10 Carboxyl Polystyrene Microsphere Suppliers for Spain in 2026

Carboxyl Polystyrene Microsphere Suppliers for Spain

Carboxyl polystyrene microspheres provide functional surfaces for biomolecule attachment and optical assay development. Applications include latex agglutination, immunoturbidimetric reagents, lateral flow and fluorescent detection.

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

This guide compares ten international manufacturers and suppliers that buyers in Spain can evaluate. Companies appear in presentation order. Confirm the selected grade’s polymer identity, intended-use labeling and purchasing arrangements before ordering.

Quick Comparison

1. Merck

Merck supplies Estapor microspheres for diagnostic reagent development. Its portfolio 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.

Spanish developers should evaluate the selected material using their intended antibody, sample matrix and reader. Confirm formulation, package sizes and production supply conditions when requesting a quotation.

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.

Spanish 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. Bangs Laboratories

Bangs Laboratories supplies carboxylated polystyrene microspheres for covalent biomolecule attachment. Its wider portfolio includes dyed and fluorescent carboxylated particles.

The company also offers custom particle services and technical resources on handling and coupling.

Bangs lists ImmunoStep SL in Salamanca as a distributor for Spain. Buyers should confirm the exact product’s availability, lead time and technical support arrangements through the appropriate purchasing channel.

4. Polysciences

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

The portfolio is relevant when developers need to screen different sizes or optical labels.

Compare the exact grade, solids concentration and suspension formulation. Similar catalog descriptions do not establish equivalent coupling behavior or finished-assay performance.

5. Spherotech

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

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

Confirm the selected product’s surface chemistry and optical properties, then assess conjugation, suspension stability and analytical response under the intended workflow conditions.

6. 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.

Catalog products include research-use-only grades. Spanish developers should confirm the exact product’s intended-use labeling and available commercial supply arrangements when assessing materials for a development or manufacturing project.

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 diameter, color intensity, conjugate release and membrane migration. Assess test-line signal and background using the intended strip materials and running buffer.

8. MBL Materials / MBL

MBL Materials manufactures IMMUTEX latex particles, 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 characteristics when selecting candidates for diagnostic latex development.

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.

Confirm the exact product’s polymer matrix, surface chemistry and fluorescence spectrum before treating it as a candidate for a PS-based assay.

10. 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.

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

Match the Particle Format to the Detection Method

The detection method determines which particle formats should enter screening.

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

Visible lateral flow: Colored particles provide labels whose performance depends on conjugate release, membrane migration and test-line formation.

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

Select particle diameter through testing. A size that works in one reagent or membrane system may behave differently in another.

Assess Coupling and Surface Properties Together

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

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

Coupling performance depends on the selected particle surface, activation conditions, biomolecule loading and subsequent blocking or stabilization.

Reported carboxyl content is therefore one part of material selection. Assess functional binding activity, aggregation, background and analytical response after conjugation.

Higher ligand loading does not automatically provide better sensitivity or a wider measuring range.

Technical Specifications to Compare

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

For fluorescence applications, confirm that the selected spectrum matches the reader’s optical channels.

Evaluate Samples in the Complete Assay

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

For lateral flow, examine conjugate-pad release, membrane migration, test-line signal and background. Include representative samples and the intended strip formulation.

For fluorescent assays, assess reader compatibility, background and fluorescence stability after conjugation.

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

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

Purchasing Considerations for Spanish Buyers

Spanish 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 product. A local purchasing contact does not establish immediate stock availability.

Discuss manufacturing lead time, remaining shelf life on arrival and product-specific transport conditions.

For customized particles, agree on the target specification and sample acceptance criteria before pilot production. Confirm that development samples and bulk deliveries follow the same requirements.

For recurring orders, establish how lot documentation, specification changes and production scheduling will be communicated.

Compare Quotations 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, packaging and freight.

For fluorescent particles, include the instrument and signal requirements of the intended assay when assessing overall suitability.

Information to Include in an RFQ

Provide:

• Intended assay and detection method.

• Required polymer, 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 Spain and desired schedule.

Frequently Asked Questions

Which Supplier Lists a Purchasing Contact in Spain?

Bangs Laboratories lists ImmunoStep SL in Salamanca in its distributor directory. Confirm product availability and ordering arrangements for the selected grade.

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 Assay Performance?

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

Can a Replacement Particle Use the Existing Coupling Procedure?

The existing procedure provides a starting point. A replacement may require changes to activation, loading, blocking or formulation, followed by complete assay evaluation.

Conclusion

Selecting a carboxyl polystyrene microsphere supplier for Spain requires matching polymer identity, surface chemistry and optical format with the intended assay. Sample evaluation, lot consistency and clearly defined supply arrangements 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. Spanish buyers can share their application and target specifications to discuss samples, customization and bulk supply.