Variation of the Chemical Composition of Essential Oil ofMentha piperitaL. during the Growing Time

Abstract
This study was conducted over a period of three years. A marked inversion of the menthol/menthone ratio was observed according to harvesting time. The late blooming period gave oils rich in menthol. A second harvest gave a high-quality oil and increased overall yield. Pre-drying did not affect the chemical composition of the oil obtained but allowed larger amounts of plant material to be distilled.

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