Results 241 to 250 of about 28,859 (302)

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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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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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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African Elephant Sesquiterpenes

Journal of Natural Products, 1999
GC-MS analysis of extracts from temporal gland secretions of an African elephant has revealed the presence of several farnesol-related sesquiterpenes. Among these are (E)-2, 3-dihydrofarnesol (3), a bumblebee pheromone not seen before in mammals, and a rare component of a Greek tobacco, drimane-8alpha, 11-diol (4), never observed before in an animal.
T E, Goodwin, E L, Rasmussen, A C, Guinn, S S, McKelvey, R, Gunawardena, S W, Riddle, H S, Riddle   +6 more
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SESQUITERPENE PYRIDINE ALKALOIDS

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
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The first sesquiterpene lactones esterified with a sesquiterpenic acid

Phytochemistry, 1981
Abstract From Hypochoeris glabra two guaianolides esterified with an unusual sesquiterpenic acid were isolated. Proton-catalysed rearrangement of the cyclopropane derivative led to a phenolic acid. The structures were elucidated by high-field 1 H NMR spectroscopy. Further guaianolides were isolated from H. uniflora and Lactuca floridana . These
Ferdinand Bohlmann, Jasmin Jakupovic, Wolf-Rainer Abraham, Christa Zdero   +3 more
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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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Sesquiterpenes

Angewandte Chemie International Edition in English, 1973
AbstractOf the 4000 or so terpenoid natural products known today, whose carbon skeleton can be divided up into isopentane units by the “isoprene rule” (C10, monoterpenes; C15, sesquiterpenes; C20, diterpenes; C25, sesterterpenes; C30, triterpenes; steroids; carotenoids; polyprenes), the sesquiterpenes, numbering about 1000, represent the largest single
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Hepatotoxicity of monoterpenes and sesquiterpenes

Archives of Toxicology, 2017
Public interest in natural therapies has increased significantly over past decades. Herbs and herbal products are extensively consumed worldwide and they are generally considered as safe. However, this may not always be true as many cases of herb-induced liver injury are reported every year.
Tomáš Zárybnický, Iva Boušová, Martin Ambrož, Lenka Skálová   +3 more
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Elemanolide sesquiterpenes and eudesmane sesquiterpene glycosides from Centaurea hierapolitana

Phytochemistry, 2007
Two elemanolide sesquiterpenes and two eudesmane-type sesquiterpene glycosides named hierapolitanins A-D, were isolated, together with five known compounds, two flavones; hispidulin and jaceosidin, a flavon-C-glycoside, shaftoside, a flavonol glycoside, kaempferol-3-O-rutinoside and a neolignan, dehydrodiconiferyl alcohol from the aerial parts of ...
Karamenderes, Canan, Bedir, Erdal, Pawar, Rahul, Baykan, Sura, Khan, Khas A.   +4 more
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