Quantitative Estimation of 10 Known Impurities from Indacaterol Acetate, Glycopyrronium, and Mometasone Furoate Dry Powder Inhalation Product

Indacaterol, glycopyrronium, and mometasone furoate triple combination inhalable fixed-dose medicines are effectively used to treat asthma and various chronic pulmonary disorders. The study aimed to develop and validate a simple single-run RP-HPLC impurity quantitation method. The chromatographic separation was accomplished using gradient elution mode of mobile phase A (potassium dihydrogen phosphate buffer pH 2.2) and mobile phase B (mixture of acetonitrile and methanol), with a flow rate of 0.8 mL/min using YMC Triart, C₁₈ (250 × 4.6 mm, 5 µm) HPLC column at 45 °C and the detection wavelength of 210 nm (for indacaterol, glycopyrronium and their impurities) and 248 nm (for mometasone furoate and its impurities). Water and methanol (20:80) were used as a diluent. Quantitation of 10 known and several unknown impurities was successfully performed with the determination of relative response factors for all the known impurities. The developed method was validated as per the ICH Q2(R1) guidelines. The stability indicating the nature of the method was proved by performing stress study on the sample and placebo. The linearity and range of the method were proved by calculating the r² values (> 0.998). The overall precision was found to be within 1.82 − 7.76% RSD. The recovery for all the actives and known impurities were within 90 − 115% with 0.4 − 12% RSD. The sample solution was stable for 2 days at room temperature. The developed method can be successfully used for the impurity analysis of routine, stability, and commercial samples in a quality control laboratory of the pharmaceutical industry.