Aspartic acid (abbreviated as Asp or D; encoded by the codons [GAU and GAC]), also known as aspartate, is an α-amino acid that is used in the biosynthesis of proteins. Similar to all other amino acids it contains an amino group and a carboxylic acid. Its α-amino group is in the protonated –NH+.
3 form under physiological conditions, while its α-carboxylic acid group is deprotonated −COO− under physiological conditions.
Aspartic acid has an acidic side chain (CH2COOH) which reacts with other amino acids, enzymes and proteins in the body.

Function:
1. Aspartic acid is widely used on medicine, food and chemical industry.
2. Aspartic acid can be used on the treatment of heart disease, liver disease and hypertension.It has the function of preventing and recorving fatigue. It can be made of amino acid infusion to do as ammonia antidote, liver function promoter and fatigue recovery agent.
3. Aspartic acid can be used on tech industry. It is a good nutrition supplements that can be added in soft drinks. It is also the raw material of radix asparagi acyl methyl phenylalanine which is we know as Aspartame.
4. Aaspartic acid can be used on chemical industry. It is the raw material of synthetic resin.
5. Aaspartic acid can also be used as nutritive additive on cosmetics.