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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 ?
Stadler, Supramolecular interaction controlled diffusion mechanism and improved mechanical behavior of hybrid hydrogel systems of zwitterions and CNT, Macromolecules, 45, 9804 (2012).
Depending on soil characteristics, OTC molecules can be presented as cations, anions or zwitterions, making it difficult to predict their characteristics in terms of adsorption, bioavailability and potential toxicity [15].
Verma et al., "Amino acid based imidazolium zwitterions as novel and green corrosion inhibitors for mild steel: Experimental, DFT and MD studies," Journal of Molecular Liquids, vol.
In addition, DC exists in various forms in aqueous solution and its predominant specious forms are different, showing as cations, zwitterions, and anions under acid, neutral, and alkaline conditions, respectively.
Physiologically based pharmacokinetic modelling 2: Predicting the tissue distribution of acids, very weak bases, neutrals and zwitterions. JPharm Sci 95, 1238-1257.
Further buttressing this point of view is the fact that amino acids exist as zwitterions in crystalline form, with a positively charged ammonium ion with a weak v(N-H) band.
Ouyang, "Highly conductive PEDOT: PSS films prepared through a treatment with zwitterions and their application in polymer photovoltaic cells," Journal of Materials Chemistry, vol.
At the B3LYP/6-311++g(3d,3p) level, zwitterions were higher by 7.2 and 10.7 kcal/mol (Table 4).
FQs are the group of chemical compounds called zwitterions. Zwitterion is a neutral molecule with both positive and negative electrical charges on its opposite sides.
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.
Upon C[O.sub.2]-amine reaction, various ionic species are formed such as carbamates, protonated amines and zwitterions. Increasing ionic strength of the membrane results in the reduction of both C[O.sub.2] solubility and diffusivity of C[O.sub.2]-amine complexes in the membrane (salting-out effect).
Keefer, "New nitric oxide-releasing zwitterions derived from polyamines," Journal of Organic Chemistry, vol.