Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 1, Pages 580-587Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01955
Keywords
Lignin fractionation; Organosolv lignin; Antioxidant activity; Molecular weight; Acetone:water mixture
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Funding
- U.S. DOE (Department of Energy), EERE (Energy Efficiency and Renewable Energy), BETO (Bioenergy Technology Office) [DE-EE0006112]
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Lignin fractions with different molecular weight were prepared using a simple and almost green method from switchgrass and pine organosolv lignin. Different proportions of acetone in water, ranging from 30 to 60%, were used for lignin fractionation. A higher concentration of acetone dissolved higher molecular weight fractions of the lignin. Fractionated organosolv lignin showed different molecular weight and functional groups. Higher molecular weight fractions exhibited more aliphatic and less phenolic OH than lower molecular weight fractions. Lower molecular weight fractions lead to more homogeneous structure compared to samples with a higher molecular weight. All fractions showed strong antioxidant activity.
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