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oai:www.ideals.illinois.edu:2142/21531 2023-07-10 col_2142_5131 col_2142_14781 com_2142_5130 com_2142_687 com_2142_397

Perkins, Edward G. Mahungu, Symon Maina 2011-05-07T13:11:20Z 2011-05-07T13:11:20Z 10000-01-01 1994 Static headspace (HS) and capillary gas chromatography/infrared spectroscopy-mass spectrometry (GC/IR-MS) were used to collect, separate, identify and quantitate the oxidative and thermal decomposition products in heated triolein, trilinolein and esterified propoxylated glycerols (EPGs), EPG-08 oleate and EPG-08 linoleate. Approximately 4 L of each oil sample (triolein, trilinolein, EPG-08 oleate and EPG-08 linoleate) with and without added antioxidants were separately heated in a deep fat fryer at $\rm 190\sp\circ C$ for 12 h each day until each contained $\ge$20% polymeric material. The major volatile compounds in heated EPG-08 oleate and in heated triolein were heptane, octane, heptanal, octanal, (E)-2-decenal and (E)-2-undecenal. Heating EPG-08 oleate produced the volatile compounds butylcyclopentane, propylcyclohexane, 2-ethyl-4-methyl-1,3-dioxolane, 1-acetoxy-2-propanone, 2,2,4-trimethyl-1,3-dioxolane, 1,2-propanediol, 2-heptyl-4-methyl-1,3-dioxolane, and 4-methyl-2-octyl-1,3-dioxolane which are unique to EPG-08 oleate. The major volatile compounds in heated EPG-08 linoleate and in heated trilinolein were pentane, hexanal, (E)-2-heptenal, 2-pentylfuran, (E)-2-octenal, 1-octen-3-ol and (E,E)-2,4-decadienal. The identified volatile compounds from heated EPG-08 linoleate are those generally expected from the oxidative and thermal decomposition of linoleates, except 1-acetoxy-2-propanone and 1-hydroxy-2-propanone, which are associated with the decomposition of the polyol backbone. Supercritical fluid extraction (SFE) was used in conjunction with capillary GC/IR-MS to extract, separate and identify volatile compounds in heated EPG-08 oleate and soybean oil. Most of the volatile compounds identified in soybean oil are associated with the oxidative and thermal decomposition of linoleic acid. The volatile compounds identified in heated EPG-08 oleate were similar to those identified using HS-GC/IR-MS. Made available in DSpace on 2011-05-07T13:11:20Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9503265.pdf: 7325788 bytes, checksum: fc7d75f7978a0a1163d398576a2ca5d4 (MD5) Previous issue date: 1994 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:51:25Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:23:35-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9503265 (UMI)AAI9503265 http://hdl.handle.net/2142/21531 eng Copyright 1994 Mahungu, Symon Maina Agriculture, Food Science and Technology Chemistry, Analytical Analysis of the volatile components of heated esterified propoxylated glycerols text Food Science and Human Nutrition Food Science and Human Nutrition University of Illinois at Urbana-Champaign Dissertation Ph.D.