Spectral characterization of eucalyptus wood

Carmen Mihaela Popescu*, Maria Cristina Popescu, Ghita Singurel, Cornelia Vasile, Dimitris S. Argyropoulos, Stefan Willfor

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

184 Citations (Scopus)

Abstract

The main difficulties in wood and pulp analyses arise principally from their numerous components with different chemical structures. Therefore, the basic problem in a specific analytical procedure may be the selective separation of the main carbohydrate-derived components from lignin due to their chemical association and structural coexistence. The processing of the wood determines some structural modification in its components depending on the type of wood and the applied procedure. Fourier transform infrared (FT-IR) spectrometry and X-ray diffraction have been applied to analyze Eucalyptus g. wood chips and unbleached and chloritebleached pulp. The differences between samples have been established by examination of the spectra of the fractions obtained by successive extraction (acetone extractives, acetone free extractive samples, hemicelluloses, and lignins) by evaluating the derivative spectra, band deconvolution, etc. The energy and the hydrogen bonding distance have been evaluated. The relationship between spectral characteristics and sample composition has been established, as well as the variation of the degree of crystallinity after pulping and bleaching. The integral absorption and lignin/carbohydrate ratios calculated from FT-IR spectra of the IR bands assigned to different bending or stretching in lignin groups are stronger in the spectrum of eucalyptus chips than those from brown stock (BS) pulp spectra because of the smaller total amount of lignin in the latter. FT-IR spectra clearly show that after chlorite bleaching the structure of the wood components is partially modified or removed. Along with FT-IR data, the X-ray results confirmed the low content of lignin in the pulp samples by increasing the calculated values of the crystalline parameters. It was concluded that FT-IR spectroscopy can be used as a quick method to differentiate Eucalyptus globulus samples.

Original languageEnglish
Pages (from-to)1168-1177
Number of pages10
JournalApplied Spectroscopy
Volume61
Issue number11
DOIs
Publication statusPublished - Nov 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Fourier transform infrared spectroscopy
  • FT-IR spectroscopy
  • Wood components
  • X-ray diffraction
  • XRDS

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