Cellulose

, Volume 25, Issue 4, pp 2667–2679 | Cite as

Investigation of stability of branched structures in softwood cellulose using SEC/MALLS/RI/UV and sugar composition analyses

  • Yuko Ono
  • Ryunosuke Funahashi
  • Tsuguyuki Saito
  • Akira Isogai
Original Paper
  • 61 Downloads

Abstract

Size-exclusion chromatography using multi-angle laser-light scattering, refractive index, and ultraviolet absorption (SEC/MALLS/RI/UV) detection was applied to Japanese cedar (JC) and eucalyptus (E) powders after delignification (D), extraction with 4% NaOH (H), and acid hydrolysis (A), with different sequences of the D, H, and A treatments. All the delignified wood samples were dissolved in 8% (w/w) LiCl/N,N-dimethylacetamide (DMAc) after ethylenediamine pretreatment. The wood sample/LiCl/DMAc solutions were diluted to 1% (w/v) LiCl/DMAc and subjected to SEC/MALLS/RI/UV analysis. The cellulose molecules in the high-molar-mass (HMM) fractions of the eucalyptus samples, i.e., E-D, E-DHA, and E-ADH, were linear polymers with random coil conformations. In contrast, the cellulose molecules in the HMM fractions of the Japanese cedar samples, i.e., JC-D, JC-AD, JC-DHA, and JC-D-α-cellulose (prepared from JC-D by soaking in 17.5% NaOH), had branched structures. However, the JC-ADH HMM fraction contained no branched structures. The results of SEC/MALLS/RI/UV and neutral sugar composition analyses of the Japanese cedar samples showed the presence of chemical linkages between cellulose and glucomannan molecules through lignin or lignin fragments. The stability of the cellulose/glucomannan linkages in the Japanese cedar holocellulose was investigated based on the results for samples prepared using different sequences. The obtained results were consistent with those of SEC/MALLS/RI analysis of softwood acid-sulfite and kraft pulps; softwood kraft pulp has branched structures in the HMM fraction, whereas softwood acid-sulfite pulp has no such branched structures.

Keywords

Cellulose Glucomannan Acid hydrolysis Alkali extraction Delignification Branched structure 

Notes

Acknowledgments

This research was supported by Core Research for Evolutional Science and Technology (CREST, Grant number JPMJCR13B2) of the Japan Science and Technology Agency (JST). We thank Helen McPherson, Ph.D., from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Biomaterial SciencesThe University of TokyoBunkyo-ku, TokyoJapan

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