A betaine (BEET-uh-een, bē'tə-ēn', -ĭn) a cikin ilmin sunadarai shine kowane mahallin sinadari mai tsaka-tsaki tare da ingantaccen caja mai aiki na cationic kamar ammonium quaternary ko phosphonium cation (gaba ɗaya: ions onium) wanda bai ɗauka ba. hydrogen atom kuma tare da gungun ayyuka masu caji mara kyau kamar ƙungiyar carboxylate waɗanda ƙila ba za su kasance kusa da rukunin cationic ba. Don haka betaine na iya zama takamaiman nau'in zwitterion. A tarihi an kebe kalmar don trimethylglycine kawai. Ana amfani da shi azaman magani kuma.A cikin tsarin ilimin halitta, yawancin betaines da ke faruwa ta halitta suna aiki azaman osmolytes na halitta, abubuwan da aka haɗa ko ɗauka daga muhalli ta sel don kariya daga damuwa osmotic, fari, babban salinity ko zafin jiki. Tarin cikin salula na betaines, wanda ba shi da lahani ga aikin enzyme, tsarin furotin da amincin membrane, yana ba da izinin riƙe ruwa a cikin sel, don haka yana kare daga tasirin bushewa. Hakanan mai ba da gudummawar methyl ne na ƙara fahimtar mahimmanci a cikin biology.Betaine shine alkaloid tare da hygroscopicity mai ƙarfi, don haka galibi ana bi da shi tare da wakili na anti-caking a cikin tsarin samarwa. Tsarinsa na kwayoyin halitta da tasirin aikace-aikacensa ba su da bambanci sosai da na betaine na halitta, kuma yana cikin sinadari na halitta daidai da haɗin sinadarai.Betaine shine mai ba da gudummawar methyl mai matukar tasiri wanda zai iya maye gurbin methionine da choline. Sauya methionine don inganta aikin samarwa da rage farashin ciyarwa.
