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Nutrient Metabolism

Stereospecific Incorporation of Palmitoyl, Oleoyl and Linoleoyl Moieties into Adipose Tissue Triacylglycerols of Rats Results in Constant sn-1:sn-2:sn-3 in Rats Fed Rapeseed, Olive, Conventional or High Oleic Sunflower Oils, but Not in Those Fed Coriander Oil

Institute for Lipid Research, Federal Centre for Cereal, Potato and Lipid Research, D-48147 Münster, Germany

¹To whom correspondence should be addressed. E-mail: ibtfett{at}uni-muenster.de.

We report the stereospecific (sn-1, sn-2, sn-3) distribution of fatty acids in subcutaneous adipose tissue triacylglycerols of male weaned Wistar rats fed either a standard diet or diets containing, in addition to 20 g corn oil/kg feed, 120 g/kg feed, each, of canola-type rapeseed oil, olive oil, conventional or high oleic sunflower oil or high petroselinic coriander oil for 10 wk. The regiospecific distribution of the major acyl moieties in the sn-1 (3) vs. sn-2 positions of the adipose tissue triacylglycerols broadly reflected that of the dietary oils. The saturated palmitoyl and stearoyl moieties were more abundant in the sn-1 and sn-3 positions compared with the sn-2 position of the adipose tissue triacylglycerols, and both occurred at a higher proportion in the sn-1 than in the sn-3 position. Oleoyl moieties were abundant in all the three positions of the adipose tissue triacylglycerols, whereas petroselinoyl moieties were more abundant in the sn-1 and sn-3 positions compared with the sn-2 position. Linoleoyl moieties occurred predominantly in the sn-2 position compared with the sn-1 and sn-3 positions of the adipose tissue triacylglycerols; however, they were more abundant in the sn-3 than in the sn-1 position. Despite widely varying proportions of the palmitoyl, oleoyl and linoleoyl moieties at the three positions of the dietary triacylglycerols, the ratios of each of these acyl moieties at the sn-1, sn-2, and sn-3 positions in adipose tissue triacylglycerols were essentially constant for all groups, with the exception of the group fed coriander oil, indicating a rigid stereospecific incorporation.

KEY WORDS: • rapeseed oil • olive oil • sunflower oil • stereospecific acyl pattern of triacylglycerols • rat subcutaneous adipose tissue