title: Simultaneous determination of newly developed antiviral agents in pharmaceutical formulations by HPLC-DAD.
abstract: BACKGROUND
  Ombitasvir/paritaprevir/ritonavir/dasabuvir (Viekira Pak®) are the newest medicines approved for use in the treatment of hepatitis C virus (HCV) and are available in tablet form as an oral combination. Specifically, these agents are indicated in the treatment of HCV in patients with genotype 1 infection. Due to the therapeutic importance and increased use of Viekira Pak, proper methods for its determination in bulk and pharmaceutical formulations must be developed.
  
  
  RESULTS
  The present study describes the development and validation of a simple, rapid, selective and economical reverse phase high performance liquid chromatography-diode array detection (HPLC-DAD) method for the simultaneous determination of paritaprevir (PAR), ombitasvir (OMB), dasabuvir(DAS) and ritonavir (RIT) in bulk and pharmaceutical preparations. The proposed method was carried out using an RPC18column (150 × 4.5 mm, 3.5 μ), with a mobile phase consisting of 10 mM phosphate buffer (pH 7)and acetonitrile (35:65, v/v) at a flow rate of 1 ml/min and a detection wavelength of 254 nm. Sorafenib (SOR) was selected as the internal standard to ensure that the quantitative performance was high. The method was validated based on its specificity, linearity, limit of detection, limit of quantitation, accuracy, precision, robustness and stability. The calibration curves for PAR, DAS, RIT and OMB were linear at 2.5-60, 1.25-30, 1.7-40 and 0.42-10 μg/ml, respectively, and all of the correlation coefficients were >0.999.
  
  
  CONCLUSIONS
  The proposed method was successfully applied for the determination of ombitasvir/paritaprevir/ritonavir/dasabuvirin tablets, without interference from the excipient peaks. Hence, the method can be applied for the routine quality control analysis of the studied drugs, either in bulk or dosed forms.Graphical abstractSimultaneous estimation of newly developed antiviral agents in pharmaceutical formulations by HPLC-DAD method.
authors.affiliation: College of Pharmacy, Department of Pharmaceutical Chemistry, King Saud University, P.O. Box 22452, Riyadh, 11495 Saudi Arabia.
authors.forename: Nourah Zoman
authors.initials: NZ
authors.lastname: Al-Zoman
authors.affiliation: College of Pharmacy, Department of Pharmaceutical Chemistry, King Saud University, P.O. Box 22452, Riyadh, 11495 Saudi Arabia ; Faculty of Pharmacy, Department of Pharmaceutical Analytical Chemistry, University of Alexandria, El-Messalah, Alexandria, 21521 Egypt.
authors.forename: Hadir Mohamed
authors.initials: HM
authors.lastname: Maher
authors.affiliation: College of Pharmacy, Department of Pharmaceutical Chemistry, King Saud University, P.O. Box 22452, Riyadh, 11495 Saudi Arabia.
authors.forename: Amal
authors.initials: A
authors.lastname: Al-Subaie
keywords: Antiviral agents; HPLC-DAD; Ombitasvir; Paritaprevir; Ritonavir; Viekira