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  • Articles  (4)
  • Analytical Chemistry and Spectroscopy  (2)
  • gelatin  (2)
  • 2020-2022
  • 1995-1999
  • 1985-1989  (4)
  • 1970-1974
  • 1
    Electronic Resource
    Electronic Resource
    The modification of the triple helical structure of gelatin in aqueous solution I. The influence of anionic surfactants, pH-value, and temperature (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 1061-1067 
    Details
    ISSN: 1435-1536
    Keywords: Circular dichroism ; gelatin ; sodium alkyl sulphates ; aqueousgelatinsolutions ; secondary structure ; pH ; temperature
    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 modification of the triple helical structure in aqueous gelatin solutions by changing pH and adding alkyl sulphates at 298 K and after rechilling the solution to 283 K was investigated by CD-measurement. At 298 K the triple helical content at the IEP of the gelatin has its maximum value. It is only weakly affected by adding sodium dodecyl sulphate (SDDS) at concentrations 〈10−4 M/dm3. The unfolding of the triple helix affected by pH and SDDS is reversible by rechilling the solution. The triple helical content of gelatin solutions decreases at SDDS concentrations higher than 10−4 M/dm3. In all cases the decrease of the amount of triple helical structure is connected with an increase of the cis-configuration in single chains and leads to chain reversals. At sufficiently high SDDS concentrationsβ-sheets are formed. These changes are thermally irreversible. Sodium decyl sulphate (SDS) has a more minor influence than SDDS except in the range of the c.m.c. of SDS. At sufficiently high SDS concentrations,β-turns appear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01428818
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  • 2
    Electronic Resource
    Electronic Resource
    The modification of the triple helical structure of gelatin in aqueous solution 3. The influence of nonionic surfactants (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 516-519 
    Details
    ISSN: 1435-1536
    Keywords: Circulardichroism ; gelatin ; nonionicsurfactants
    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 Using CD-measurements the influence of nonionic surfactants (dodecyl polyoxyethylene, ethoxylated para tert. octyl phenol, commercial nonionic WON 100 and octyl diethyl phosphinoxid) on the secondary structure of gelatin in aqueous solutions was investigated. At surfactant concentrations smaller than the c.m.c. the triple helical content of the gelatin is increased. At concentrations exceeding the c.m.c. the triple helical content decreases. Chain reversals of the peptide chains after the destruction of the triple helical structure were shown to appear in acidic environment at 298 K. This destruction is reversible by rechilling the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416058
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  • 3
    Electronic Resource
    Electronic Resource
    HRGC effluent splitter for solvent peak suppression (heart cutting) and multiple detection (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 357-359 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Fused silica capillary columns ; Effluent splitter ; Heart cutting ; Multiple detection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240080707
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  • 4
    Electronic Resource
    Electronic Resource
    Raman spectra of agyrodites, M6PS5X (M = Cu and Ag; X = Cl, Br and I), and some related thiophosphates (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 17 (1986), S. 217-219 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of copper and silver agyrodites containing different halides were studied. The observed spectra are very similar to those of copper and silver thiophosphates. The spectra were interpreted as resulting from internal modes of the tetrahedral thiophosphate anion, PS43-, indicating that these agyrodites can possibly be formulated as triple salts, M3PS4 · M2S · MX (M = Cu and Ag; X = Cl, Br and I), being basically ionic compounds consisting of monoatomic ions with only polyatomic one covalently bonded PS43- anion.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250170211
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