Used in biochemical and cell biology research as a substrate for phosphoinositide kinases, such as PI3K and PI4K, to study the phosphorylation steps in phosphoinositide signaling pathways. These pathways are crucial for cellular processes including membrane trafficking, cytoskeletal dynamics, signal transduction, cell growth, and metabolism. Commonly employed in kinase assays to investigate the production of phosphorylated derivatives like PI(3)P, PI(4)P, and PI(4,5)P2. Also utilized in lipid-protein interaction studies and membrane reconstitution experiments to examine how signaling proteins interact with phospholipids. The sodium salt form improves solubility and stability in aqueous buffers, facilitating in vitro applications.