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Characteristic fragment ions from lignin and polysaccharides in ToF–SIMS

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Abstract

Different model compounds for lignin, hemicelluloses and pectins were studied by time-of-flight secondary-ion mass spectrometry (ToF–SIMS). Mass spectra of Klason lignin from normal and compression spruce wood, aspen wood and wheat straw were compared. Spectra of brominated spruce and aspen wood sections showed fragment ions attributed to brominated guaiacyl and syringyl units in lignin at m/z 215, 217, 229 and 231, and m/z 245, 247, 249 and 261, respectively. Spectra of mono-, oligo- and polysaccharides showed fragment ions at m/z 127 and 145 characteristic for hexose units, and ions at m/z 115 and 133 characteristic for pentose units. The same ions were detected in spectra of delignified spruce and aspen wood sections. Labelling of anionic groups by Sr2+ ions followed by ToF–SIMS analysis showed that pectins were present at specific locations on the surfaces of spruce and aspen wood sections still after delignification with hydrogen peroxide in acetic acid.

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Abbreviations

AFM:

Atomic force microscopy

CW:

Compression wood

G:

Guaiacyl

H:

p-Hydroxyphenyl

MWL:

Milled wood lignin

NW:

Normal wood

SEM–EDXA:

Scanning electron microscopy–energy-dispersive X-ray analysis

S:

Syringyl

ToF–SIMS:

Time-of-flight secondary-ion mass spectrometry

XPS:

X-ray photoelectron spectroscopy

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Acknowledgments

We thank Top Analytica Ltd. for providing instrumental facilities for this work. This work is part of the activities at the Åbo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Programme (2006–2011) by the Academy of Finland.

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Authors and Affiliations

  1. Laboratory of Wood and Paper Chemistry, Process Chemistry Centre, Åbo Akademi University, Turku, Åbo, Finland

    Elena N. Tokareva, Andrey V. Pranovich & Bjarne R. Holmbom

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  1. Elena N. Tokareva
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  2. Andrey V. Pranovich
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  3. Bjarne R. Holmbom
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Correspondence to Elena N. Tokareva.

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Tokareva, E.N., Pranovich, A.V. & Holmbom, B.R. Characteristic fragment ions from lignin and polysaccharides in ToF–SIMS. Wood Sci Technol 45, 767–785 (2011). https://doi.org/10.1007/s00226-010-0392-9

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