p-Nitrophenyl Phosphoryl Choline, 1g, is a substrate reagent widely used in biochemical assays to study phospholipase activity and lipid metabolism. The compound consists of a choline derivative that undergoes hydrolysis in the presence of phospholipases, releasing a p-nitrophenol group that can be easily quantified using spectrophotometric methods. This reagent is critical for studying membrane biology, lipid signaling pathways, and enzyme kinetics. The 1g size is suitable for medium-scale experiments and is ideal for laboratories conducting regular assays in lipid research, enzymology, and pharmaceutical studies.