Overview
Carboxyl polystyrene is a modified form of polystyrene featuring carboxyl (-COOH) functional groups attached to its polymer backbone. These groups enable covalent bonding with biomolecules like proteins and peptides, making it valuable in life sciences and diagnostics. The material is typically supplied as uniform microspheres, with sizes ranging from nanometers to micrometers. Its synthesis involves copolymerizing styrene with carboxyl-containing monomers (e.g., acrylic acid) or post-modifying pre-formed polystyrene beads. The degree of functionalization can be tailored for specific applications, balancing reactivity with stability.
Physical and Chemical Properties
Carboxyl polystyrene exhibits the rigidity and chemical resistance of standard polystyrene while gaining reactivity from its carboxyl groups. The surface charge is negative due to deprotonated carboxylates at neutral pH, which aids in electrostatic binding of positively charged molecules. The microspheres are thermally stable up to 200°C but degrade at higher temperatures. They swell slightly in solvents like toluene or DMF but retain structural integrity. Particle size uniformity (often ±5% CV) is critical for applications like chromatography, where flow dynamics depend on consistent bead dimensions.
Main Applications
In chromatography, carboxyl polystyrene serves as a stationary phase for ion-exchange or affinity purification of proteins and nucleic acids. Its carboxyl groups can be activated (e.g., via EDC/NHS chemistry) to immobilize antibodies or enzymes for diagnostic test kits. The material is also used in research for protein conjugation, drug delivery carriers, and solid-phase peptide synthesis. In diagnostics, it forms the basis of latex agglutination tests, where antibody-coated beads detect antigens in clinical samples.
Safety and Storage
While non-toxic, carboxyl polystyrene dust may irritate respiratory tracts; handling with masks and in fume hoods is advised. The beads are non-flammable but should be kept away from strong oxidizers. Storage requires airtight containers to prevent moisture absorption, which can reduce reactivity. Long-term stability is ensured at room temperature; refrigerated storage is unnecessary unless specified for specific functionalized derivatives.
B2B Procurement Guide
Buyers should prioritize suppliers offering certificates of analysis (CoA) detailing particle size distribution, carboxyl group density (in mmol/g), and residual monomer content. Bulk orders (1–100 kg) commonly attract discounts of 10–20%. For chromatography resins, request pressure-flow data to assess packing efficiency. Custom modifications (e.g., fluorescent labeling) may extend lead times by 2–4 weeks. Sample testing is recommended to confirm batch-to-batch consistency.
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