quaternary ammonium compound

Also found in: Dictionary, Thesaurus, Legal, Acronyms, Encyclopedia, Wikipedia.


1. made up of diverse elements or ingredients.
2. a substance made up of two or more materials.
3. in chemistry, a substance made up of two or more elements in union. The elements are united chemically, which means that each of the original elements loses its individual characteristics once it has combined with the other element(s). When elements combine they do so in definite proportions by weight; this is why the union of hydrogen and oxygen always produces water. Sugar, salt, and vinegar are examples of compounds.

Organic compounds are those containing carbon atoms; inorganic compounds are those that do not contain carbon atoms.
clathrate c's inclusion complexes in which molecules of one type are trapped within cavities of another substance, such as within a crystalline lattice structure or large molecule.
quaternary ammonium compound an organic compound containing a quaternary ammonium group, a nitrogen atom carrying a single positive charge bonded to four carbon atoms, e.g., choline.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

quaternary ammonium compound

Any of a group of compounds composed of a cation, in which a central nitrogen atom is joined to four organic groups, and any of various anions, used as antiseptics, solvents, and emulsifying agents.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Terminal disinfection in hospital using Quaternary ammonium compounds by use of a spray - fog technique.
Naturally occurring quaternary ammonium compounds including choline, glycine betaine and carnitine, found in many microbial environments, which have different biological functions.
Fate and effect of quaternary ammonium compounds on a mixed methanogenic culture.
Furthermore, the FRC24 integron contains the antiseptic (quaternary ammonium compounds) resistance gene qacH.
Chemical manufacturers take the leftover grapefruit pulp, a waste by-product from grapefruit juice production and, in an intensive, multi-step industrial chemical process, change the natural phenolic compounds into synthetic quaternary ammonium compounds. Typically, in chemical synthesis of this type, chemical reagents and catalysts are used under extreme high heat and pressure or vacuum.
Disinfectants were chosen that contained quaternary ammonium compounds, alcohol, or sodium hypochlorite.
Biocidal ingredients in these products often are quaternary ammonium compounds (such as BZK) and triclosan.
Previous studies have shown that both quaternary ammonium compounds and triclosan can activate effluxpumps in bacteria that transfer plasmids containing resistance genes.
Previous studies have shown that both quaternary ammonium compounds and triclosan can activate efflux pumps in bacteria that transfer plasmids containing resistance genes.
Cationic surfactants may be protonated long-chain amines and long-chain quaternary ammonium compounds. The class of amphoteric surfactants is represented by betaines and certain lecithins, while nonionic surfactants include polyethylene oxide, alcohols, and other polar groups.
Attached to the nanoparticles are molecules called quaternary ammonium compounds. Previous studies had shown that these molecules provide antimicrobial activity by disrupting bacterial membranes on contact.