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  • Title: Development and validation of LC-MS/MS method for the estimation of β-hydroxy-β-methylbutyrate in rat plasma and its application to pharmacokinetic studies.
    Author: Deshpande P, Jie Z, Subbarayan R, Mamidi VK, Chunduri RH, Das T, Shreeram S.
    Journal: Biomed Chromatogr; 2013 Feb; 27(2):142-7. PubMed ID: 22623082.
    Abstract:
    A simple, sensitive and specific high-performance liquid chromatography mass spectrometry (LC-MS/MS) method was developed and validated for the quantification of β-hydroxy-β-methyl butyrate (HMB) in small volumes of rat plasma using warfarin as an internal standard (IS). The API-4000 LC-MS/MS was operated under the multiple reaction-monitoring mode using the electrospray ionization technique. A simple liquid-liquid extraction process was used to extract HMB and IS from rat plasma. The total run time was 3 min and the elution of HMB and IS occurred at 1.48 and 1.75 min respectively; this was achieved with a mobile phase consisting of 0.1% formic acid in a water-acetonitrile mixture (15:85, v/v) at a flow rate of 1.0 mL/min on a Agilent Eclipse XDB C(8) (150 × 4.6, 5 µm) column. The developed method was validated in rat plasma with a lower limit of quantitation of 30.0 ng/mL for HMB. A linear response function was established for the range of concentrations 30-4600 ng/mL (r > 0.998) for HMB. The intra- and inter-day precision values for HMB were acceptable as per Food and Drug Administration guidelines. HMB was stable in the battery of stability studies, viz. bench-top, autosampler freeze-thaw cycles and long-term stability for 30 days in plasma. The developed assay method was applied to a bioavailability study in rats.
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