Selected Essential Oils as Natural Ingredients in Cosmetic Emulsions: Development, Stability Testing and Antimicrobial Activity

Abstract: Background: Essential oils are currently the subject of intensive scientific study, and their potential as active medicinal compounds or natural preservatives has attracted attention cosmetic pharmaceutical industries. Objectives: The objectives present study were: to develop a emulsion based on different concentrations synthetic preservative essential oils, applied preservatives; evaluate subsequently compare stability antimicrobial activity. Materials Methods: Various samples were prepared using methylparaben, well. fresh evaluated immediately after preparation related organoleptic physicochemical testing. behavior light tests, accelerated microbiological tests well performed for four weeks storage. Results: During test, formulations loaded with 2% not stable was noted variation in color liquefaction second week storage at 40°C; rheological showed significant decrease viscosity, varying from 4890±34.7 3720±37.9. For all samples, pH levels within physiological skin range, it varied 6.01±0.33 6.92±0.19. self-preserving activity emulsions satisfactory. Conclusion: Cosmetic concentration 1% promising stability, physico-chemical characteristics, selfpreserving properties, conditions. provide novel alternative preservation “paraben-free” products. Keywords: emulsion, Methylparaben, Formulation, Stability testing, Self-preserving