Results 131 to 140 of about 5,436 (188)

Sesquiterpene Lactone Allergy

American Journal of Contact Dermatitis, 1996
Sesquiterpene lactones are a large, diverse group of chemicals found in several plant families that cause allergic contact dermatitis. The biological, botanical, allergenic, and structural significance of sesquiterpene lactones is explored as well as the clinical characteristics of cutaneous reactions.
E M, Warshaw, K A, Zug
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Sesquiterpene Lactones as Allelochemicals

Journal of Natural Products, 2006
Six new sesquiterpene lactones, annuolide H (3), helivypolides F, H-J (4, 11-13), and helieudesmanolide A (6), together with known compounds, were isolated from polar bioactive fractions of Helianthus annuus cv. SH-222 and Stella fresh leaf water extracts.
Macias, Francisco A., Fernandez, Adriana, Varela, Rosa M., Molinillo, Jose M. G., Torres, Ascension, Alves, Pedro L. C. A.   +5 more
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Metabolism of antimalarial sesquiterpene lactones

Pharmacology & Therapeutics, 1990
Metabolism of artemisinin derivatives, which are antimalarial sesquiterpenes, appeared to lead to the production of the more polar metabolites in general. Presence of the endoperoxide moiety in the A/B ring structure seems crucial for the expression of antimalarial activity of these compounds.
I S, Lee, C D, Hufford
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Sesquiterpene lactones from Lugoa revoluta

Biochemical Systematics and Ecology, 2001
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Triana, Jorge, Eiroa, Joseé L., Lopez Sanchez,Mariana, Ortega, Juan J., González, Antonio G., Bermejo Barrera,Jaime   +5 more
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Sesquiterpene lactones in chemotaxonomy

Phytochemistry, 1966
Abstract The utilization of guaianolides in chemotaxonomy is discussed, and some biosynthetic considerations are advanced.
Cornelius Steelink, Jeffrey C. Spitzer
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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 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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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 =
E. M. Gopalakrishna, W. H. Watson, M. Hoeneisen, M. Silva   +3 more
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Sesquiterpene Lactone Mix

2003
The sesquiterpene lactone mix (SL mix) consists of 3 allergens: alantolactone, costunolide, dehydrocostus lactone.
Paulsen, E., Andersen, K.E.; id_orcid 0000-0002-6181-824X   +1 more
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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.
Ferdinand Bohlmann, Rajinder K. Gupta, Jasmin Jakupovic   +2 more
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