Reference number
ISO 3794:1976
ISO 3794:1976
© ISO 2024
International Standard
ISO 3794:1976
Essential oils (containing tertiary alcohols) — Estimation of free alcohols content by determination of ester value after acetylation
Edition 1
1976-12
1976-12
ISO 3794:1976
9326
Published
(Edition 1, 1976)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
Abstract
The estimation is carried out by acetylation of the essential oil by acetyl chloride and acetic anhydride, in the presence of dimethylaniline. The acetylated oil is isolated and dried and the ester value is determined. The free alcohols content is calculated taking into account the ester values of the same but non-acetylated essential oil. This method is applicable to essential oils containing an appreciable proportion of tertiary alcohols, namely of linalol and terpineol. It is not applicable to essential oils containing appreciable proportions of phenols, anthranilates, lactones and aldehydes.