FIELD: analytic chemistry. SUBSTANCE: excess of 7-chlorine-4,6-dinitrobenzofuroxane solution in organic solvent is added into sample. Thus prepared solution is neutralized, its optical density is registered at wave- length 500-550 nm. Proposed method enables selective determination of proline or triptophan in the presence of other aminoacids. EFFECT: improves efficiency of the method. 1 tbl
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