# 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: FIELD OF APPLICATION

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

The preparation of the fatty acid methyl esters from olive oils and olive-pomace oils are performed by transesterification with methanolic solution of potassium hydroxide at room temperature. The necessity of purification of the sample prior to the trans-esterification depends on the sample's free fatty acids content and the analytical parameter to be determined, it can be chosen according to the following table:
Category of oil
Method
Virgin olive oil with acidity ≤ 2,0 %
1.. Fatty acids
2.. trans -Fatty acids
3.. ΔECN42 (after purification with silica-gel SPE)
Refined olive oil
Olive oil composed of refined olive oil and virgin olive oils
Refined olive pomace oil
Olive pomace oil
Virgin olive oil with acidity > 2,0 %
Crude olive pomace oil
1.. Fatty acids (after purification with silica-gel SPE)
2.. trans -Fatty acids (after purification with silica-gel SPE)
3.. ΔECN42 (after purification with silica-gel SPE)

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