Stability Indicating RP-UPLC Method for Quantification of Glycopyrrolate, Methylparaben and Propylparaben Assay in Liquid Oral Formulation

Abstract

Stability indicating RP-UPLC technique was developed for the simultaneous quantification of glycopyrrolate, methylparaben, and propylparaben in glycopyrrolate oral solution. The method was established by using gradient UPLC and a Waters Acquity UPLC BEH C18, 100 mm 2.1 mm, i.d 1.7 μm particle size column with a gradient program of mobile phase A and mobile phase B with a flow rate of 0.25 mL/minute, UV wavelength detection at 222 nm, column temperature of 40°C, injection volume of 2 μL, mobile phase A contains 0.05% trifluoro acetic acid in water and Acetonitrile (90:10) v/v and mobile phase-B contains 0.05% trifluoro acetic acid in water and Acetonitrile (10:90) v/v. The current research describes a single UPLC method for developing an assay method for Glycopyrrolate Oral solution that includes Glycopyrrolate (Active), Methylparaben (Preservative), and Propylparaben (Preservative). The assay method was validated in accordance with ICH guidelines. The retention times of glycopyrrolate, methyl paraben and propylparaben were 6.051 min, 3.458 min and 8.095 min, respectively. Linearity range of glycopyrrolate, methyl paraben and propylparaben were in the range of 4 - 32 μg per mL, 35 - 290 μg per mL and 4 - 32 μg per mL, respectively. Recovery of glycopyrrolate, methylparaben and propylparaben ranged from 100.1% to 98.9%, 100.2% - 100.8%, and 100.2% - 100.8%. Validation of analytical method demonstrated that the method is suitable, specific, linear, accurate, precise, rugged and stability indicating for estimating three components in the pharmaceutical dosage form.