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  • Bao-Cheng Zhao
    Beijing Forestry University
  • Bo-Yang Chen
    Beijing Forestry University
  • Sheng Yang
    Beijing Forestry University
  • Tong-Qi Yuan
    Beijing Forestry University
  • Adam Charlton
  • Run-Cang Sun
    Beijing Forestry University
Milled wood lignin (MWL), lignin−carbohydrate complex-rich fraction (LCC-AcOH), celluloytic enzyme lignin (CEL), and enzymatic hydrolysis residue (EHR) were sequentially isolated from Eucalyptus grandis × E. urophylla
under mild conditions, and the variations of lignin−carbohydrate complex (LCC) linkages and lignin structures during the eucalyptus growth were investigated. The 2D HSQC NMR analysis showed that β-O-4′ and β−β′ were the main
linkages in lignin, while other substructures were present in much lower amounts. The amounts of β-O-4′ in the MWL and LCC-AcOH fractions showed an increased tendency and those in the CEL and EHR fractions had no obvious variation with the eucalyptus growth. The S/G ratios of the MWL, LCC-AcOH, and CEL fractions increased first and then decreased, whereas those of the EHR fractions decreased with the tree age. The amount of phenyl glycoside (PhGlc) in the LCC-AcOH fractions varied consistent with the S/G ratio. The variation of the amount of benzyl ether (BE) in the MWL fractions was parallel to the
S/G ratio, while that in the CEL fractions was contrary to it. These findings will provide some evidence for the structural variation of lignin and LCC in Eucalypt during its growth process.
Original languageEnglish
Pages (from-to)1113-1122
JournalACS Sustainable Chemistry & Engineering
Volume5
Issue number1
Early online date18 Nov 2016
DOIs
Publication statusPublished - 2017

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