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Ralf G. Berger - One of the best experts on this subject based on the ideXlab platform.

  • characteristic volatiles from young and aged fruiting bodies of wild polyporus sulfureus bull fr fr
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Shimin Wu, Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid−liquid extraction (CLLE) and investigated by high-resolution gas chromatography−mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography−olfactometry (GC−O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus:  1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC−O and detected by GC-MS were determined as the characteristic odorants of aged species:  2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with it...

  • Characteristic volatiles from young and aged fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr.
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid-liquid extraction (CLLE) and investigated by high-resolution gas chromatography-mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography-olfactometry (GC-O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus: 1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC-O and detected by GC-MS were determined as the characteristic odorants of aged species: 2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with its host, location, and age.

  • Volatile compounds from the fruiting bodies of beefsteak fungus Fistulina hepatica (Schaeffer: Fr.) Fr.
    Food Chemistry, 2005
    Co-Authors: Ulrich Krings, Holger Zorn, Ralf G. Berger
    Abstract:

    The volatile compounds from the fruiting bodies of wild Fistulina hepatica (Schaeffer: Fr.) Fr. were isolated by continuous liquid liquid extraction (CLLE), and investigated by high resolution gas chromatography–mass spectrometry (HRGC–MS), GC-atomic emission detector (GC-AED), and gas chromatography-olfactometry (GC-O). Forty eight major volatile compounds were identified and semi-quantified. 11 odorous compounds significantly contributed to the overall flavour of F. hepatica: 1-Octen-3-One, 1-octen-3-ol, linalool, phenylacetaldehyde, butanoic acid, an unidentified volatile compound with mouldy odour, (E)-2-methyl-2-butenoic acid, (E)-methyl cinnamate, (Z)-9-hexadecenoic acid methyl ester, bisabolol oxide B and phenylacetic acid.

Holger Zorn - One of the best experts on this subject based on the ideXlab platform.

  • characteristic volatiles from young and aged fruiting bodies of wild polyporus sulfureus bull fr fr
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Shimin Wu, Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid−liquid extraction (CLLE) and investigated by high-resolution gas chromatography−mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography−olfactometry (GC−O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus:  1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC−O and detected by GC-MS were determined as the characteristic odorants of aged species:  2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with it...

  • Characteristic volatiles from young and aged fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr.
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid-liquid extraction (CLLE) and investigated by high-resolution gas chromatography-mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography-olfactometry (GC-O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus: 1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC-O and detected by GC-MS were determined as the characteristic odorants of aged species: 2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with its host, location, and age.

  • Volatile compounds from the fruiting bodies of beefsteak fungus Fistulina hepatica (Schaeffer: Fr.) Fr.
    Food Chemistry, 2005
    Co-Authors: Ulrich Krings, Holger Zorn, Ralf G. Berger
    Abstract:

    The volatile compounds from the fruiting bodies of wild Fistulina hepatica (Schaeffer: Fr.) Fr. were isolated by continuous liquid liquid extraction (CLLE), and investigated by high resolution gas chromatography–mass spectrometry (HRGC–MS), GC-atomic emission detector (GC-AED), and gas chromatography-olfactometry (GC-O). Forty eight major volatile compounds were identified and semi-quantified. 11 odorous compounds significantly contributed to the overall flavour of F. hepatica: 1-Octen-3-One, 1-octen-3-ol, linalool, phenylacetaldehyde, butanoic acid, an unidentified volatile compound with mouldy odour, (E)-2-methyl-2-butenoic acid, (E)-methyl cinnamate, (Z)-9-hexadecenoic acid methyl ester, bisabolol oxide B and phenylacetic acid.

Ulrich Krings - One of the best experts on this subject based on the ideXlab platform.

  • characteristic volatiles from young and aged fruiting bodies of wild polyporus sulfureus bull fr fr
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Shimin Wu, Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid−liquid extraction (CLLE) and investigated by high-resolution gas chromatography−mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography−olfactometry (GC−O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus:  1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC−O and detected by GC-MS were determined as the characteristic odorants of aged species:  2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with it...

  • Characteristic volatiles from young and aged fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr.
    Journal of Agricultural and Food Chemistry, 2005
    Co-Authors: Holger Zorn, Ulrich Krings, Ralf G. Berger
    Abstract:

    The volatile compounds of fresh fruiting bodies of wild Polyporus sulfureus (Bull.:Fr.) Fr. growing on oak trees were isolated by continuous liquid-liquid extraction (CLLE) and investigated by high-resolution gas chromatography-mass spectrometry (HRGC-MS) on two GC columns of different polarity (DB-5 and ZB-WAX), and by gas chromatography-olfactometry (GC-O). A total of 40 major volatile compounds from the young samples were identified and semiquantified. Five odorous compounds were determined to be responsible for the characteristic flavor of young Polyporus sulfureus: 1-Octen-3-One, 1-octen-3-ol, 3-methylbutanoic acid, phenylethanol, and phenylacetic acid. Four volatiles investigated by GC-O and detected by GC-MS were determined as the characteristic odorants of aged species: 2-methylpropanoic acid, butanoic acid, 3-methylbutanoic acid, and phenylacetic acid. The comparative results revealed that the volatile composition of the fruiting bodies even from the same fungal species may greatly vary with its host, location, and age.

  • Volatile compounds from the fruiting bodies of beefsteak fungus Fistulina hepatica (Schaeffer: Fr.) Fr.
    Food Chemistry, 2005
    Co-Authors: Ulrich Krings, Holger Zorn, Ralf G. Berger
    Abstract:

    The volatile compounds from the fruiting bodies of wild Fistulina hepatica (Schaeffer: Fr.) Fr. were isolated by continuous liquid liquid extraction (CLLE), and investigated by high resolution gas chromatography–mass spectrometry (HRGC–MS), GC-atomic emission detector (GC-AED), and gas chromatography-olfactometry (GC-O). Forty eight major volatile compounds were identified and semi-quantified. 11 odorous compounds significantly contributed to the overall flavour of F. hepatica: 1-Octen-3-One, 1-octen-3-ol, linalool, phenylacetaldehyde, butanoic acid, an unidentified volatile compound with mouldy odour, (E)-2-methyl-2-butenoic acid, (E)-methyl cinnamate, (Z)-9-hexadecenoic acid methyl ester, bisabolol oxide B and phenylacetic acid.

T.j. Ridsdill-smith - One of the best experts on this subject based on the ideXlab platform.

  • The Effect of Volatile Metabolites of Lipid Peroxidation on the Aggregation of Redlegged Earth Mites Halotydeus destructor (Acarina: Penthaleidae) on Damaged Cotyledons of Subterranean Clover
    Journal of Chemical Ecology, 1997
    Co-Authors: Y. Jiang, T.j. Ridsdill-smith, Emilio L. Ghisalberti
    Abstract:

    Redlegged earth mites ( Halotydeus destructor ) aggregated in larger numbers on cotyledons of subterranean clover ( Trifolium subterraneum L.) previously damaged either by mite feeding or by mechanical injury than on undamaged cotyledons. This effect lasted for up to 7 days. The total volatile fractions derived from crushed cotyledons and its three major components, 2-( E )-hexenal, 1-octen-3-ol, and 1-Octen-3-One, were tested for their effect on the aggregation of mites. Significantly more mites gathered on detached cotyledons treated with the metabolites at low concentrations than on controls, with 2-( E )-hexenal being the most effective. Mites were repelled by higher concentrations of the metabolites and 1-Octen-3-One, the most active, killed mites at high concentrations. Fewer mites aggregated on DGI007 (resistant) than on Dalkeith (susceptible) cotyledons treated with droplets of the metabolites. The three volatile metabolites were recovered from the headspace of undamaged and of damaged cotyledons. Crushed cotyledons of Dalkeith produced higher levels of 2-( E )-hexenal and lower levels of 1-Octen-3-One than undamaged cotyledons. The results suggest that damage-induced metabolites enhance the aggregation of redlegged earth mites at low concentrations and reduce aggregation at high concentrations.

  • Correlation of 1-Octen-3-One with antixenotic resistance in subterranean clover cotyledons to red-legged earth mite, Halotydeus destructor (Acarina: Penthaleidae)
    Journal of chemical ecology, 1996
    Co-Authors: Y. Jiang, Emilio L. Ghisalberti, T.j. Ridsdill-smith
    Abstract:

    Artificially damaged cotyledons of subterranean clover (Trifolium subterraneum L.) released several volatile metabolites, including 1-Octen-3-One, arising from lipid peroxidation. The amount of 1-Octen-3-One produced was negatively correlated with feeding damage caused by the red-legged earth mite (Halotydeus destructor) in nine out of 10 resistant and susceptibleT. subterraneum varieties tested. The EC50 of this compound in deterring mites from feeding in a membrane bioassay was 50 ppm. Cotyledon toughness was also involved in resistance. The resistant variety, S3615D, which has the lowest toughness value among the resistant varieties, produced the highest amount of 1-Octen-3-One recovered from the headspace in 1 hr. Artificially damaged cotyledons of both susceptible Dalkeith and resistant DG1007, growing in shade, showed lower toughness, but had enhanced production of C8 volatile compounds and were avoided by mites during a 3-hr feeding test. When both 1-Octen-3-One content and cotyledon toughness value were taken as cofactors in resistance, the resultant multiplication value yielded a more significantly negative correlation with mite feeding damage scores within the 10 varieties than either factor alone. We conclude that 1-Octen-3-One has a role in resistance of subclover cotyledon to the mite.

Emilio L. Ghisalberti - One of the best experts on this subject based on the ideXlab platform.

  • The Effect of Volatile Metabolites of Lipid Peroxidation on the Aggregation of Redlegged Earth Mites Halotydeus destructor (Acarina: Penthaleidae) on Damaged Cotyledons of Subterranean Clover
    Journal of Chemical Ecology, 1997
    Co-Authors: Y. Jiang, T.j. Ridsdill-smith, Emilio L. Ghisalberti
    Abstract:

    Redlegged earth mites ( Halotydeus destructor ) aggregated in larger numbers on cotyledons of subterranean clover ( Trifolium subterraneum L.) previously damaged either by mite feeding or by mechanical injury than on undamaged cotyledons. This effect lasted for up to 7 days. The total volatile fractions derived from crushed cotyledons and its three major components, 2-( E )-hexenal, 1-octen-3-ol, and 1-Octen-3-One, were tested for their effect on the aggregation of mites. Significantly more mites gathered on detached cotyledons treated with the metabolites at low concentrations than on controls, with 2-( E )-hexenal being the most effective. Mites were repelled by higher concentrations of the metabolites and 1-Octen-3-One, the most active, killed mites at high concentrations. Fewer mites aggregated on DGI007 (resistant) than on Dalkeith (susceptible) cotyledons treated with droplets of the metabolites. The three volatile metabolites were recovered from the headspace of undamaged and of damaged cotyledons. Crushed cotyledons of Dalkeith produced higher levels of 2-( E )-hexenal and lower levels of 1-Octen-3-One than undamaged cotyledons. The results suggest that damage-induced metabolites enhance the aggregation of redlegged earth mites at low concentrations and reduce aggregation at high concentrations.

  • Correlation of 1-Octen-3-One with antixenotic resistance in subterranean clover cotyledons to red-legged earth mite, Halotydeus destructor (Acarina: Penthaleidae)
    Journal of chemical ecology, 1996
    Co-Authors: Y. Jiang, Emilio L. Ghisalberti, T.j. Ridsdill-smith
    Abstract:

    Artificially damaged cotyledons of subterranean clover (Trifolium subterraneum L.) released several volatile metabolites, including 1-Octen-3-One, arising from lipid peroxidation. The amount of 1-Octen-3-One produced was negatively correlated with feeding damage caused by the red-legged earth mite (Halotydeus destructor) in nine out of 10 resistant and susceptibleT. subterraneum varieties tested. The EC50 of this compound in deterring mites from feeding in a membrane bioassay was 50 ppm. Cotyledon toughness was also involved in resistance. The resistant variety, S3615D, which has the lowest toughness value among the resistant varieties, produced the highest amount of 1-Octen-3-One recovered from the headspace in 1 hr. Artificially damaged cotyledons of both susceptible Dalkeith and resistant DG1007, growing in shade, showed lower toughness, but had enhanced production of C8 volatile compounds and were avoided by mites during a 3-hr feeding test. When both 1-Octen-3-One content and cotyledon toughness value were taken as cofactors in resistance, the resultant multiplication value yielded a more significantly negative correlation with mite feeding damage scores within the 10 varieties than either factor alone. We conclude that 1-Octen-3-One has a role in resistance of subclover cotyledon to the mite.