New spectrophotometric method for the determination of gabapentin in bulk and dosage forms using p -dimethylaminobenzaldehyde

摘要

A new simple, accurate and economic spectrophotometric method based on azo dye derivatizationfor the determination of gabapentin (GBP) was developed. Critical factors were optimized.The method was validated and assay of dosage forms was done. Spot tests and TLC confirmed theformation of azo adduct. A 0.3 M NaNO2 solution using 2 M HCl was used for diazotization. Theoptimal temperature and time were 30°C and 10 min. Azo adducts were determined at 430 nm.Methanol was found to be the best solvent. Gabapentin coupled at a ratio of 1:1 with DMAB. Theassays of GBP were linear over the range 1–6 μg/mL (r = 0.9973) and LOD of 0.8322 μg/mL. Themethods were accurate (error 2%) and precise (RSD .05). The successful diazotization of gabapentin and the azo adduct formation with DMABis reported for the first time.