Acidic (Polar)

If the side chain contains an acid functional group, the whole amino acid produces an acidic solution. Normally, an amino acid produces a nearly neutral solution since the acid group and the basic amine group on the root amino acid neutralize each other in the zwitterion. If the amino acid structure contains two acid groups and one amine group, there is a net acid producing effect. The two acidic amino acids are aspartic and glutamic.

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Structure of Amino Acids
Amino Acid Properties

Classes of Amino Acids
Amino Acid Disorders Screening
Functions and Non-functions in proteins