4-Nitrophenyl Phenylphosphonate, 5g, is a reagent used in biochemical assays to investigate phosphatase and phosphodiesterase activity. When cleaved by enzymes, the substrate releases a yellow-colored p-nitrophenyl compound, which is used as an indicator of enzyme activity in colorimetric assays. This reagent is frequently employed in enzyme research, particularly in studies on phosphatases and phosphodiesterases, and is useful in enzyme kinetics, metabolic studies, and molecular biology research. The 5g size is ideal for larger-scale experiments or repeated assays, offering a cost-effective solution for routine laboratory work and advanced enzymatic testing.