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ARS Home » Plains Area » Fargo, North Dakota » Edward T. Schafer Agricultural Research Center » Sunflower and Plant Biology Research » Research » Publications at this Location » Publication #157080
Title: SPECTROSCOPIC INVESTIGATION OF THE BLOWING PROCESS OF SOYBEAN OIL

Author
item TENG, G - NORTH DAKOTA STATE UNIV.
item SOUCEK, M - NORTH DAKOTA STATE UNIV.
item VICK, BRADY
item SIMONSICK, JR, W - MARSHALL RES & DEV LAB
item SEN, A - MARSHALL RES & DEV LAB

Submitted to: Surface Coatings International
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/1/2003
Publication Date: 9/1/2003
Citation: TENG, G., SOUCEK, M.D., VICK, B.A., SIMONSICK, JR, W.J., SEN, A. SPECTROSCOPIC INVESTIGATION OF THE BLOWING PROCESS OF SOYBEAN OIL. SURFACE COATINGS INTERNATIONAL PART B. 2003. V. 86, B3. P. 221-229.

Interpretive Summary: Blown soybean oil was characterised by gas chromatography (GC), nuclear magnetic resonance spectroscopy (NMR), ultraviolet visible spectroscopy (UV-Vis), infrared spectroscopy (IR), electrospray ionization-Fourier transfer mass spectrometry (ESI-FTMS), and gel permeation chromatography (GPC). During the blowing process (in which a stream of oxygen is bubbled through the heated oil), transition of cis to trans and the conjugation of double bonds, cross-linking and the degradation of oils occurred concurrently. The disappearance of unsaturated fatty esters followed first order kinetics. The formation of carbon-carbon and ether linkages was observed with NMR. It was proposed that the formation of ether linkages occurred via three routes: 1) combination of radicals; 2) homopolymerisation of epoxide; and 3) hydroxyl addition to oxirane. Furthermore, the effect of the blowing process on the rheological behaviour of the oils was also observed, and blown oil exhibited a higher viscosity than bodied oil (ie heat polymerised in an inert atmosphere).

Technical Abstract: Blown soybean oil was characterised by gas chromatography (GC), nuclear magnetic resonance spectroscopy (NMR), ultraviolet visible spectroscopy (UV-Vis), infrared spectroscopy (IR), electrospray ionization-Fourier transfer mass spectrometry (ESI-FTMS), and gel permeation chromatography (GPC). During the blowing process (in which a stream of oxygen is bubbled through the heated oil), transition of cis to trans and the conjugation of double bonds, cross-linking and the degradation of oils occurred concurrently. The disappearance of unsaturated fatty esters followed first order kinetics. The formation of carbon-carbon and ether linkages was observed with NMR. It was proposed that the formation of ether linkages occurred via three routes: 1) combination of radicals; 2) homopolymerisation of epoxide; and 3) hydroxyl addition to oxirane. Furthermore, the effect of the blowing process on the rheological behaviour of the oils was also observed, and blown oil exhibited a higher viscosity than bodied oil (ie heat polymerised in an inert atmosphere).