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• W3007857712 abstract "Isosinensetin is a polymethoxyflavone existing in various kinds of citrus. It has exhibited significant anti-proliferative activity and herb-drug interaction. To date, a specific determination method to quantify isosinensetin concentration in biological matrix has not been developed. In the present study, a highly specific, simple and sensitive ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) approach was developed and validated for quantification of isosinensetin in rat plasma with subsequent application to a pharmacokinetic study. Isosinensetin and lysionotin (internal standard, IS) were extracted from rat plasma by a single step protein precipitation using acetonitrile as precipitation agent. The chromatographic separation was conducted using an Agilent C18 column with a gradient elution system (0.1 % formic acid aqueous solution and acetonitrile) within 3.5 min. An electrospray ionization (ESI) source operating in positive mode and multiple reaction monitoring (MRM) were used to monitor the transitions of m/z 373.1 → 343.1 for isosinensetin and m/z 345.1 → 315.1 for IS. The developed method was linear within the range of 1―1000 ng/mL and fully validated according to FDA guidelines. The accuracy values reported as relative errors were between 2.0 and 10.0 % for three quality control levels (2, 400 and 800 ng/mL) and lower limit of quantification (LLOQ). The precisions were ≤11.1 % for quality controls and ≤18.1 % for LLOQ. The recoveries and matrix effects of isosinensetin were in the range of 83.4―87.7 % and 105.6―108.8 %, respectively. Other parameters such as selectivity, carryover effect, dilution integrity and stability were also validated and met the acceptance criteria. The method was applied to a pharmacokinetic study in rats following oral and intravenous administration of isosinensetin. Isosinensetin was rapidly absorbed with a poor bioavailability of 2.19 % and quickly eliminated with mean half-life of 1.40 h and 1.76 h for oral and intravenous route, respectively." @default.
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• W3007857712 date "2020-05-01" @default.
• W3007857712 modified "2023-09-25" @default.
• W3007857712 title "Determination of isosinensetin in rat plasma by UHPLC-MS/MS: Application to oral and intravenous pharmacokinetic study in healthy rats" @default.
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• W3007857712 doi "https://doi.org/10.1016/j.jpba.2020.113210" @default.
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