Acta

Volume

864

Start Page

30

End Page

38

Publisher

Elsevier

ISSN (print)

00032670

ISSN (electronic)

18734324

This document is currently not available here.

Share

COinS