Abstract
Objective: Objective of the study was to evaluate the effect of Tween 80, palm kernel oil (PKO), and its conversion products (hydrolyzed and transesterificated products) on the in vitro rabbit skin penetration of indomethacin from hydrocarbon ointment base.Materials and Methods: In vitro penetration of indomethacin through hairless rabbit skin from hydrocarbon ointment base (white petrolatum) was evaluated using a diffusion cell. The effects of Tween 80, PKO, and its conversion products at various concentrations were evaluated.Results: The higher of the concentration of Tween 80 until 5%, the higher of the indomethacin penetration. However, at the concentration above 5%, the penetration was decreased with the increasing concentration of Tween 80 used. The amount of indomethacin penetrated increased with the increasing of the concentration of PKO and its conversion products used. Hydrolyzed product showed the higher indomethacin penetration enhancing effect than PKO. Transesterificated product showed the highest penetration enhancing effect. However, the combination of Tween 80 with transesterificated product showed lower penetration enhancing effect compared to transesterificated product only.Conclusion: Tween 80 at low concentrations, PKO, and its conversion products could be used to enhance indomethacin penetration.
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