ISO/WD
14
© ISO 2013 – All rights reserved
Annex A
(normative)
Groups or class of fatty acids and individual fatty acids
A.1 Group or class of fatty acids
A.1.1 Trans fatty acids (TFA)
TFA is the sum of fatty acids containing one or more non conjugated double bonds in
trans
configuration (only
C18:1, C18:2 and C18:3 trans are included in the sum).
NOTE
Presence of other trans isomers naturally present in milk fat have been reported in literature (e.g.
C16:1) but their contributions have not significant influence on the total amount of trans in milk products. In
addition, their identification are complex especially because these isomers are frequently interfered with other
isomers (e.g. cis , iso and anteiso) and need preliminary separation technique.
A.1.2 Conjugated linoleic acids (CLA)
Conjugated linoleic acids are the sum of octadecadienoic acids containing conjugated double bonds in
cis
or
trans
configuration; mainly
cis
-9,
trans
-11 octadecadienoic acid (i.e. rumenic acid).
A.1.3 Saturated fatty acids (SFA)
Saturated fatty acids are the sum of all fatty acids which contain no double bonds.
A.1.4 Monounsaturated fatty acids (MUFA)
Monounsaturated fatty acids are the sum of all fatty acids containing one double bonds in cis configuration.
A.1.5 Polyunsaturated fatty acids (PUFA)
Polyunsaturated fatty acids are the sum of all fatty acids containing two or more double bonds in cis configuration.
NOTE
LC-PUFA is the generic name to describe the long chain polyunsaturated fatty acids but these fatty
acids are also included into PUFA (i.e. Arachidonic, Ecosapentaenoic and docosahexaenoic acids).
A.1.6 Omega-3 fatty acid (ω – 3)
Omega-3 fatty acid is the sum of cis polyunsaturated fatty acids having the first double bonds at carbon (n-3) from
the terminal methyl group.
A.1.7 Omega-6 fatty acid (ω - 6)
Omega-6 fatty acid
is the sum of cis polyunsaturated fatty acids having the first double bonds at carbon (n-6) from
the terminal methyl group.
A.1.8 Omega-9 fatty acid (ω – 9)
Omega-3 fatty acid is the sum of cis polyunsaturated fatty acids having the first double bonds at carbon (n-9) from
the terminal methyl group.
