Results 181 to 190 of about 9,505 (220)

Ovatifolin, a sesquiterpene lactone

Journal of Crystal and Molecular Structure, 1977
Ovatifolin, C17H22O5, is a sesquiterpene lactone isolated from the aerial parts ofPodanthus mitiqui Lindl. (Compositae) collected near Pichidangui, Chile. Extracts of the plant exhibit cytotoxic activity against KB cell cultures. The pale yellow crystals belong to the orthorhombic space groupP212121 with cell dimensionsa = 8.159(1),b = 6.640(1), andc =
M. Hoeneisen, E. M. Gopalakrishna, William H. Watson, Mario Silva   +3 more
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Sesquiterpene lactones from Artemisia mongolica

Phytochemistry, 2022
Twelve undescribed sesquiterpene lactones and seven known sesquiterpene lactones were isolated from the whole plant of Artemisia mongolica. Their structures were elucidated based on the interpretation of NMR, HRESIMS, and electronic circular dichroism (ECD) data.
Ziwei Zhu, Ablajan Turak, Haji Akber Aisa   +2 more
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Sesquiterpene lactones of Centaurea scoparia

Phytochemistry, 1998
From the ethanolic extract of the aerial parts of Centaurea scoparia four new sesquiterpene lactones, belonging to the guaiane class, were isolated and identified, together with a known germacranolide. The structures were elucidated by spectroscopic methods including one- and two-dimensional NMR studies.
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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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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 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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