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1977 (1)
1Author    DouglasL. Dorset, AnthonyJ. HancockRequires cookie*
 Title    Glycerol Conformation and the Crystal Structure of Lipids. I. An Electron Diffraction Study of Tripalmitin and Conformationally Fixed Analogs  
 Abstract    Transmission electron diffraction is used as a qualitative analytical probe of poly methylene chain packing in three conformationally-restricted analogs of tripalmitin derived from configura­ tional isomers of cyclopentane-l,2,3-triol. The analysis demonstrates that the all trans "tuning-fork" conformation seen in X-ray crystal structure analyses on homologous compounds is also found in microcrystals, in contrast to a proposal by Fringeli et al. (Z. Naturforsch. 27 b, 780 [1972]) that an all cis conformation of the triglyceride exists in solvent-grown microcrystals and in multilayers. The presence of mixed polymorphs is also shown for bulk samples previously examined by X-ray powder diffraction techniques by other workers. 
  Reference    (Z. Naturforsch. 32c, 573 [1977]; received March 28 1977) 
  Published    1977 
  Keywords    Triglycerides, Crystal Structure, Electron Diffraction 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0573.pdf 
 Identifier    ZNC-1977-32c-0573 
 Volume    32 
2Author    DouglasL. Dorset, WalterA. Pangborn, AnthonyJ. Hancock, TonC. Van Soest, S. M. GreenwaldRequires cookie*
 Title    Glycerol Conformation and the Crystal Structure of Lipids II. A Further Study of Tripalmitin and Conformationally Fixed Analogs by Small-Angle X-Ray Diffraction and Reflection Electron Diffraction  
 Abstract    The utility of analogs to glycerol-containing lipids based on the configurational isomers of cyclo-pentane-l,2,3-triol for ab initio crystal structure analysis via electron diffraction is assessed further. Such analogs of tripalmitin are examined with the natural triglyceride via low angle X-ray diffrac­ tion. The 1,3/2 (all-irarcs) and 1,2/3 (cis-trans) analogs give long spacing dimensions some 23 Ä greater than found for the ß-2 form of the natural compound, consistent with the long spacing observed for a ß-3 form. The 1,2,3/0 (all-cis) analog gives a long spacing near that of the a-form of the triglyceride. Reflection electron diffraction measurements on the 1,3/2 and 1,2/3 analogs reveal a chain tilt near 60° for both and untilted chains for 1,2,3/0. A more accurate tilt determina­ tion from X-ray long spacings of the homologous series of 1,3/2 pseudotrilaurin to 1,3/2 pseudo-tripalmitin confirm the 67° tilt expected for the ß-3 form. Therefore, given the same T,, methylene subcell, the molecular packing is very close to natural triglycerides. The subtle influences of the cyclopentane ring are overcome for 1,3/2 analogs based on stearic and arachidic acids. This emphasizes the utility of these structural analogs for ab initio crystal structure determinations of glycerol containing lipids. 
  Reference    Z. Naturforsch. 33c, 50 (1978); received October ll/November 28 1977 
  Published    1978 
  Keywords    Triglycerides, Crystal Structure, X-Ray Diffraction, Electron Diffraction 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0050.pdf 
 Identifier    ZNC-1978-33c-0050 
 Volume    33 
3Author    R. G. Berger, K. Neuhäuser, F. DrawertRequires cookie*
 Title    Biosynthesis of Flavor Compounds by Microorganisms 6. Odorous Constituents of Polyporus durus (Basidiomycetes)  
 Abstract    The neutral volatile constituents produced by shake flask cultured mycelium of Polyporus durus comprise aliphatic and aromatic alcohols, lactones and various carbonyl compounds, and sesquiterpenoids. The occurrence of five 2,3-unsaturated 4-olides (y-lactones), some of which were identified for the first time in nature, is characteristic of the fungus. The presence of a synthetic triglyceride in the nutrient medium strongly favors the formation of lactones and other volatile flavor compounds. 
  Reference    Z. Naturforsch. 41c, 963 (1986); received July 21 1986 
  Published    1986 
  Keywords    Polyporus durus, Basidiomycetes, Flavor, Lactones, Triglyceride 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0963.pdf 
 Identifier    ZNC-1986-41c-0963 
 Volume    41 
4Author    A. Radunz3, P. H. Eb, G. H. Schmid3Requires cookie*
 Title    Analysis of the Seed Lipids of Aleurites montana  
 Abstract    The seed lipids of the Chinese tung-oil tree Aleurites montana are composed of 97.2% triglycerides, 2% phospholipids and of 0.8% glycolipids. In the triglycerides 67% of all fatty acids are a-eleostearic acid (configuration C 18:3, A9 cis, A11 trans, A 13 trans). This acid is bound in the triglycerides in the 1,3 position. Via mercury Il-acetate adducts and subsequent chromatography on silica gel a separation of this fatty acid from the seed fatty acids is possible. By this procedure an a-eleostearic acid-free tung-oil mixture is obtained, which consists by one half of C i8:2, 25% of C 18:1 and by 25% of the saturated fatty acids C 16;0, C 18:0 and 
  Reference    Z. Naturforsch. 53c, 305 (1998); received February 5/March 6 1998 
  Published    1998 
  Keywords    Aleurites montana, Tung Oil, a-Eleostearic Acid, Triglycerides, Phospholipids 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0305.pdf 
 Identifier    ZNC-1998-53c-0305 
 Volume    53 
5Author    Jürgen Jacob, Hans-Peter HanssenRequires cookie*
 Title    The Chemical Composition of Cuticular Lipids from Dragonflies (Odonata) A h rensburg/Holst, and  
  Reference    Z. Naturforsch. 34c, 498—502 (1979); received March 20 1979 
  Published    1979 
  Keywords    Cuticular Lipids, Branched Hydrocarbons, Waxes, Triglycerides, Free Fatty Acids, Insects, D ra­ gonflies, Chem otaxonom y 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0498.pdf 
 Identifier    ZNC-1979-34c-0498 
 Volume    34