title: An improved procedure for preparing the n-butyl-trifluoroacetyl amino acid derivatives and its application in the study of radioactive amino acids from biological sources.
mesh_terms: D000596:Amino Acids / Q000302:isolation & purification; D000818:Animals; D002250:Carbon Radioisotopes; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange; D005463:Fluoroacetates; D005724:Ganglia / Q000032:analysis; D006868:Hydrolysis; D007328:Insulin / Q000032:analysis; D007475:Ion Exchange Resins; D008722:Methods; D008832:Microchemistry; D009994:Osmolar Concentration; D051381:Rats; D012997:Solvents; D013696:Temperature; D014357:Trypsin / Q000032:analysis
chemical_list: D000596:Amino Acids; D002250:Carbon Radioisotopes; D005463:Fluoroacetates; D007328:Insulin; D007475:Ion Exchange Resins; D012997:Solvents; D014357:Trypsin