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Carbohydrate Structures
D vs L isomer, aldose vs ketose, anomeric carbon, pyranose vs furanose, reducing vs nonreducing sugars
7
Biochemistry
Undergraduate 4
12/04/2015

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Cards

Term
How to determine the D vs L isomer
Definition
To determine the D vs L isomer, look at the stereocenter farthest away from the carbonyl group. The D isomer will have the -OH group on the right side[image]
Term
aldose
Definition

in the acyclic form, the aldose has the carbonyl group at the end of the molecule

[image]

 

In the cyclic form, aldoses have a hydrogen attached to the anomeric carbon

[image]

Term
ketose
Definition

the carbonyl group is moved from position 1 to position 2

acyclic form has another carbon only carbons attached to the carbonyl

[image]

the cyclic form - ketoses have a CH2 group attached to the anomeric carbon

[image]

Term
Anomeric carbon: alpha vs. beta
Definition

alpha - the -OH group is opposite the exocyclic methyl group 

beta - the -OH group is on the same side as the exocyclic methyl group[image]

Term
pyranose
Definition
cyclizes to form a 6 membrane ring
Term
furanose
Definition
cyclizes to form a 5 membered ring
Term
reducing sugars
Definition
sugars that react - must have a free -OH group at the anomeric carbon[image]
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