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LC-MS/MS method for the simultaneous determination of tenofovir, emtricitabine, elvitegravir and rilpivirine in dried blood spots.
Biomedical Chromatography : BMC 2018 April 27
A simple, short, and rugged LC-MS/MS method for the simultaneous determination of tenofovir, emtricitabine, elvitegravir and rilpivirine was developed and validated. Dried blood spots were prepared with 25 μL of spiked whole blood. A 3 mm punch was extracted with methanol containing labeled internal standards. Ten microliters was injected into the LC-MS/MS using isocratic mobile phase composed of 0.1% formic acid in water and 0.1% formic acid in acetonitrile (45: 55 v/v) at a flow rate of 0.25 mL/min. The method was validated in the range of 10-2000 ng/mL for all four analytes. The intra-assay accuracy (RE) of the method was -4.73-4.78, 1.35-2.89, -8.89 to -0.49 and - 1.40-1.81 for tenofovir, emtricitabine, elvitegravir and rilpivirine, respectively. The inter-assay accuracy was within ±15% of nominal and precision (CV) was <15%. The hematocrit effect on quantification was nonsignificant at the tested hematocrit levels (35-70%). The dried blood spot method showed good agreement with the plasma method, and hence can be used as an alternative to plasma method.
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