L-alanine has the structure [tex]NH_{3} CH(CH_{3}) COOH[/tex], so Amine ([tex]NH_{2}[/tex]) and Carboxylic Acid ([tex]COOH[/tex]) functional groups are common in all amino acids.
Amines are formally derivatives of ammonia ([tex]NH_{3}[/tex]), where one or more hydrogen atoms are replaced by the substituent, such as an aryl or alkyl group.
Carboxylic acids are any of a class of organic compounds where a carbon (C) atom forms bond to an oxygen (O) atom by the double bond and to the hydroxyl group (OH) by a single bond. The fourth bond link with the carbon atom to a hydrogen (H) atom. Therefore, the amine group and carboxylic acid group are common in all amino acids.
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