Journal
COMPTES RENDUS CHIMIE
Volume 21, Issue 6, Pages 563-571Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crci.2018.01.010
Keywords
Lignin; NaDES; GVL; Ultrasound; Microwaves; Antioxidant activity
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Funding
- H2020 Project US4GREENCHEM by the BBI-JU [669055]
- H2020 Societal Challenges Programme [669055] Funding Source: H2020 Societal Challenges Programme
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Two bio-based solvents, natural deep eutectic solvents (NaDESs) and gamma-valerolactone (GVL), have been used under microwave (MW), and ultrasound (US) irradiation to design an efficient and sustainable process for wheat straw delignification and have been compared with the traditional alkali procedure. Best delignification (45%) was achieved with a three-component NaDES (lactic acid/glycerol/choline chloride) under MW irradiation (at 120 degrees C in 30 min), with solid/liquid ratio of 1:50. A GVL/water mixture (8:2) also gave an efficient delignification (27%) under US irradiation (40 kHz, 200 W) at 50 degrees C for 60 min. Analytical pyrolysis (Py) coupled with GC/MS/FID, provides valuable information on the extracts' chemical profile. DPPH and Folin-Ciocalteu tests highlighted the efficiency of MW- and US-assisted extraction as well as the extracts quality. The highest antioxidant activity for the NaDES extracts was obtained under US irradiation. (C) 2018 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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