CUTANEOUS TOLERANCE OF SEA BUCKTHORN OIL EMULSION

Abstract

Introduction: Sea buckthorn oil ( Hippophae rhamnoides L.) is medically used both externally and internally, but the external application is unsutable due to its liquid, lipophylic and highly colored nature. These difficulties could be overbriged by formulation of semisolid emulsion with sea buckthorn oil. Previous research on this formulation showed that it has higher wound healing potential then sea buckthorn oil, possesing enhanced structure of liquid crystals, stability and suitability for topical use. Aim: The aim of this investigation was to complete characterization of proposed emulsion, by testing its potential for causing skin irritation. Methods: The emulsion was prepared by standard emulsifying techniques using a combination of surfactants that form an enhanced structure of liquid crystals. Amount of 40% of sea buckthorn oil was incorporated. Since results of previous research on this formulation show wound healing effect on an animal model, we also tested skin tolerance of it on animal skin model. Evaluation was done by Draize test which measures level of skin changes of rabbit skin. Results: There was absence of edema or erythema type of irritation after 2h, 24h, 48h, 72h and 7 days of application of semisolid emuslion with sea buckthorn oil. Conclusion: This study confirmed that combination of the proposed ingredients is adequate and the concentrations of surfactants used to form stable emulsion were appropriate also for skin application. The proposed formulation of emulsion with sea buckthorn oil exerted percutaneous tolerance and could be safely applied on the skin. Key words: sea buckthorn oil, emulsion, topical use, irritation