Liquid exclusion-adsorption chromatography: new technique for isocratic separation of nonionic surfactants. I. Retention behaviour of fatty alcohol ethoxylates.
A new technique of liquid chromatography is described, which allows a baseline separation of fatty alcohol ethoxylates with 15-20 ethylene oxide units under isocratic conditions. The new method is based on a combination of two different chromatographic modes for the individual structural units: size exclusion for the poly(oxyethylene) chain and adsorption interaction for the hydrophobic end fragments. A theory is provided for this mixed exclusion-adsorption mode of liquid chromatography. Chromatographic data are found to be in a good agreement with this theory.
Institute of Chemistry, Karl-Franzens-University, Graz, Austria. trathnig@kfunigraz.ac.at
B
B
Trathnigg
A
A
Gorbunov
D000327:Adsorption; D002853:Chromatography, Liquid / Q000379:methods*; D005233:Fatty Alcohols / Q000302:isolation & purification*; D013501:Surface-Active Agents / Q000737:chemistry*
D005233:Fatty Alcohols; D013501:Surface-Active Agents