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Journal of Lipid Research, Vol. 11, 60-65, January 1970
Copyright © 1970 by Lipid Research, Inc.

Size and lipid composition of chylomicrons of different Svedberg units of flotation

R. Fraser

Department of Experimental Pathology, John Curtin School of Medical Research, Australian National University, Canberra, Australia

Chylomicrons from thoracic duct lymph of rabbits which were fed corn oil were separated in a preparative ultracentrifuge into subfractions of different Sf values in order to compare their size, as determined by electron microscopy, with that expected from ultracentrifugation data. The lipid composition of the chylomicrons of different Sf values was also correlated with their morphology in order to elucidate more about their structure.

Although the diameter distribution of chylomicrons from subfractions of lower Sf ranges corresponded approximately to the expected size distribution, that of the higher Sf ranges contained many small particles. The TG:PL ratio showed a highly significant correlation with the V:SA ratio of chylomicrons from all subfractions. The findings were consistent with the hypothesis that, irrespective of the Sf range of chylomicrons, the core is comprised of TG, while PL is spread as a monomolecular layer on the surface of the particles.

Supplementary key words triglyceride • phospholipid • electron microscopy • ultracentrifugation • volume • surface area • monomolecular layer

Submitted on August 4, 1969
Accepted on October 15, 1969


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