p-Nitrophenyl Phosphoryl Choline is a biochemical reagent used to measure the activity of phospholipases, enzymes involved in the hydrolysis of phospholipids. This 5g pack is designed for research applications where accurate quantification of phospholipase activity is required. The substrate releases p-nitrophenol upon hydrolysis, resulting in a color change that can be easily detected. This reagent is commonly used in studies of cell signaling, membrane biology, and enzyme function. It is particularly valuable in the pharmaceutical industry for testing enzyme activity related to drug interactions, and it plays a critical role in lipid metabolism research.