4-Amino-1-naphthalenesulfonic acid sodium salt hydrate can be used:
- To prepare 1-bromo-4-naphthalenesulfonic acid, applicable as a phosphorophore in the detection of peptides by capillary electrophoresis.
- As a reactant to synthesize scandium complexes, applicable as artificial receptors in the removal of amphoteric α−amino acids from aqueous solutions.