Doxycycline - (Nov/13/2013 )

Does someone know how long is doxycyline is stable (as a inducer) in the cell culture. Or If I have to prolong the expression should I change the media after 24 hrs and used the fresh media with fresh induction or let it grow in the same media???

I think it is pretty stable - I was once using a Tet-inducible system (tet and dox are interchangeable) and needed to get Tet-free FBS before the system would switch off.  FBS had been through all the processing steps required to get it to the lab and it still had some activity.