Authors: Run Cang Sun Jeremy Tomkinson
Publish Date: 2002/06
Volume: 48, Issue: 3, Pages: 222-
Abstract
As a continuing study of six organic solventsoluble lipophilic extractives and one watersoluble lipophilic extract from wheat straw seven extracts were further compared using Fourier transforminfrared FTIR analysis1H and13C nuclear magnetic resonance NMR spectroscopy and thermal analysis In the FTIR spectra of twothirds chloroform/onethird 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 twothirds toluene/onethird ethanol and hot water extracts Signals at 18791784 and 1733 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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