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Medical Term:

dipolar ions


ions possessing both a negative charge and a positive charge, each localized at a different point in the molecule, which thus has both positive and negative “poles”; amino acids are the most notable dipolar ions, containing a positively charged NH3+ group and a negatively charged COO- group at neutral pH.

Synonym(s): amphions, zwitterions

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.