OMB Meeting Book_9-11-14

ISO/WD

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.

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