Identification of degradation impurities in aripiprazole oral solution using LC–MS and development of validated stability indicating method for assay and content of two preservatives by RP-HPLC

Abstract

ABSTRACTA simple and simultaneous reverse phase high-performance liquid chromatographic method was developed for the quantification of aripiprazole (ARI) and two preservatives, namely, methyl paraben and propyl paraben in ARI oral solution. The method was developed on ACE C18 (4.6 × 250 mm, 5 µm) column using gradient elution of 0.1% v/v trifluoroacetic acid in water and acetonitrile as mobile phase components. Flow rate of 1.0 mL/min and 30°C column temperature were used for the method at quantification wavelength of 254 nm. The developed method was validated in accordance with International Conference on Harmonization guideline for various parameters. Forced degradation study was conducted in acid, base, peroxide, heat, and light stress conditions. ARI was found to degrade in oxidation, acid hydrolysis, and heat while it was stable under the remaining conditions. Specificity of the method was verified using Photo Diode Array (PDA) detector by evaluating purity of peaks from degradation samples. Major degradation impurities formed during stress study were identified using liquid chromatography–mass spectrometry method. The present method was useful for determining the content of all the three main analytes present in the oral solution without interference from degradation impurities. The method was robust under the deliberately modified conditions.