Valbenazine isomers and enantiomer determination by chiral normal phase liquid chromatography

A novel, simple, specific, rapid, enantioselective normal phase chiral high-performance liquid chromatographic method with amylose-based Chiral Pak IG-3(250 × 4.6 mM) 3.0 μM column was developed and validated for separation and quantification of isomers and enantiomer of Valbenazine. The mobile phase composed of n-Heptane, isopropyl alcohol, dichloromethane, ethanol, and diethylamine in the ratio of 70:10:15:5:0.1 (V/V/V/VV) with a gradient flow rate was applied. The injection volume was 10 μl, and detection was carried out using a photodiode array detector at 282 nM. The column compartment was set at 35°C. The resolution between the enantiomer and isomers was found to be more than 2.0. The method was linear over the concentration range of limit of quantitation to 250% for isomers and enantiomers. The method was found to be robust with column temperature. The proposed chiral method is applicable for the determination of isomers and enantiomer of Valibenazine and was successfully used in the quality control of bulk drug manufacturing and pharmaceuticals.

Anti-microbial lead compound Sulfonamide - Anthranilate derivative Methyl-Ester-Toluene-Sulfonamide and its purity by Liquid Chromatography to develop the New Drug Application

The newly innovated and synthesized lead molecule Methyl-Ester-Toluene-Sulfonamide is the combined derivative of sulphonamide-anthranilate. The estimation was achieved by gradient elution using mobile phase 0.1% Triethylamine in water and with pH 2.0 as mobile phase A and mixture of acetonitrile and tetrahydrofuran in the ratio of (975:25) v/v as mobile phase B at 0.8 mL min^-1 flow rate and 210 nm wavelength on Agilent 1260 infinity series HPLC system equipped with DAD detector. The column used was ACE 3 C18 PFP (250 mm × 4.6 mm) 3 μm column operating at 40 °C temperature. The gradient programme is time (min)/% B: 0.0/50, 3.0/50, 15.0/70, 25.0/90, 30.0/90, 31/50, & 38/50. The method is simple, accurate, rapid and selective. The method was found linear with concentration range of 1.6 to 240 μg/mL. The accuracy data obtained from 98.5 % to 100.5 %. The method validation data and QbD-based robustness study results indicate that the developed method is robust and fit for routine use in the quality control laboratory. Therefore, the ready availability of method can be useful in pharmaceutical new drug development.