I am performing p nitrophenol acetate assay for esterase enzyme. My media contains a different concentration of peptone (0.5, 2, 5%) and after centrifugation the supernatant is slight yellow. While performing this assay the supernatant colour interferes with the end point yellow colour of p nitrophenol acetate and the reading fluctuates. Can you please guide what troubleshooting can be done.

Thank you

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