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Effects of some natural volatile compounds on the pathogenic fungiAlternaria alternata andBotrytis cinerea (1992)

Hamilton-Kemp, T. R. ; McCracken, C. T. ; Loughrin, J. H. ; [et al.]

Springer

Journal of chemical ecology 18 (1992), S. 1083-1091

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ISSN: 1573-1561

Keywords: Headspace ; aldehydes ; E-2-hexenal ; monoterpenes ; lipoxygenase ; spores ; hyphae ; wounding ; Lycopersicon esculentum ; Alternaria alternata ; Botrytis cinerea

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract A bioassay system was developed to test the effects of volatile compounds on the growth of hyphae from germinating fungal spores. Volatiles from crushed tomato leaves inhibited hyphal growth of two fungal pathogens,Alternaria alternata andBotrytis cinerea. Aldehydes, including C6 and C9 compounds formed by the lipoxygenase enzyme pathway upon wounding leaves, inhibited growth of both fungal species. Terpene hydrocarbons, 2-carene and limonene, had no significant effect on hyphal growth. The quantities of volatile compounds in the vapor phase of the bioassay system were measured by direct headspace sampling and GC analysis.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00980064

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The mass spectra of some triterpenoid dehydration products (1969)

Elgamal, M. H. A. ; Fayez, M. B. E. ; Kemp, T. R.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 2 (1969), S. 175-194

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ISSN: 0030-493X

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The mass spectra of ten dehydration and solvolysis products obtained from β-amyrin and glycyrrhetic acid were studied. With the exception of those resulting from ‘backbone’ rearrangement, they exhibited conventional fragmentation due to the ring C chromophore, like the parent alcohols. Only those products with a contracted ring A suffered loss of an isopropyl radical. In the latter type, special fragmentation features were exhibited by the isopropylcyclopentene and by the isopropylidene products. These differences enabled the assignment of probable structures for two unknown derivatives.

Additional Material: 12 Ill.