Effects of planting time and mineral fertilization on peppermint (mentha x piperita l.) essential oil composition and its biological activity

Abstract

Essential oil samples of Menfha x piperita L. (peppermint) were analysed by GC-MS and assayed for their antibacterial, antifungal and antioxidant activities. The steam-distilled oil samples were obtained from autumn and spring planted crops which were treated with nitrogen and phosphorus fertilizers at different rates. The oil samples from spring planted crops had a significantly higher menthol and lower terpinen-4-01 concentrations than those from autumn planted crops. Mineral fertilization seemed to increase the content of menthol in the oil, and decreased that of menthone and 8-caryophyllene. The oil samples showed a different degree of inhibition against the twenty-five microorganisms tested. Some differences were found between the oil samples from autumn and spring planted crops, the former being more active against some microorganisms, and the oil samples from fertilized peppermint seemed to be, on the whole, slightly more effective. Peppermint oil exhibited a marked antifungal activity against Aspergillus niger.

In vitro antifungal effects of the essential oil of Mentha piperita L. and its comparison with synthetic menthol on Aspergillus niger

“…The oil samples showed a different degree of inhibition against the twenty-five microorganisms tested. Peppermint oil exhibited a marked antifungal activity against Aspergillus niger (Marotti et al, 1994). In vitro antimicrobial activity of essential oils and the mechanisms of essential oils action on microorganisms are reported.…”

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“…In addition, phenylpropanoids such as eugenol and trans-cinnamaldehyde, commonly found in cinnamon essential oil are able to inactivate microbial enzymes by forming linkages via hydrogen, ionic and hydrophobic interactions, eventually leading to bacterial cell death [65][66]. Other monoterpenes such as carvone, limonene and 1, 8-cineole found commonly in eucalyptus and rosemary essential oil are known to affect the metabolism and growth rate of bacteria [67][68]. …”

Antibakterielle In-vitro-Wirksamkeit ätherischer Öle gegen veterinärmedizinisch relevante Keime klinischer Isolate von Hunden, Katzen und Pferden

“…Die Zusammensetzung der ätherischen Öle kann je nach Wuchsort der Ursprungspflanze, klimatischen Bedingungen und Erntephase differieren [39,[45][46][47][48]. Diese unterschiedliche Zusammensetzung eines ätherischen Öls kann eine veränderte antibakterielle Wirksamkeit zur Folge haben [39,[46][47][48].…”

“…Diese unterschiedliche Zusammensetzung eines ätherischen Öls kann eine veränderte antibakterielle Wirksamkeit zur Folge haben [39,[46][47][48]. Somit gelten die Ergebnisse eines Aromatogramms genau genommen nur für den spezifisch von einem Patienten isolierten Keim und das getestete ätherische Öl einer Charge, das die gleiche Zusammensetzung hat [29].…”