172 nm Carboxyl Polystyrene Microspheres, 5% Solids – CP172-50

Product Overview

SANYU GROUP 172 nm Carboxyl Polystyrene Microspheres (CP172-50) are premium-quality polymer microspheres functionalized with surface carboxyl (–COOH) groups. Manufactured using advanced emulsion polymerization technology, these microspheres provide excellent monodispersity, outstanding suspension stability and reliable batch-to-batch consistency for demanding life science and diagnostic applications.

CP172-50 has a nominal particle diameter of 172 nm (0.172 μm) and is supplied as a 5% solids aqueous suspension with a typical surface carboxyl content of 96 μeq/g. The surface carboxyl groups can be activated using EDC or EDC/NHS chemistry for efficient covalent conjugation of antibodies, proteins, peptides, enzymes, DNA, RNA and other biomolecules.

With excellent particle uniformity and stable surface chemistry, CP172-50 is widely used in immunodiagnostics, ELISA, lateral flow immunoassays (LFIA), biosensors, molecular diagnostics, flow cytometry, particle size calibration and life science research.

Key Features

• Nominal particle diameter: 172 nm

• 5% solids aqueous suspension

• Surface carboxyl content: 96 μeq/g

• Monodisperse spherical particles

• Surface carboxyl (-COOH) functional groups

• Excellent particle size uniformity

• High suspension stability

• Low coefficient of variation (CV)

• High biomolecule coupling efficiency

• Compatible with EDC and EDC/NHS chemistry

• Excellent batch-to-batch consistency

• Suitable for research and IVD reagent development

• OEM and customized manufacturing available

Technical Specifications

Applications

CP172-50 Carboxyl Polystyrene Microspheres are widely used in:

• Antibody conjugation

• Protein immobilization

• Peptide coupling

• DNA and RNA immobilization

• Immunoassay development

• Lateral Flow Immunoassays (LFIA)

• ELISA development

• Flow cytometry

• Latex agglutination assays

• Particle size calibration

• Instrument calibration

• Biosensor development

• Molecular diagnostics

• Clinical diagnostics

• Biotechnology research

• Life science research

Advantages of SANYU Carboxyl Polystyrene Microspheres

SANYU GROUP manufactures high-quality carboxyl-functionalized microspheres under strict quality control to ensure excellent product consistency and reliable performance.

Advantages include:

• Excellent particle size uniformity

• Highly monodisperse particles

• Stable surface chemistry

• High surface carboxyl functionality for efficient biomolecule coupling

• Reliable conjugation performance

• Low particle aggregation

• Long-term suspension stability

• Excellent reproducibility

• OEM and bulk production support

• Professional technical support

Surface Chemistry

CP172-50 contains abundant surface carboxyl (-COOH) functional groups with a typical surface carboxyl content of 96 μeq/g, providing reactive sites for covalent biomolecule immobilization.

Using EDC or EDC/NHS activation chemistry, the surface carboxyl groups react efficiently with primary amine groups to form stable amide bonds.

Typical conjugated biomolecules include:

• Antibodies

• Antigens

• Proteins

• Peptides

• Enzymes

• DNA

• RNA

• Oligonucleotides

• Aptamers

Storage and Stability

Store CP172-50 at 2–8°C.

• Do not freeze.

• Mix gently before use.

• Avoid repeated freeze-thaw cycles.

• Protect from direct sunlight.

Proper storage helps maintain excellent particle stability and conjugation performance.

Customization Service

SANYU GROUP offers comprehensive customization services, including:

• Customized particle diameter

• Customized solids content

• Customized surface carboxyl density

• Surface functionalization

• Buffer replacement

• Fluorescent microspheres

• Magnetic microspheres

• Colored microspheres

• Packaging customization

• OEM manufacturing

• Bulk production

Frequently Asked Questions About CP172-50

What is CP172-50?

CP172-50 is a 172 nm carboxyl-functionalized polystyrene microsphere supplied as a 5% solids aqueous suspension with a typical surface carboxyl content of 96 μeq/g for diagnostics, calibration and life science research.

What particle size is CP172-50?

CP172-50 has a nominal particle diameter of 172 nm with excellent particle size uniformity.

Is 172 nm the same as 0.172 μm?

Yes.

172 nm = 0.172 μm.

What is the surface carboxyl content of CP172-50?

CP172-50 has a typical surface carboxyl content of 96 μeq/g.

The abundant surface carboxyl groups provide reactive sites for efficient covalent coupling of antibodies, proteins, peptides, enzymes and nucleic acids.

Is CP172-50 suitable for particle size calibration?

Yes.

Its excellent monodispersity makes it suitable for particle sizing and instrument calibration.

Can CP172-50 be used for flow cytometry?

Yes.

CP172-50 is suitable for flow cytometry research and assay development.

Can antibodies or proteins be conjugated?

Yes.

The surface carboxyl groups can be activated using EDC or EDC/NHS chemistry for efficient covalent coupling with antibodies, proteins, peptides, enzymes and nucleic acids.

What does 5% solids mean?

CP172-50 is supplied as a 5% solids aqueous suspension, providing a stable particle concentration for research and diagnostic applications.

How should CP172-50 be stored?

Store at 2–8°C.

Do not freeze.

Avoid repeated freeze-thaw cycles.

Mix gently before each use.

Can the particle size, solids content or surface carboxyl density be customized?

Yes.

SANYU GROUP provides customization services including particle diameter, solids concentration, surface carboxyl density, surface functionalization, buffer formulation, package size and OEM production.

Do you provide samples?

Yes.

Sample availability depends on the requested specification, quantity and destination country.

Please contact our sales team with your application details.

What documents are available?

SANYU GROUP can provide:

• Certificate of Analysis (COA)

• Technical Data Sheet (TDS)

• Safety Data Sheet (SDS)

• Product Specification

• Particle Size Distribution Report (when available)

Request a Sample or Quotation

Looking for 172 nm Carboxyl Polystyrene Microspheres with 5% solids and a surface carboxyl content of 96 μeq/g?

Contact SANYU GROUP with your application requirements and quantity. Our technical team will recommend the most suitable standard or customized microsphere solution.