FLAVOUR AND FRAGRANCE JOURNAL, vol.18, no.2, pp.87-90, 2003 (SCI-Expanded)
The essential oils from buds of Betula browicziana A. Guner, B. litwinowii Doluch., B. medwediewii Regel, B. pendula Roth and B. recurvata V. Vassil. (Betulaceae) were either hydrodistilled using a Clevengertype apparatus or were subjected to Likens-Nickerson simultaneous distillation-extraction (SDE) when the plant material amounts were insufficient. The resulting bud essentiat oils were analysed by GC-MS. Main components were detected as 14-hydroxy-beta-caryophyllene (1) and 14-hydroxy-4,5-dihydro-beta-caryophyllene (2) in all the oil samples. Copyright (C) 2003 John Wiley Sons, Ltd.