Occurrence of trans-unsaturated acids in the faecal lipids of ruminants and non-ruminants.
نویسندگان
چکیده
After the identification of 5-10% of trans-unsaturated acids, mainly elaidic (trans-octadec-9-enoic) and vaccenic (trans-octadec-11-enoic), in ox fat (Swern, Knight & Eddy, 1952), it has been shown in this Laboratory (Hartman, Shorland & McDonald, 1954, 1955) that substantial amounts of these acids appear in the depot fats of other ruminants (3-5-11-2 %) and in certain marsupials (18-1-21-0 %), but less than 1% in non-ruminants. Their presence has been attributed (Hartman et al. 1954) to the activity of rumen micro-organisms which, as first demonstrated by Reiser (1951), are efficient hydrogenators. Since hydrogenation is known to be accompanied by partial formation of trans isomers (Hilditch & Vidyarthi, 1929) bacterial action could account for the presence of trans acids in the fats of ruminants and certain marsupials, the stomachs of which contain a microbial population (Moir, Somers, Sharman & Waring, 1954). In the large intestines of both ruminants and non-ruminants there is a rich bacterial flora and a strongly reducing atmosphere, which in the light of the above-mentioned suggestion of Hartman et al. (1954) should be conducive to trans isomerization of unsaturated fatty acids. To obtain information on this point faecal lipids from a number of ruminants and non-ruminants were examined for their contents of trans acids. The present paper reports the results of this investigation.
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ورودعنوان ژورنال:
- The Biochemical journal
دوره 69 1 شماره
صفحات -
تاریخ انتشار 1958