Neutral (Side Chain)

Since an amino acid has both an amine and acid group which have been neutralized in the zwitterion, the amino acid is neutral unless there is an extra acid or base on the side chain. If neither is present then then the whole amino acid is neutral.

Amino acids with an amide on the side chain do not produce basic solutions i.e. asparagine and glutamine. You need to look at the functional groups carefully because an amide starts out looking like an amine, but has the carbon double bond oxygen which changes the property. Amides are not basic.

Even though tryptophan has an amine group as part of a five member ring, the electron withdrawing effects of the two ring systems do not allow nitrogen to act as a base by attracting hydrogen ions.

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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