Latex beads, carboxylate-modified polystyrene, are widely used in biomedical research and diagnostics. They serve as essential tools in immunoassays, where they act as solid supports for the immobilization of antibodies or antigens, enabling the detection of specific biomolecules. These beads are also utilized in flow cytometry for cell sorting and analysis, as their uniform size and surface properties allow for precise labeling and detection. In addition, they are employed in protein purification processes, where their carboxylate groups facilitate the binding of target proteins for separation. Their biocompatibility and customizable surface chemistry make them valuable in drug delivery systems, where they can be engineered to carry and release therapeutic agents. Furthermore, these beads are used in calibration standards for particle size analyzers and microscopes, ensuring accurate measurements in various scientific applications.