The purpose of this study was to formulate and develop a stable water-in-oil (W/O) emulsions containing the extract of the green tea leaves. Abil®EM90 was used as an emulsifier and effects of emulsifier ratios were optimized to obtain a stable emulsion without adding any preservative. For this purpose, 25 formulations were formulated initially and were kept at 25°C to choose the desired formulations for further stability study. 4 formulations were selected to keep them at various storage conditions for 21 days. Finally, a formulation containing 5% Abil®EM90, 3% green tea extract and 16% liquid paraffin oil was selected as final formulation to be subjected to the stability studies of 28 days. Formulation was observed for any type of phase separation, color change and liquefaction at defined intervals. It was found that a formulation containing 5% Abil®EM90, 3% green tea extract and 16% liquid paraffin oil was the most desirable, stable formulation regarding its physical characterization, including viscosity of the emulsion. Hence, it could be imperative choice as skin product in the form of stable topical emulsion.
Key words: Green tea, Abil®EM90, formulation, emulsion, stability.
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