Question
Write the classification of amino acids, giving examples.
✓
Answer
The amino acids are of three types : acidic, basic and neutral. The symbol ' $R$ ' in the structure of aamino acids represents side chain and may contain additional functional groups.
(1) Acidic amino acids : If ' $R$ ' contains a carboxyl $(- COOH )$ group the amino acid is acidic amino acid, i.e. If carboxyl groups are more in number than amino groups, then amino acids are acidic in nature.
Examples : Glutamic acid $HOOC - CH _2- CH _2-$ : Aspartic acid $HOO - CH _2-$
(2) Basic amino acids : If ' $R^{\prime}$ contains an amino $\left(1^{\circ}, 2^{\circ}\right.$, or $\left.3^{\circ}\right)$ group, it is called basic amino acid i.e. If amino groups are more in number than carboxyl groups then amino acids are basic in nature.
(3) Neutral amino acids : The other amino acids having neutral or no functional group in 'R' are called neutral amino acids, i.e. The amino acids having equal number of amino and carboxyl groups are neutral amino acids.
Examples : Alanine $CH _3$-; Valine $\left( CH _3\right)_2- CH$
(1) Acidic amino acids : If ' $R$ ' contains a carboxyl $(- COOH )$ group the amino acid is acidic amino acid, i.e. If carboxyl groups are more in number than amino groups, then amino acids are acidic in nature.
Examples : Glutamic acid $HOOC - CH _2- CH _2-$ : Aspartic acid $HOO - CH _2-$
(2) Basic amino acids : If ' $R^{\prime}$ contains an amino $\left(1^{\circ}, 2^{\circ}\right.$, or $\left.3^{\circ}\right)$ group, it is called basic amino acid i.e. If amino groups are more in number than carboxyl groups then amino acids are basic in nature.
(3) Neutral amino acids : The other amino acids having neutral or no functional group in 'R' are called neutral amino acids, i.e. The amino acids having equal number of amino and carboxyl groups are neutral amino acids.
Examples : Alanine $CH _3$-; Valine $\left( CH _3\right)_2- CH$
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