Abstract
Abstract In this work, a novel on-line process for production of emulsions containing essential oils from saponin-rich pressurized aqueous plant extracts in one step was developed. Named by our research group as Emulsion from Pressurized Liquid Extraction (EPLE) the feasibility of this process was demonstrated under optimum PLE conditions (12 MPa, temperature of 393 K and 10 min of static time) using Pfaffia glomerata roots as source of saponin-rich extract, water as extracting solvent and clove essential oil as a model dispersed phase. The optimization study of PLE was performed with extraction pressure (12 MPa), temperature (353-433 K) and static extraction time (5-15 min) as independent variables. Only the extraction temperature significantly influenced the extraction yield and extract emulsification index. As expected, the essential oil/aqueous solution (extract dissolved in water) ratio had a strong influence on the emulsion droplet size (d 32 ), and as this ratio is increased, the d
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