Development and Validation of Stability-Indicating HPTLC Method for Estimation of Naratriptan Hydrochloride in Its...

The present research project involves development and validation of a stability-indicating HPTLC method for the estimation of naratriptan-HCl in their pharmaceutical dosage forms and its content uniformity testing. Naratriptan-HCl was subjected to alkaline, acidic, oxidative, neutral, thermal (dry heat) and photo-degradation conditions. The chromatographic separation was carried out using a precoated silica gel G 60 F254 TLC plate as the stationary phase and dichloromethane-toluene-methanol-triethylamine (4 : 4 : 2 : 1, v/v/v/v) as the mobile phase. The spots of NRT-HCl and its degradation products were detected at 290 nm. The Rf value of NRT-HCl was found to be 0.60 ± 0.02. The linearity was obtained in the range of 100-500 ng/spot. The limit of detection and limit of quantitation were found to be 6.07 ng/spot and 18.41 ng/spot, respectively. The percentage recovery was found in the range of 98.87-99.55%. NRT-HCl was degraded under acidic, alkaline and oxidative conditions while stable under photolytic, neutral and dry heat conditions. The developed method was applied for estimation of naratriptan-HCl in marketed formulations and its content uniformity testing.