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Advanced Formulation and Pharmacological Activity of Hydrogel of the Titrated Extract of C. Asiatica

Hong Soon-Sun    (Department of Pharmaceutics, College of Pharmacy, Seoul National University   ); Kim Jong-Ho    (Department of Pharmaceutics, College of Pharmacy, Seoul National University   ); Li Hong    (Department of Pharmaceutics, College of Pharmacy, Seoul National University   ); Shim Chang-Koo    (Department of Pharmaceutics, College of Pharmacy, Seoul National University  );
  • 초록

    Titrated extract of Centella asiatica (TECA) contains three principal ingredients, asiaticoside (AS), asiatic acid (AA), and madecassic acid (MA). These components are known to be clinically effective on systemic scleroderma, abnormal scar formation, and keloids. However, one problem associated with administration of TECA is its low solubility in aqueous as well as oil medium. In this study, various nonionic surfactants and bile salts as anionic surfactant were tested and screened for solubilizing TECA with a view to developing topical hydrogel type of ointment which is stable physicochemically, and has better pharmacological effects. When TECA was incorporated into various nonionic surfactant systems, labrasol had the most potent capacity for solubilizing TECA. In cases of bile salt systems, Na-deoxycholate (Na-DOC) had foremost solubilizing capacity, even more than labrasol. In differential scanning calorimetric study, the peaks of AA, MA, AS and Na-DOC disappeared at the coprecipitate of $1\%$ TECA and $1\%$ Na-DOC, suggesting the optimum condition of Na-DOC for solubilizing TECA. When the physicochemical stability of hydrogel containing this mixture was assessed, it was stable at room temperature for at least one month. Pharmacologically it significantly decreased the size of wound area at the $9^{th}$ day when applied to the wound area of rat dorsal skin. Taken together, solubility of TECA was dramatically improved by using non ionic and anionic surfactant systems, and Na-DOC was found to be the most effective solubilizer of TECA in formulating a TECA-containing hydrogel typed ointment. Moreover this gel was considered to be applicable to clinical use for wound healing effect.

  • 주제어

    Centella asiatica .   Asiatic acid .   Asiaticoside .   Madecassic acid .   Bile salt .   Hydrogel.  

  • 참고문헌 (19)

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