Selective quantitation of co-formulated ternary mixture in the presence of potential impurities by liquid chromatographic methods.

Two high performance chromatographic methods were developed and validated for the simultaneous determination of Ambroxol, Guaifenesin and Theophylline in pharmaceutical dosage forms and in the presence of Guaiacol and Caffeine as the officially stated impurities. These were a reversed phase liquid and a thin layer chromatographic methods. The liquid chromatographic separation was achieved using Inertsil ODS-3 C ₁₈ column (4.6 mm × 250 mm, 5 μm). Gradient elution was performed using a mixture of solvent A (0.05 M ammonium acetate, pH 3, adjusted with glacial acetic acid) and solvent B (methanol), at a flow rate of 1.0 mL/min. The separated peaks were detected at 260.0 nm. The thin layer chromatography was performed using HPTLC 60 F ₂₅₄ silica gel plates, mobile phase was consisting of ethyl acetate: methanol: acetic acid (10:0.5:1, v/v/v) and detection was performed at 254.0 nm. Validation of the developed methods was achieved according to International Conference on Harmonization (ICH) guidelines. The proposed methods were fast, accurate, precise, and sensitive. Hence, they could be employed for routine quality control of the ternary mixture in capsule and syrup dosage forms.
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