- #1
hannoit
- 1
- 0
Hello,
I have a (simple) question concerning proton binding behaviour. Maybe someone can help me to understand the topic.
Let us regard one type of molecule in solution with only one binding site and let f(pH) describe the percentage of protonated molecules of all molecules.
Then for low pH
f=1 (1)
and for high pH
f=0. (2)
According to Onufriev et al. "A novel view of pH Titration ..." (2001) the average protonation in equilibrium is described by f(x)=a*x/(a*x+1).
At first sight this seems to fullfil (1) and (2). But actually in this paper the variable x is not the pH-Value but the proton activity.
Am I right that a ligand activity is in [0,1]?
But if so, then I don't understand how this equation gives a titration curve?
Thanks a lot and kind regards,
Hannoit
I have a (simple) question concerning proton binding behaviour. Maybe someone can help me to understand the topic.
Let us regard one type of molecule in solution with only one binding site and let f(pH) describe the percentage of protonated molecules of all molecules.
Then for low pH
f=1 (1)
and for high pH
f=0. (2)
According to Onufriev et al. "A novel view of pH Titration ..." (2001) the average protonation in equilibrium is described by f(x)=a*x/(a*x+1).
At first sight this seems to fullfil (1) and (2). But actually in this paper the variable x is not the pH-Value but the proton activity.
Am I right that a ligand activity is in [0,1]?
But if so, then I don't understand how this equation gives a titration curve?
Thanks a lot and kind regards,
Hannoit