The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Titration of fatty acids in sugar-derived (APG) surfactants: A C-13 NMR study of the effect of headgroup size, chain length, and concentration on fatty acid pKa at a nonionic micellar interface

På svenska

Author

Summary, in English

The pK(a) of a C-13-enriched fatty acid probe, tetradecanoic acid, was investigated in a variety of sugar-derived (APG) surfactants by using C-13 NMR to monitor the chemical environment of the probe during titration with base. There was an increase of approximately 2 pK(a) units for the probe within the micellar systems compared to the value of acetic acid in water. Analysis shows that the interfacial environment of alkylglucoside surfactants is similar to, although slightly more polar than, that of ethylene glycol-derived (EO) nonionic surfactants, and there is no indication that the alkylglucoside surfactants are deprotonated at pH levels between 2 and 10. The average pK(a) of the fatty acid probe in the APGs is measured to be 6.3, and it is argued that this value

s an appropriate choice for pK(a)(0), the intrinsic dissociation constant for an acid at a hydrophobic/hydrophilic interface, when calculating the surface potential of charged systems.

Department/s

Publishing year

2003

Language

English

Pages

1001-1005

Publication/Series

The Journal of Physical Chemistry Part B

Volume

107

Issue

4

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Chemistry

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-5207