POBN

POBN (CAS No.: 66893-81-0) is a cell-permeable, hydrophilic spin-trapping agent widely used in biomedical research to detect and characterize transient free radical species, particularly reactive oxygen and nitrogen species generated during cellular metabolism and oxidative stress. As a water-soluble analog of classical nitrone-based spin traps, POBN reacts with short-lived radicals to form more stable adducts that can be analyzed by electron spin resonance spectroscopy, enabling mechanistic investigations of radical-mediated processes. It is commonly applied in studies of mitochondrial dysfunction, inflammation, toxicology, and redox signaling, where excessive radical formation contributes to cellular injury and disease pathology. Experimental evidence demonstrates its utility in capturing radical intermediates in both in vitro systems and in vivo models, including detection of xenobiotic-derived radicals and alcohol-induced oxidative metabolites in tissues. While POBN does not act on a specific protein target, its mechanism relies on covalent trapping of free radicals, thereby serving as a functional probe of oxidative pathways rather than a modulator of signaling cascades. It is frequently employed in cell-based assays and animal studies to monitor oxidative stress dynamics, with concentrations or dosing regimens tailored to experimental context, typically within millimolar ranges in vitro or gram-per-kilogram scale in animal models.