Characterization of cis-9 trans-11 trans-15 C18:3 in milk fat by GC and covalent adduct chemical ionization tandem MS.
Rumen biohydrogenation of dietary alpha-linolenic acid gives rise in ruminants to accumulation of fatty acid intermediates, some of which may be transferred into milk. Rumelenic acid [cis-9 trans-11 cis-15 C18:3 (RLnA)] has recently been characterized, but other C18:3 minor isomers are still unknown. The objective of this work was to identify a new isomer of octatridecenoic acid present in milk fat from ewes fed different sources of alpha-linolenic acid. Structural characterization of this fatty acid was achieved by GC-MS. Analysis of dimethyloxazoline and picolinyl ester derivatives allowed for location of the double bond positions. Covalent adduct chemical ionization tandem mass spectrometry confirmed the positional structure 9-11-15, identical to RLnA, and helped to establish double bond geometry (cis-trans-trans). This new C18:3 isomer could be formed by isomerization of cis-15 bond of RLnA and subsequently converted by hydrogenation to trans-11 trans-15 C18:2, an octadecadienoic acid also detected in this study.
Gómez-Cortés
Pilar
P
Instituto del Frío (Consejo Superior de Investigaciones Científicas), José Antonio Novais 10, 28040 Madrid, Spain.
Tyburczy
Cynthia
C
Brenna
J Thomas
JT
Juárez
Manuela
M
de la Fuente
Miguel Angel
MA
D000818:Animals; D002849:Chromatography, Gas; D004032:Diet; D019587:Dietary Supplements; D005227:Fatty Acids / Q000032:analysis* / Q000737:chemistry*; D008892:Milk / Q000737:chemistry*; D012756:Sheep; D013237:Stereoisomerism; D053719:Tandem Mass Spectrometry; D017962:alpha-Linolenic Acid / Q000008:administration & dosage
D005227:Fatty Acids; D017962:alpha-Linolenic Acid