High performance thin layer chromatography qualitative densitometry as a sensitive method to assess shelf life of polyherbal formulations: A study on Hutabhugadi Churna.
BACKGROUND
Measuring chemical stability of polyherbal formulations is very challenging due to diversity in phytochemical composition. As there are no comprehensive guidelines for stability testing of herbal products, there is a need for a sensitive tool to detect how the quality of herbal products varies with time under the influence of environmental conditions.


OBJECTIVE
To validate the employability of high-performance thin layer chromatography (HPTLC) for real-time stability of Hutabhugadi Churna (HC).


METHODS
The chromatograms were developed using toluene/ethyl acetate/formic acid (10:5:1) and ethyl acetate/formic acid (10:1) as a mobile phase for chloroform and ethanolic extract, respectively. The plates were scanned under 254, 366, 540 (pre-derivatization) and 540 nm (post-derivatization). Samples were analyzed immediately after preparation and after 3(rd) and 6(th) months of storage. Alteration of fingerprint profiles from the initial pattern, in terms of number of peaks, was employed as diagnostic tools. Percentage variation in composition at given period was calculated.


RESULTS
HC is found to be stable at room temperature up to 1.3 months using the method of calculation of 10% degradation period employing slope and intercept values for the initial, 3(rd) and 6(th) months' deviation in number of bands. The data obtained were subjected to regression analysis in context to number of bands obtained. The curve was found to be linear with R(2) value of 0.89-0.96 supported by their tolerance range of 0.04-0.11.


CONCLUSIONS
The proposed model is a new logic with prospects to become working method for stability assessment of polyherbal formulations under controlled conditions.
Department of Pharmacognosy, SDM Centre for Research in Ayurveda and Allied Sciences, Udupi, Karnataka, India.
K N
KN
Sunil Kumar
Department of Botany, SDM College, Udupi, Karnataka, India.
Priyadarshini
P
Pushpendra
Department of Chemistry, SDM College, Udupi, Karnataka, India.
B S
BS
Holla
Department of Pharmacology, SDM Centre for Research in Ayurveda and Allied Sciences, Udupi, Karnataka, India.
B
B
Ravishankar
Department of Botany, SDM College, Udupi, Karnataka, India.
B
B
Yashovarma
Densitometry; high-performance thin layer chromatography; real-time stability; shelf life