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• W2017205053 abstract "A simple, sensitive and high throughput liquid chromatography/positive-ion electrospray ionization mass spectrometry (LC–ESI-MS/MS) method has been developed for the simultaneous determination of valacyclovir and acyclovir in human plasma using fluconazole as internal standard (IS). The method involved solid phase extraction of the analytes and IS from 0.5 mL human plasma with no reconstitution and drying steps (direct injection of eluate). The chromatographic separation was achieved on a Gemini C18 analytical column using isocratic mobile phase, consisting of 0.1% formic acid and methanol (30:70 v/v), at a flow-rate of 0.8 mL/min. The precursor → product ion transition for valacyclovir (m/z 325.2 → 152.2), acyclovir (m/z 226.2 → 152.2) and IS (m/z 307.1 → 220.3) were monitored on a triple quadrupole mass spectrometer, operating in the multiple reaction monitoring (MRM) mode. The method was validated over the concentration range 5.0–1075 ng/mL and 47.6–10225 ng/mL for valacyclovir and acyclovir respectively. The mean recovery of valacyclovir (92.2%), acyclovir (84.2%) and IS (103.7%) from spiked plasma samples was consistent and reproducible. The bench top stability of valacyclovir and acyclovir was extensively evaluated in buffered and unbuffered plasma. It was successfully applied to a bioequivalence study in 41 healthy human subjects after oral administration of 1000 mg valacyclovir tablet formulation under fasting condition." @default.
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• W2017205053 date "2009-03-01" @default.
• W2017205053 modified "2023-10-16" @default.
• W2017205053 title "Stability evaluation and sensitive determination of antiviral drug, valacyclovir and its metabolite acyclovir in human plasma by a rapid liquid chromatography–tandem mass spectrometry method" @default.
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• W2017205053 doi "https://doi.org/10.1016/j.jchromb.2009.01.042" @default.
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