Q. 26

What is essential

Answer :

α-glucose and β-glucose are two cyclic hemiacetal forms of glucose which differ only in the configuration of hydroxyl groups at anomeric carbon. These isomers are called anomers.


The only difference between the structures of α-glucose and β-glucose is the way the H, C, O atoms are attached to each other.. In α-glucose, –OH is pointing down wards and –H pointing upwards while in β-glucose, –H is pointing down wards and –OH pointing upwards.


Also, α-glucose is the monomer unit of starch whereas β-glucose is the monomer unit of cellulose. We human beings can only digest α-glucose and not β-glucose.



α-glucose



β-glucose


The name pyranose comes from pyran, a chemical structure that includes a six-membered ring consisting of five carbon atoms and one oxygen atom and containing two double bonds.



Structure of pyran.


The pyranose structure of glucose includes a six membered ring with 5-carbon atoms and one oxygen atom having no double bonds.



Pyranose structure of glucose.


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