ONP

o-nitrophenol

• Beta-galactosidase cleaves ONPG to produce ONP and galactose.
• The molar extinction coefficient is reported to be either 4500 M^-1cm^-1 [1] or 4900 M^-1cm^-1 [2] (not original references, better references would be preferable).
• Slightly soluble in water (0.21 g/100ml or 2.1mg/mL)

References

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3. Chemical information