The Quantitative Characterization of Chemical Modification of Sodium Dodecyl Sulphate Micellar Solutions and Retention Model in Micellar Liquid Chromatography

Abstract

The micelle solutions of sodium dodecyl sulphate (NaDS) modified by simultaneously presence of different aliphatic alcohols and an inorganic salt have been quantitatively characterized by the values of critical micelle concentrations, the degrees of counter-ion binding and electrostatic potentials of surface. The obtained characteristics of hybrid micelles and the coefficients of modifier distribution between aqueous solution and micellar pseudophase were used to develop a conceptual retention model in micellar liquid chromatography (MLC). The new retention model takes into account the mi-croenvironment changes of an analyte when it goes from the hybrid micellar eluent to a modified surface of alkyl-bounded sorbent. Quantitative Charakterisierung der chemischen Modifikation mi-zellarer Lösungen von Natriumdodecylsulfat und Retentionsmodell in mizellarer Flüssigkeitschromatographie L. Samokhina, L. Loginova und D. Stepanko, Kharkov, Ukraine Tenside Surfactants Detergents 43 (2006) 1, S. 6-11, 5 Bilder, 1 Tabelle, 42 Literaturangaben Die mizellare Lösungen von Natriumdodecylsulfat (NaDS), modi-fiziert durch gleichzeitige Anwesenheit verschiedener aliphatischer Alkohole und eines anorganischen Salzes, wurden durch die Werte der kritischen Mizellbildungskonzentrationen, Grade der Gegen-ionenbindungen sowie der elektrostatischen Oberflächenpotentiale quantitativ charakterisiert. Die erhaltenen Charakteristika hybrider Mizellen und Koeffizienten der Modifikatorverteilung zwischen wäßriger Lösung und mizellarer Pseudophase wurden verwendet, um ein konzeptionelles Retentionsmodell in mizellarer Flüssigkeits-chromatographie (MLC) zu entwickeln. Das neue Retentionsmodell berücksichtigt die Änderungen der Mikroumgebung eines Analyten beim Übergang vom hybrid mizellaren Eluenten zu einer modifizier-ten Oberfläche eines alkylgebundenen Sorbenten. Testing Robustness and Compatibility of Colour Damaging Washing Tests. Part I: Colour Damage Profiles of Bleach Activators and Peroxycarboxylic Acids G. Reinhardt and H. Ulshöfer, Frankfurt/M, Germany Tenside Surfactants Detergents 43 (2006) 1, p. 12-19, 8 figs, 4 tables , 12 literature references A significant aspect when selecting new bleaching agents is their reactivity on dyed textiles. In this paper the colour damaging effect of various the bleach activators are compared with that of tetraacetyl ethylene diamine. The tests were carried out according to ISO 105-C09 (diagnostic single wash test) and a similar test as well as the recently developed colour damaging profile test (20 wash cycles) using the AISE Dye Set. The results confirm that new bleach systems can differ significantly in their reactivity and selectivity towards individual dyeings from the conventional peroxycarboxylic acids or peroxycarboxylic acid generating activators. ISO 105-C09 appears to be suitable for prediction of the effect of conventional peroxycarboxylic acids but shows deficiency in the assessment of new bleach systems such as perimidic acids. Überprüfung der Aussagekraft und Kompatibilität von Farbsc...