Propolis organogel as a novel topical delivery system for
treating wounds
Drug Deliv, 2013 Dec 3
Context: Propolis has traditionally been used in curing
infections and healing wounds and burns. Objective: The aim of this study is to
formulate pluronic lecithin organogel of propolis to improve its availability
and antimicrobial activity.
Materials and methods: Different organogels were prepared by
using soybean lecithin, isopropyl palmitate, pluronic F127 and water. The
effect of quantity of lecithin and pluronic F127 and percentage of oil phase
was investigated. The organogels were evaluated for appearance, texture, pH,
drug content and viscosity. In vitro release studies were carried out using
cellophane membrane. Drug permeation through abdominal rat skin from organogels
that showed high % drug release was compared to that from propolis suspension
in distilled water. Finally, the antimicrobial activity of the selected
propolis formulation against different bacterial isolates was compared with
that of propolis suspension in water.
Results and discussion: Results showed
that all organogel formulations except the formula containing 10% pluronic
F127, showed acceptable physical properties. Drug content of organogel
formulations was in the range of 97.5-100.2%. The pH of the formulations was in
the range of 5.5-6.3 that suits the skin pH, indicating skin compatibility. The
viscosity was in the range of 5366-8984 cp. A significant decrease in drug
release from formulations was observed with increase in concentration of
lecithin and pluronic F127. Decreasing oil phase percentage to 20% w/w led to a
decrease in drug release from the formulation.
Conclusion: The formula containing 3% lecithin and 20%
pluronic F127 exhibited superior skin permeation and antimicrobial activity
over propolis suspension in water.
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