I'm not following your terminology a little bit ...
I'm guessing you want to neutralize DCA, and form it's sodium salt.
You also want a buffer. That's fine, just neutralize it to within +/- one pH unit of it's pKa, whatever the references say it is and you'll have a buffer. If you need another pH, then it will make a poor buffer.
But, I'd use NaOH, so I wouldn't get fizzing reagents.
Or maybe you have left out some nuance of your application?