title: Improved direct method for determination of keto acids by 2,4-dinitrophenylhydrazine.
mesh_terms: D006038:Glyoxylates / Q000032:analysis; D006835:Hydrazones / Q000302:isolation & purification; D007651:Keto Acids / Q000032:analysis*; D007656:Ketoglutaric Acids / Q000032:analysis; D008433:Mathematics; D008722:Methods; D009574:Nitro Compounds; D010659:Phenylhydrazines; D011773:Pyruvates / Q000032:analysis; D013053:Spectrophotometry; D013237:Stereoisomerism
chemical_list: D006038:Glyoxylates; D006835:Hydrazones; D007651:Keto Acids; D007656:Ketoglutaric Acids; D009574:Nitro Compounds; D010659:Phenylhydrazines; D011773:Pyruvates