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Method Development and Validation for Measuring O6-Methylguanine in Dried Blood Spot Using Ultra High-Performance Liquid Chromatography Tandem Mass Spectrometry

Authors Harahap Y, Vianney AM, Suryadi H

Received 2 December 2020

Accepted for publication 14 January 2021

Published 3 March 2021 Volume 2021:15 Pages 963—971


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Tuo Deng

Yahdiana Harahap,1,2 Aurelia Maria Vianney,1 Herman Suryadi1

1Faculty of Pharmacy, Universitas Indonesia, Depok, West Java, 16424, Indonesia; 2Indonesia Defense University, Bogor, 16810, West Java, Indonesia

Correspondence: Yahdiana Harahap Email [email protected]

Background: Cyclophosphamide is a nitrogen mustard chemotherapy drug that damages DNA through alkylation in the DNA base and produces DNA adducts. Alkylation that occurs in the N7 position of guanine base has a cytotoxic effect which is useful for cancer therapy. However, the alkylation that occurs in the O6 position of guanine bases can have mutagenic and carcinogenic effects that can trigger secondary cancer. This carcinogenic compound can be found in very low concentrations in cancer patients who had been receiving alkylating agents as their anticancer therapy. Analysis of O6-methylguanine can be one of the ways of therapeutic drug monitoring to avoid secondary cancer risk. This study aims to develop a sensitive, selective, and validated analytical method using Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS).
Methods: Analysis of O6-methylguanine was done in Dried Blood Spot (DBS) and using allopurinol as an internal standard. The optimal analysis conditions were obtained using a C18 Acquity® Bridged Ethylene Hybrid (BEH) column (1.7 μm, 100 mm x 2.1 mm); mobile phase was 0.05% formic acid - acetonitrile (95:5 v/v); flow rate 0.1 mL/minute; gradient elution for 6 minutes; and detection at m/z 165.95 > 149 for O6-methylguanine and m/z 136.9 > 110 for allopurinol.
Results: The present study has fulfilled the FDA validation parameter requirements. The method provides rapid, sensitive, and selective analysis of O6-methylguanine using UPLC-MS/MS with a linear concentration range between 0.5– 20 ng/mL.

Keywords: cyclophosphamide, DNA adduct, O6-methylguanine, UPLC-MS/MS, dried blood spot

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