Re: [ccp4bb] Guard columns from FPLC

2014-09-17 Thread Engin Özkan
I have two small points to add to what has been amply said already. First, those columns (like the pre-filter 6000) are nice to use with ion-exchange or metal affinity columns on FPLCs, attached right after a superloop. Not gel filtration columns. Second, for small samples loaded on gel filtrat

Re: [ccp4bb] Guard columns from FPLC

2014-09-17 Thread Karl-Magnus Larsson
Dear Anita, As has been stated in another post I think, it is not a good idea to use a guard column in front of a Superdex column or any gel filtration column. It will dilute the sample and decrease the resolution and depending on the nature of the aggregate and guard column it might just clog.

Re: [ccp4bb] Guard columns from FPLC

2014-09-16 Thread Katherine Sippel
I think the typical Akta configuration has the prefilter installed after the mixing pump, but before the sample loop. That is where it is on mine at least. It wouldn't stop sample precipitate from loading on the column. Technically, it would probably still work if you installed the prefilter after

Re: [ccp4bb] Guard columns from FPLC

2014-09-16 Thread Scott Pegan
Anita, >From your description, you most likely are looking for a prefilter6000. http://www.gelifesciences.com/webapp/wcs/stores/servlet/productById/en/GELifeSciences/18458201 Scott Scott D. Pegan, Ph.D. Associate Professor Pharmaceutical and Biomedical Sciences College of Pharmacy University o

Re: [ccp4bb] Guard columns from FPLC

2014-09-16 Thread Nadir T. Mrabet
Well, Pharmacia (now, GE) used to sell such a guard column for FPLC prior to Akta. And I remember buying adaptors to be able to connect the guard column and FPLC columns to an HPLC system. So all the tools exist. But keep in mind that a guard column volume must in all cases be kept minimal to a

Re: [ccp4bb] Guard columns from FPLC

2014-09-16 Thread Christian Roth
Hi Anita, never heared about Guard columns for Superdex columns. These guard columns are usually for HPLC columns (RP) or Silica High pressure gelfiltration columns like from Tosoh Bioscience and part of the acutal column itself, though replaceable. Christian Am 16.09.2014 09:29, schrieb An