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Stereochemistry of Amino Acids: Optical Properties
All amino acids (except glycine) rotate the plane of polarized light because of the presence of an asymmetric center at C-2. Both L and D enantiomers are possible for the amino acids. What do we mean by enantiomers? Do you recall reading about them in the last unit under the topic of isomerism? Like carbohydrates, amino acids too exist as L and D isomers. The definition of D and L depends on the position of -NH2 group on C-2. When the amino group is on the left of C2, it is called L form. Essentially, all the amino acids in the diet and in the body occur as the L isomer as shown in Figure
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