American Journal of Essential Oil and Natural Products


Volume 4, Issue 1

Chemical composition and stability of the hydrosol obtained during the production of essential oils. III. The case of Myrica gale L., Comptonia peregrina (L.) Coulter and Ledum groenlandicum Retzius.

Author(s): Guy Collin, Hélène Gagnon

Abstract: The chemical composition of the oils and hydrosols of Myrica gale, Comptonia peregrina, and Ledum groenlandicum collected from wild plantations in the Grondines region of the province of Quebec, Canada, were determined by GC/FID and GC/MS analyses. The composition of the oil of M. gale shows great variations from one country to another, both qualitatively and quantitatively. Same variations seem to occur also in the C. peregrina oil. The components obtained from the hydrosols were mainly monoterpene alcohols, aldehydes and ketones and as such the compositions of the hydrosols are very different of the corresponding oils: the oil with the most important percentage of hydrocarbon compounds, the compositions of the two phases are different. It appears that in some cases the composition of hydrosols at room temperature may change over a two year period of storage. The L. groenlandicum hydrosol is relatively stable except that the main compound, p-mentha-1(7),8-dien-1-ol undergoes a trans- to cis- isomerization process meanwhile both cis- and trans-p-mentha-2,8-dien-1-ol disappear during the shelf-life study. Possible hydration processes may occur in the hydrosol during the shelf-life.

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