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1985 (1)
1984 (2)
1Author    EckhardW. Ollenw Eber, K. Arin, M. AnnRequires cookie*
 Title    Flavonoid Aglycones in the L eaf Resin o f Som e Cistus Species  
 Abstract    Members o f the genus Cistus excrete a leaf resin that consists mainly o f terpenoids. This resin also contains methylated flavonoids as aglycones. Rare methyl deri­ vatives o f myricetin have been isolated from C. monspeli-ensis, along with uncommon methyl derivatives o f quer-cetin. Further flavonoids encountered in the leaf resin o f this and six further species are methyl derivatives o f kaempferol and quercetin, som e o f apigenin and in one species also o f luteolin. The results indicate that there might exist species-specific flavonoid patterns. 
  Reference    Z. Naturforsch. 39c, 303 (1984); received Decem ber 2 1983 
  Published    1984 
  Keywords    Cistus, Cistaceae, Leaf Resin, Methyl Flavonoids, Aglycones 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0303_n.pdf 
 Identifier    ZNC-1984-39c-0303_n 
 Volume    39 
2Author    W.Dennis Clark, Eckhard WollenweberRequires cookie*
 Abstract    Nineteen flavonoid aglycones have been identified from the external stem and leaf resin of Ericameria laricifolia by thin layer co-chromatography with authentic samples. Kaempferol, quercetin, apigenin, and their methyl ethers have been found, along with luteolin and 6-methoxy luteolin. It is suggested that future flavonoid chemosys-tematic studied of resin-exuding species would best focus on aglycones as opposed to glycosides. Ericameria is a genus of about 20 shrubby, res­ inous species found in the southwestern US and adjacent Mexico. It had been submerged into the large genus, Haplopappus [1], but has been more recently treated at the genus rank once again [2]. Previous chemo-systematic studied have addressed the relationship between Ericameria and other Haplopappus segregates [3], but to a limited extent. 
  Reference    Z. Naturforsch. 39c, 1184—1185 (1984); received July 25 1984 
  Published    1984 
  Keywords    Ericameria laricifolia, Asteraceae, Leaf Resin, 19 Flavonoid Aglycones 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-1184_n.pdf 
 Identifier    ZNC-1984-39c-1184_n 
 Volume    39 
3Author    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