Related Experiment Video
Updated: Oct 2, 2025
Ultrasonic-Assisted Extraction of Cannabidiolic Acid from Cannabis Biomass
Published on: May 27, 2022
Evaluation of Techniques for Intensifying the Process of the Alcoholic Extraction of Coffee Ground Oil Using
Tatiane Akemi Toda1, Ana Julia Morelli Santana1, Julieta Adriana Ferreira2
1Laboratório de Engenharia de Separações (LES), Departamento de Engenharia de Alimentos (ZEA), Universidade de São Paulo (USP), P.O. Box 23, Pirassununga 13635-900, Brazil.
Abstract:
Ultrasound-assisted extraction (UAE) and pressurized liquid extraction (PLE) techniques were evaluated and compared with conventional extraction for obtaining spent coffee ground oil (SCGO). The use of absolute ethanol (ET0) and hydrated ethanol (ET6) as solvents, two levels of SCG mass ratio:solvent, 1:4 (U4) and 1:15 (U15), and ultrasound powers of 0, 200, 400, and 600 W were tested. ET0 and U15 resulted in higher extraction yields of SCGO (YSCGO, 82%). A positive effect of sonication on YSCGO was observed only for condition U4. UAE resulted in defatted solids (DS) with higher apparent density values, corroborating the increase in the amount of smaller diameter particles due to sonication. The micrographs showed changes in the surfaces of the solids from the UAE and PLE, although the crystalline structures of the DS were not altered. UAE and PLE, compared to conventional extraction, did not allow significant gains in terms of YSCGO and, consequently, in the number of contact stages in an extractor configured in cross-currents.
