Main compounds responsible for off-odour of strawberries infected byPhytophthora cactorum.

Autor: Jeleń, H. H., Krawczyk, J., Larsen, T. O., Jarosz, A., Goł&ecedil;bniak, B.
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Zdroj: Letters in Applied Microbiology; Apr2005, Vol. 40 Issue 4, p255-259, 5p
Abstrakt: h.h. jeleń, j. krawczyk, t.o. larsen, a. jarosz and b. gołębniak. 2005.Volatile compounds present in strawberries infected withPhytophthora cactorum, especially those responsible for the characteristic off-odour of such fruits were the subject of this study.Six strawberry varieties (Redgauntlet, Selva, Korona, Tenira, Real, Pegasus) inoculated withP. cactorumstrain (PC-5), isolated from naturally infected fruit and one variety inoculated with 15 strains ofP. cactorumin the laboratory were analysed. All the samples had a distinct, to a various degree, off-odour reminiscent of watercolour paint with phenolic notes. Volatile compounds were isolated by solid phase microextraction and simultaneous distillation extraction methods. To detect compounds responsible for the characteristic off-odour, gas chromatography–olfactometry was used. Two compounds were found to be responsible for the characteristic off-odour of strawberries infected byP. cactorum: 4-ethyl phenol and 4-ethyl-2-metoxy phenol (4-ethyl guaiacol). The content of these compounds in infected varieties ranged from 1·12 to 22·56 mg kg−1 and 0·14–1·05 mg kg−1 respectively. Other volatile compounds, not detected in noninoculated sound strawberries, were also identified: camphene, 1-octene-3-ol, 3-octanone, o-cymene, phenyl methanol,cis-linaloloxide, nonanal, phenyl ethyl alcohol, 2-undecanone andα-muurolene.Volatile compounds responsible for the characteristic off-odour of strawberries infected withP. cactorumwere identified. Also compounds produced as a result ofP. cactorumgrowth on strawberry fruit were characterized. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index