TCHINDA SONWA Eliane; YOUASSI YOUASSI Olivier; TCHOUMBOUGNANG François;
Essential oils (EOs) are rich in bioactive compounds. However, their volatile and insoluble characteristics in water make their uses problematic. However, their nanoformulations are likely to stabilize and protect the active molecules they contain. The cold method of Prinderre and coll. (1998) was used for the formulation of nanoemulsions (NEs) of EOs from Mondia whitei and Zingiber officinale. The proportions 5/5/90 respectively for EO, surfactant and water were used with tween 80 as surfactant. The characterization of the NEs formulated was carried out by laser granulometry. It appears that the nanoemulsion of the essential oil of Mondia whitei (NEMW) is white, milky while that of Zingiber officinale (NEZO) is white, milky with a translucent tendency leaving a bluish reflection on the walls of a glass bottle transparent. Furthermore, the particle size distribution curves obtained show that NEZO has a single peak indicating a single population of particles, therefore the average size is 192 nm. On the other hand, that of the NEMW presents 3 peaks indicating three populations of droplets therefore the average size is 30.329µm. Due to its stability and the best characteristics it exhibits, the EO nanoemulsion of Z. officinale is more suitable than that of M. whitei. Its use can thus be optimized in various fields, in particular that of the preservation of foodstuffs.
Keywords: Formulation; nanoemulsion; essential oils; laser granulometry.