A LC-MS/MS assay for the quantitative determination of 2-pyridyl acetic acid, a major metabolite and key surrogate for betahistine, using low volume human K2 EDTA plasma.

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A LC-MS/MS assay for the quantitative determination of 2-pyridyl acetic acid, a major metabolite and key surrogate for betahistine, using low volume human K2 EDTA plasma.

Biomed Chromatogr. 2016 Jul 18;

Authors: Soni K, Bhatt C, Singh K, Bhuvaneshwari PC, Jha A, Patel P, Patel H, Srinivas NR

Abstract
Betahistine is widely used for the treatment of vertigo. Owing to first pass metabolism, 2-pyridyl acetic acid (2PAA, major metabolite of betahistine) was considered surrogate for quantitation. A specific and sensitive LC-MS/MS method was developed and validated for quantitation of 2PAA using turboion spray in a positive ion mode. A solid phase extraction was employed for the extraction of 2PAA and 2PAA d6 I(S) from human plasma. Chromatographic separation of analytes was achieved using an ACE CN, 5 µ (50 x 4.6 mm) column with a gradient mobile phase comprising of acetonitrile: methanol (90: 10% v/v) and 0.7% v/v formic acid in 0.5 mM ATFA in purified water (100% v/v). The retention times of 1.15 min and 1.17 min for 2-PAA acid and IS, respectively, was achieved. Quantitation of 2PAA acid and IS was by monitoring MRM transition pairs (m/z 138.1 to m/z 92.0) & (m/z 142.1 to m/z 96.1), respectively. The developed method was validated for various parameters. The calibration curves of 2PAA showed linearity from 5.0 to 1500 ng/mL, with a lower limit of quantitation of 5.0 ng/mL. The bias and precision for inter- and intra-batch assays were <10%. The developed method was used to support clinical sample analysis.

PMID: 27428039 [PubMed - as supplied by publisher]

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