A perspective on lignin effects on hemicelluloses dissolution for bamboo pretreatment

Published Date

30 December 2016, Vol.94:117–121, doi:10.1016/j.indcrop.2016.08.025

Short communication

Title 

A perspective on lignin effects on hemicelluloses dissolution for bamboo pretreatment

• Author 

• Xiaojuan Ma ^a,b,,
• Xin Zheng ^a
• Haiyang Yang ^a
• Hui Wu ^a
• Shilin Cao ^a,c
• Lihui Chen ^a
• Liulian Huang ^a,,

• aCollege of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
• bKey Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China, Qilu University of Technology, Jinan, 250353, China
• cState Key Lab of Pulp and Paper Engineering, South China University of Technology,Guangzhou, 510640, China

Received 28 March 2016. Revised 13 August 2016. Accepted 13 August 2016. Available online 23 August 2016.

Highlights

• •
  More hemicelluloses and lignin were observed on the exterior of the chips.
• •
  Hemicelluloses in interior part showed extremely low MW especially in the late stage of pretreatment.
• •
  Lignin coatings could resist the diffusion of degraded hemicelluloses fractions.
• •
  The limited hemicelluloses removal might be correlated with lignin migration.

Abstract

To further explore the factors that resist hemicelluloses degradation and release, the chemical composition and molecular weight (MW) in both the interior and exterior portions of the hydrothermally pretreated bamboo substrates were characterized. The chemical composition analysis showed that pretreatment made the lignin tend to accumulate on the exterior surface of the bamboo chips; and therefore gave rise to a large difference of lignin content between exterior and interior. Along with the degradation of hemicelluloses, the difference of hemicelluloses content in both the exterior and interior part became small. On the contrary, the hemicelluloses from the both exterior and interior portions had an invariable MW in the early stage of pretreatment; whereas, the difference of hemicelluloses MW between the exterior and interior part increased with the pretreatment continue, indicating low MW of hemicelluloses in the interior portion. Long time pretreatment promoted increasingly lignin covering on the surface of the chips; the lignin coatings might act as a hydrophobic layer blocking the access of the degraded hemicelluloses.

Keyword

• Hydrothermal pretreatment
• Hemicelluloses release
• Lignin
• Bamboo

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• ⁎ 
  Corresponding authors.

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