An automated kinetic method to determine creatinine in serum with the Jaffé reaction is described. The method does not require deproteinization or adsorption of creatinine on Fuller's earth or ion-exchange resin. A maximum of 29 serum samples, standards, and control sera can be assayed in less than 1.5 min. Interferences by most of the known Jaffé-positive serum constituents were studied and minimized by optimal selection of the time interval during which the reaction rate was measured. Results of precision studies and correlation with a manual method requiring adsorption of creatinine on ion-exchange resin are reported. Spectroscopic data suggest that the product of reaction between picrate and creatinine is a 1:1 adduct of the two starting molecules.
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Fabiny et al. (1971) studied this question.
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