Results 221 to 230 of about 84,172 (271)

Contact Dermatitis Caused by Sesquiterpene Lactones

Dermatitis, 1998
Compositae dermatitis involves workers such as gardeners, florists, and farmers, and less commonly people not employed in occupations at risk.To report a case of contact sensitization caused by Compositae, the source of sensitization being both pesticides and plants.A 65-year-old man, whose hobby was gardening, was affected by a chronic eczema of the ...
Colombina Vincenzi, Liliana Guerra, Elisa Spettoli, Simonetta Silvani, Pasquale Lucente   +4 more
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Review of the analytical techniques for sesquiterpenes and sesquiterpene lactones

Journal of Chromatography A, 2002
In this paper the analytical techniques of about the last 2 decades for sesquiterpenes including their lactones are reviewed. For sesquiterpenes, methods like GC, GC-EI-MS, GC-CI-MS, GC-MS-MS, GC-FT-IR, GC-UV, GC-AES, 13C-NMR, PY-GC-MS, HPLC, HPLC-TSP, SFE, SFC, SFC-UV are available, GC combined with MS is the most widespread.
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Sesquiterpene Lactones in Compositae [PDF]

, 1971
The degree to which modern techniques of chemical analysis and structure determi1nation have contributed to the development of our knowledge of plant constituents is aptly illustrated by considering recent developments in sesquiterpene chemistry. Comparison of the relatively small sesquiterpene section in Simonsen’s classic treatise1) with the ever ...
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Sesquiterpene lactones.

Phytochemistry, 1967
Abstract Hymenoclea salsola T. and G. (fam. Compositae, tribe Ambrosieae) contains ambrosin (1), neo-ambrosin (III), coronopilin (IV), dihydrocoronopilin (V), and ilicic acid (II), as well as several additional compounds still to be characterized. The close phylogenetic relationship of Hymenoclea and Ambrosia species indicated by morphological ...
T.A. Geissman, F.P. Toribio
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Sesquiterpene Lactone Composition of Wild and Cultivated Sunflowers and Biological Activity against an Insect Pest.

Journal of Agricultural and Food Chemistry, 2015
Sesquiterpene lactones in sunflowers, Helianthus spp., are important to interactions with pathogens, weeds, and insects. Across a broad range of Helianthus annuus, differences in composition of sesquiterpene lactones extracted from disc florets were ...
J. Prasifka, O. Spring, J. Conrad, L. W. Cook, D. Palmquist, M. E. Foley   +5 more
semanticscholar   +1 more source

A further sesquiterpene lactone esterified with a sesquiterpenic acid

Phytochemistry, 1982
Abstract The roots of Hypochoeris oligocephala afforded in addition to known compounds a further sesquiterpene lactone esterified with a sesquiterpenic acid as well as the corresponding free acid.
Rajinder K. Gupta, Jasmin Jakupovic, Ferdinand Bohlmann   +2 more
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Evolution of sesquiterpene lactones in asteraceae [PDF]

Biochemical Systematics and Ecology, 1986
Abstract The two basic micromolecular phenomena which accompany the introduction of a novel lineage in angiosperms, vigorous increase in oxidation state of allelochemics and reduction of the number of major biosynthetic routes, are shown to characterize the evolutionary development of sesquiterpene lactones in tribes of Asteraceae.
Leonora M.A. Comegno, O. R Gottlieb, Coelho Kaplan, Maria Renata de M. Bonfanti, Zenaide S. Ferreira, Vicente de Paulo Emerenciano, Maria Auxiliadora   +6 more
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Sesquiterpene lactones from Achillea crithmifolia

Phytochemistry, 1991
Abstract The isolation of guaianolides rupicolin-A, rupicolin-B, their acetates and a new germacranolide 1β,10α-epoxy-3β,9β-diacetoxy-11α,13-dihydrocostunolide, identified by means of PS DQF COSY and PS NOESY, from Achillea crithmifolia is reported. A flavonoid jaceidin was also isolated from the same extract.
Milosavljević, Slobodan, Macura, Slobodan, Stefanović, Milutin, Aljančić, Ivana, Milinković, Darinka   +4 more
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Sesquiterpene Lactones Revisited

1995
Sesquiterpene lactones are plant constituents often possessing a bitter taste which are common in most tribes of the Asteraceae (Compositae) and also are found in at least 14 other angiosperm families and to a limited extend in gymnosperms, liverworts and fungi.1 There are more than 4,000 known structures in this class of plant secondary metabolites ...
Cesar M. Compadre, John M. Pezzuto, J. Thor Arnason, Robin J. Maries, Elzbieta Bloszyk, Liliana Pazos-Sanou   +5 more
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Sesquiterpene lactones from Laserpitium gallicum

Phytochemistry, 1986
The roots of Laserpitium gallicum gave large amounts of the acetylene falcarindiol and four mixtures of sesquiterpene lactone diesters, whose structure was established by spectral data and chemical reactions.
Giovanni Appending, Maria Grazia Valle, Rosamaria Caniato, Elsa Maria Cappelletti   +3 more
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