# 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 7: EXPRESSION OF THE RESULTS

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

Report individual aliphatic and triterpenic alcohols concentrations as mg/kg of fatty material and their sum as 'total aliphatic alcohol content'. The total content is the sum of C22, C24, C26 and C28.
The composition of each of the individual alcoholic compounds should be expressed to one decimal point.
Total sterol concentration should be expressed without any decimal point.
Calculate the percentage of each individual sterol from the ratio of the relevant peak area to the total peak area for sterols:
Sterol x = A x Σ A × 100
where:
A x Peak area for sterol x.
Σ A Total peak area for sterols.
Apparent β-sitosterol: Δ5,23-stigmastadienol + clerosterol + β-sitosterol + sitostanol + Δ5-avenasterol + Δ5,24-stigmastadienol.
Calculate the percentage of erythrodiol and uvaol:
Erythrodiol + Uvaol = A Er + A Uv Σ A T × 100
where:
A Er Area of Erythrodiol in computing system counts.
A Uv Area of Uvaol in computing system counts.
Σ AT Sum area for sterol + erythrodiol + uvaol in computing system counts.
Besides the calculation of relative percentage of single sterols and triterpenic dialcohols and the total concentration of sterols, the concentration of erythrodiol and of uvaol and their sum, in mg/kg of fatty material must be calculated, according the following expressions:
Erythrodiol = A Er × m s A s × m × 1000
Uvaol = A Uv × m s A s × m × 1000
where:
A Er Peak area of Erythrodiol, in computing system counts.
A Uv Area of Uvaol in computing system counts.
A s Area of the α-cholestanol peak, in computing system counts.
m s Mass of added α-cholestanol, in milligrams.
m Mass of the sample used for determination, in grams.

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/XIX/part/3/division/7 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-XIX/part-3/division-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.