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• W2963940505 abstract "The first bioanalytical assay for tivozanib in human and mouse plasma, mouse tissue homogenates and culture medium was developed and validated over a linear dynamic range from 0.5 to 5000 ng/mL. The extended concentration range will cover the quantification of tivozanib in the majority of study samples, reducing the need for reanalysis which is often not possible due to limited amount of sample in preclinical studies. A simple and fast pretreatment method was used consisting of protein precipitation with acetonitrile followed by dilution of the supernatant. The final extract was injected onto an Ultra-Performance Liquid Chromatography (UPLC) BEH C18 column with gradient elution of formic acid in water and formic acid in acetonitrile mobile phase. Chromatographic separation was followed by detection with a triple-quadrupole mass spectrometer operating in the positive ion-mode. By simultaneously monitoring the sensitive conventional [M + H] + isotopologue- product transition for quantification of low concentrations and a less abundant [M + H] + +1 isotopologue- product transition to reduce the sensitivity for quantification of high concentrations, we were able to extend the overall linear dynamic range up to 0.5–5000 ng/mL. A full validation was performed in human plasma and a partial validation was executed for the other matrices. All results were within the acceptance criteria of the European Medicines Agency (EMA) guidelines and the US Food and Drug Administration (FDA) guidance, except for the carry-over. This was solved by the analysis of extra matrix blanks and by grouping study samples containing a high tivozanib concentration in the sample sequence. In this way carry-over did not impact the data integrity. We demonstrated that by measuring two multiple reaction monitoring (MRM) transitions for tivozanib, the linear dynamic range could be extended from two to four decades. The assay was successfully applied in pharmacokinetic studies in mice and a transport assay. • First reported validated LC-MS/MS assay for tivozanib bioanalysis • Broad linear dynamic range of four decades by measuring two MRM transitions • Validated in human and mouse plasma, mouse tissue homogenates and culture medium • Successfully applied in pharmacokinetic studies in mice and a transport assay" @default.
• W2963940505 created "2019-07-30" @default.
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• W2963940505 date "2019-09-01" @default.
• W2963940505 modified "2023-10-02" @default.
• W2963940505 title "Development and validation of an LC-MS/MS method with a broad linear dynamic range for the quantification of tivozanib in human and mouse plasma, mouse tissue homogenates, and culture medium" @default.
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• W2963940505 doi "https://doi.org/10.1016/j.jchromb.2019.121723" @default.
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