Antioxidant activities of lignin extracted from sugarcane bagasse via different chemical procedures
2012
Li, Zhili | Ge, Yuanyuan
Lignin was extracted from sugarcane bagasse via different chemical procedures with ethanol and alkaline solutions. The products (EL, AL) were characterized by UV, FT-IR, ¹³C NMR, TGA, GPC and potentiometric titration. The results indicated AL had more phenolic hydroxyl (PhOH) and methoxyl groups (OCH₃), and larger molecular mass and better thermal stability than EL. The lignins were further evaluated as potential antioxidants. The results demonstrated the radical scavenging activity (RSA) of AL was 79.0%, 91.3% higher than EL at the concentration of 300mgL⁻¹. The stronger antioxidant activity of AL was due to its higher quantities of PhOH and OCH₃ groups.
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