DERIVATIVE SPECTROPHOTOMETRIC METHOD FOR SIMULTANEOUS ESTIMATION OF VINBLASTINE SULFATE AND MOXIFLOXACIN HYDROCHLORIDE

Objective: To develop a simple, accurate and precise method for the simultaneous estimation of Moxifloxacin hydrochloride (MOX) and Vinblastine sulfate (VIN). Methods: The normal spectrum of VIN and MOX were converted to its second derivative spectrum and the amplitude minima of VIN and MOX were measured at 214 nm and 297 nm, respectively. MOX and VIN solution were simultaneously determined in 0.1M HCl at 297 nm and 214 nm. Results: The amplitude of MOX and VIN were found to be more distinct in 0.1M HCl with compared to water, methanol and 0.1M NaOH (order = 2 and Δλ=1). Linearity was obtained over the range 1-8 μg/ml and 3-24 μg/ml with a lower limit of quantitation of 1.7 μg/ml and 0.4 μg/ml for MOX and VIN, respectively. For each level of samples, inter- and intra-day precision (% RSD) was <2.1% and <2.3%for MOX and < 2.3 and <2.7 % for VIN, respectively. The mean recovery of MOX and VIN were in the range 99.98%-103.1%and 101.03%-104.3%, respectively. The developed method was validated as per ICH guidelines for parameters like linearity, accuracy, method precision, and ruggedness. Conclusion: The results obtained were well within the acceptable criteria. The method can be used for routine analysis of MOX and VIN.