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  • CH2 rock and skeletal stretch  (1)
  • Calf  (1)
  • Hydrophobic chains  (1)
  • Key words Gemini surfactant  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Raman scattering spectra of Aerosol-OT homologous sodium dialkylsulfosuccinates and the environment of their hydrophobic chains (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 947-956 
    Details
    ISSN: 1435-1536
    Keywords: Key words Raman spectra ; Sodium dialkylsulfosuccinates ; Hydrophobic chains ; Environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A homologous series of sodium dialkylsulfosuccinates (SDAS) has been synthesized with various chain lengths (dibutyl, dihexyl, diheptyl, dioctyl, dinonyl, didecyl, diundecyl and didodecyl). These compounds are straight-chain analogues for Aerosol-OT. Raman scattering spectra have been recordered for these SDAS compounds, both in the solid state and in aqueous solutions. These spectra are analyzed in detail in the CH stretch and CH2 deformation regions, and the results depend specifically on the length of the hydrocarbon chain. In particular, the longitudinal accordion-like vibrational modes coming from the all-trans n-alkyl chains have been investigated. For the SDAS dihydrates, all hydrocarbon chains take up an extended form, whereas for the monohydrates the tails tend to become disordered at the CH2-CH2 single bond close to the terminal methyl groups. It has also been confirmed that for the concentrated aqueous SDAS (sodium dibutylsulfosuccinate – sodium dioctylsulfosuccinate) samples preferential stabilization of the extended conformation of the hydrocarbon chain may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050474
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  • 2
    Electronic Resource
    Electronic Resource
    Raman scattering study of polyaminopropylsiloxane and its compounds for characterization of 3-aminopropylsilane-modified silica gel. Utility of the CH2 rock and skeletal stretch modes (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 555-560 
    Details
    ISSN: 1435-1536
    Keywords: Key words Raman ; polyamino-propylsiloxane ; GABA ; CH2 rock and skeletal stretch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The Raman scattering spectra for polyaminopropylsiloxane (poly-APS) samples in the solid state and in aqueous solution and for the related compounds, γ-aminobutyric acid (GABA) and its hydrochloride salt (GABA ⋅ HCl), have been examined in the CH2 rock and skeletal stretch region. The Raman spectrum of the solid poly-APS sample may be accounted for by direct combination of the Raman spectra for GABA and GABA ⋅ HCl, whose crystal structures have been elucidated by a single-crystal X-ray diffraction study, suggesting that the APS segments of poly-APS in the solid state are in a conformationally ordered state. It has also been found that the Raman spectra of the solid and aqueous poly-APS samples in this region are useful for diagnosing the conformations of APS moieties bound onto the surface of silica gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050118
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  • 3
    Electronic Resource
    Electronic Resource
    Small-angle neutron-scattering study and micellar model of the gemini (phenylenedimethylene)bis(n-octylammonium)dibromide surfactant micelles in water (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 361-371 
    Details
    ISSN: 1435-1536
    Keywords: Key words Gemini surfactant ; Small-Angle Neutron-Scattering ; Micellar model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure of the micelles formed in aqueous solution by gemini surfactants with aromatic spacers, [Br(CH3)2N+(C m H2 m +1)-(Ph)-(C m H2 m +1)N+(CH3)2Br, m=8 and Ph = o-, m- or p-phenylenedimethylene] has been examined by small-angle neutron scattering. Aggregation of the gemini surfactants with an o-phenylenedimethylene spacer brings about formation of premicelles and small micelles at concentrations below the second critical micelle concentration, while above this concentration marked micellar growth and variation in shape occurs. It is suggested that the minimum aggregate formed at this critical micelle concentration may be the trimer or tetramer and that this result supports the mechanism of “gemini → submicelle → assembly” for micellar growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050393
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  • 4
    Electronic Resource
    Electronic Resource
    Calf pregastric lipase catalyzed hydrolysis of short and medium chain-length monoacid triglycerides: Temperature, pH and lipid concentration effects (1997)
    Springer
    Colloid & polymer science 106 (1997), S. 188-191 
    Details
    ISSN: 1435-1536
    Keywords: Calf ; pregastric lipase ; tributyrin ; monoacid triglycerides ; Michaelis ; Menten parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The commercial extract from the oro-pharyngeal tissues of calf has been used as the source of pregastric lipase and has been processed to yield a partially purified sample of the pregastric lipase. The activity of this lipase against the short-chain lipid tributyrin has been determined over a range of pH and temperature values. Optimum pH conditions were within the range 5.7–6.4 and the optimum temperature was within 37–48 °C. The lipase was also used to catalyze the hydrolysis of monoacid triglycerides (C4∶0–C12∶0) at 40 °C, pH 6.0 and maximum activity was obtained against tributyrin (C4∶0). The values of the kinetic parameterK m increase with increasing carbon-chain length of the carboxylic moiety on the triglycerides, thus, indicating a preference for tributyrin under the stated conditions. The results are compared with results previously obtained utilising goat, kid and lamb pregastric lipases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189518
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