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The oil and extract composition of two Bulgarian cultivars of Mentha piperita L., obtained by hydrodistillation and dichloromethane extraction, respectively, were analyzed by GC/MS. The oil yield from ‘Zefir’ was 0.97% and that from ‘Kliment-63’ was 0.54%. The oil from ‘Zefir’ was found to be rich in menthol (46.2–50.2%) and menthyl acetate (16.8–22.5%). In the oil from ‘Kliment-63,’ the content of these components was lower, while the menthone content was higher (20.0–23.1%).
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Stojanova et al. (2000) studied this question.
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