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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 ?
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).