title: Chemical composition of lipophilic extractives released during the hot water treatment of wheat straw.
abstract: Treatment of wheat straw with hot water at 80-95 degrees C for 0.5 h at pH 6.0-8.0 released 41.0-53.0% of the original lipophilic extractives. The chemical compositions of six lipophilic extractives were determined by GC on a medium-length high-temperature capillary column without derivatization, thus giving a method for direct determination of individual components of free fatty and resin acids, sterols, waxes, sterol esters, and triglycerides. The extracts contained 68.7-75.8% lipophilic substances, comprising mainly free fatty acids (25.8-48.4%), waxes (9.4-27.0%), sterols (4.1-8.0%), triglycerides (3.3-11.0%), and sterol esters (2.6-5.1%). Minor amounts of diglycerides (0.3-0.5%), resin acid (0.5-3.1%), and phenolic compounds (0.9-3.6%) were also quantitatively determined in the extractives.
authors.affiliation: State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China. bcs00a@bangor.ac.uk
authors.forename: R C
authors.initials: RC
authors.lastname: Sun
authors.forename: D
authors.initials: D
authors.lastname: Salisbury
authors.forename: J
authors.initials: J
authors.lastname: Tomkinson
mesh_terms: D002849:Chromatography, Gas; D005227:Fatty Acids / Q000032:analysis*; D006358:Hot Temperature; D007220:Industrial Waste; D010209:Paper; D010636:Phenols / Q000032:analysis*; D013261:Sterols / Q000032:analysis*; D014280:Triglycerides / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D005227:Fatty Acids; D007220:Industrial Waste; D010636:Phenols; D013261:Sterols; D014280:Triglycerides