1998 Volume 47 Issue 3 Pages 277-282,293
Trans fatty acid content in fat from domestic cow and goat milk was determined by conducting capillary GLC and silver-ion TLC in conjunction on fatty acid propyl esters.
1) In sixty-eight commercial cow milk samples purchased from August to October 1994, mean t-C18 : 1 acid was 3.2% (range : 2.1% to 4.9%) of total fatty acids, this being in good agreement with data reported for French butter. Total trans fatty acid content (including t-C16 : 1, C18 : 2 and C18 : 3) varied from 2.7 and 7.5% (mean 4.5%).
No species (Holstein, Jersey or Guernsey) or regional differences in trans fatty acid content could be detected.
2) In five commercial goat milk samples purchased from April to May 1995, mean total trans fatty acid was 5.6% (range : 4.4% to 6.3%) of total fatty acids.
3) As for seasonal variation in cow milk from dairy farm from November 1994 to October 1995, total trans fatty acid content was highest (4.8%) in milk during December to February and lowest (3.3%) during June to August. These values were signiticantly lower than those in European countries, indicating the differences in feed stuffs.