This webinar will discuss the adverse impact of particulate matter and aggregates for immunogenicity and the need to improve the characterization of submicron aggregates/particles in biopharmaceuticals. Optical Photothermal Infrared (O-PTIR) technology will be reviewed. The benefits of O-PTIR to perform nondestructive, simultaneous infrared (IR)/Raman measurements with submicron spatial resolution on particulate matter and aggregates in biopharmaceutical formulations (IV infusion in-use studies, stability and degradation studies) will be demonstrated.