Hypersil SAX column chemistry

[Beaker]

Hi. Does anyone know what alkyl group is used to bond the SAX moiety to the silica surface in Hypersil SAX? Have asked Thermo, they weren't too helpful.

Thanks.
Phill

[Uwe Neue]

Don't know for sure, but the common chain length for such things is 3 methylene groups between the silica and the quaternary amine.

[Beaker]

Thanks Uwe. I guessed something similar, I have details of 2 other SAX columns that I'm comparing, but I wonder why Thermo are being so cagey!!?? Never mind, I'll crack on & see what happens!

P