Optimization and validation of spectrophotometric determination of glucosamine in dosage Form with sodium 1,2-naphthoquinone-4-sulphonate

Abstract

The present study developed rapid, sensitive and simple optimized method using spectrophotometric technique for the determination of Glucosamine (GL) in dosage forms. The method was performed based on the reaction of GL with sodium 1,2-naphthoquinone-4-sulphonate (NQS) in alkaline medium in order to form an orangey-colored product to be measured at 451 nm. Method optimization was essential as many experimental parameters can influence the derivatization process in terms of its efficiency and reproducibility, such parameters are the reaction time, reaction temperature, NQS concentration, alkali concentration and solvents. The current study aimed to optimize and validate a spectrophotometric method using the reaction of GL with NQS for determining GL in dosage forms. We identified and optimized the factors that may affect derivatization efficiency and reproducibility of the procedure. We further compared the data of the proposed method with a reference method, and statistical comparison showed ultimate agreement without significant differences in the accuracy and precision. The developed method is convenient, accurate and cost-effective for routine studies if compared to HPLC and other common techniques.