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Chemistry and Industry of Forest Products ›› 2014, Vol. 34 ›› Issue (1): 37-42.doi: 10.3969/j.issn.0253-2417.2014.01.007

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Analysis of the Association between Cellulose and Lignin by Carbon 13 Tracer Method with Cellulose Precursor

XIANG Song-ming, XIE Yi-min, YANG Hai-tao, YAO Lan   

  1. School of Pulp & Paper Engineering, Hubei University of Technology, Wuhan 430068, China
  • Received:2013-05-02 Online:2014-02-25 Published:2014-03-05

Abstract: In this paper, carbohydrate part of the lignin-carbohydrate complexes(LCC) in cell wall was labelled with 13C and traced with 13C NMR. Cellulose precursor, i.e., uridine diphoshphate glucose-[6-13C], was synthesized, and injected into a living ginkgo tree together with lignin inhibitor AOPP and exogenous lignin precursor. It is proved that uridine diphoshphate glucose-[6-13C] is a suitable precursor for selective 13C-enrichment of cellulose in a plant. The specifically 13C-enriched LCC was isolated from the newly formed xylem of ginkgo shoots. Then it was degraded by cellulase and hemicellulase. Thus the lignin-rich fractions,which were called enzyme-degraded LCC (EDLCC), were obtained. By determining their FT-IR and 13C NMR spectra, information confirms that the bonds between C6 position of glucose units in cellulose and α-carbons of lignin side chain are benzyl ether linkage.

Key words: cellulose, 13C isotopic tracer, 13C NMR, lignin-carbohydrate complexes, benzyl ether linkage

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