The analysis of the non-volatile components of heated fatty acid esterified propoxylated glycerols
Hansen, Steven Lee
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/22110
Description
Title
The analysis of the non-volatile components of heated fatty acid esterified propoxylated glycerols
Author(s)
Hansen, Steven Lee
Issue Date
1995
Doctoral Committee Chair(s)
Artz, William E.
Department of Study
Food Science and Human Nutrition
Discipline
Food Science and Human Nutrition
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Food Science and Technology
Language
eng
Abstract
"EPG-08 oleate, triolein, EPG-08 linoleate and trilinolein, with and without antioxidants, were heated separately in a deep-fat-fryer at 190$\sp\circ$C for 12 hr/day until the polymer content was $\ge$ 20%. EPG-08 oleate (modified low-to-noncaloric triacylglycerol (TAG)) reached 20% polymer formation after 33.0 hr, triolein (normal TAG) after 51.1 hr, EPG-08 linoleate (modified TAG) after 21.4 hr, trilinolein (normal TAG) after 22.8 hr, EPG-08 oleate with antioxidant after 22.8 hr, triolein with antioxidant after 32.2 hr, EPG-08 linoleate with antioxidant after 19.9 hr and trilinolein with antioxidant after 16.7 hr. All of the oils showed increases in % polymer, free fatty acids, total acids, total aldehydes, food oil sensor readings, and red and yellow color during heating, while peroxides decreased. Heated oils, with antioxidants, were fractionated with supercritical carbon dioxide into relatively pure (approximately 85%) monomeric and dimeric TAG fractions for further analysis. $\sp{13}$C nuclear magnetic resonance (NMR) analysis of fractionated dimer TAG samples indicated peaks at 107-108, 67-68 and 23.8 ppm, which were distinct from monomer TAG. These peaks were present in both the ""normal"" and ""modified"" oil samples indicating the presence of the polyol backbone was not necessarily for the formation of dimer bonds between TAG molecules. Thus, it would appear that dimers formed in the fatty acid portion of the molecule as opposed to the polyol portion, however, the exact location could not be determined from NMR. Gas chromatography/mass spectrometry (GC/MS) of the fractionated dimeric fatty acid methyl ester indicated that the fatty acid portion of the molecule was involved in dimer formation for both the ""normal"" and ""modified"" oils. Supercritical fluid chromatography (SFC) of EPG-08 oleate with antioxidant indicated that the % fatty acid methyl ester (FAME) concentration decreased 20% from day 0 to day 2 (24 hr) relative to the polyol concentration, while the polyol concentration decreased 11% for the same period. The % FAME concentration for EPG-08 linoleate decreased 25% from day 0 to day 2 (24 hr), while the polyol concentration increased relative to the FAME concentration. The polyol concentration increased due to the loss of volatiles through FA decomposition."
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
