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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Comparative study of organic solvent-soluble and water-soluble lipophilic extractives from wheat straw 2: spectroscopic and thermal analysis

Journal of Wood Science volume 48, pages 222–226 (2002)Cite this article

Abstract

As a continuing study of six organic solventsoluble lipophilic extractives and one water-soluble lipophilic extract from wheat straw, seven extracts were further compared using Fourier transform-infrared (FT-IR) analysis,1H and13C nuclear magnetic resonance (NMR) spectroscopy, and thermal analysis. In the FT-IR spectra of two-thirds chloroform/one-third methanol, methyltertbutyl ether (MTBE), hexane, petroleum ether, and dichloromethane extracts, a strong band at 1746cm−1 is indicative of the ester carbonyl of triglycerides or steryl esters or waxes, whereas the occurrence of carboxylic carbonyl of free fatty acids or resin acids at 1712–1719 cm−1 is verified in the spectra of two-thirds toluene/one-third ethanol and hot water extracts. Signals at 187.9,178.4, and 173.3 ppm in the13C NMR spectrum of MTBE extract correspond to carbonyl groups of resin acids, fatty acids, and fatty acid/steryl esters, respectively. All the extractives were to varying degrees thermally unstable at a temperature of about 200°C, and the melting temperature occurred at about 54°C.

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Authors and Affiliations

  1. The BioComposites Centre, University of Wales, L57 2UW, Bangor, UK

    Run Cang Sun & Jeremy Tomkinson

  2. State Key Laboratory of Pulp and Paper Engineering, College of Paper and Environment Engineering, South China University of Technology, 510640, Guangzhou, People's Republic of China

    Run Cang Sun

Authors
  1. Run Cang Sun
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  2. Jeremy Tomkinson
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Correspondence to Run Cang Sun.

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Sun, R.C., Tomkinson, J. Comparative study of organic solvent-soluble and water-soluble lipophilic extractives from wheat straw 2: spectroscopic and thermal analysis. J Wood Sci 48, 222–226 (2002). https://doi.org/10.1007/BF00771371

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  • DOI: https://doi.org/10.1007/BF00771371

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