Daim ntawv cog lus tsim los ntawm ob qho tib si organic molecules yog hu ua kev sib txuas ester. Ib qho yooj yim fatty acid monomer ntawm ib lipid muaj ib tug txawm tus naj npawb ntawm hydrocarbon chains koom nrog ib daim ntawv cog lus. … Qhov sib txuas ester yog tsim los ntawm cov pa oxygen molecules ntawm glycerol thiab hydroxyl molecules ntawm fatty acids.
ester linkage siv rau dab tsi?
Ester linkages yog tseem ceeb ntawm cov molecules hu ua lipids. Nyob rau hauv peb lub cev, lipids tsim lipid bilayers, uas tsim cov cell membranes thiab lwm yam organelles nyob rau hauv lub cell. Lawv muaj peev xwm ua tau li no vim lawv muaj peev xwm ua tau ob qho tib si hydrophilic thiab hydrophobic.
Qhov twg yog lub ntsiab lus zoo tshaj plaws ntawm kev sib txuas ester?
ester linkages. khi ntawm glycerol / fatty acids los tsim lipids.
Koj paub qhov kev sib txuas ester li cas?
Esters feem ntau raug txheeb xyuas los ntawm gas chromatography , noj kom zoo dua ntawm lawv qhov kev hloov pauv. IR (infrared) spectra rau esters muaj qhov khaus, ntse band nyob rau hauv thaj tsam 1730–1750 cm−1 muab rau νC=O, lossis kev co ntawm C=O. daim ntawv cog lus. Qhov siab kawg no hloov pauv nyob ntawm cov pab pawg ua haujlwm txuas nrog carbonyl.
Yuav ua li cas koj tawg qhov ester txuas?
Hydrolysis yog hom tshuaj tiv thaiv uas cov dej molecule tawg ib daim ntawv cog lus. Nyob rau hauv cov ntaub ntawv ntawm ib tug ester hydrolysis, lub nucleophile - dej los yog ib tug hydroxide ion - tawm tsam cov carbonyl carbon ntawm cov ester pawg kom tawg ester daim ntawv cog lus.
