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Polymers 2018, 10(7), 727; https://doi.org/10.3390/polym10070727

Structural Characterization of Lignocresols from Transgenic and Wild-Type Switchgrass

1
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, No.159, Longpan Rd., Xuanwu District, Nanjing 210037, China
2
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Science, Qingdao 266101, China
*
Author to whom correspondence should be addressed.
Received: 20 May 2018 / Revised: 28 June 2018 / Accepted: 29 June 2018 / Published: 2 July 2018
(This article belongs to the Special Issue Lignin Polymers: Structures, Reactions and Applications)
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Abstract

Cafferic acid-O-methyltransferases (COMT) down-regulated transgenic and wild-type switchgrass were separated into lignocresols (LCs) and sugars by a phase separation method involving 72% sulfuric acid and cresol. The isolated LCs were characterized by FTIR, GPC, 1H NMR and 2D-HSQC to understand potential structural modification caused by transgenic engineering lignin or phase separation treatment. No significant changes were found in terms of molecular weights and the amount of incorporated p-cresols between transgenic and wild-type switchgrass LCs. However, the compositions, ratios of syringyl (S) units to guaiacyl (G) units, were changed significantly leading to decrease in S units and increase in G units for transgenic switchgrass LC. The benzodioxane structures and 5-hydroxyguaiacyl units were observed in the 2D-HSQC implied that 5-hydroxyconiferyl alcohol was incorporated into lignin as a result of COMT-down-regulation in the transgenic process. View Full-Text
Keywords: switchgrass; lignocresols; transgenic sample; structural characterization switchgrass; lignocresols; transgenic sample; structural characterization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ren, H.; Tian, W.; Shu, F.; Xu, D.; Fu, C.; Zhai, H. Structural Characterization of Lignocresols from Transgenic and Wild-Type Switchgrass. Polymers 2018, 10, 727.

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