Investigation in solid–liquid extraction: Influence of ultrasound

Author(s): Romdhane M, Gourdon C


The extraction of active principles or oils from vegetable products by means of an appropriate solvent is a classical unit operation in chemical engineering. The aim of the present work is to improve the yield or the selectivity of the extraction using ultrasound. Two solid–liquid extractions have been investigated: pyrethrines from pyrethrum flowers (Chrysanthemum cineraria) and oil from woad seeds (Isatis tinetoria). In the case of the first one, an acceleration of the kinetics and of the yield of the extraction has been obtained, probably linked to the increase of the intraparticular diffusion of the solute, which is the limiting step of mass transfer. On the other hand, ultrasound seems to have a weak effect in the case of woad seeds, probably because of the structure of the seeds. In order to distinguish the various effects acting on the ultrasound activation, a thermoelectric probe has been built for measuring the ultrasonic intensity profile. By this method, it is possible to investigate the influence of the presence of solid particles on the ultrasound wave propagation.

Similar Articles

Oil bodies and their associated proteins, oleosin and caleosin

Author(s): Frandsen GI, Mundy J, Tzen JT

The uses of ultrasound in food technology

Author(s): Mason TJ, Paniwnyk L, Lorimer JP

Handbook of Food Analysis Instruments

Author(s): Chemat F, Tomao V, Virot M

Pulsed Electric Fields

Author(s): Barbosa-Canovas GV, Pierson MD, Zhang QH, Schaffner DW

Pulsed electric field processing of foods: a review

Author(s): Jeyamkondan S, Jayas DS, Holley RA

Impact of pulsed electric field treatment on the recovery and quality of plant oils

Author(s): Guderjan M, Töpfl S, Angersbach A, Knorr D

Enhanced extraction of phenolic compounds from merlot grapes by pulsed electric field treatment

Author(s): Delsart C, Ghidossi R, Poupot C, Cholet C, Grimi N, et al.

Aqueous and enzymatic processes for edible oil extraction

Author(s): Rosenthal A, Pyle DL, Niranjan K

Enzymatic process for extracting oil and protein from rice bran

Author(s): Hanmoungjai P, Pyle DL, Niranjan K

Enzyme-assisted aqueous extraction of peanut oil

Author(s): Sharma A, Khare SK, Gupta MN