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 (zwĭt′ər-ī′ən, swĭt′-, tsvĭt′-)
A molecule, especially an amino acid, containing a positively charged ion at one end and a negatively charged ion at the other.

[German : Zwitter, hybrid (from Middle High German zwitarn, from Old High German, from zwi-, twice; see dwo- in Indo-European roots) + Ion, ion (from Greek; see ion).]

zwit′ter·i·on′ic (-ī-ŏn′ĭk) adj.


(Chemistry) chem an ion that carries both a positive and a negative charge
[C20: from German Zwitter hermaphrodite + ion]
zwitterionic adj


(ˈzwɪt ərˌaɪ ən, ˈswɪt-, ˈtsvɪt-)

an ion with both a positive and a negative charge.
[< German Zwitterion (1897) =Zwitter hybrid, hermaphrodite + Ion ion]
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References in periodicals archive ?
Physiologically based pharmacokinetic modelling 2: Predicting the tissue distribution of acids, very weak bases, neutrals and zwitterions.
This diol was then reacted with diisocyanates to prepare polyurethane resins, which in turn were reacted with 1,3-propane sultone to obtain the zwitterionic polyurethanes containing sulfobetaine zwitterions side groups.
2]-amine reaction, various ionic species are formed such as carbamates, protonated amines and zwitterions.
Zwitterions are chemical compounds that have a total net electrical charge of zero but contain positively and negatively charged groups.
and ITIS Montani) has concentrated her attention on ion-pair chromatography, encompassing such aspects as retention modeling, zwitterions and other unusual analytes, and applications to non-separative functions.
Usually, tetracycline occurs predominantly as zwitterions at the typical pH values of the natural environment (Sassman and Lee 2005).
5, the zwitterions form of RDB in water may increase the aggregation of RDB to form a bigger molecular form (dimer) and become unable to enter into the pore structure of the adsorbent surface.