Home About Browse Search
Svenska


Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process

Gao, Jie and Jongsik, Kim and Terziev, Nasko and Allegretti, Ottaviano and Daniel, Geoffrey (2014). Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process. Holzforschung. 68:7, 849-859
[Journal article]

[img]
Preview
PDF
8MB

Official URL: http://dx.doi.org/10.1515/hf-2013-0221

Abstract

Silver fir and Norway spruce wood have been thermally modified (TMW) for 3-4 h at 160 degrees C, 180 degrees C, 200 degrees C, and 220 degrees C by means of the thermovacuum process (Termovuoto), and the ultrastructural and chemical changes in the compound middle lamella (CML), including the middle lamella cell corner (MLcc) regions (CMLcc), were investigated. Severe anatomical and histochemical changes were prominent above treatment temperatures of 200 degrees C; thus, woods treated at 220 degrees C for 4 h were in focus. Immunocytochemical studies showed that noncellulosic polysaccharides, such as pectin, xyloglucan, xylan, and mannan, were significantly degraded in CMLcc regions of TMWs. After treatment, the CMLcc regions were composed almost entirely of modified lignin with increased amounts of acidic groups. With cytochemical staining for lignin, many electron dense particulates were detected in the CMLcc regions of TMWs, indicating early degradation/alteration by the Termovuoto treatment.

Authors/Creators:Gao, Jie and Jongsik, Kim and Terziev, Nasko and Allegretti, Ottaviano and Daniel, Geoffrey
Title:Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process
Series/Journal:Holzforschung (1437-434X)
Year of publishing :2014
Volume:68
Number:7
Page range:849-859
Number of Pages:11
Publisher:De Gruyter
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Forest
ISSN:1437-434X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
Agrovoc terms:immunology, pectins, heat treatment, wood properties, abies alba, picea abies
Keywords:compound middle lamella (CML), hemicelluloses, immunocytochemistry, pectin, thermal modification (TM), thermally modified wood (TMW), transmission electron microscopy (TEM)
URN:NBN:urn:nbn:se:slu:epsilon-e-2831
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2831
Additional ID:
Type of IDID
Web of Science (WoS)000343112300015
ID Code:12209
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Products
Deposited By: SLUpub Connector
Deposited On:06 Aug 2015 13:23
Metadata Last Modified:11 Feb 2016 10:27

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits