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Activité fongitoxique de 12 huiles essentielles vis-à-vis de quatre pathogènes affectant des agrumes : analyse chimique de l'huile Thymus capitatus et effets de cette huile dans des conditions de pression inférieure à la pression atmosphérique.

Fungitoxic activity of 12 essential oils against four postharvest citrus pathogens: chemical analysis of Thymus capitatus oil and its effect in subatmospheric pressure conditions.

Auteurs : ARRAS G., USAI M.

Type d'article : Article

Résumé

The fungitoxic activity against Penicillium digitatum, Penicillium italicum, Botrytis cinerea and Alternaria citri of 12 essential oils (EOs) distilled from medicinal plants is reported. The results of the in vitro trials show that Thymus capitatus (L.) Hofmgg EOs, strongly inhibited the growth of the four fungi at a concentration of 250 ppm (vol/vol). The other 11 essences reduced the development of the fungi from 95 to 9% at 250 ppm (vol/vol). Scanning electron microscope observations showed that T. capitatus EO vapors altered the morphology of P. digitatum hyphae and conidia. The gas chromatographic analyses of thyme EO indicated that carvacrol was present at 81 to 83%, p-cymene at 4.5 to 5%, lambda-terpinene at 2.6 to 3.3%, caryophyllene at 1.5 to 1.6%, beta-myrcene at 1.6%, and linalool at 1.1 to 1.2%. Carvacrol proved to be the most important fungitoxic compound among the thyme EO constituents, but, caused alterations to the fruit at the concentration of 75 ppm.

Détails

  • Titre original : Fungitoxic activity of 12 essential oils against four postharvest citrus pathogens: chemical analysis of Thymus capitatus oil and its effect in subatmospheric pressure conditions.
  • Identifiant de la fiche : 2002-1377
  • Langues : Anglais
  • Source : Journal of Food Protection - vol. 64 - n. 7
  • Date d'édition : 07/2001
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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