Dehydrogenative polymerization of coniferyl alcohol in artificial polysaccharides matrices: Effects of xylan on the polymerization

Qiang Li, Keiichi Koda, Arata Yoshinaga, Keiji Takabe, Masatsugu Shimomura, Yuji Hirai, Yutaka Tamai, Yasumitsu Uraki

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    To elucidate the influence of wood polysaccharide components on lignin formation in vitro, models for polysaccharide matrix in wood secondary cell wall were fabricated from two types of bacterial cellulosic films, flat film (FBC) and honeycomb-patterned film (HPBC), as basic frameworks by depositing xylan onto the films. An endwise type of dehydrogenative polymerization,"Zutropfverfahren", of coniferyl alcohol was attempted in the films with/without xylan. The resultant dehydrogenation polymer (DHP) was generated inside and outside xylan-deposited films, whereas DHP was deposited only outside the films without xylan. The amount of the generated DHP in the xylan-deposited films was larger than that in the films without xylan. The frequency of 8-O-4′ interunitary linkage in DHP was also increased by the xylan deposition. These results suggest that xylan acts as a scaffold for DHP deposition in polysaccharides matrix and as a structure regulator for the formation of the 8-O-4′ linkage. In addition, mechanical properties, i.e., tensile strength and modulus of elasticity (MOE), of both cellulosic films were found to be augmented by the deposition of xylan and DHP. Especially, DHP deposition remarkably enhanced MOE. Such effects of xylan on DHP formation and augmentation of mechanical strength were clearly observed for HPBC, revealing that HPBC is a promising framework model to investigate wood cell wall formation in vitro.

    Original languageEnglish
    Pages (from-to)4613-4620
    Number of pages8
    JournalJournal of Agricultural and Food Chemistry
    Volume63
    Issue number18
    DOIs
    Publication statusPublished - 2015 May 13

    Keywords

    • 8- O -4′ linkage
    • dehydrogenation polymer
    • honeycomb-patterned bacterial cellulose film
    • mechanical property
    • xylan

    ASJC Scopus subject areas

    • Agricultural and Biological Sciences(all)
    • Chemistry(all)

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