scholarly journals The Effects on Lignin Structure of Overexpression of Ferulate 5-Hydroxylase in Hybrid Poplar1

2009 ◽  
Vol 150 (2) ◽  
pp. 621-635 ◽  
Author(s):  
Jaclyn J. Stewart ◽  
Takuya Akiyama ◽  
Clint Chapple ◽  
John Ralph ◽  
Shawn D. Mansfield
Keyword(s):  
Lignin Structure

FTIR Analysis of the Lignin Structure Changes of APMP Treated by Laccase and Laccase / Mediator System

2013 ◽  
Vol 734-737 ◽  
pp. 2089-2093
Author(s):  
Fan Liu ◽  
Yu Liu ◽  
Jia Chuan Chen ◽  
Zhen Wang
Keyword(s):  
Oxidative Degradation ◽  
No Oxidation ◽  
Side Chain ◽  
Content Increase ◽  
Hydroxyl Content ◽  
Structure Changes ◽  
Mediator System ◽  
Chromophoric Group ◽  
Laccase Mediator System ◽  
Lignin Structure

In this Paper the Two-Stage Method of Enzyme-Mild Acidic Hydrolysis was Adopted to Separate Lignin from the APMP and the Modified Pulp Samples.And then Analyze the Lignin Structure Changes of the Modified APMP Lignin by Laccase and LMS(laccase/mediator System). it was Found that no Oxidation Took Place on Carbohydrates in the LMS, and Lignin Cα Hydroxyl Oxidization Produce α Carbonyl and H2O2 Bleaching can also Oxidation of Lignin, make the Conjugate C = α Increase;the Syringyl Structure Hydroxyl Content Increase, the Lignin Structure Macromolecular Side Chain Fracturing; Laccase and LMS Oxidative Degradation Chromophoric Group Unsaturated C = O, which can Improve the Brightness of Pulp and Create Better Conditions for Unbleached Pulp.

scholarly journals Effect of Lignin on Bamboo Biomass Self-Bonding During Hot-Pressing: Lignin Structure and Characterization

BioResources ◽  
2015 ◽  
Vol 10 (4) ◽  
Author(s):  
Dong-Li Li ◽  
Jian-Quan Wu ◽  
Wan-Xi Peng ◽  
Wen-Fei Xiao ◽  
Jian-Guo Wu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Lignin Structure

scholarly journals Elucidating Tricin-Lignin Structures: Assigning Correlations in HSQC Spectra of Monocot Lignins

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 916 ◽  
Author(s):  
Wu Lan ◽  
Fengxia Yue ◽  
Jorge Rencoret ◽  
José del Río ◽  
Wout Boerjan ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Nmr Spectra ◽  
Model Compounds ◽  
Heteronuclear Correlation ◽  
Nmr Methods ◽  
Nuclear Magnetic ◽  
Lignin Structure

Tricin [5,7-dihydroxy-2-(4-hydroxy-3,5-dimethoxyphenyl)-4H-chromen-4-one] is a flavone that has been found to be incorporated in grass lignin polymers via 4′–O–β coupling. Herein, we investigated the tricin-lignin structure using nuclear magnetic resonance (NMR) methods by comparing the 1H–13C heteronuclear correlation (HSQC) NMR spectra of the isolated lignin with a series of dimeric and trimeric tricin-4′–O–β-ether model compounds. Results showed that the tricin moiety significantly affects the chemical shift of the Cβ/Hβ of 4′–O–β unit, producing peaks at around δC/δH 82.5–83.5/4.15–4.45, that differ from the Cβ/Hβ correlations from normal 4–O–β units formed solely by monolignols, and that have to date been unassigned.

scholarly journals Effects on Lignin Structure of Coumarate 3-Hydroxylase Downregulation in Poplar

2012 ◽  
Vol 5 (4) ◽  
pp. 1009-1019 ◽  
Author(s):  
John Ralph ◽  
Takuya Akiyama ◽  
Heather D. Coleman ◽  
Shawn D. Mansfield
Keyword(s):  
Lignin Structure

A review on lignin structure, pretreatments, fermentation reactions and biorefinery potential

2019 ◽  
Vol 271 ◽  
pp. 462-472 ◽  
Author(s):  
Vinoth Kumar Ponnusamy ◽  
Dinh Duc Nguyen ◽  
Jeyaprakash Dharmaraja ◽  
Sutha Shobana ◽  
J. Rajesh Banu ◽  
...  
Keyword(s):  
Lignin Structure

Bm Lignin Structure and Chemical Compositional Characteristics of Switchgrass

2012 ◽  
Vol 455-456 ◽  
pp. 1257-1260
Author(s):  
Jin Hua Yan ◽  
Hui Xia Xu ◽  
Yan Li ◽  
Xiang Hua Li
Keyword(s):  
Lignin Structure
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