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Progress in Essential Oils
By: Brian M. Lawrence
Posted: May 14, 2008, from the June 2008 issue of P&F magazine.
Clary Sage Oil
The oils of the inflorescences of a Sicilian spontaneous biotype of clary sage that was grown in the vicinity of Sparacia (Sicily, Italy) were analyzed using GC-FID and GC/MS by Carrubba et al. (2002). As expected, the inflorescence oils that were obtained by hydrodistillation were found to be rich in linalool and linalyl acetate as shown in T-1. The authors also showed that the leaf oils produced from flowering plants were determined to possess the following range in composition:
alpha-cubebene (< 0.01%)
beta-bourbonene (< 0.01–0.07%)
allo-aromadendrene (0.23–0.76%) g
germacrene D (67.72–68.85%)
viridiflorene (< 0.01–0.10%)
alpha-muurolene (< 0.01–0.10%)
cadina-1,4-diene (< 0.01–0.06%)
alpha-cadinene (< 0.01–0.05%)
alpha-muurolol (< 0.01–0.04%)
An oil of clary sage was compared with a volatile concentrate of the same batch of plant material using co-distillation with superheated pentane vapor (Mastelic and Jerkovic 2003). The results of this comparison are presented in T-2. As can be seen, the hydrolysis and rearrangement of linalyl acetate during water distillation did not occur during the volatile concentrate isolation, thereby making this a useful method for isolating oils that are susceptible to rearrangement during isolation.
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