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Cellulose and Pectic Polysaccharides

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As a cell matures, its cell wall specializes according to its type. For example, the...

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Updated: May 16, 2025

Comprehensive Compositional Analysis of Plant Cell Walls Lignocellulosic biomass Part I: Lignin

Comprehensive Compositional Analysis of Plant Cell Walls Lignocellulosic biomass Part I: Lignin

Published on: March 11, 2010

Comprehensive Structural Characterization of Wheat Bran Lignin.

Gijs van Erven^1,2, Romy J Veersma¹, Mirjam A Kabel¹

¹Laboratory of Food Chemistry, Wageningen University & Research, Bornse Weilanden 9, Wageningen 6708 WG, The Netherlands.

Journal of Agricultural and Food Chemistry

|April 5, 2025

Summary

Wheat bran lignin, a byproduct of flour production, has been structurally characterized. This lignin is rich in syringyl units and has a defined macromolecular structure, paving the way for its valorization.

Keywords:

HSQC NMR lignin lignocellulose fractionation pyrolysis-GC-MS wheat bran

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Last Updated: May 16, 2025

Comprehensive Compositional Analysis of Plant Cell Walls Lignocellulosic biomass Part I: Lignin

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Published on: March 11, 2010

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Published on: August 2, 2021

Comprehensive Compositional Analysis of Plant Cell Walls Lignocellulosic biomass Part II: Carbohydrates

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Published on: March 12, 2010

Area of Science:

Biomass valorization
Lignin chemistry
Agricultural byproducts

Background:

Wheat bran is a high-volume sidestream from wheat flour production.
Limited research exists on wheat bran lignin structure and properties.

Purpose of the Study:

To comprehensively characterize the structure of wheat bran lignin.
To provide insights for the valorization of wheat bran lignin.

Main Methods:

Sequential enzymatic starch and protein removal.
Mild γ-valerolactone organosolv extraction and purification.
Quantitative ¹³C-IS pyrolysis-GC-MS, HSQC NMR, alkaline SEC, and ³¹P NMR analyses.

Main Results:

Wheat bran lignin is enriched in syringyl subunits (S/G ~ 0.9) compared to wheat straw lignin.
It contains typical β-O-4 aryl ether linkages (84%) and lacks p-coumarate and tricin.
The lignin exhibits a macromolecular nature (Mw 6900 g/mol) with low phenolic hydroxyl content (1.6 mmol/g).

Conclusions:

Detailed structural characterization of wheat bran lignin was achieved.
Findings support the dedicated valorization of wheat bran lignin.
Understanding lignin structure aids in assessing dietary physiological effects.