Esters tuaj yeem raug cais raws li cov kua qaub tshwj xeeb uas lawv tau muab los. Feem ntau yog carboxylic acid esters, tsim los ntawm cov tshuaj tiv thaiv ntawm carboxylic acid thiab ib qho cawv- piv txwv xws li ethyl acetate thiab methyl propionate. Ntxiv rau cov no, muaj cov inorganic acid esters-xws li sulfates thiab phosphates- uas pom cov ntawv thov tseem ceeb hauv kev lag luam thiab tshuaj lom neeg; Piv txwv xws li diethyl sulfate thiab triphenyl phosphate. Nyob ntawm seb hom kua qaub cuam tshuam, cov khoom, kev siv, thiab kev ruaj ntseg ntawm cov esters yuav txawv.
Esters kuj tuaj yeem raug cais raws li hom cawv siv hauv lawv qhov tsim. Yog tias tsim los ntawm cov dej cawv saturated, lawv feem ntau ua rau cov roj ntsha yooj yim esters, xws li triglycerides; conversely, yog tsim los ntawm unsaturated cawv, qhov tshwm sim yog unsaturated ester, xws li glyceryl oleate. Cawv nrog cov qauv tshwj xeeb-xws li cyclic alcohols lossis aromatic alcohols- kuj tuaj yeem ua rau cov kua qaub los tsim cov cyclic lossis aromatic esters; Cov hom esters no nquag siv hauv cov tshuaj tsw qab, flavoring, thiab kev lag luam tshuaj.
Raws li lawv cov qauv thiab daim ntawv thov, esters tuaj yeem muab faib ua cov esters yooj yim, cov esters nyuaj, thiab cov esters ua haujlwm. Tej yam yooj yim esters feem ntau yog tsim los ntawm cov tshuaj tiv thaiv ntawm ib tug monocarboxylic acid nrog ib tug monoalcohol thiab feem ntau ua hauj lwm raws li cov kuab tshuaj los yog fragrances. Complex esters-xws li triglycerides thiab phospholipids- yog ib qho tseem ceeb ntawm cov lipids ntuj. Kev ua haujlwm esters suav nrog cov uas muaj cov pab pawg ua haujlwm tshwj xeeb-xws li polyesters- thiab tau siv dav hauv kev lag luam yas thiab fiber ntau. Cov kev faib tawm ntau yam no pab txhawb kev nkag siab tob txog cov khoom thiab ntau yam kev siv ntawm esters.
