Dear Vicky,
thank you very much for the quick and helpful reply. Now I can see my data and export it.
For getting the pka from the changes in chemical shift I use euqation 15a from this paper: https://doi.org/10.1002%2Fmrm.1910360505
If there is a way to do this fit directly in CCPN, this would be great.
Best wishes
Johanna