Developing a Robust, Fast and Reliable Measurement Method for the Analysis of Methylarginine Derivatives and Related Metabolites

Overview

Journal J Mass Spectrom Adv Clin Lab

Specialty General Medicine

Date 2021 Nov 25

PMID 34820664

Citations 1

Authors

Duygu Eryavuz Onmaz

Sedat Abusoglu

Havva Yaglioglu

Gulsum Abusoglu

Ali Unlu

Affiliations

Soon will be listed here.

Abstract

Background: Nitric oxide (NO) plays an important role in endothelial homeostasis. Asymmetric dimethyl arginine (ADMA), L-N monomethyl arginine (L-NMMA) and symmetric dimethyl arginine (SDMA), which are derivatives of methylarginine, directly or indirectly reduce NO production. Therefore, these metabolites are an important risk factor for various diseases, including cardiovascular diseases. Numerous methods have been developed for the measurement of methylarginine derivatives, but various difficulties have been encountered. This study aimed to develop a reliable, fast and cost-effective method for the analysis and measurement of methylarginine derivatives (ADMA, SDMA, L-NMMA) and related metabolites (arginine, citrulline, homoarginine, ornithine), and to validate this method according to Clinical and Laboratory Standards Institute (CLSI) protocols.

Methods: For the analysis of ADMA, SDMA, L-NMMA, arginine, homoarginine, citrulline, ornithine, 200 Âµl of serum were precipitated with methanol, and subsequently derivatized with a butanol solution containing 5% acetyl chloride. Butyl derivatives were separated using a C18 reverse phase column with a 5 min run time. Detection of analytes was achieved by utilising the specific fragmentation patterns identified through tandem mass spectrometry.

Results: The method was linear for ADMA, SDMA, L-NMMA, ornithine, arginine, homoarginine and citrulline in the ranges of 0.023-6.0, 0.021-5.5, 0.019-5.0, 0.015-250, 0.015-250, 0.019-5 and 0.015-250 µM, respectively. The inter-assay CV% values for all analytes was less than 9.8%.

Conclusions: Data obtained from method validation studies shows that the developed method is highly sensitive, precise and accurate. Short analysis time, cost-effectiveness, and multiplexed analysis of these metabolites, with the same pretreatment steps, are the main advantages of the method.

Citing Articles

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