# 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

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

Note 1 : The elution order can be determined by calculating the equivalent carbon numbers, often defined by the relation ECN = CN − 2n , where CN is the carbon number and n is the number of double bonds; it can be calculated more precisely by taking into account the origin of the double bond. If n o , n l and n ln are the numbers of double bonds attributed to oleic, linoleic and linolenic acids respectively, the equivalent carbon number can be calculated by means of the relation of the formula:
EN = CN − d o n o − d l n l − d ln n ln
where the coefficient d o , d l and d ln can be calculated by means of the reference triglycerides. Under the conditions specified in this method, the relation obtained will be close to:
ECN = CN − 2,60 n o − 2,35 n l − 2,17 n ln

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/XVIII/annotation/1 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-XVIII/annotation/1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.