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Open AccessArticle

Structural Characterization and Antioxidant Activity of Milled Wood Lignin from Xylose Residue and Corncob

1
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China
2
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Guangxi University, Nanning, Guangxi 530004, China
3
Beijing Key Laboratory of Lignocellulosic Chemistry/MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(12), 2092; https://doi.org/10.3390/polym11122092
Received: 10 November 2019 / Revised: 6 December 2019 / Accepted: 12 December 2019 / Published: 13 December 2019
(This article belongs to the Special Issue Properties, Applications and Perspectives of Lignin)
Xylose residue (XR), after diluted acid treatment of corncob, consists of cellulose and lignin. However, structural changes of XR lignin have not been investigated comprehensively, and this has seriously hindered the efficient utilization of lignin. In this study, corncob milled wood lignin (CC MWL), and xylose residue milled wood lignin (XR MWL) were isolated according to the modified milled wood lignin (MWL) method. The structural features of two lignin fractions were thoroughly investigated via fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), thermogravimetric analysis (TGA) and two dimensional nuclear magnetic resonance (2D NMR) spectroscopy techniques. XR MWL with higher yield and lower bound carbohydrate contents presented more phenolic OH contents than CC MWL due to partial cleavage of β-O-4. Furthermore, the molecular weights of XR MWL were increased, possibly because of condensation of the lignin during the xylose production. A study on antioxidant activity showed that XR lignin had better radical scavenging ability than that of 2,6-Di-tert-butyl-4-methyl-phenol (BHT) and CC MWL. The results suggested that the lignin in xylose residue, showing great antioxidant properties, has potential applications in food additives. View Full-Text
Keywords: lignin; characterization; antioxidant activity; corncob; HSQC lignin; characterization; antioxidant activity; corncob; HSQC
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MDPI and ACS Style

Xu, M.; Wang, C.; Lyu, G.; Zhong, L.; Yang, L.; Wang, Z.; Qin, C.; Ji, X.; Yang, G.; Chen, J.; Xu, F. Structural Characterization and Antioxidant Activity of Milled Wood Lignin from Xylose Residue and Corncob. Polymers 2019, 11, 2092.

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