title: Microwave-assisted extraction of lignin from triticale straw: optimization and microwave effects.
abstract: Presently lignin is used as fuel but recent interests in biomaterials encourage the use of this polymer as a renewable feedstock in manufacturing. The present study was undertaken to explore the potential applicability of microwaves to isolate lignin from agricultural residues. A central composite design (CCD) was used to optimize the processing conditions for the microwave (MW)-assisted extraction of lignin from triticale straw. Maximal lignin yield (91%) was found when using 92% EtOH, 0.64 N H(2)SO(4), and 148 °C. The yield and chemical structure of MW-extracted lignin were compared to those of lignin extracted with conventional heating. Under similar conditions, MW irradiation led to higher lignin yields, lignins of lower sugar content, and lignins of smaller molecular weights. Except for these differences the lignins resulting from both types of heating exhibited comparable chemical structures. The present findings should provide a clean source of lignin for potential testing in manufacturing of biomaterials.
authors.affiliation: Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Ave., Montreal, Quebec, Canada H4P 2R2. fanny.monteil@cnrc-nrc.gc.ca
authors.forename: Fanny
authors.initials: F
authors.lastname: Monteil-Rivera
authors.forename: Guang Hai
authors.initials: GH
authors.lastname: Huang
authors.forename: Louise
authors.initials: L
authors.lastname: Paquet
authors.forename: Stéphane
authors.initials: S
authors.lastname: Deschamps
authors.forename: Chantale
authors.initials: C
authors.lastname: Beaulieu
authors.forename: Jalal
authors.initials: J
authors.lastname: Hawari
mesh_terms: D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D002523:Edible Grain / Q000737:chemistry* / Q000528:radiation effects*; D008031:Lignin / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects*; D008872:Microwaves; D008956:Models, Chemical; D035261:Plant Components, Aerial / Q000737:chemistry* / Q000528:radiation effects*; D011829:Radiation Dosage
chemical_list: D008031:Lignin