Betaine (BEET-uh-een, bē'tə-ēn', -ĭn) mu chemistry ndi mankhwala aliwonse osalowerera ndale omwe ali ndi gulu lodziwika bwino la cationic monga quaternary ammonium kapena phosphonium cation (kawirikawiri: ma ion ion) omwe alibe atomu ya haidrojeni komanso gulu logwira ntchito molakwika monga gulu la carboxylate lomwe silingakhale loyandikana ndi malo a cationic. Betaine motero ikhoza kukhala mtundu wina wa zwitterion. M'mbiri mawuwa ankasungidwa kwa trimethylglycine kokha. Amagwiritsidwa ntchito ngati mankhwala komanso.Muzinthu zachilengedwe, ma betaine ambiri omwe amapezeka mwachilengedwe amakhala ngati organic osmolytes, zinthu zopangidwa kapena kutengedwa kuchokera ku chilengedwe ndi maselo kuti atetezedwe ku nkhawa ya osmotic, chilala, mchere wambiri kapena kutentha kwambiri. Kuphatikizika kwa intracellular kwa betaines, kosasokoneza ntchito ya enzyme, kapangidwe ka mapuloteni ndi umphumphu wa membrane, kumapangitsa kuti madzi asungidwe m'maselo, motero amateteza ku zotsatira za kuchepa kwa madzi m'thupi. Ndiwoperekanso methyl wodziwika bwino kwambiri mu biology.Betaine ndi alkaloid yokhala ndi hygroscopicity yolimba, choncho nthawi zambiri imathandizidwa ndi anti-caking agent popanga. Mapangidwe ake a maselo ndi zotsatira zake sizosiyana kwambiri ndi za betaine zachilengedwe, ndipo zimakhala zachirengedwe chofanana ndi mankhwala synthesis.Betaine ndi wothandizira kwambiri wa methyl omwe angalowe m'malo mwa methionine ndi choline. M'malo mwa methionine kuti muwonjezere magwiridwe antchito ndikuchepetsa mtengo wa chakudya.
