# Commission Regulation (EEC) No 2568/91 of 11 July 1991 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis, Division 2.3: Reference standard

Extent: E+W+S+N.I.

Mixture of methyl esters of pure fatty acids, or the methyl esters of a fat of known composition, preferably similar to that of the fatty matter to be analysed. Cis and trans isomers of octadecenoic, octadecadienoic and octadecatrienoic methyl esters are useful for the identification of trans isomers of unsaturated acids.
Care should be taken to prevent the oxidation of polyunsaturated fatty acids.

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/X/part/B/division/2/division/2.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-X/part-B/division-2/division-2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.