In the Jaffe reaction, a red-orange chromogen is formed when creatinine reacts with

In the Jaffe reaction, a red-orange chromogen is formed when creatinine reacts with

• A. Aluminum magnesium silicate
• B. Creatininase
• C. Phosphocreatine
• D. Picric acid

Answer: (D)

The test relies on a colorimetric reaction where creatinine reacts with picric acid in alkaline solution to form a red-orange chromogen. This creatinine–picrate complex produces a color whose intensity tracks the creatinine concentration, which is the basis for the assay. Picric acid is the reagent that drives color formation in this method. The other options don’t produce the characteristic creatinine–picrate chromogen: aluminum magnesium silicate is not part of the Jaffe chemistry, creatininase would enzymatically break down creatinine rather than form the color, and phosphocreatine is not involved in this reaction.

The test relies on a colorimetric reaction where creatinine reacts with picric acid in alkaline solution to form a red-orange chromogen. This creatinine–picrate complex produces a color whose intensity tracks the creatinine concentration, which is the basis for the assay.

Picric acid is the reagent that drives color formation in this method. The other options don’t produce the characteristic creatinine–picrate chromogen: aluminum magnesium silicate is not part of the Jaffe chemistry, creatininase would enzymatically break down creatinine rather than form the color, and phosphocreatine is not involved in this reaction.