Stable carbon isotope Composition of c9,t11-conjugated linoleic acid in cow's milk as related to dietary fatty acids

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Serval ID
serval:BIB_C3B7B0E8CD31
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Stable carbon isotope Composition of c9,t11-conjugated linoleic acid in cow's milk as related to dietary fatty acids
Journal
Lipids
Author(s)
Richter E.K., Spangenberg J.E., Klevenhusen F., Soliva C.R., Kreuzer M., Leiber F.
ISSN-L
0024-4201
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
47
Pages
161-169
Language
english
Abstract
This study explores the potential use of stable carbon isotope ratios
(delta C-13) of single fatty acids (FA) as tracers for the
transformation of FA from diet to milk, with focus on the metabolic
origin of c9,t11-18:2. For this purpose, dairy cows were fed diets based
exclusively on C-3 and C-4 plants. The FA in milk and feed were
fractionated by silver-ion thin-layer chromatography and analyzed for
their delta C-13 values. Mean delta C-13 values of FA from C-3 milk were
lower compared to those from C-4 milk (-30.1aEuro degrees vs. -24.9aEuro
degrees, respectively). In both groups the most negative delta C-13
values of all FA analyzed were measured for c9,t11-18:2 (C-3 milk =
-37.0 +/- A 2.7aEuro degrees; C-4 milk -31.4 +/- A 1.4aEuro degrees).
Compared to the dietary precursors 18:2n-6 and 18:3n-3, no significant
C-13-depletion was measured in t11-18:1. This suggests that the delta
C-13-change in c9,t11-18:2 did not originate from the microbial
biohydrogenation in the rumen, but most probably from endogenous
desaturation of t11-18:1. It appears that the natural delta C-13
differences in some dietary FA are at least partly preserved in milk FA.
Therefore, carbon isotope analyses of individual FA could be useful for
studying metabolic transformation processes in ruminants.
Open Access
Yes
Create date
26/09/2012 15:11
Last modification date
01/10/2019 7:19
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