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United States Department of Agriculture

Agricultural Research Service

Title: Analysis of regiospecific triacylglycerols in vegetable oils and animal fats by electrospray mass spectrometry

Author
item Lin, Jiann-Tsyh

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: September 20, 2007
Publication Date: November 26, 2007
Citation: Lin, J.T. 2007. Analysis of regiospecific triacylglycerols in vegetable oils and animal fats by electrospray mass spectrometry. International Symposium of Biocatalysis and Biotechnology.

Interpretive Summary: A method of identification of the location of fatty acid chains on the glycerol backbone of triacylglycerols in biological samples using mass spectrometry is reported. The method can avoid contamination in biological samples and thus a more accurate quantification can be obtained compared to that of the previous method. The method was used for olive oil analysis. The results showed that the saturated fatty acids were mostly located at the sn-1,3 positions of the glycerol backbone and unsaturated fatty acids were mostly located at the sn-2 position of the glycerol backbone.

Technical Abstract: A method of regiospecific analysis of triacylglycerols (TAG) in vegetable oils and animal fats is reported here using the electrospray ionization MS3 of TAG lithiated adducts. The fragment ions of the MS3 from the loss of fatty acids at the sn-2 position as alpha, Beta-unsaturated fatty acids were used for the regeospecific identification and quantification. The ratio of the regiospecific TAG, ABA and AAB, in a oil sample collected by HPLC can be determined by the ratio of the abundances of the fragment ions of [ABA + Li – ACOOH – B'CH=CHCOOH]+ and [AAB + Li – ACOOH – A'CH=CHCOOH]+. The method was used to analyze regiospecific TAG in extra virgin olive oil. The results showed that the saturated fatty acids, palmitic acid and stearic acid, were mostly located at the sn-1,3 positions and unsaturated fatty acids, oleic acid and linoleic acid, were mostly located at the sn-2 position.

Last Modified: 8/27/2014
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