Are substrate assays your forte? Here is one for you.
I want to use an Fmoc...~Na (heptapeptide) substrate in a liquid
enzyme assay. I want to make a stock solution of 1.0mM (or
greater) and use it at a final concentration of 0.8mM in the assay.
I have tried to solubilize it in 20mM and 50mM TRIS, at pH 6.0, 6.5
and 7.0. I have tried the same with 50mM KH2PO4. The results
showed higher solubility in both buffers at pH 6.5. I have also
tried using DMSO up to a final concentration of 8%, this does not
solubilize it either. If you have any input, it would be greatly
