CD Bioparticles has developed a large selection of polystyrene micro- and nanoparticles. Polystyrene particles are prepared by using emulsion and emulsion-free polymerization process. Coated or conjugated particles are prepared either by passive adsorption or covalent coupling. Functionalized polystyrene nanoparticles and polystyrene particles can be applied for a variety of applications such as drug delivery materials, bioimaging, markers and immunoassay. With superior stability, high binding capacity and ultra-high specificity (low background), polystyrene latex particles have been extensively validated in immunoturbidimetric assays at both academic and industrial scales.