Development and validation of head-space gas chromatographic method in tandem with flame ionized detection for the determination of residual solvents in letermovir API synthesis Krishnaiah P. Bala1,*, Chandrika R.E.M. Prema2 1Vignan Institute of Pharmaceutical Technology, Beside VSEZ, Kapujaggarajupeta, Duvvada, Visakhapatnam-530049 2K.L.E.F, Vaddeswaram, Guntur District-522502, Andhra Pradesh *Corresponding Author E-mail: balakrishnaiahp@gmail.com
Online published on 14 June, 2022. Abstract Residual solvent testing is an integral part of reference material certification. A gas chromatography/flame ionization detector/headspace method has been developed and validated to detect and quantitate commonly used residual solvents in our production processes: ethyl acetate, MTBE, Toluene and isopropyl acetatein Letermovir API. HS-GC method in a simple and selective manner is delineated for the quantification and determination of Residual Solvents in Letermovir API. The separation of solvents along with drug on Chromatographic chamber was processed on USP G43 equivalent capillary column Thermo Scientific Trace GOLD TG-624 SilMS, 30 m x 0.32mm x 1.8µm column (P/N 26059-3390) using nitrogen as carrier gas by using different temperature gradient of FID Detectors. Linearity was observed in the range 10–50µg/ml for ethyl acetate, MTBE, Toluene and isopropyl acetate (r2>0.999) for the amount of solvent determined through sophisticated methods was in good agreement. The proposed methods were validated. The method of accuracy was assessed by recovery studies at three different levels.The method was found to be precise as indicated by the repeatability analysis, showing %RSD less than 10 for ethyl acetate, MTBE, Toluene and isopropyl acetate. All statistical data proves validity of the methods and can be used for routine analysis of pharmaceutical active ingredients for estimation of Residual Solvents of ethyl acetate, MTBE, Toluene and isopropyl acetate in Letermovir. Method validation comprised the following parameters: limit of detection (LOD), limit of quantitation (LOQ), linearity and range, accuracy, precision (repeatability and intermediate precision), system suitability, specificity, and robustness. Linearity (micrograms/mL) and LOQ (ppm) are listed for each solvent in manuscript. The present method was proven to be robust and accurate for quantitative analysis of residual solvent in neat materials. Top Keywords Letermovir, Head-Space GC, Residual solvents. Top |