Comparative Study of the Selectivity Power of Colorimetric Method over Chromatographic Methods for the Analysis of Valaciclovir Hydrochloride

BACKGROUND

Valaciclovir hydrochloride (VAL) is an essential antiviral prodrug utilized to cure various types of herpes. Analysis of VAL by different analytical techniques demonstrates a persuasive aspect that is favorable in quality control application.

OBJECTIVE

This study describes a comparison between colorimetric and chromatographic (RP-HPLC and TLC-densitometric) methods concerning selectivity and specificity for the determination of VAL in existence of all possible degradation products (alkali and acid-induced degradation products, namely aciclovir (ACI) and guanine (GUA), respectively) in their synthetic mixture and pharmaceutical formulations.

METHODS

Colorimetric method was accomplished by forming a highly colored complex with ferric hydroxamate reagent measured at 493 nm in concentration range (0.20-1.60 mg/mL). Both chromatographic methods were successfully applied using UV detection at 256 nm in concentration range (2.00-5.00 µg/mL) for RP-HPLC method and (10.00-900.00 ng/band) for TLC-densitometric method.

RESULTS

The linearity studies, regression equations, assay parameters, and validation sheet of the proposed colorimetric and chromatographic methods to determine VAL were obtained with highly acceptable values.

CONCLUSION

ICH guidelines were followed to validate the described methods and the statistical comparison regarding both accuracy and precision, and satisfactory results were accomplished.

HIGHLIGHTS

In this study, we configure a full comparative study between different analytical methods for the analysis of challengeable mixture containing the drug of interest VAL along with its degradation products, ACI & GUA.

Enhancement of the sensitivity of valacyclovir and acyclovir for their spectrofluorimetric determination in human plasma

Two rapid, simple and highly sensitive spectrofluorimetric methods have been developed and validated for determination of valacyclovir hydrochloride (VAC) and acyclovir (ACV).