Abstract:
The RP-HPLC methods was developed and validated for estimation of Withanolide A and
Withanoside IV. The RP-HPLC method has shown adequate separation of Withanolide A
and Withanoside IV as Marker and its herbal formulation. The separation was achieved on
a Phenomenax C18 (250mm X 4.6 mm i.d, 5 μm particle size) with an Methanol : Water
in the ratio of 60:40 v/v. The mobile phase at a flow rate of 1.5 ml/min, Injection volume
20 μl and wavelength of detection used was 237 nm. The retention time for Withanoside
IV and Withanolide A was obtained as 10.55±0.2min and 18.66±0.2min, respectively. The
linearity of the proposed method was investigated in the range of 2-12 μg/ml and 2-12
μg/ml for Withanolide A and Withanoside IV , respectively. Correlation coefficient was
0.9952 and 0.9997 for Withanolide A and Withanoside IV , respectively. The developed
method was validated as per ICH guideline, for its accuracy, precision, LOD & LOQ and
the results were found to be satisfactory, thus the method is specific, rapid and simple with
good for estimation of Withanolide A and Withanoside IV. These analytical methods are
also applicable in ordinary laboratories. It can also be adopted for quality control tests for
these markers in formulation.
