Distribution of the major fatty acids of human milk betweensn-2 andsn-1,3 positions of triacylglycerols |
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Authors: | Heikki Kallio Philippe Rua |
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Affiliation: | (1) Department of Biochemistry and Food Chemistry, University of Turku, FIN-20500 Turku, Finland |
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Abstract: | Human milk triacylgycerols (TAG) were analyzed by tandem mass spectrometry. The SIMPLEX method and a simple linear model were used to interpret the distribution of fatty acids between thesn-2 andsn-1,3 positions in 24 major molecular weight groups of TAG. The number of regio-isomeric pairs of TAG varied between 3 and 18 in each of these groups. Hexadecanoic (16∶0), tetradecanoic (14∶0) and dodecanoic acids (12∶0) typically occupied thesn-2 position in TAG containing less than 54 acyl carbons, whereas long-chain C18 and C20 acids were predominantly located at the primary positions. The positions of the three fatty acids within a TAG molecule were shown to depend on the fatty acid combination. The maximum of 12∶0 in thesn-2 position appeared at acyl carbon number (ACN) 48, the maxima of 14∶0 were at ACN 44 and ACN 50, and for 16∶0 at ACN 46 and 52. |
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Keywords: | Human milk regio-isomers tandem mass spectrometry triacylglycerols |
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