SPIES, J R Spectrophotometric analysis of amino acids and peptides with their copper salts. [electronic resource] - The Journal of biological chemistry Aug 1951 - 787-97 p. digital Publication Type: Journal Article ISSN: 0021-9258 Subjects--Topical Terms: Amino AcidsAnionsCopperOrganic ChemicalsPeptidesSaltsSpectrophotometry