The displacement chromatography of Partridge and Brimley has been applied to study the free amino acids present in two species of marine algae.
1) Aspartic acid, glutamic acid, serine, threonine, glycine, alanine, valine, leucine, proline, asparagine, taurine, rhodoic acid and unknown B have been proved to occur in Rhodomela larix.
2) Chondrine, aspartic acid, glutamic acid, threonine, serine, glycine, alanine, valine, leucine, citrulline, ornithine, taurine, unknown C and D have been also confirmed in Chondrus ocellatus.
3) Chondrine, citrulline and unknown D have been isolated in crystalline state from Chondrus ocellatus.