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'Flavonoid Aglycones' in keywords
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1Author    E. WollenweberRequires cookie*
 Title    Exkret-Flavonoide bei Hieracium intybaceum Exudate Flavanoids in Hieraceum intybaceum, an Alpine Hawkweed  
 Abstract    The hawkweed Hieracium intybaceum is covered with glandular trichomes that produce a sticky resinous exu­ date. This material, assumedly o f terpenoid nature, con­ tains trace amounts o f flavonoid aglycones. They could be identified to be known flavones and flavanones. This is the first time that an alpine Asteraceae was found to exude flavonoid aglycones. 
  Reference    Z. Naturforsch. 39c, 833 (1984); received March 26 1984 
  Published    1984 
  Keywords    Hieracium intybaceum, Asteraceae, L eaf Exudate, Flavonoid Aglycones 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0833_n.pdf 
 Identifier    ZNC-1984-39c-0833_n 
 Volume    39 
2Author    E. W. Ollenweber, K. M. Ann, F.J A Rriaga, G. YatskievychRequires cookie*
 Title    Flavonoids and Terpenoids from the Leaf Resin of Pluchea odorata  
 Abstract    The chemical composition of the leaf resin of Pluchea odorata has been studied from material collected in Tamaulipas, Mexico. It mostly consists of triterpenes and phytosterols and an eudes-mane type sesquiterpene. Very small amounts of ten different flavonol aglycones occur, dissolved in this resin; most of them are 6-methoxy compounds. A comparison with previous results on material from El Salvador shows that the latter contains a lesser number of triterpenes and especially of flavonoids, but more sesquiterpenes, while the n-alkane composition varies only quantitatively between both populations. 
  Reference    Z. Naturforsch. 40c, 321 (1985); received November 26 1984/February 13 1985 
  Published    1985 
  Keywords    Pluchea odorata, Asteraceae, Leaf Resin, Flavonoid Aglycones, Terpenoids 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0321.pdf 
 Identifier    ZNC-1985-40c-0321 
 Volume    40 
3Author    EckhardW. Ollenweber3, Ludwig Krautb, RüdigerM. UesbRequires cookie*
 Title    External Accumulation of Biflavonoids on Gymnosperm Leaves  
 Abstract    Biflavonoids are well known to occur in many Gymnospermae. Here we report on their occurrence in epicuticular material of a num ber of species. Several compounds are charac­ terized by detailed NMR studies and FAB-MS. They are identified as amentoflavone, bilobe-tin, podocarpus-flavone A, sciadopitysin, dihydrosciadopitysin and cupressuflavone. 
  Reference    Z. Naturforsch. 53c, 946—950 (1998); received June 29 1998 
  Published    1998 
  Keywords    Gymnospermae, Leaf Exudates, Flavonoid Aglycones, Biflavonoids 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0946.pdf 
 Identifier    ZNC-1998-53c-0946 
 Volume    53 
4Author    KarinM. Valant-Vetschera, EckhardW. OllenweberRequires cookie*
 Title    the Genus Leucocyclus (Compositae)  
 Abstract    The monotypic genus Leucocyclus, consisting of only two subspecies, was investigated for its exudate flavonoids. Major flavonoid aglycones were polymethoxyderivatives of 6-hydroxyflavones and, to a lesser extent, of 6-hydroxy-flavonols. The two subspecies differed in their accumula­ tion trends, but populational variation reduced the signifi­ cance of taxonomic implications. Cultivated material corre­ sponded largely to the original material collected from na­ ture. The accumulation trends of Leucocyclus coincide with those of the closely related genus Achillea. 
  Reference    Z. Naturforsch. 44c, 323 (1989); received August 15. 1988 
  Published    1989 
  Keywords    Leucocyclus (Compositae-Anthemideae), Leaves, Ex­ udates, Flavonoid Aglycones, Polymethoxyderivatives 
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 TEI-XML for    default:Reihe_C/44/ZNC-1989-44c-0323_n.pdf 
 Identifier    ZNC-1989-44c-0323_n 
 Volume    44 
5Author    Eckhard Wollenweber, Marion Dörr, Matthias Beyer3, JamesN. Roitmanb, ChristopherF. PuttoekcRequires cookie*
 Title    Rare Flavonoids from Odixia and Ozothamnus spp. (Asteraceae, Gnaphalieae)  
 Abstract    Representatives of the genera Odixia and Ozothamnus, Australian Asteraceae belonging to the tribe Gnaphalieae, have been analyzed for the presence of flavonoid aglycones accu­ mulated on leaf and stem surfaces. Fiftytwo more or less lipophilic flavonoids have been identified. Methyl ethers of apigenin, luteolin, kaempferol and quercetin are abundant, while rare methyl ethers of isoscutellarein, 8-hydroxy galangin, herbacetin and gossypetin appear to be characteristic. The distribution of rare flavonoids is discussed. 
  Reference    Z. Naturforsch. 52c, 571—576 (1997); received April 1/June 13 1997 
  Published    1997 
  Keywords    Odixia ssp, Ozothamnus ssp, Asteraceae -Gnaphalieae, Lipophilic Exudates, Flavonoid Aglycones 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0571.pdf 
 Identifier    ZNC-1997-52c-0571 
 Volume    52 
6Author    Eckhard Wollenweber, Marion Dörr, M. Atthias Beyer3, Edward Schilling5Requires cookie*
 Title    External Flavonoids of 12 Species of North American Eupatorieae (Asteraceae)  
 Abstract    The flavonoid aglycones excreted by and deposited on aerial parts of 12 species of tribe Eupatorieae, including 10 species of Eupatorium (narrowly defined), Conoclin-ium coelestinum , and Brickellia eupatorioides, have been analyzed. The flavonoid pattern of Eupatorium is domi­ nated by 6-O-m ethylated flavones, and there are rela­ tively few differences between species including those of section Verticillata. In contrast, both Conoclinium and Brickellia were found to have significantly different fla­ vonoid patterns. In Conoclinium, this included more highly O-m ethylated flavones, including the relatively rare compound 5,7,4'-triOH-6,3',5'-triOMe flavone. In B. eupatorioides this consisted of O-methylated flavonols that are a feature previously reported to be characteris­ tic of Brickellia and thus support the placement of the species in this genus. 
  Reference    Z. Naturforsch. 51c, 893—896 (1996); received August 26 1996 
  Published    1996 
  Keywords    Eupatorium ssp, Brickellia eupatorioides, Asteraceae -Eupatorieae, L ipophilic Exudate, Flavonoid Aglycones 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0893_n.pdf 
 Identifier    ZNC-1996-51c-0893_n 
 Volume    51