Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 2, Pages 2591-2595Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b04070
Keywords
Lignin; Antioxidant; Free radical; Enzyme; Laccase
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Funding
- National Natural Science Foundation of China [21464002]
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The utilization of lignin is of high interest since it represents the most abundant polyphenol worldwide. For the application of lignin as a natural antioxidant more phenolic hydroxyl groups (Ph-OH) and lower molecular weight (M-w) are essential. Here, we proposed a green method based on enzymatic treatment of two lignins (alkaline lignin AL and hydrolysis lignin HL) with laccase, by which the structure, especially the Ph-OH contents and M-w of lignin, could effectively controlled. The antioxidant activity of the lignin was evaluated in vitro by DPPH center dot (1,1-diphenyl-2-picrylhydrazyl) radical scavenging ability. The mechanism of antioxidant activity improvement was also elucidated. As expected, the enzymatic treated lignin (HL-L1.0) with the highest Ph-OH content and lower M-w exhibited the strongest antioxidant activity (IC50 = 28.8 mu g/mL), which was even stronger than the commercial antioxidants BHT (3,5-di-tert-butyl-4-hydroxytoluene, IC50 = 38.2 mu g/mL) and BHA (3-tert-butyl-4-hydroxyanisole, IC50 = 56.3 mu g/mL). This study suggested that the enzymatic treatment was a green and effective way to obtain lignin derivatives that showed great potential for antioxidant applications.
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