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Enhancement of the antioxidant abilities of lignin and lignin-carbohydrate complex from wheat straw by moderate depolymerization via LiCl/DMSO solvent catalysis.
- Source :
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International journal of biological macromolecules [Int J Biol Macromol] 2021 Aug 01; Vol. 184, pp. 369-379. Date of Electronic Publication: 2021 Jun 12. - Publication Year :
- 2021
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Abstract
- A facile and environmentally-friendly strategy for increasing antioxidant activity is a crucial issue for value-added lignin and lignin-carbohydrate complex (LCC) as alternative antioxidants. However, the antioxidant activities of lignin and LCC by the traditional solid-liquid extraction (SLE) methods were restricted by the relatively lower solubility induced from high molecular weight (Mw), and the less functional groups including, phenolic hydroxyl and carboxyl. To improve the antioxidantion of lignin and LCC, lithium chloride/dimethyl sulfoxide (LiCl/DMSO) solvent fractionation (LDSF) was conducted to increase the functional groups and reduce Mw, in which LiCl/DMSO acted triple roles as solvent, acid, and metal chloride catalyst for the depolymerization reaction synchronously. The β-O-4' linkages were cleaved to release the phenolic hydroxyl, resulting in decreasing Mw; the hydroxyl of the side-chain of lignin was oxidized into carboxyl. Thus, the lignin (LD-RL) and LCC (LD-LCC) samples from LDSF had a higher syringyl (S)/guaiacyl (G) ratio, phenolic hydroxyl, and carboxyl contents, but less Mw than control groups from SLE. Consequently, they presented more excellent scavenging rates toward DPPH and ABTS radicals, up to 90%. This work provided panoramic perspectives and basics of the green and convenient approach to isolate and modify lignin and LCC for great antioxidantion with LDSF.<br /> (Copyright © 2021. Published by Elsevier B.V.)
- Subjects :
- Antioxidants chemistry
Catalysis
Chemical Fractionation
Dimethyl Sulfoxide chemistry
Drug Stability
Green Chemistry Technology
Lignin chemistry
Lithium Chloride chemistry
Thermodynamics
Antioxidants pharmacology
Carbohydrates chemistry
Lignin pharmacology
Solvents chemistry
Triticum chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1879-0003
- Volume :
- 184
- Database :
- MEDLINE
- Journal :
- International journal of biological macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 34126153
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2021.06.063