separation of quaternary ammonium surfactnats

[surfactant]

well i amm trying to separate a diquaternary surfactant from a monoquaternary surfactant by preparative gravity column chromatography. And iam trying mixtures ofacetonitrile and acetone with liquor ammonia with little success. Any ideas and suggestions please[/b]

[Mark Tracy]

These stick firmly to silica gel at alkaline pH by ion exchange, and to residual silanols on reversed phase columns. Once, just to prove a point, I made a "reversed phase" column by coating silica gel with hexadecyl-trimethyl-ammonium. To elute the surfactants you will want to lower the pH to protonate the silica.

[surfactant]

thanks dear mark
i will try it out in the lab and come back

[james little]

might find some useful info in

http://www.polysurfacesbookstore.com/pages/3153.html

Analysis of Surfactants, 2nd Ed by Thomas Schmidt

[surfactant]

dear sailor
i did refer this books concerning analysis of surfactants but got nothing substantial out of it