Used as a fluorescent probe for detecting amyloid fibrils in neurodegenerative disease research, particularly in Alzheimer's and Parkinson's studies. BSB binds selectively to beta-sheet structures, enabling visualization of protein aggregates in tissue samples and live-cell imaging. It is also employed in high-throughput screening assays to identify compounds that inhibit amyloid formation. Its strong fluorescence and low background interference make it suitable for diagnostic applications and drug development.