1. Quaternary ammonium salts ke metsoako e entsoeng ka ho nkela liathomo tse 'nè tsa hydrogen ho li-ion tsa ammonium ka lihlopha tsa alkyl.

Ke cationic surfactant e nang le thepa e ntle ea bactericidal, 'me karolo e sebetsang ea mosebetsi oa bona oa bactericidal ke sehlopha sa cationic se entsoeng ka motsoako oa metso ea tlhaho le liathomo tsa nitrogen.
2. Ho tloha ka 1935, ha Majeremane a sibolla phello ea baktheria ea alkyl dimethyl ammonium gasification, a ile a e sebelisa ho phekola junifomo ea sesole ho thibela tšoaetso ea maqeba. Lipatlisiso mabapi le lisebelisoa tsa antibacteria tsa letsoai la quaternary ammonium esale e le sepheo sa bafuputsi. Lisebelisoa tse thibelang likokoana-hloko tse lokiselitsoeng ka letsoai la quaternary ammonium li na le thepa e ntle ea ho thibela likokoana-hloko 'me li ka sebelisoa haholo mafapheng a mangata a kang meriana, phekolo ea metsi le lijo.
3. Mesebetsi ea letsoai la quaternary ammonium e kenyelletsa:

Likokoana-hloko tsa temo, meriana e bolaeang likokoana-hloko sebakeng sa sechaba, meriana e potolohang ea metsi, likokoana-hloko tsa metsing, likokoana-hloko tsa bongaka, likokoana-hloko tsa liphoofolo le likhoho, likokoana-hloko tsa red tide, likokoana-hloko tsa blue-green algae, le masimo a mang a thibelang likokoana-hloko le a bolaeang likokoana-hloko. Haholo-holo letsoai la Gemini quaternary ammonium le na le litlamorao tse ntle tsa bactericidal le litšenyehelo tse tlase ka kakaretso.

Tetrabutylammonium bromide(TBAB), e tsejoang hape e le tetrabutylammonium bromide.

Ke letsoai la tlhaho le nang le foromo ea molek'hule C ₁₆ H₃₆BrN.

Sehlahisoa se hloekileng ke kristale e tšoeu kapa phofo, e nang le deliquescence le monko o khethehileng. E tsitsitse mocheso oa kamore le khatello ea sepakapaka. E qhibiliha ka metsing, joala, le acetone, e qhibiliha hanyenyane ka benzene.

Commonly e sebelisoa e le setsi sa mahareng ho organic synthesis, phase transfer catalyst, le ion pair reagent.