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Statements

Subject Item
n2:RIV%2F67985858%3A_____%2F13%3A00394562%21RIV14-TA0-67985858
rdf:type
skos:Concept n5:Vysledek
dcterms:description
The objective of this work was to optimize the pressure of supercritical CO2 extraction (40 °C, 9-30 MPa) of eucalyptus leaves to reach maximal insecticidal activity of extract. Several methods of extract fractionation were applied to increase the concentration of volatiles in extract. Firstly, a time fractionation with gradually increased solvent density was carried out using one separator. In addition, the SFE combined with extract fractionation in two separators and fractionation with use of appropriate sorbent was applied. The efficiency of SFE in terms of volatile fraction composition, yield and insecticidal activity was compared with hydrodistillation. The composition of volatiles in the isolates was determined by GC-MS and GC-FID. The insecticidal activity of isolates was measured on larvae of Spodoptera litoralis in terms of antifeedancy (ED50), acute and chronic toxicity (LD50). Yield, composition and insecticidal activity of extracts were strongly influenced by the experimental conditions. The efficiency of CO2 extracts was comparable with that of hydrodistillate. However, the chronical toxicity (LD50 = 8 µg) of the extract obtained at 40°C and 30 MPa was almost two times higher than that of the hydrodistillate. The objective of this work was to optimize the pressure of supercritical CO2 extraction (40 °C, 9-30 MPa) of eucalyptus leaves to reach maximal insecticidal activity of extract. Several methods of extract fractionation were applied to increase the concentration of volatiles in extract. Firstly, a time fractionation with gradually increased solvent density was carried out using one separator. In addition, the SFE combined with extract fractionation in two separators and fractionation with use of appropriate sorbent was applied. The efficiency of SFE in terms of volatile fraction composition, yield and insecticidal activity was compared with hydrodistillation. The composition of volatiles in the isolates was determined by GC-MS and GC-FID. The insecticidal activity of isolates was measured on larvae of Spodoptera litoralis in terms of antifeedancy (ED50), acute and chronic toxicity (LD50). Yield, composition and insecticidal activity of extracts were strongly influenced by the experimental conditions. The efficiency of CO2 extracts was comparable with that of hydrodistillate. However, the chronical toxicity (LD50 = 8 µg) of the extract obtained at 40°C and 30 MPa was almost two times higher than that of the hydrodistillate.
dcterms:title
Supercritical Fluid Fractionation for Enhancement of Insecticidal Activity of Eucalyptus Extract Supercritical Fluid Fractionation for Enhancement of Insecticidal Activity of Eucalyptus Extract
skos:prefLabel
Supercritical Fluid Fractionation for Enhancement of Insecticidal Activity of Eucalyptus Extract Supercritical Fluid Fractionation for Enhancement of Insecticidal Activity of Eucalyptus Extract
skos:notation
RIV/67985858:_____/13:00394562!RIV14-TA0-67985858
n5:predkladatel
n6:ico%3A67985858
n3:aktivita
n13:P n13:I
n3:aktivity
I, P(TA01010578)
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n9:3329194 n9:4168364 n9:2880598
n3:druhVysledku
n10:D
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
109001
n3:idVysledku
RIV/67985858:_____/13:00394562
n3:jazykVysledku
n7:eng
n3:klicovaSlova
supercritical CO2 extraction; extract fractionation; eucalyptus
n3:klicoveSlovo
n11:supercritical%20CO2%20extraction n11:eucalyptus n11:extract%20fractionation
n3:kontrolniKodProRIV
[F662274A2027]
n3:mistoKonaniAkce
Napoli
n3:mistoVydani
Salerno
n3:nazevZdroje
Proceedings
n3:obor
n14:CI
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n12:TA01010578
n3:rokUplatneniVysledku
n4:2013
n3:tvurceVysledku
Maixnerová, Lucie Pavela, R. Sajfrtová, Marie Topiař, Martin
n3:typAkce
n21:EUR
n3:zahajeniAkce
2013-05-29+02:00
s:numberOfPages
8
n20:hasPublisher
Centro Stampa di Ateneo
n18:isbn
88-7897-061-1