Used as an ion-pair reagent in reversed-phase liquid chromatography to improve the separation of ionic and highly polar compounds. It helps retain anionic species on hydrophobic stationary phases by forming ion pairs with them, enhancing peak shape and resolution. Commonly applied in the analysis of pharmaceuticals, organic acids, and biological samples where conventional methods struggle with early elution or poor separation of charged molecules. Its long alkyl chains provide strong hydrophobic interactions, making it especially effective in HPLC methods requiring precise and reproducible retention of ionic analytes.