Encapsulation and Co-Precipitation Processes with Supercritical Fluids:Applications with Essential Oils

摘要

Essential oils have important commercial applications as preservatives and flavours, and more recently as naturalantimicrobial agents. These applications require a suitable formulation constituted by biodegradable compounds thatprotect the essential oil from degradation and evaporation at the same time that allows for a sustained release. Microcapsulesof biopolymers loaded with essential oils meet these requirements. Such microcapsules can be prepared with differentprocesses such as spray-drying, freeze-drying and coacervation, and supercritical fluids are an advantageous mediumfor this purpose. Some supercritical fluid-based precipitation processes have already been applied to produce these microcapsules.Amongst them, the results obtained with Particles from Gas Saturated Solutions (PGSS), PGSS-drying and ConcentratedPowder Form (CPF) processes are particularly promising. Recent developments in the preparation of formulationswith supercritical fluids include the preparation of liposomes and micelles, which can be suitable carriers for essentialoils.