Abstract
The objective of the work was to validate the high performance liquid chromatography for simultaneous determination of stability of madecassoside and asiaticoside in Centella asiatica (L.) Urb., Apiaceae, extract-loaded film forming polymeric dispersions. High performance liquid chromatography method was validated in five topics: linearity and range, limit of detection and limit of quantitation, specificity, precision, and accuracy. Results showed the method had a good linearity (R2>0.9990) in the range of 5–150μg/ml and specific. The limit of detection and limit of quantitation of madecassoside were 81 and 245ng/ml and asiaticoside were 21 and 64ng/ml, respectively. The percent relative standard deviation of intraday and interday precision were less than 1 and 3%, respectively. The accuracy presented as percent recovery was 101.54–103.29% for madecassoside and 100.39–102.58% for asiaticoside. This validated high performance liquid chromatography method was used to determine the stability of the formulation containing Centella asiatica extract. Centella asiatica extract-loaded film forming polymeric dispersions used Eudragit® RS 30D and Eudragit® RL 30D as film former, glycerin as plasticizer, and absolute ethanol as solvent and penetration enhancer. Three formulations with different ratio of Eudragit® RS 30D and Eudragit® RL 30D were prepared and stored for 90 days at 4°C, 25°C, and 40°C. Stability results showed that almost all of the formulations were unstable at 25°C and 40°C. Except, two of three formulations were stable at 4°C. However, the formulation was further developed to improve the stability of madecassoside and asiaticoside in the formulation.
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