Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities

Lan Yao; Long Xiong; Chang Geun Yoo; Chengyu Dong; Xianzhi Meng; Jun Dai; Arthur J. Ragauskas; Chunlei Yang; Jun Yu; Haitao Yang; Xiong Chen

doi:10.1039/D0SE00940G

Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities†

Lan Yao,

‡^ae Long Xiong,‡^b Chang Geun Yoo,

^c Chengyu Dong,^d Xianzhi Meng,

^e Jun Dai,^a Arthur J. Ragauskas,

^efg Chunlei Yang,^h Jun Yu,^h Haitao Yang*^b and Xiong Chen*^a

Author affiliations

* Corresponding authors

^a Key Laboratory of Fermentation Engineering (Ministry of Education), College of Bioengineering, Hubei University of Technology, 28th of Nanli Road, Wuhan 430068, China
E-mail: cx163_qx@163.com

^b Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, 28th of Nanli Road, Wuhan 430068, China
E-mail: pphtyang1979@aliyun.com

^c Department of Paper and Bioprocess Engineering, State University of New York, College of Environmental Science and Forestry, Syracuse, NY 13210, USA

^d Biomass Group, College of Engineering, Nanjing Agricultural University, 40 Dianjiangtai Road, Nanjing, Jiangsu 210031, China

^e Department of Chemical and Biomolecular Engineering, University of Tennessee Knoxville, Knoxville, TN 37996-2200, USA

^f Joint Institute for Biological Sciences, Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA

^g Department of Forestry, Wildlife and Fisheries, Center for Renewable Carbon, University of Tennessee Knoxville, Institute of Agriculture, Knoxville, TN 37996-2200, USA

^h Tobacco Research Institute of Hubei Province, 6 Baofeng Road, Qiaokou District, Wuhan 430030, China

Abstract

To understand the influence of lignin characteristics on their antioxidant activities, lignins were isolated from Broussonetia papyrifera by organosolv pretreatment at different temperatures. The physicochemical features of the lignins were investigated by GPC, ³¹P NMR and 2D HSQC NMR analyses. An increase of organosolv pretreatment temperature resulted in a decrease of M_w and an increase of the phenolic hydroxyl group content in the isolated lignin. The lignins extracted at higher organosolv pretreatment temperature showed higher antioxidant activity according to the IC₅₀ determined using DPPH and ABTS. The correlations between the physicochemical properties of organosolv lignins and their antioxidant activities were studied. The contents of phenolic hydroxyl groups, especially syringyl and guaiacyl, and double bonds in the C_α position had positive effects on the antioxidant activity of the lignins. On the other hand, M_w and aliphatic hydroxyl groups of the lignins exhibited negative correlations with the antioxidant activity.

Sustainable Energy & Fuels

Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities†

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Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities

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