Qhov sib txawv tseem ceeb ntawm glyceraldehyde thiab dihydroxyacetone yog glyceraldehyde yog aldehyde, whereas dihydroxyacetone yog ketone.
Ob leeg glyceraldehyde thiab dihydroxyacetone yog cov carbohydrates yooj yim. Ob lub tebchaw no muaj tib cov tshuaj formula C3H6O3 Tab sis, lawv cov qauv thiab pawg ua haujlwm. sib txawv ntawm ib leeg. Yog li ntawd, muaj qhov sib txawv ntawm glyceraldehyde thiab dihydroxyacetone nyob rau hauv cov nqe lus ntawm reactivity ib yam nkaus.
YGlyceraldehyde yog dab tsi?
Glyceraldehyde yog ib qho yooj yim aldehyde uas yog cov carbohydrates. Nws yog triose monosaccharide. Qhov ntawd txhais tau tias; Nws muaj peb cov pa roj carbon atoms (triose), thiab nws yog ib chav tsev ntawm cov suab thaj (monosaccharide). Nws cov tshuaj formula yog C3H6O3 Nws yog aldose thiab qhov yooj yim tshaj ntawm aldoses. Ib qho aldose yog monosaccharide muaj ib pawg aldehyde ntawm qhov kawg ntawm cov saw hlau. Vim nws yog monosaccharide, glyceraldehyde yog qab zib.
Ntxiv mus, nws yog xim tsis muaj xim thiab crystalline khoom. Peb tuaj yeem pom nws ua qhov sib xyaw nruab nrab hauv carbohydrate metabolism. Lub npe glyceraldehyde los ntawm kev sib xyaw ntawm ob lo lus: glycerol + aldehyde. Cov molar mass ntawm no compound yog 90.07 g / mol. Ntxiv mus, nws cov ntsiab lus melting thiab lub boiling point yog 145 ° C thiab 150 ° C, raws li.
Daim duab 01: Glyceraldehyde
Muaj ob lub stereoisomers ntawm glyceraldehyde vim nws muaj chiral carbon atom. Ob tug qauv yog lub npe hu ua enantiomers. Hauv chav kuaj, peb tuaj yeem npaj cov khoom sib xyaw no los ntawm cov oxidation me me ntawm glycerol. Nws yuav muab ob qho tib si glyceraldehyde thiab dihydroxyacetone. Rau qhov oxidation no, peb tuaj yeem siv hydrogen peroxide thiab cov catalyst xws li ferrous ntsev.
YDihydroxyacetone yog dab tsi?
Dihydroxyacetone yog ib qho yooj yim ketone uas yog cov carbohydrates. Lub ntsiab lus ntawm cov tshuaj no yog glycerone. Nws yog triose, txhais tau tias nws muaj peb carbon atoms. Cov tshuaj formula yog C3H6O3 thaum molar mass yog 90.07 g / mol. Nws cov ntsiab lus melting tuaj yeem nyob ntawm 89 txog 91 ° C. Tsis tas li ntawd, qhov sib xyaw no yog hygroscopic thiab zoo li cov hmoov dawb crystalline hmoov. Dihydroxyacetone muaj qab zib, txias saj. Nws kuj muaj tus yam ntxwv tsw. Tsis zoo li glyceraldehyde, qhov sib xyaw no tsis muaj chiral centre, yog li tsis muaj enantiomers. Qhov no txhais tau tias nws yog optically-inactive. Feem ntau, qhov sib xyaw no muaj nyob hauv daim ntawv dimer.
Daim duab 02: Dihydroxyacetone
Tsis tas li ntawd, nws cov monomer yog cov dej-soluble heev; Nws kuj yog soluble hauv ethanol thiab acetone. Txoj kev npaj yog tib yam li glyceraldehyde vim tias qhov me me oxidation ntawm glycerol muab ob qho tib si glyceraldehyde thiab dihydroxyacetone. Txawm li cas los xij, muaj lwm txoj hauv kev los npaj cov tshuaj no siv glycerol thiab cationic-palladium raws li catalysts nyob rau hauv lub xub ntiag ntawm oxygen ntawm chav tsev kub. Thiab, txoj kev no muab dihydroxyacetone xaiv ntau dua, nrog cov txiaj ntsig siab.
Dab tsi yog qhov zoo sib xws ntawm Glyceraldehyde thiab Dihydroxyacetone?
- Glyceraldehyde thiab dihydroxyacetone yog cov carbohydrates yooj yim.
- Ob lub tebchaw no muaj tib cov tshuaj formula C3H6O3.
Qhov txawv ntawm Glyceraldehyde thiab Dihydroxyacetone yog dab tsi?
Qhov sib txawv tseem ceeb ntawm glyceraldehyde thiab dihydroxyacetone yog glyceraldehyde yog aldehyde, whereas dihydroxyacetone yog ketone. Thaum xav txog cov qauv ntawm cov tebchaw no, glyceraldehyde muaj peb cov pa roj carbon atoms raws li cov saw, ob pawg -OH thiab ob-bonded oxygen atom ntawm qhov kawg ntawm carbon saw; Nyob rau hauv sib piv, dihydroxyacetone muaj peb carbon atoms raws li ib tug saw, ob -OH pawg thiab ob-bonded oxygen atom nyob rau hauv nruab nrab ntawm cov carbon saw.
Ntxiv mus, glyceraldehyde yog ib qho chiral compound, thiab nws muaj ob enantiomers, thaum dihydroxyacetone tsis qhia chirality. Yog li, glyceraldehyde yog optically active, whereas dihydroxyacetone yog optically inactive. Tsis tas li ntawd, hauv chav kuaj, peb tuaj yeem npaj glyceraldehyde los ntawm me ntsis oxidation ntawm glycerol nyob rau hauv lub xub ntiag ntawm hydrogen peroxide thiab ib tug catalyst xws li ferrous ntsev. Peb tuaj yeem npaj dihydroxyacetone siv glycerol thiab cationic-palladium raws li catalysts nyob rau hauv lub xub ntiag ntawm oxygen nyob rau hauv chav tsev kub. Ntxiv rau cov no, glyceraldehyde tsis yog-hygroscopic whereas dihydroxyacetone hygroscopic.
Cov duab hauv qab no qhia txog qhov sib txawv ntawm glyceraldehyde thiab dihydroxyacetone.
Summary – Glyceraldehyde vs Dihydroxyacetone
Hauv cov ntsiab lus, ob qho tib si glyceraldehyde thiab dihydroxyacetone yog cov carbohydrates yooj yim. Txawm li cas los xij, qhov sib txawv tseem ceeb ntawm glyceraldehyde thiab dihydroxyacetone yog glyceraldehyde yog aldehyde, whereas dihydroxyacetone yog ketone.
