Betaine (BEET-uh-een, bē'tə-ēn ', -ĭn) muri chimie ni imiti iyo ari yo yose idafite aho ibogamiye hamwe n’itsinda rikora neza nka amonium ya quaternary cyangwa fosifoni (muri rusange: ion onium) idafite oya hydrogène atom hamwe nitsinda rikora nabi nka groupe ya carboxylate idashobora kuba yegeranye na cationic site. Betaine rero irashobora kuba ubwoko bwihariye bwa zwitterion. Amateka ijambo ryagenewe trimethylglycine gusa. Ikoreshwa nk'umuti. Muri sisitemu y'ibinyabuzima, betaine nyinshi zisanzwe zibaho nka osmolyte kama, ibintu bihinduranya cyangwa bikavanwa mubidukikije na selile kugirango birinde impungenge za osmotic, amapfa, umunyu mwinshi cyangwa ubushyuhe bwinshi. Kwiyegeranya kwa betaine, kutabangamira imikorere ya enzyme, imiterere ya poroteyine hamwe nuburinganire bwa membrane, bituma amazi agumana ingirabuzimafatizo, bityo bikarinda ingaruka ziterwa no kubura umwuma. Numuterankunga wa methyl ufite akamaro kanini muri biologiya.Betaine ni alkaloide ifite hygroscopique ikomeye, bityo ikunze kuvurwa hamwe na anti-cake mugikorwa cyo kuyibyaza umusaruro. Imiterere ya molekulari n'ingaruka zayo ntabwo bitandukanye cyane na betaine karemano, kandi ni mubintu bisanzwe bihwanye na synthesis ya chimique.Betaine numuterankunga wa methyl ukora cyane ushobora gusimbuza methionine na choline. Simbuza methionine kunoza imikorere yumusaruro no kugabanya ikiguzi cyibiryo.
