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Research article - Peer-reviewed, 2014

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

Gao, Jie; Kim, Jongsik; Terziev, Nasko; Allegretti, Ottaviano; Daniel, Geoffrey; Kim, Jong Sik

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.

Keywords

compound middle lamella (CML); hemicelluloses; immunocytochemistry; pectin; thermal modification (TM); thermally modified wood (TMW); transmission electron microscopy (TEM)

Published in

Holzforschung
2014, Volume: 68, number: 7, pages: 849-859

      SLU Authors

    • Gao, Jie

      • Department of Forest Products, Swedish University of Agricultural Sciences
      • Kim, Jongsik

        • Department of Forest Products, Swedish University of Agricultural Sciences
        • Terziev, Nasko

          • Department of Forest Products, Swedish University of Agricultural Sciences
          • Daniel, Geoffrey

            • Department of Forest Products, Swedish University of Agricultural Sciences

          Associated SLU-program

          Forest

          UKÄ Subject classification

          Wood Science

          Publication identifier

          DOI: https://doi.org/10.1515/hf-2013-0221

          Permanent link to this page (URI)

          https://res.slu.se/id/publ/52159