If you are simply doing an SDS gel, then you could dissolve in loading buffer (SDS or LDS). If that doesn't work, then dissolving in 4 to 8 M urea would surely work.
I would like to measure the protein with BCA before the SDS gel, so this Urea buffer, it is just urea? or a mix with other things (tiourea/sds/...)
Thanks thanks thanks so much!