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  • 1
    Electronic Resource
    Electronic Resource
    Vitamin analysis of five planktonic microalgae and one macroalga (1991)
    Springer
    Journal of applied phycology 3 (1991), S. 259-264 
    Details
    ISSN: 1573-5176
    Keywords: vitamin analysis ; HPLC ; algae ; Tetraselmis suecica ; Isochrysis galbana ; Pavlova lutheri ; Skeletonema costatum ; Chaetoceros calcitrans ; Sargassum muticum ; cosmetology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vitamin analysis was carried out on five microalgae used in aquaculture:Tetraselmis suecica, Isochrysis galbana, Pavlova lutheri, Skeletonema costatum andChaetoceros calcitrans and one macroalga,Sargassum muticum, which is invasive on the Atlantic shores of France. Both liposoluble (provitamin A, E, K) and hydrosoluble (B1, B2, B6, B12, C, PP) vitamins were quantified. For most of them, greater amounts were obtained in the algal products than in the usual sources. On a dry weight basis,Tetraselmis suecica contained 4280 μg g−1 provitamin A and 6323 μg g−1 vitamin E,Pavlova lutheri 1162 μg g−1 vitamin B12 and 837 μg g−1 vitamin C,Isochrysis galbana 2690 μg g−1 vitamin PP and 183 μg g−1 vitamin B6, andSkeletonema costatum 710 μg g−1 vitamin B1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003584
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  • 2
    Electronic Resource
    Electronic Resource
    Free amino acid analysis of five microalgae (1998)
    Springer
    Journal of applied phycology 10 (1998), S. 131-134 
    Details
    ISSN: 1573-5176
    Keywords: Free amino acids ; HPLC ; microalgae ; Tetraselmis suecica ; Isochrysis galbana ; Thalassiosira sp. ; Skeletonema costatum ; Chaetoceros calcitrans ; cosmetology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The HPLC separation of fluorescent o-phtaldialdehyde (OPA) derivatives has been applied to the assay of free amino acids from five microalgae commonly used in aquaculture: Tetraselmis suecica, Skeletonema costatum, Chaetoceros calcitrans, Thalassiosira sp. and Isochrysis galbana, as part an assessment of their potential use in cosmetic products. Thirteen free amino acids were analyzed using High Performance Liquid Chromatography. There were considerable differences between species. However, four amino acids were responsible for more than 60% total concentration in all species: ASP, GLU, ARG and TYR; the next most important (accounting for less than 30%) were: ALA, VAL, PHE and LYS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008003016458
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  • 3
    Electronic Resource
    Electronic Resource
    Relative stability of crowded isomeric enols: 2-Mesityl-2-phenylethenols and their methyl ethers (1993)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 6 (1993), S. 233-242 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The structure of 2-mesityl-2-phenylethenol (7) obtained by reduction of mesityl phenyl ketene with LiAlH4 and by acid-catalysed rearrangement of 1-mesityl-2-phenylethylene glycol was determined by x-ray crystallography to be Z [(Z)-7]. In contrast with a literature report, the reduction of 2-acetoxy-2-mesityl-2-phenylacetaldehyde did not provide the E isomer [(E)-7], but a mixture of (Z)-7 and 2-mesityl-2-phenylethenol. An (E)-7-(Z)-7 mixture of 1:5 was obtained starting from pure (Z)-7 at 80°C in dimethyl sulphoxide. The lower stability of (E)-7 was ascribed to higher steric effects due to a smaller Ph-C=C compared with Mes-C=C torsional angle and a preferred intramolecular π(Mes)-OH in (Z)-7 over π(Ph)-OH hydrogen bonding. In order to dissect the effects, the corresponding 2-mesityl-2-phenylvinyl methyl ethers (E)-15 and (Z)-15, where hydrogen bonding is absent, were prepared and equilibrated in chlorobenzene. The (Z)-15: (E)-15 ratio of ca 3:1 between 58° and 132° (ΔG=0·8 kcal mol-1) gives ΔH ≈ 0·6 kcal mol-1 and ΔS ≈ 0·5 e.u. It was concluded that steric effects contribute ca 1 kcal mol-1 and hydrogen bonding ca 1·5 kcal mol-1 to the higher stability of (Z)-7 over (E)-7. The unknown mesitylphenylacetaldehyde 16 was obtained from (Z)-7 at 135°C in 31% yield.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610060407
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  • 4
    Electronic Resource
    Electronic Resource
    Enol cation radicals in solution. 4. An improved Synthesis of 4,6,7-Trimethylbenzofurans by oxidation of β-mesityl substituted enols (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 325-329 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An improved synthetic access for the construction of 4,6,7-trimethylbenzofurans (B1-B8) through the one-electron oxidation of mesityl-substituted enols (E1-E8) is presented. The transformation can be accomplished in good to excellent yields by using various oxidants; i.e. tris(1,10-phenanthroline)iron(III) hexafluorophosphate, FeCl3, Ce(NH4)2(NO3)6, Cu(OTf)2/Cu2O or anodic oxidation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360409
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