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Chylomicron and VLDL TAG structures and postprandial lipid response induced by lard and modified lard
Author(s) -
YliJokipii Kaisa M.,
Schwab Ursula S.,
Tahvonen Raija L.,
Kurvinen JuhaPekka,
Mykkänen Hannu M.,
Kallio Heikki P. T.
Publication year - 2003
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/s11745-003-1117-6
Subject(s) - chylomicron , postprandial , very low density lipoprotein , chemistry , structural isomer , palmitic acid , oleic acid , food science , lipoprotein , chromatography , biochemistry , lipidology , medicine , clinical chemistry , fatty acid , cholesterol , stereochemistry , insulin
Alterations in chylomicron and VLDL TAG and the magnitude of postprandial lipemia were studied in healthy volunteers after two meals of equal FA composition but different TAG‐FA positional distribution. Molecular level information of individual lipoprotein TAG regioisomers was obtained with a tandem MS method. The incremental area under the response curve of VLDL TAG was large ( P =0.021) after modified lard than after lard. In plasma TAG, the difference did not quite reach statistical significance ( P =0.086). In general, there were less TAG with palmitic acid in the sn ‐2 position and more TAG with oleic acid in the sn ‐2 position in chylomicrons than in fat ingested. From 1.5 to 8 h postprandially, the proportion of individual chylomicron TAG was constant or influenced by TAG M.W. VLDL TAG regioisomerism was similar regardless of the positional distribution of fat ingested. Significant alterations were seen in VLDL TAG FA, in M.W. fractions, and in individual regioisomers with respect to time. The TAG sn ‐14∶0‐18∶1‐18∶1+ sn ‐18∶1‐18∶1‐14∶0, sn ‐16∶0‐16∶1‐18∶1+ sn ‐18∶1‐16∶1‐16∶0, and sn ‐16∶1‐18∶1‐18∶1+ sn ‐18∶1‐18∶1‐16∶1 decreased ( P <0.05); and sn ‐16∶0‐16∶0‐18∶2+ sn ‐18∶2‐16∶0‐16∶0, sn ‐16∶0‐16∶0‐18∶1+ sn ‐18∶1‐16∶0‐16∶0, sn ‐16∶0‐18∶1‐16∶0, and sn ‐16∶0‐18∶1‐18∶2+ sn ‐18∶2‐18∶1‐16∶0 increased ( P <0.05) after both meals. In conclusion, positional distribution of TAG FA was found to affect postprandial lipid metabolism in healthy normolipidemic subjects.