Reversed-phase chromatographic study of the interaction of non-ionic surfactants with sodium dodecyl sulfate

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Abstract

The interaction of 18 non-ionic surfactants (9 nonylphenylethylene oxide oligomers, containing in average 5, 6, 8, 9, 10, 11, 15, 23 and 30 ethylene oxide groups per molecule, and 9 tributylphenylethylene oxide oligomers, containing in average 4, 6, 8, 10, 11, 13, 18, 30 and 50 ethylene oxide groups per molecule) with the anionic surfactant sodiumdodecylsulfate (SDS) was studied by reversed-phase chromatography, and the relative strength of interaction was calculated separately for each non-ionic surfactant-SDS pair. Stepwise regression analysis was used for the determination of molecular substructures and physicochemical parameters accounting for the interaction. The retention of non-ionic surfactants decreased in the presence of SDS indicating the formation of SDS-non-ionic surfactant complexes. In each instance the SDS-surfactant complex was less hydrophobic than the surfactant itself. The relative strength of interaction increased with increasing specific hydrophobic surface area of surfactants and decreased with increasing number of polar ethylene oxide groups per molecule. This finding indicates that hydrophobic forces are involved in the complex formation and the alkyl chain of SDS is bound to the hydrophobic moiety of surfactants. The relative strength of interaction significantly decreased with the increasing concentration of methanol in the solution, indicating the hydrophobic character of the interaction.

Original languageEnglish
Pages (from-to)33-40
Number of pages8
JournalJournal of Chromatography A
Volume722
Issue number1-2
DOIs
Publication statusPublished - Jan 26 1996

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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