Location of double bonds in long chain esters by mass spectroscopy of methoxyhalogeno derivatives prepared from methoxymercuriacetate adducts

Lipids ◽  
1975 ◽  
Vol 10 (1) ◽  
pp. 55-57 ◽  
Author(s):  
D. E. Minnikin
Keyword(s):  
Mass Spectroscopy ◽  
Double Bonds ◽  
Long Chain

Location of double bonds in long chain esters by methoxymercuration-demercuration followed by mass spectroscopy

Lipids ◽  
1974 ◽  
Vol 9 (3) ◽  
pp. 135-140 ◽  
Author(s):  
D. E. Minnikin ◽  
P. Abley ◽  
F. J. McQuillin ◽  
K. Kusamran ◽  
K. Maskens ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Double Bonds ◽  
Long Chain

scholarly journals Engineering Long-Range Order in Supramolecular Assemblies on Surfaces: The Paramount Role of Internal Double Bonds in Discrete Long-Chain Naphthalenediimides

2020 ◽  
Vol 142 (8) ◽  
pp. 4070-4078 ◽  
Author(s):  
José Augusto Berrocal ◽  
G. Henrieke Heideman ◽  
Bas F. M. de Waal ◽  
Mihaela Enache ◽  
Remco W. A. Havenith ◽  
...  
Keyword(s):  
Long Range ◽  
Supramolecular Assemblies ◽  
Range Order ◽  
Long Range Order ◽  
Double Bonds ◽  
Long Chain

Self-Assembling Structures of Long-Chain Phenyl Glucoside Influenced by the Introduction of Double Bonds

2002 ◽  
Vol 124 (36) ◽  
pp. 10674-10675 ◽  
Author(s):  
Jong Hwa Jung ◽  
George John ◽  
Kaname Yoshida ◽  
Toshimi Shimizu
Keyword(s):  
Double Bonds ◽  
Self Assembling ◽  
Long Chain

scholarly journals Long-chain betulaprenol-type polyprenols from the leaves of Ginkgo biloba

1983 ◽  
Vol 213 (2) ◽  
pp. 305-311 ◽  
Author(s):  
K Ibata ◽  
M Mizuno ◽  
T Takigawa ◽  
Y Tanaka
Keyword(s):  
Chain Length ◽  
Mass Spectroscopy ◽  
Ginkgo Biloba ◽  
Total Lipids ◽  
Isoprene Unit ◽  
Terminal Unit ◽  
Long Chain

A long-chain betulaprenol-type polyprenol mixture was isolated from the leaves of Ginkgo biloba mainly as acetate. The structure was determined by mass spectroscopy, 1H-n.m.r. spectroscopy and 13C-n.m.r. spectroscopy. The mixture contained polyprenols-14-22, predominantly polyprenols-17, -18 and -19, and consisted of the dimethylallyl terminal unit (omega-terminal), two trans-isoprene residues, a sequence of 11-19 cis-isoprene residues and a terminal hydroxylated isoprene unit (alpha-terminal) aligned in that order. The concentration of these polyprenols in leaves increased from 0.04 to 2.0% of dry wt. with maturing of the leaves, though the content of total lipids was constant. The distribution of chain length in these polyprenols showed little variation throughout the whole life of the leaves.

scholarly journals Preparation and properties of long chain branched high-density polyethylene based on nano-SiO2 grafted glycidyl methacrylate

RSC Advances ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 1123-1133
Author(s):  
Lijin Xie ◽  
Xiaokun Liang ◽  
Hongwei Huang ◽  
Le Yang ◽  
Feng Zhang ◽  
...  
Keyword(s):  
High Density Polyethylene ◽  
Glycidyl Methacrylate ◽  
High Density ◽  
Double Bonds ◽  
Nano Sio2 ◽  
Long Chain

A compounded nanoparticle with multiple double bonds (CC) was prepared by grafting glycidyl methacrylate (GMA) onto the surface of nano-SiO2.

scholarly journals Widespread Head-to-Head Hydrocarbon Biosynthesis in Bacteria and Role of OleA

2010 ◽  
Vol 76 (12) ◽  
pp. 3850-3862 ◽  
Author(s):  
David J. Sukovich ◽  
Jennifer L. Seffernick ◽  
Jack E. Richman ◽  
Jeffrey A. Gralnick ◽  
Lawrence P. Wackett
Keyword(s):  
Xanthomonas Campestris ◽  
Gene Deletion ◽  
Shewanella Oneidensis ◽  
Fatty Acyl ◽  
Double Bonds ◽  
Acyl Chains ◽  
Hydrocarbon Biosynthesis ◽  
Structural Alignments ◽  
Long Chain

ABSTRACT Previous studies identified the oleABCD genes involved in head-to-head olefinic hydrocarbon biosynthesis. The present study more fully defined the OleABCD protein families within the thiolase, α/β-hydrolase, AMP-dependent ligase/synthase, and short-chain dehydrogenase superfamilies, respectively. Only 0.1 to 1% of each superfamily represents likely Ole proteins. Sequence analysis based on structural alignments and gene context was used to identify highly likely ole genes. Selected microorganisms from the phyla Verucomicrobia, Planctomyces, Chloroflexi, Proteobacteria, and Actinobacteria were tested experimentally and shown to produce long-chain olefinic hydrocarbons. However, different species from the same genera sometimes lack the ole genes and fail to produce olefinic hydrocarbons. Overall, only 1.9% of 3,558 genomes analyzed showed clear evidence for containing ole genes. The type of olefins produced by different bacteria differed greatly with respect to the number of carbon-carbon double bonds. The greatest number of organisms surveyed biosynthesized a single long-chain olefin, 3,6,9,12,15,19,22,25,28-hentriacontanonaene, that contains nine double bonds. Xanthomonas campestris produced the greatest number of distinct olefin products, 15 compounds ranging in length from C28 to C31 and containing one to three double bonds. The type of long-chain product formed was shown to be dependent on the oleA gene in experiments with Shewanella oneidensis MR-1 ole gene deletion mutants containing native or heterologous oleA genes expressed in trans. A strain deleted in oleABCD and containing oleA in trans produced only ketones. Based on these observations, it was proposed that OleA catalyzes a nondecarboxylative thiolytic condensation of fatty acyl chains to generate a β-ketoacyl intermediate that can decarboxylate spontaneously to generate ketones.

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