logo
AAT Bioquest

What is the isoelectric point of a zwitterion?

Posted July 2, 2021


Answer

The isoelectric point of a zwitterion is the pH at which its positive and negative charges balance or cancel each other out, resulting in a net charge of zero. Every zwitterion has its own specific isoelectric point, which is indicated as pI. At its isoelectric point, a zwitterion molecule as a whole is electrically neutral and will not migrate in an electric field. 

Additional resources

The molecular mass and isoelectric point of plant proteomes