NEEDED: micro-solid phase extraction column

[Michael A. Strausbauch]

I saw a advertisment for a solid phase extraction cartridge, but on a
micro-scale. I thought they were called "micro-SPE" tips or something
like that. They were reverse phase C18 contained in a micro pipet tip.
A mini Sep-Pak. 

Anyone who knows of a source or manufacture for these or a similar
product please let me know.

Thanks in advance, Mike   

Michael A. Strausbauch          strausbauch.michael at mayo.edu