Original Articles: 2010 Vol: 2 Issue: 2
Novel application and spectrophotometric estimation of Melitracen HCl tablet dosage form using Niacinamide as hydrotropic solubilizing agent
Abstract
Various organic solvents like methanol, chloroform, alcohol, dimethyl formamide; acetonitrile,
hexane, acetone and carbon tetrachloride have been employed for solubilization of poorly watersoluble
drugs for spectrophotometric estimations. Drawbacks of organic solvents include higher
cost, toxicity and error in analysis due to volatility. Attempting to minimize these drawbacks,
three new, simple, accurate, environmental friendly, cost effective, safe, sensitive
spectrophotometric methods have been developed. The primary objective of the present
investigation was to employ these hydrotropic solutions to extract the drugs from their dosage
forms, precluding the use of costlier organic solvents. Ultraviolet absorption spectrophotometric
method for the estimation of poorly water soluble drugs like Melitracen HCl in pharmaceutical
formulations has been developed. Aqueous solubilities of this selected model drugs was to a
great extent (28 to 35 fold) in 5.0 M niacinamide solutions. The selected λmax for Melitracen
HCl were 286.5 nm respectively. The hydrotropic solutions used did not show any absorbance
above 306 nm, and therefore, no interference in the estimation was seen. The results of analysis
have been validated statistically, and by recovery studies.