10 Carboxyl Polystyrene Microsphere Manufacturers and Suppliers for Italy in 2026

Carboxyl Polystyrene Microsphere Suppliers for Italy

Carboxyl polystyrene microspheres provide reactive surfaces for biomolecule attachment. Their applications include latex agglutination, particle-enhanced immunoturbidimetry, lateral flow and fluorescent assay development.

Italian developers selecting these materials need to consider particle chemistry, optical properties, suspension formulation and continuity of supply.

This guide compares ten manufacturers and suppliers that buyers in Italy can evaluate. It includes international manufacturers and European particle specialists. Companies appear in presentation order. Confirm product availability, intended-use labeling and purchasing arrangements for the selected grade before ordering.

Quick Comparison

1. Thermo Fisher Scientific

Thermo Fisher Scientific supplies carboxyl latex beads made from polystyrene, alongside carboxylate-modified FluoSpheres containing fluorescent dyes.

These formats support different coupling and detection requirements.

Italian developers should distinguish undyed latex from fluorescent particles and select the appropriate optical format. Catalog products include research-use-only grades, so confirm the selected product’s labeling and commercial supply conditions before planning production use.

2. SANYU GROUP

SANYU GROUP is a Chinese microsphere manufacturer supplying carboxyl-functionalized polystyrene particles for diagnostic development and bioconjugation.

Its portfolio includes nonfluorescent COOH PS, colored carboxylated particles and fluorescent carboxylated microspheres.

Customization discussions can cover particle diameter, solids concentration, surface chemistry and packaging.

Italian buyers can provide their assay application and target specifications to discuss suitable samples. Pilot requirements and expected annual consumption help establish a production supply plan.

3. Merck

Merck supplies Estapor microspheres for diagnostic reagent development. Its range includes white carboxylated particles for latex turbidimetric immunoassays and dyed carboxylated particles for lateral flow.

Different grades provide choices in particle size and surface characteristics.

Developers should evaluate the selected material using their intended antibody, sample matrix and detection system. Confirm the exact grade’s formulation and available package sizes when requesting a quotation.

4. MBL Materials / MBL

IMMUTEX latex particles are manufactured by MBL Materials, with sales handled through MBL. The materials manufacturer changed its name from JSR Life Sciences Corporation in October 2025.

IMMUTEX includes plain and carboxylated polystyrene latex grades. The carboxyl series supports covalent attachment of antibodies or antigens.

Compare particle size, carboxyl content and suspension properties when selecting candidates for diagnostic latex development.

5. Polysciences

Polysciences supplies Polybead carboxylate microspheres, Fluoresbrite carboxylate fluorescent particles and dyed carboxylated options.

The portfolio is relevant when developers need to compare particle sizes and optical labels during feasibility studies.

Italian buyers should check the exact product identity, concentration and suspension formulation. Evaluate coupling and assay behavior for each candidate rather than assuming equivalent performance from similar catalog descriptions.

6. Bangs Laboratories

Bangs Laboratories supplies carboxylated polystyrene microspheres, including undyed, dyed and fluorescent formats. It also offers custom particle services and technical resources on coupling and microsphere handling.

Its distributor directory lists TEMA Ricerca and CliniSciences as Italian purchasing contacts.

Buyers should confirm the required grade’s availability, lead time and technical support arrangements, then evaluate the material within their complete assay.

7. Magsphere

Magsphere supplies carboxylated polystyrene particles and colored COOH grades. Red and blue dyed particles are relevant to visible detection formats, including lateral flow.

The company also offers custom particle synthesis.

For rapid-test development, compare particle size, color intensity, conjugate release and membrane migration. Assess test-line signal and background using the intended strip materials and running buffer.

8. microParticles GmbH

microParticles GmbH supplies functionalized polystyrene particles with carboxyl, amino and streptavidin options. Its COOH-functionalized PS products are relevant to bioconjugation and diagnostic assay development.

The company also supports discussions around additional functionalization.

Buyers should request characterization for the selected PS grade and compare particle distribution, surface properties and suspension behavior using consistent measurement methods.

9. micromod Partikeltechnologie

micromod supplies carboxylated fluorescent micromer-F particles. Its published range identifies 50 nm, 100 nm and 250 nm grades as polystyrene, while the 25 nm format uses polymethacrylate.

Larger red fluorescent PS grades are also available.

Italian developers should confirm the polymer matrix, surface chemistry and fluorescence spectrum of the exact product. This prevents materials from different polymer categories being treated as equivalent candidates.

10. Spherotech

Spherotech supplies SPHERO functionalized polystyrene particles, including carboxylated grades. Its wider portfolio includes colored and fluorescent particles for different detection formats.

These options can be evaluated for biomolecule immobilization and optical assay development.

Confirm the selected product’s surface chemistry and optical characteristics, then test conjugation, dispersion and analytical response under the intended workflow conditions.

Match the Particle Format to the Assay

The detection method determines which particle format should enter screening.

Immunoturbidimetry and agglutination: Undyed particles are commonly evaluated for analyte-dependent changes in aggregation and optical response.

Visible lateral flow: Colored particles provide labels that can be assessed through conjugate release, membrane migration and test-line development.

Fluorescent assays: Fluorescent particles require compatible excitation and emission channels. Test the signal after coupling and final formulation.

Particle diameter should be selected experimentally. A size that works well in one reagent or membrane system may behave differently in another.

Compare Surface Chemistry and Coupling Behavior

Surface carboxyl groups can be activated using carbodiimide chemistry for reaction with accessible primary amines on biomolecules.

Antibodies, proteins and appropriately amino-modified oligonucleotides can be evaluated through this attachment route.

Coupling performance depends on activation conditions, biomolecule loading and subsequent blocking or stabilization. Reported carboxyl content is therefore only one part of material selection.

Assess functional binding activity, particle aggregation, background and analytical response after conjugation. Higher ligand loading does not automatically produce a better finished assay.

Technical Specifications to Request

Interpret particle-size and surface measurements together with their methods. Values obtained through different procedures may not support a direct comparison.

Evaluate the Complete Reagent

For immunoturbidimetric development, assess baseline absorbance, reaction kinetics, analytical response, precision and the usable measuring range.

For lateral flow, evaluate conjugate-pad release, membrane migration, test-line signal and background. Include representative sample matrices.

For fluorescence applications, assess reader compatibility and fluorescence stability after conjugation and formulation.

Check dispersion before coupling and after each major processing step. Aggregation can affect handling, optical measurements and reproducibility.

Before adopting a production material, compare independent lots and assess stability in the finished reagent formulation.

Purchasing Considerations for Italian Buyers

Italian companies may purchase through local distributors, European sales offices or direct international supply.

Confirm the ordering route, technical support contact and dispatch location for the selected material. A local purchasing contact does not establish immediate stock availability.

Ask whether development samples and bulk orders follow the same specification. For customized particles, agree on acceptance criteria before pilot production.

Discuss manufacturing lead time, remaining shelf life on arrival and product-specific transport conditions. At receipt, check product identity, lot number, packaging condition and suspension behavior.

For recurring orders, define how specification changes and production scheduling will be communicated.

Compare Cost Using Actual Particle Content

Bottle volume alone does not establish material value.

For example, 10 mL at 5% w/v contains 0.5 g of solids, while 10 mL at 1% w/v contains 0.1 g.

A practical comparison also considers coupling losses, particle consumption per test, formulation work and freight. Fluorescent particles should additionally be evaluated against the instrument and signal requirements of the intended assay.

Information to Include in an RFQ

Provide:

• Intended assay and detection method.

• Required polymer, particle diameter and surface chemistry.

• Undyed, colored or fluorescent format.

• Solids concentration and preferred suspension formulation.

• Biomolecule to be attached and coupling strategy.

• Evaluation quantity, pilot requirement and annual demand.

• Required characterization and lot documentation.

• Customization or packaging requirements.

• Delivery address in Italy and desired schedule.

Frequently Asked Questions

Which Suppliers Have Listed Purchasing Contacts in Italy?

Bangs Laboratories lists TEMA Ricerca and CliniSciences in its distributor directory. Confirm the selected product’s availability and ordering arrangements with the relevant contact.

Is Every COOH Polymer Particle Made from Polystyrene?

Polymer identity varies by product. Some particle families include polystyrene, polymethacrylate or other matrices. Check the specification for the exact grade.

Does Higher Carboxyl Content Guarantee Better Sensitivity?

Assay performance also depends on functional biomolecule attachment, background, dispersion and detection conditions. Evaluate the complete reagent rather than selecting by carboxyl content alone.

Can SEM Establish Surface Carboxyl Functionalization?

SEM can show morphology and visible aggregation. Confirming carboxyl groups requires appropriate chemical characterization.

Conclusion

Selecting a carboxyl polystyrene microsphere supplier for Italy requires matching polymer identity, surface chemistry and optical format with the intended assay. Coupling evaluation, particle stability and lot consistency support dependable reagent development.

SANYU GROUP offers carboxyl polystyrene microspheres for bioconjugation and diagnostic latex development, colored carboxyl polystyrene microspheres for visible detection formats and fluorescent carboxyl polystyrene microspheres for fluorescence applications. Italian buyers can share their application and target specifications to discuss samples, customization and bulk supply.