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Efficient Acetylation of Xylans by Exploiting the Potassium Acetate Formed During the Alkaline Extraction

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Abstract

Isolation of hemicelluloses through alkaline extraction results in formation of salts, which usually necessitates additional salt removal steps. In this study, acetylation of xylans was studied without the removal of potassium acetate (KAc), a commonly produced salt during the alkaline extraction, to find a facile method to alter the hydrophilic characteristics of hemicelluloses. The acetylation reaction was carried out solely with acetic anhydride without any catalysts or solvents added. The weight gain and ATR–FTIR analyses verified the acetylation of xylans in the presence of KAc. A significant decrease in water solubility and moisture uptake was observed upon acetylation in the presence of KAc which is also accompanied by an increase in thermal stability, disclosing an easy, efficient and environmentally friendly method to obtain hydrophobically modified xylans without the use of toxic catalysts and costly salt purification steps.

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Acknowledgements

The present study was funded by METU Scientific Research Projects via Grant Number BAP-07-02-2014-007-191. The authors would like to acknowledge METU Central Laboratory for thermal degradation analysis.

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Authors and Affiliations

  1. Department of Chemical Engineering, Middle East Technical University, Ankara, 06800, Turkey

    Merve Akkus & Ufuk Bakir

  2. Department of Polymer Science and Technology, Middle East Technical University, Ankara, 06800, Turkey

    Necati Ozkan

  3. Central Laboratory, Middle East Technical University, Ankara, 06800, Turkey

    Necati Ozkan

  4. Department of Biotechnology, Middle East Technical University, Ankara, 06800, Turkey

    Ufuk Bakir

Authors
  1. Merve Akkus
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  2. Necati Ozkan
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  3. Ufuk Bakir
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Correspondence to Necati Ozkan or Ufuk Bakir.

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Akkus, M., Ozkan, N. & Bakir, U. Efficient Acetylation of Xylans by Exploiting the Potassium Acetate Formed During the Alkaline Extraction. J Polym Environ 26, 3397–3403 (2018). https://doi.org/10.1007/s10924-018-1221-8

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  • DOI: https://doi.org/10.1007/s10924-018-1221-8

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