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Principle: The same as in D-122

Principle: Citrate lyase catalyzes conversion of citrate to oxaloacetate and acetate. Some oxaloacetate may be decomposed to pyruvate by oxaloacetate decarboxylase which possibly contaminates the citrate lyase preparation . Both a-ketoacids react with phenylhydrazine at acidic pH and produce phenylhydrazone which absorbes the light at 330 nm . The absorbance is directly proportional to citrate concentration.

Principle: Urine oxalate is converted to rbon dioxide and hydrogen peroxide. Hydrogen eroxide n the presence of peroxidase oxidizes a chromogen to form a colored complex . The tensity of the color is directly proportional to the concentration of oxalate and is determined colorimetrically at 578 nm

Principle: Diff-Isoton for Sysmex (K800,K1000,KX21)