*IMPORTANT NOTE: The most common ketoses have the ket function at carbon 2. 5. Circle the carbonyl group in the structures below and specif structures correspond to an aldose or ketoses. CH₂OH C=O CH₂OH Н_ C H-C-OH CH₂OH
Carbohydrates
Carbohydrates are the organic compounds that are obtained in foods and living matters in the shape of sugars, cellulose, and starch. The general formula of carbohydrates is Cn(H2O)2. The ratio of H and O present in carbohydrates is identical to water.
Starch
Starch is a polysaccharide carbohydrate that belongs to the category of polysaccharide carbohydrates.
Mutarotation
The rotation of a particular structure of the chiral compound because of the epimerization is called mutarotation. It is the repercussion of the ring chain tautomerism. In terms of glucose, this can be defined as the modification in the equilibrium of the α- and β- glucose anomers upon its dissolution in the solvent water. This process is usually seen in the chemistry of carbohydrates.
L Sugar
A chemical compound that is represented with a molecular formula C6H12O6 is called L-(-) sugar. At the carbon’s 5th position, the hydroxyl group is placed to the compound’s left and therefore the sugar is represented as L(-)-sugar. It is capable of rotating the polarized light’s plane in the direction anticlockwise. L isomers are one of the 2 isomers formed by the configurational stereochemistry of the carbohydrates.
![*IMPORTANT NOTE: The most common ketoses have the ketone
function at carbon 2.
5. Circle the carbonyl group in the structures below and specify if the
structures correspond to an aldose or ketoses.
O
CH₂OH
C=O
CH₂OH
H
C
H-C-OH
CH₂OH
6. The sugar below is glucose. Number the carbons starting with the
carbonyl group. Determine how many carbons are chiral centers
(circle the chiral centers and list them in the space below).
H-C-OH
HO-C-H
H-C-OH
H-C-OH
CH₂OH
D-Glucose,
an aldohexose
H-C-OH
C-0
HO-C-H
H-C-OH
H-C-OH
CH₂OH
D-Fructose,
a ketohexose
Chiral centers:
7. Based on your answer above, calculate the number of possible
stereosiomers that glucose has. Remember, the equation to do that is
2" where n is the number of chiral centers and two is the number of
configurations (E.g. D and L are two configurations).
CHO
H-C-OH
Achiral centers:
8. The molecules below (fisher projections) correspond to
glyceraldehyde. Glyceraldehyde has two configurations D and L. The
configuration is determined based on the position of the -OH group.
D configuration for dextro (right) and L for levo (left). Determine the
configuration of each of the two molecules below.
CHO
но-с-
CH₂OH
D-Glyceraldehyde
H
CH₂OH
L-Glyceraldehyde
Fischer projection formulas](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff27c3bcc-31ef-40b0-b008-4b23339d198c%2F47863815-9615-4f3f-9255-769aa430836f%2Fswqpmf4_processed.jpeg&w=3840&q=75)
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