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Rasayan Journal of Chemistry ; 14(4):2639-2644, 2021.
Article in English | Scopus | ID: covidwho-1614546


Remdesivir (RMDSVR) is a pro-drug of an ATP analog, with antiviral activity against RNA viruses. In 2016 RMDSVR is used in the treatment of Ebola and 2017 RMDSVR was tested against SARS-CoV-2. The HPLC analysis was performed on the Agilent 1100 series HPLC with Quaternary G1311 A pump, ChromosilC18 column (250 X 4.6 mm, 5μ) column, with a mixture of Acetonitrile, Methanol and 0.1% OPA in the ratio of 65:30:5 (v/v) as the mobile phase, at 0.8 mL/min flow rate and UV detection at 272 nm. Abacavir (ABVR) is considered an internal standard and the retention time was observed at 6.0 min and 9.1 min for RMDSVR and ABVR respectively. The calibration curve was obtained linearly in the concentration range of 10-70 ng/mL. the method was validated and all the validated parameters were within the acceptable limit confirms that the method is suitable for the analysis of RMDSVR in spiked human plasma. © 2021, Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma. All rights reserved.

Molecules ; 26(13)2021 Jun 22.
Article in English | MEDLINE | ID: covidwho-1288957


In the current work, a simple, economical, accurate, and precise HPLC method with UV detection was developed to quantify Favipiravir (FVIR) in spiked human plasma using acyclovir (ACVR) as an internal standard in the COVID-19 pandemic time. Both FVIR and ACVR were well separated and resolved on the C18 column using the mobile phase blend of methanol:acetonitrile:20 mM phosphate buffer (pH 3.1) in an isocratic mode flow rate of 1 mL/min with a proportion of 30:10:60 %, v/v/v. The detector wavelength was set at 242 nm. Maximum recovery of FVIR and ACVR from plasma was obtained with dichloromethane (DCM) as extracting solvent. The calibration curve was found to be linear in the range of 3.1-60.0 µg/mL with regression coefficient (r2) = 0.9976. However, with acceptable r2, the calibration data's heteroscedasticity was observed, which was further reduced using weighted linear regression with weighting factor 1/x. Finally, the method was validated concerning sensitivity, accuracy (Inter and Intraday's % RE and RSD were 0.28, 0.65 and 1.00, 0.12 respectively), precision, recovery (89.99%, 89.09%, and 90.81% for LQC, MQC, and HQC, respectively), stability (% RSD for 30-day were 3.04 and 1.71 for LQC and HQC, respectively at -20 °C), and carry-over US-FDA guidance for Bioanalytical Method Validation for researchers in the COVID-19 pandemic crisis. Furthermore, there was no significant difference for selectivity when evaluated at LLOQ concentration of 3 µg/mL of FVIR and relative to the blank.

Amides/analysis , Amides/blood , Antiviral Agents/analysis , Antiviral Agents/blood , Biological Assay/methods , COVID-19/drug therapy , Chromatography, High Pressure Liquid/methods , Liquid-Liquid Extraction/methods , Pyrazines/analysis , Pyrazines/blood , Acyclovir/analysis , Acyclovir/blood , COVID-19/blood , Calibration , Drug Stability , Freezing , Humans , Reference Standards , Reproducibility of Results , Solvents/chemistry