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• W2118045361 abstract "The HIV-1 reverse transcriptase inhibitors tenofovir (TFV), emtricitabine (FTC), and lamivudine (3TC) are widely used in the treatment of HIV-1-infected persons and are now being considered as chemoprophylactic drugs for the prevention of sexual HIV transmission. Assays that measure these drugs after either oral or topical application are critical to the understanding of the pharmacokinetic profiles of the drugs and allow a rational design of chemoprophylaxis modalities for evaluation in macaque models and human trials. We developed a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS-MS) method for sensitive measurement of FTC, 3TC, and TFV in plasma from macaques. To achieve detection limits of 10 pg on column, the plasma analytes were measured using acidic mobile phase and positive electrospray ionization MS-MS detection. However, this caused various chromatographic peak distortions, which were minimized by using mobile phase additives that induced ion-pairing interactions. Chromatographic peak tailing was minimized by adjusting the organic mobile phase concentration while considering the simultaneous effect of organic content on buffer and analyte pKa. Injection solution interferences were corrected by chromatographic peak focusing using column switching. The final method provides simultaneous measurement of all three analytes with a wide linear range of 1-3000 ng/mL using 0.1 mL plasma (10 pg on column) and coefficients of variation from 5% to 15% in the high ng/mL concentration range and from 16% to 20% in the low ng/mL concentration range." @default.
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• W2118045361 date "2009-05-01" @default.
• W2118045361 modified "2023-10-14" @default.
• W2118045361 title "Effect of Mobile Phase pH and Organic Content on LC--MS Analysis of Nucleoside and Nucleotide HIV Reverse Transcriptase Inhibitors" @default.
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• W2118045361 doi "https://doi.org/10.1093/chromsci/47.5.365" @default.
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