(redirected from zwitterionic)
Also found in: Medical, Encyclopedia.


 (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]
Mentioned in ?
References in periodicals archive ?
The set was composed to cover a wide range of detergents proposed earlier for solubilization of membrane-bound proteins and it included various non-ionic, ionic, as well as zwitterionic compounds.
Linear and branched zwitterionic derivatives of polyethyleneimine as carriers for pharmacologically active components, Macromolecules Chemistry, Pharmacologically active polymers, 184, 793 (1983).
The composition excludes anionic, amphoteric and zwitterionic surfactants.
g] differences were observed when terminal groups of some end-functionalized block copolymers of styrene and isoprene were substituted by zwitterionic groups (16).
Evaluation of nonionic and zwitterionic detergents as membrane protein solubilizers in two-dimensional electrophoresis.
Cationic, anionic, and zwitterionic surfactants are charged species and obviously can only be used in formulations where the charge can be tolerated.
Zwitterionic rhodium complexes were shown to be excellent catalysts for the hydroformylation of a wide range of olefins including polybutadiene to the corresponding aldehydes.
When dissolved in water, the solution is mainly composed of the zwitterionic species, together with a smaller amount of the cationic and anionic species.
A peak around 2800cm-1 is assigned to the zwitterionic linkage produced by hydrogen bond formation in HC=N- group.
The composition is comprised of a chelant selected from the group consisting of glutamic acid, diethylenetriamine penta methylphosphonic acid; diethylenetriamine pentaacetic acid, methyl glycinediacetic acid and mixtures thereof; a surfactant selected from the group consisting of anionic, nonionic, cationic, amphoteric, zwitterionic, semi-polar nonionic surfactants and mixtures thereof; a branched nonionic surfactant; and aqueous liquid carrier.