Ultrasonication as a highly efficient method of flaxseed mucilage extraction

• Published in: Industrial crops and products Vol. 65; pp. 354 - 360
• Main Authors: Fabre, Jean-François, Lacroux, Eric, Valentin, Romain, Mouloungui, Zéphirin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2015; Elsevier
• Subjects: Chemical engineering; Chemical Sciences; Flaxseed; Intrinsic viscosity; Microwave; Mucilage; Ultrasound; Microwave; Flaxseed; Mucilage; Ultrasound; Intrinsic viscosity
• ISSN: 0926-6690; 1872-633X
• DOI: 10.1016/j.indcrop.2014.11.015

•A comparison between three methods of flaxseed mucilage extraction is proposed.•Ultrasound-assisted extraction is more efficient than magnetic stirring or microwaves.•The kinetic parameters of the ultrasound assisted extraction are elucidated.•Increasing ultrasound amplitude decreases viscosity of extracted mucilage.•Ultrasonic treatment has a limited impact on protein content. Three methods of aqueous extraction of flaxseed mucilage (magnetic stirring, microwaves and ultrasounds) were compared and tested, from whole flaxseeds at a concentration of 5% (w/v) and a temperature of 50°C. While microwaves are less efficient than a magnetic stirring, ultrasound-assisted extraction showed the highest mass transfer coefficient and a higher order kinetic. 7% of the seed mass were extracted after only 30min of treatment. Ultrasound assisted extraction decreases the intrinsic viscosity of the mucilage from 12.5dL/g (for magnetic stirring) to 6.2dL/g, and the weight-average molecular weight of the largest polysaccharides from 1.5×106Da to 0.5×106Da, whilst having a limited impact on protein content and monosaccharide composition.