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Wong EYL, Loh GOK, Goh CZ, Tan YTF, Ng SSM, Law KB, Cheah KY, Mohd HF, Peh KK. Sample preparation and quantification of polar drug, allopurinol, in human plasma using LCMSMS. Eur J Mass Spectrom (Chichester) 2022; 28:35-46. [PMID: 35668610 DOI: 10.1177/14690667221105837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A fast, selective and reproducible LC-MS/MS method with simple sample preparation was developed and validated for a polar compound, allopurinol in human plasma, using acyclovir as internal standard (IS). Chromatographic separation was achieved using Agilent Poroshell 120 EC-C18 (100 × 2.1 mmID, 2.7 µm) analytical column. The mobile phase was comprised of 0.1%v/v formic acid-methanol (95:05; v/v), at a flow rate of 0.45 mL/min. The effect of different protein precipitation agents used in sample preparation such as methanol, acetonitrile, a mixture of acetonitrile-methanol and a mixture of acetonitrile-acetone were evaluated to optimize the extraction efficiency of allopurinol and IS. The use of acetone-acetonitrile (50:50, v/v) as protein precipitating agent shortened the sample preparation time and improved the recovery of allopurinol to above 93%. The IS-normalised matrix factors at two concentration levels were 1.0, with CV of 5.1% and 4.2%. Allopurinol in plasma was stable at benchtop for 24 h, in autosampler tray for 48 h, in instrumentation room for 48 h, in freezer after 7 freeze-thaw cycles and in freezer for 140 days. Allopurinol stock standard solutions were stable for 140 days at room temperature and in the chiller. The short sample run time of the validated bioanalytical method allowed high throughput analysis of plasma samples in pharmacokinetic study of an allopurinol formulation. The robustness and reproducibility of the bioanalytical method was reaffirmed through incurred sample reanalysis (ISR).
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Affiliation(s)
| | | | - Chen Zhu Goh
- 619929Bioxis Sdn Bhd, Simpang Ampat, Pulau Pinang, Malaysia
| | | | - Sharon Shi Min Ng
- Centre for Clinical Trial, Institute for Clinical Research, 576396Ampang Hospital, Ministry of Health, Ampang, Selangor, Malaysia
| | - Kian Boon Law
- Centre for Clinical Trial, Institute for Clinical Research, 576396Ampang Hospital, Ministry of Health, Ampang, Selangor, Malaysia
| | - Kit Yee Cheah
- Centre for Clinical Trial, Institute for Clinical Research, 576396Ampang Hospital, Ministry of Health, Ampang, Selangor, Malaysia
| | - Hani Farhana Mohd
- Centre for Clinical Trial, Institute for Clinical Research, 576396Ampang Hospital, Ministry of Health, Ampang, Selangor, Malaysia
| | - Kok Khiang Peh
- School of Pharmaceutical Sciences, 26689Universiti Sains Malaysia, Minden, Penang, Malaysia
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