caa a22 4500 465797377 CHVBK 20180323112042.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02540495 doi (NATIONALLICENCE)springer-10.1007/BF02540495 Analysis of vegetable oil volatiles by multiple headspace extraction [Elektronische Daten] [J. Snyder, T. Mounts] Quantitative determination of the volatiles produced from oxidized vegetable oils is an important indicator of oil quality. Five vegetable oils, low-erucic acid rapeseed, corn, soybean, sunflower and high oleic sunflower, were stored at 60°C for four and eight days to yield oils with several levels of oxidation. Peroxide values of the fresh oils ranged from 0.6 to 1.8 while those of the oxidized oils were from 1.6 to 42. Volatile analysis by the multiple headspace extraction (MHE) technique, which includes a pressure and time controlled injection onto the gas chromatography (GC) column (a chemically bonded capillary column), was compared with that obtained by static headspace gas chromatography (SHS-GC). Several volatile compounds indicative of the oxidation of polyunsaturated fatty acids from the vegetable oils were identified and measured by MHE; pure compounds of twelve major volatiles also were measured by MHE, and peak area was determined. Multiple extractions of the oil headspace provided a more reproducible measure of volatile compounds than was obtained by SHS-GC. Concentration of all volatiles increased with increased oxidation as measured by peroxide value of the oil. AOCS Press, 1990 Canola oil nationallicence corn oil nationallicence headspace nationallicence high oleic sunflower oil nationallicence oxidation nationallicence peroxide value nationallicence quantitation nationallicence soybean oil nationallicence static nationallicence sunflower oil nationallicence Snyder J. Vegetable Oil Research, Northern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1815 N. University Street, 61604, Peoria, IL, USA aut Mounts T. Vegetable Oil Research, Northern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1815 N. University Street, 61604, Peoria, IL, USA aut Journal of the American Oil Chemists' Society Springer-Verlag 67/11(1990-11-01), 800-803 0003-021X 67:11<800 1990 67 11746 https://doi.org/10.1007/BF02540495 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02540495 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Snyder J. Vegetable Oil Research, Northern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1815 N. University Street, 61604, Peoria, IL, USA aut NATIONALLICENCE 700 1- Mounts T. Vegetable Oil Research, Northern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1815 N. University Street, 61604, Peoria, IL, USA aut NATIONALLICENCE 773 0- Journal of the American Oil Chemists' Society Springer-Verlag 67/11(1990-11-01), 800-803 0003-021X 67:11<800 1990 67 11746 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer