The red Jaffe reaction product was isolated. A yellow creatinine picrate salt and an orange compound containing two molecules of creatinine per picric acid molecule were also isolated. Spectrophotometric, pH titration, and polarographic investigation of the Jaffe reaction was undertaken. Hydantoin was shown to react similarly to creatinine, while the 5,5-dimethylhydantoin was inactive. The methylene anion of creatinine is proposed to attack the meta position of picric acid, resulting in the formation of a nitro anion. A reaction structure for the Jaffe chromogen is proposed. Das rote Produkt der /tf/jfe-Reaktion sowie ein gelbes Kreatinin-Pikrat und eine orangefarbene Verbindung aus zwei Molekülen Kreatinin pro Pikrinsäure-Molekül wurden isoliert. Die /

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