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Seasonal variation in yield and composition of Thymus zygis L. subsp. sylvestris essential oil

✍ Scribed by M. Moldão-Martins; M. G. Bernardo-Gil; M. L. Beirão Da Costa; M. Rouzet

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
134 KB
Volume
14
Category
Article
ISSN
0882-5734

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✦ Synopsis

The seasonal variation in the yield and composition of the essential oil from collective samples of Thymus zygis L. collected in North Portugal is reported. Essential oil was obtained by steam distillation and by distillation in a modi®ed Clevenger apparatus. Analysis was performed by GC and GC±MS. The yield in essential oil showed a maximum at the ¯owering stage (0.9±1.4%) and a minimum during the dormancy period (about 0.15%). The composition also showed dierent patterns at dierent phases of the vegetative cycle. At the ¯owering period the essential oil is rich in thymol and geraniol. p-Cymene showed a variation presenting a maximum at the minimum of thymol ( post-¯owering period). Aiming the use of the essential oil as a food ingredient, the most interesting stage is the post-¯owering period, the essential oil at this time being rich in thymol (about 21%), geranyl acetate (about 17%) and geraniol (about 13%), with p-cymene presenting lower levels.

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