Identification of thetrans isomers of octadecenoic acid in human milk

Abstract
The presence oftrans octadecenoic acid isomers was detected and analyzed in 24 hr pooled samples of human milk. Amounts of thetrans isomers of the C18 monoenes ranged from 2% to 4% of the total fatty acids. For purposes of comparison, three commonly used brands of infant formula were also analyzed and found to contain 0.1% to 1.3% oftrans monoene isomers. Data indicate that breast-fed and bottle-fed infants are receiving minimal levels oftrans fatty acids via milk.