Qhov sib txawv tseem ceeb ntawm alpha thiab beta anomers yog tias hauv alpha anomer pawg hydroxyl ntawm cov pa roj carbon monoxide yog cis rau exocyclic oxygen ntawm qhov chaw anomeric, whereas hauv beta anomer pawg hydroxyl yog trans mus rau exocyclic oxygen.
Ib anomer yog geometric variation ntawm carbohydrates. Nws yog hom epimer uas peb tuaj yeem pom cov pa roj carbon atom. Ib qho anomeric carbon atom yog muab los ntawm carbonyl carbon ntawm qhib-chain qauv ntawm cov carbohydrate. Yog li ntawd, kev tsim ntawm cov qauv cyclic los ntawm cov qauv qhib qhib hu ua anomerization.
Alpha Anomers yog dab tsi?
Alpha anomer yog kev teeb tsa ntawm cov carbohydrate uas pawg hydroxyl yog cis rau exocyclic oxygen ntawm qhov chaw anomeric. Qhov ntawd txhais tau tias, pawg hydroxyl thiab cov exocyclic oxygen atom nyob rau tib sab ntawm molecular projection. Thaum peb kos ib lub mis Haworth, pawg hydroxyl yog nyob rau hauv downward yog hais tias nws yog alpha anomer. Cov piv txwv hauv qab no qhia txog alpha anomer ntawm D-glucopyranose.
Daim duab 01: Cov pab pawg hydroxyl nyob rau hauv nqes mus yog pom hauv cov xim ntsuab hauv daim duab saum toj no. Kev taw qhia downward zoo li alpha anomer.
Vim tias anomers txawv hauv cov qauv tshuaj, lawv txawv hauv lawv cov khoom thiab. Cov anomers yog diastereomers ntawm ib leeg.
Dab tsi yog Beta Anomers?
Beta anomer yog qhov teeb tsa ntawm cov carbohydrate uas cov pab pawg hydroxyl hloov mus rau exocyclic oxygen ntawm qhov chaw anomeric. Qhov ntawd txhais tau hais tias, pawg hydroxyl thiab cov exocyclic oxygen atom nyob rau sab nraud ntawm molecular projection.
Daim duab 02: Cov pab pawg hydroxyl nyob rau sab saud yog pom xim liab hauv daim duab saum toj no. Kev taw qhia nce siab zoo li alpha anomer.
Thaum peb kos cov qauv Haworth, pawg hydroxyl nyob rau hauv kev nce siab yog tias nws yog beta anomer. Cov piv txwv saum toj no qhia txog beta anomer ntawm D-glucopyranose.
Qhov txawv ntawm Alpha thiab Beta Anomers yog dab tsi?
Qhov sib txawv tseem ceeb ntawm alpha thiab beta anomers yog nyob rau hauv alpha anomer, pawg hydroxyl ntawm cov pa roj carbon monoxide yog cis rau exocyclic oxygen ntawm lub chaw anomeric, whereas hauv beta anomer, pawg hydroxyl yog trans mus rau exocyclic. oxygen. Hauv Haworth qhov projection ntawm cov piam thaj molecule, peb tuaj yeem pom cov pab pawg hydroxyl ntawm cov atomeric carbon atom hauv nqes mus yog tias nws yog alpha anomer. Tab sis, nyob rau hauv beta anomer, pawg hydroxyl ntawm cov atomeric carbon atom yog nyob rau hauv upward kev taw qhia. Piv txwv li, alpha D-glucopyranose yog alpha anomer ntawm glucopyranose, thaum beta D-glucopyranose yog beta anomer ntawm glucopyranose molecule.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm alpha thiab beta anomers.
Summary – Alpha vs Beta Anomers
Ib anomer yog geometric variation ntawm carbohydrates. Qhov sib txawv tseem ceeb ntawm alpha thiab beta anomers yog nyob rau hauv alpha anomer, pawg hydroxyl ntawm cov pa roj carbon monoxide yog cis rau exocyclic oxygen ntawm qhov chaw anomeric, whereas hauv beta anomer, pawg hydroxyl yog trans mus rau exocyclic oxygen. Hauv Haworth qhov projection ntawm cov piam thaj molecule, peb tuaj yeem pom cov pab pawg hydroxyl ntawm cov atomeric carbon atom hauv nqes mus yog tias nws yog alpha anomer. Tab sis, nyob rau hauv cov beta anomer, pawg hydroxyl ntawm cov anomeric carbon atom nyob rau hauv lub upward direction.
