G PHYSICS
G01 MEASURING; TESTING
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N33/00 Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
G01N33/48 Biological material, e.g. blood, urine; Haemocytometers
G01N33/50 Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
G01N33/68 involving proteins, peptides or amino acids
G01N33/6803 General methods of protein analysis not limited to specific proteins or families of proteins
G01N33/6806 Determination of free amino acids
G01N33/6812 Assays for specific amino acids