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How certain drugs interfere negatively with the Jaffé reaction for creatinine
Abstract:
Phenacemide and cephalothin may interfere either positively or negatively with the determination of creatinine by the Jaffé reaction, depending on the analytical system. The drug-picrate chromophores maximally absorb within the first minute of reaction (21 s for phenacemide, 45 s for cephalothin), after which the absorbances decrease. Thus, these drugs negatively interfere in analytical systems involving kinetic measurements when the time interval of measurement includes the period of decreasing absorbance.
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