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The effects of extracts obtained by supercritical fluid extraction and traditional extraction techniques on larvae leptinotarsa decemlineata SAY. / Roman Pavela in The journal of essential oil research, Vol. 21 N° 4 (Juillet/Août 2009) 

Public ISBD [article]  in The journal of essential oil research > Vol. 21 N° 4 (Juillet/Août 2009) . - pp. 367-373 Titre : The effects of extracts obtained by supercritical fluid extraction and traditional extraction techniques on larvae leptinotarsa decemlineata SAY. Type de document : texte imprimé Auteurs : Roman Pavela, Auteur ; Marie Sajfrtová, Auteur ; Helena Sovová, Auteur Article en page(s) : pp. 367-373 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Satureja  hortensis  Thymus  vulgaris  Lamiaceae  Essential  oil  composition  Extract  composition  Supercritical  CO2  Extract  composition  γ-terpinene  Carvacrol  Thymol  Leptinotarsa  decemlineata  Insecticidad  activity  Lethal  doses  Botanical  insecticides Index. décimale : 646 Résumé : Extracts from savory (Satureja hortensis L.) and thymus (Thymus vulgaris L.) were obtained by supercritical fluid extraction, hydrodistillation, and Soxhlet extraction with benzene and ethanol. The composition of volatile compounds in the extracts was determined by gas chromatography, and the toxicity and antifeedant effects of the extracts on larvae of Colorado potato beetle were evaluated. Generally it is possible to claim that all extracts caused mortality in 24 h after their topical application. Significant differences between the particular extracts and plants were found. The most effective isolates were the essentials oils which showed the lowest LD50. The lethal dosages of 22 mg and 29 mg were determined for oil from S. hortensis and T. vulgaris, respectively, but the difference was not significant (P < 0.05). The extracts of S. hortensis (SFE2 and SFE3) had similar efficiencies as the oils with lethal dosages of LD50 28 mg and 30 mg, respectively. Strong deterrent effects of all extracts against larvae were observed. In the no-choice test with leaf discs, the consumption of control food by the fourth instars larvae L. decemlineata was significantly higher than the consumption of treated food in the treatment concentrations (P < 0.05). The AFI declined depending on the concentration. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top [article] The effects of extracts obtained by supercritical fluid extraction and traditional extraction techniques on larvae leptinotarsa decemlineata SAY. [texte imprimé] / Roman Pavela, Auteur ; Marie Sajfrtová, Auteur ; Helena Sovová, Auteur . - pp. 367-373. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 21 N° 4 (Juillet/Août 2009) . - pp. 367-373 Mots-clés : Satureja  hortensis  Thymus  vulgaris  Lamiaceae  Essential  oil  composition  Extract  composition  Supercritical  CO2  Extract  composition  γ-terpinene  Carvacrol  Thymol  Leptinotarsa  decemlineata  Insecticidad  activity  Lethal  doses  Botanical  insecticides Index. décimale : 646 Résumé : Extracts from savory (Satureja hortensis L.) and thymus (Thymus vulgaris L.) were obtained by supercritical fluid extraction, hydrodistillation, and Soxhlet extraction with benzene and ethanol. The composition of volatile compounds in the extracts was determined by gas chromatography, and the toxicity and antifeedant effects of the extracts on larvae of Colorado potato beetle were evaluated. Generally it is possible to claim that all extracts caused mortality in 24 h after their topical application. Significant differences between the particular extracts and plants were found. The most effective isolates were the essentials oils which showed the lowest LD50. The lethal dosages of 22 mg and 29 mg were determined for oil from S. hortensis and T. vulgaris, respectively, but the difference was not significant (P < 0.05). The extracts of S. hortensis (SFE2 and SFE3) had similar efficiencies as the oils with lethal dosages of LD50 28 mg and 30 mg, respectively. Strong deterrent effects of all extracts against larvae were observed. In the no-choice test with leaf discs, the consumption of control food by the fourth instars larvae L. decemlineata was significantly higher than the consumption of treated food in the treatment concentrations (P < 0.05). The AFI declined depending on the concentration. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top