[The determination of creatinine--the Jaffe reaction 100 years later. On the occasion of the 75th anniversary of the death of Max Jaffe, discoverer of the picric acid reaction of creatinine]. / Kreatininbestimmung--100 Jahre Jaffe-Reaktion. Zur Erinnerung an den 75. Todestag von Max Jaffe, dem Entdecker der Pikrinsäurereaktion des Kreatinins.

In this article is called to mind that over 100 years ago Max Jaffe (1841-1911) for the first time described the picric acid reaction of creatinine, on which are based the at present performed methods of determination of this metabolic end product on the clinical diagnostics. A short biography of the researcher is given and his particular merits for biochemistry are appreciated in the light of the scientific subjects he dealt with.