1UM Epoxy Magnetic Beads MEP1UM-10 5%

1µm Epoxy Magnetic Beads for Chemiluminescent Immunoassays

SHBC MEP1UM-10 Epoxy Magnetic Beads are 1µm magnetically responsive microspheres with epoxy-functional surfaces developed for covalent immobilization of antibodies, antigens, proteins, peptides, enzymes, lectins, haptens, and other biomolecules.

The product is supplied as a 5% solids suspension and is designed for chemiluminescent immunoassay development, chemiluminescent enzyme immunoassays, magnetic bead-based immunoassays, affinity capture, antibody immobilization, protein coupling, and automated reagent manufacturing.

The surface epoxy groups enable direct covalent coupling with suitable nucleophilic groups on biomolecules, particularly primary amines and sulfhydryl groups. A separate carbodiimide activation step is normally unnecessary, simplifying ligand immobilization and reducing the number of reagents required during magnetic reagent preparation.

Shanghai SanYu Biotechnology Co., Ltd. supports laboratory sample evaluation, coupling-process development, pilot production, repeated manufacturing, OEM projects, and enterprise bulk supply.

Quick Product Answer

MEP1UM-10 is a 1µm epoxy-functional magnetic bead suspension supplied at 5% solids. It is designed for covalent antibody, antigen, protein, peptide, and enzyme immobilization in chemiluminescent immunoassay, magnetic immunoassay, affinity capture, and automated reagent-development projects.

Product Highlights

• Product name: 1µm Epoxy Magnetic Beads

• Catalog number: MEP1UM-10

• Brand: SHBC

• Manufacturer: Shanghai SanYu Biotechnology Co., Ltd.

• Nominal particle diameter: 1µm

• Surface functionality: Epoxy

• Solids content: 5%

• Separation method: Magnetic separation

• Coupling mode: Direct covalent ligand immobilization

• Typical reactive ligand groups: Primary amines and sulfhydryl groups

• Primary application: Chemiluminescent immunoassay development

• Supply capability: Samples, pilot batches, and bulk manufacturing

• Customization: Available according to technical feasibility

• Intended use: Research use only

What Are MEP1UM-10 Epoxy Magnetic Beads?

MEP1UM-10 consists of 1µm magnetic microspheres carrying reactive epoxy groups on the outer surface.

The epoxy functionality provides a direct route for covalent ligand immobilization. Antibodies, antigens, proteins, peptides, enzymes, and other suitable biomolecules can be coupled to the beads through nucleophilic groups present in the ligand.

After coupling, the magnetic bead–ligand conjugate can be used as a solid phase for capturing target analytes from biological samples.

A typical immunoassay configuration may be represented as:

Epoxy Magnetic Bead – Capture Antibody – Target Analyte – Labeled Detection Antibody

The detection label may generate a chemiluminescent signal directly or through an enzyme-catalyzed substrate reaction.

Potential product-development uses include:

• Chemiluminescent immunoassays

• Chemiluminescent enzyme immunoassays

• Magnetic sandwich immunoassays

• Competitive immunoassays

• Antibody immobilization

• Antigen immobilization

• Peptide immobilization

• Enzyme immobilization

• Affinity capture

• Biomarker detection

• Protein interaction analysis

• Automated magnetic washing systems

The 1µm particle size provides a large number of particles per unit mass and a high collective surface area compared with larger micron-sized magnetic beads.

This can be beneficial when an assay requires:

• Rapid binding kinetics

• Numerous independent capture surfaces

• Efficient suspension mixing

• High event frequency

• Low bead consumption per test

• Compatibility with compact automated reaction systems

MEP1UM-10 is supplied as a raw material for research and reagent development. It is not a finished diagnostic kit or independently validated clinical reagent.

MEP1UM-10 Technical Specifications

The following parameters should be confirmed using the final specification or lot-specific Certificate of Analysis:

• Particle matrix

• Magnetic material

• Mean particle diameter

• Particle-size distribution

• Particle-size coefficient of variation

• Particle morphology

• Epoxy-group density

• Magnetic content

• Magnetic response time

• Residual magnetism

• Ligand-coupling capacity

• Particle-number concentration

• Suspension buffer

• Buffer pH

• Stabilizer or surfactant

• Preservative

• Package size

• Shelf life

• Storage conditions

The 5% solids concentration alone cannot determine the number of beads per milliliter, epoxy-group density, antibody-loading capacity, or magnetic separation time.

These values should be based on actual SHBC testing and lot-specific documentation.

How Epoxy Surface Coupling Works

Epoxy groups can react with suitable nucleophilic groups on biomolecules to form stable covalent bonds.

Common reactive groups on biological ligands include:

• Primary amino groups

• Sulfhydryl groups

• Selected hydroxyl groups under appropriate conditions

Primary amino groups may be present on:

• Lysine side chains

• Protein N-termini

• Peptide N-termini

• Amino-modified oligonucleotides

• Amino-modified synthetic ligands

Sulfhydryl groups may be present on:

• Cysteine residues

• Reduced antibody fragments

• Thiol-modified peptides

• Thiol-modified oligonucleotides

• Synthetic thiol-containing ligands

General Coupling Structure

A simplified coupling structure may be represented as:

Magnetic Bead – Epoxy Group + Ligand Nucleophile → Covalently Coupled Ligand

No EDC/NHS activation is normally required because the bead surface is already reactive.

Factors Affecting Epoxy Coupling

Coupling performance may be influenced by:

• Ligand type

• Ligand molecular weight

• Available amino or thiol groups

• Ligand concentration

• Bead concentration

• Epoxy-group density

• Buffer composition

• Buffer pH

• Salt concentration

• Incubation temperature

• Incubation time

• Mixing method

• Ligand stability

• Surface crowding

The best coupling conditions should be optimized using the actual antibody, antigen, protein, peptide, or enzyme.

Random and Site-Directed Coupling

Coupling through naturally occurring amino groups generally creates a random ligand orientation.

Random coupling is convenient but may place some antigen-binding sites close to the bead surface.

More controlled orientation may be investigated by:

• Introducing a defined thiol group

• Using an antibody fragment with an accessible cysteine

• Adding a spacer arm

• Using an adapter protein

• Optimizing ligand loading

• Comparing different coupling pH values

The selected strategy should balance coupling efficiency, ligand activity, assay sensitivity, and manufacturing reproducibility.

Why Choose 1µm Epoxy Magnetic Beads?

Direct Covalent Coupling

The epoxy surface allows biomolecules to be immobilized without first activating the magnetic beads with carbodiimide reagents.

This can simplify manufacturing by reducing:

• Activation steps

• Activation reagents

• Intermediate washing

• Process variability

• Time between activation and coupling

Stable Ligand Immobilization

Covalent attachment can reduce ligand loss during:

• Washing

• Storage

• Sample incubation

• Repeated magnetic separation

• Automated reagent processing

This is important for chemiluminescent immunoassays, where unstable capture-ligand attachment may reduce signal consistency and shelf life.

High Collective Surface Area

At the same mass concentration, 1µm particles provide more individual beads and more collective surface area than larger particles made from similar materials.

This may support:

• Rapid target capture

• Efficient mixing

• Increased interaction frequency

• High bead counts per reaction

• Small reaction volumes

• Automated assay miniaturization

Rapid Magnetic Processing

Magnetic beads enable the solid phase to be collected using an external magnetic field.

This supports:

• Automated washing

• Removal of unbound sample components

• Separation of bound and free reagents

• Buffer exchange

• Reagent concentration

• Repeated incubation cycles

Actual magnetic separation time depends on the magnetic content, bead concentration, sample volume, viscosity, vessel geometry, and magnet design.

Suitable for CLIA Automation

The small particle size and magnetic separation format may support automated chemiluminescent immunoassay workflows involving:

• Reagent aspiration

• Bead dispensing

• Sample incubation

• Magnetic capture

• Automated washing

• Reporter incubation

• Substrate addition

• Luminescence measurement

Automation compatibility must be confirmed on the intended instrument.

Flexible Ligand Selection

The epoxy surface may be used with a broad range of suitable ligands, including antibodies, antigens, proteins, peptides, enzymes, lectins, and amino- or thiol-modified molecules.

Key Features and Benefits

1µm Nominal Particle Diameter

The small micron-sized beads provide a high particle number and large collective reaction surface.

Epoxy-Functional Surface

The reactive surface supports direct covalent immobilization of suitable biomolecules.

5% Solids Suspension

The supplied concentration supports laboratory dilution, pilot-process development, and production-scale reagent preparation.

Magnetic Separation

The beads can be collected and washed using an appropriate magnetic separator.

Stable Antibody and Protein Coupling

Covalent ligand immobilization can support repeated washing and long-term reagent-development studies.

Suitable for Automated Assays

MEP1UM-10 may be evaluated in manual, semi-automated, and fully automated magnetic immunoassay workflows.

Broad Biomolecule Compatibility

Potential coupling targets include antibodies, antigens, proteins, peptides, enzymes, lectins, and modified nucleic acid probes.

Research-to-Manufacturing Supply

SHBC supports sample testing, pilot production, repeated orders, OEM cooperation, and bulk manufacturing.

Custom Development Support

Particle size, magnetic response, epoxy density, solids concentration, buffer, preservative, packaging, and quality-control specifications may be discussed for qualified projects.

Applications in CLIA and Immunoassay Development

Chemiluminescent Sandwich Immunoassays

MEP1UM-10 may be used as a magnetic solid phase in sandwich immunoassays.

A typical format includes:

1. Coupling a capture antibody to the epoxy magnetic beads.

2. Blocking or quenching remaining reactive sites.

3. Incubating the beads with the test sample.

4. Capturing the target antigen.

5. Adding a labeled detection antibody.

6. Magnetically separating the bead complexes.

7. Washing away unbound reagents.

8. Adding a chemiluminescent substrate.

9. Measuring the emitted light.

Potential research targets include:

• Hormones

• Cytokines

• Tumor-associated biomarkers

• Cardiac biomarkers

• Inflammatory markers

• Infectious-disease antigens

• Autoantibodies

• Therapeutic-drug targets

• Veterinary biomarkers

• Food-safety analytes

• Environmental analytes

Chemiluminescent Enzyme Immunoassays

The detection antibody may carry an enzyme label such as an appropriate peroxidase or phosphatase system.

After magnetic washing, the corresponding chemiluminescent substrate can be added and measured using a compatible analyzer.

The enzyme, substrate, signal kinetics, incubation time, and measurement window must be optimized together.

Competitive Immunoassays

MEP1UM-10 may be used in competitive assay formats for:

• Small molecules

• Drugs

• Haptens

• Hormones

• Metabolites

• Toxins

• Peptides

• Targets with one accessible epitope

The measured signal may increase or decrease with target concentration depending on the assay design.

Antigen-Coated Magnetic Beads

Antigens or recombinant proteins may be coupled to the beads for:

• Antibody detection

• Serological assay development

• Autoantibody research

• Vaccine-response studies

• Antibody-screening projects

• Hybridoma screening

• Binding-specificity studies

Peptide and Hapten Immobilization

Epoxy magnetic beads may be suitable for immobilizing small antigens, peptides, or haptens when suitable reactive groups are available.

Potential applications include:

• Epitope-specific antibody detection

• Competitive assays

• Drug monitoring

• Toxin detection

• Small-molecule research

• Antibody-specificity studies

Enzyme Immobilization

Functional enzymes may be coupled to the magnetic beads for:

• Enzyme activity assays

• Biosensor development

• Biocatalysis research

• Reporter-system development

• Reusable magnetic enzyme systems

The coupling process must preserve sufficient enzyme activity.

Affinity Capture and Protein Research

MEP1UM-10 may also be evaluated for:

• Immunoprecipitation

• Protein complex capture

• Antibody purification research

• Antigen enrichment

• Ligand-binding studies

• Biomolecule separation

• Protein interaction analysis

Biomolecules Suitable for Epoxy Coupling

Antibodies

Potential formats include:

• Monoclonal antibodies

• Polyclonal antibodies

• Full-length IgG

• IgM

• Fab fragments

• F(ab′)₂ fragments

• Recombinant antibodies

• Single-domain antibodies

• Engineered antibody formats

Antigens and Recombinant Proteins

Potential ligands include:

• Recombinant antigens

• Viral proteins

• Bacterial proteins

• Tumor-associated proteins

• Hormones

• Cytokines

• Enzymes

• Receptors

• Fusion proteins

Peptides

Peptides may be coupled through suitable amino or thiol groups.

Applications may include:

• Epitope mapping

• Antibody screening

• Competitive assays

• Small-antigen presentation

• Receptor-binding studies

Enzymes

Enzymes may be immobilized for downstream activity or detection applications.

Evaluate enzyme activity before and after coupling.

Lectins and Carbohydrate-Binding Proteins

Lectins may be immobilized for:

• Glycoprotein capture

• Cell-surface carbohydrate studies

• Glycan analysis

• Affinity enrichment

Modified Oligonucleotides

Amino- or thiol-modified oligonucleotides may be evaluated for coupling when the modification and reaction conditions are compatible with the epoxy surface.

Recommended Ligand Coupling Workflow

The following workflow is a general development starting point. Final conditions must be optimized using the actual MEP1UM-10 specification and selected biomolecule.

1. Resuspend the Magnetic Beads

Allow the product to reach the recommended handling temperature.

Mix by gentle inversion or controlled vortexing until the suspension is homogeneous.

Do not rely on visual appearance alone to confirm complete redispersion.

2. Transfer the Required Bead Quantity

Calculate the amount required according to:

• Number of tests

• Bead mass per test

• Assay volume

• Expected target concentration

• Desired capture capacity

• Number of washes

• Expected process loss

Use clean, low-binding tubes and pipette tips.

3. Magnetically Separate the Beads

Place the tube in a compatible magnetic separator.

Allow the beads to collect until the supernatant becomes sufficiently clear.

Remove the supernatant without disturbing the magnetic bead pellet.

4. Wash the Beads

Wash the beads with the selected coupling buffer.

The coupling buffer should be compatible with:

• Epoxy chemistry

• Ligand stability

• Required pH

• Required salt concentration

• Downstream assay performance

Avoid buffers containing high concentrations of free amines or thiols during the coupling step because these substances may compete with the ligand for epoxy groups.

5. Prepare the Ligand

Prepare the antibody, antigen, protein, peptide, or enzyme in a compatible buffer.

Evaluate:

• Ligand concentration

• Ligand purity

• Protein aggregation

• Available reactive groups

• Buffer additives

• Stabilizers

• Reducing agents

• Preservatives

• Ligand stability

6. Add the Ligand to the Beads

Combine the washed beads with the selected ligand.

Maintain gentle mixing to keep the 1µm beads uniformly suspended.

7. Optimize the Coupling Reaction

Evaluate:

• Bead concentration

• Ligand concentration

• Ligand-to-bead ratio

• Buffer pH

• Salt concentration

• Incubation time

• Incubation temperature

• Mixing speed

• Total reaction volume

Epoxy coupling may require a longer incubation than adsorption-based coating methods.

The best condition is the one that provides adequate ligand loading while preserving biological activity.

8. Magnetically Wash the Coupled Beads

After coupling, magnetically separate the beads and remove unbound ligand.

Wash the particles using a suitable post-coupling buffer.

Collect the supernatants when coupling efficiency will be evaluated by protein mass balance.

9. Quench Remaining Reactive Groups

Unreacted epoxy groups may be quenched using an application-compatible reagent.

The quenching reagent and conditions must be selected according to:

• Remaining epoxy activity

• Assay requirements

• Ligand stability

• Background signal

• Storage stability

10. Block and Formulate the Beads

A blocking or stabilization step may be evaluated to reduce non-specific adsorption and improve reagent stability.

Possible formulation components may include:

• Protein blockers

• Synthetic blocking polymers

• Compatible surfactants

• Sugars

• Salts

• Preservatives

• Buffering agents

Final formulation should be optimized for the chemiluminescent assay.

Chemiluminescent Immunoassay Development Workflow

1. Prepare Capture-Antibody Magnetic Beads

Couple the selected capture antibody to MEP1UM-10.

Wash, quench, block, and formulate the conjugated beads.

2. Prepare Controls

Recommended controls may include:

• Assay-buffer blank

• Uncoupled epoxy magnetic beads

• Quenched beads without capture antibody

• Negative sample

• Positive sample

• Detection-antibody-only control

• Substrate blank

• Non-relevant antibody-coated beads

• High-concentration interference control

3. Add the Test Sample

Combine the antibody-coated magnetic beads with the sample.

Optimize:

• Bead concentration

• Bead mass per test

• Sample volume

• Sample dilution

• Incubation time

• Incubation temperature

• Mixing method

• Target concentration range

4. Magnetically Separate and Wash

Capture the beads with an appropriate magnetic field.

Remove unbound sample components and wash the beads using a validated wash program.

5. Add the Detection Reagent

Add the labeled detection antibody or reporter conjugate.

Optimize:

• Reporter concentration

• Incubation time

• Incubation temperature

• Mixing

• Assay sequence

• Wash conditions

6. Perform Final Magnetic Washing

Remove unbound reporter thoroughly.

Residual reporter may increase background luminescence.

7. Add the Chemiluminescent Substrate

Add the selected substrate according to the detection-label system.

Control:

• Substrate volume

• Mixing

• Incubation time

• Measurement delay

• Temperature

• Signal integration time

8. Measure the Signal

Possible analytical outputs include:

• Relative light units

• Signal-to-background ratio

• Dose-response curve

• Assay sensitivity

• Detection-limit research

• Precision

• Recovery

• Linearity

• Specificity

• Cross-reactivity

9. Establish the Calibration Model

Use appropriate calibrators and controls to establish the relationship between analyte concentration and luminescent signal.

MEP1UM-10 itself is a raw magnetic solid phase and is not an assigned assay calibrator.

Magnetic Separation and Automated Washing

Magnetic Response

Magnetic response determines how rapidly the beads can be collected during washing.

Important variables include:

• Magnetic material content

• Particle diameter

• Bead concentration

• Sample viscosity

• Vessel shape

• Liquid height

• Magnet strength

• Magnet position

• Separation time

Automated Analyzer Compatibility

For automated immunoassay development, evaluate:

• Bead aspiration

• Dispensing accuracy

• Suspension homogeneity

• Magnetic capture time

• Residual bead loss

• Wash efficiency

• Carryover

• Mixing performance

• Reagent stability

• Cuvette or reaction-cup compatibility

Bead Resuspension

After magnetic capture, the beads must redisperse consistently.

Poor redispersion can cause:

• Variable bead counts

• Reduced target capture

• Broad assay variation

• Incomplete washing

• Bead carryover

• Instrument blockage

Evaluate resuspension using the actual analyzer mixing system.

Wash Optimization

A suitable wash program should remove unbound reagents while minimizing bead loss.

Evaluate:

• Number of washes

• Wash volume

• Wash-buffer composition

• Magnet time

• Aspiration position

• Residual liquid volume

• Resuspension time

• Mixing strength

Blocking and Non-Specific Binding Control

High non-specific binding can increase background chemiluminescence and reduce assay sensitivity.

Potential causes include:

• Unreacted epoxy groups

• Excess capture antibody

• Inadequate quenching

• Inadequate blocking

• Excess detection antibody

• Hydrophobic interactions

• Protein aggregation

• Incomplete washing

• Incompatible buffer

• Sample-matrix interference

Optimize Quenching

Remaining epoxy groups should be quenched using an application-compatible method.

Evaluate background before and after quenching.

Screen Blocking Reagents

Potential blockers may include:

• Bovine serum albumin

• Casein

• Fish gelatin

• Non-immune immunoglobulin

• Synthetic polymers

• Commercial immunoassay blockers

The selected blocker should reduce background without reducing target-specific signal.

Titrate Capture Antibody

Excessive antibody loading may cause:

• Steric crowding

• Reduced antigen accessibility

• Increased reagent consumption

• Higher non-specific adsorption

• Poorer batch reproducibility

Titrate Detection Antibody

An excessive detection-antibody concentration may increase background luminescence.

Evaluate several concentrations using positive and negative samples.

Optimize Wash Buffer

Consider:

• Buffer pH

• Ionic strength

• Detergent level

• Protein content

• Preservative

• Sample-matrix compatibility

How to Evaluate Coupling Efficiency

Protein Mass Balance

Measure the ligand concentration before and after coupling.

A basic calculation may compare:

• Initial ligand amount

• Ligand remaining in the supernatant

• Ligand detected in wash fractions

The difference provides an estimate of protein uptake.

Protein uptake does not automatically equal active ligand density.

Fluorescent Ligand Measurement

A fluorescently labeled portion of the ligand may be used to evaluate bead-associated fluorescence.

Controls should account for:

• Free fluorescent ligand

• Non-specific adsorption

• Fluorescence quenching

• Instrument linearity

• Bead concentration

Functional Binding Assay

The most useful coupling measurement is often a functional assay.

For antibody-coated beads, evaluate:

• Target-binding capacity

• Signal-to-background ratio

• Dose-response performance

• Specificity

• Recovery

• Reproducibility

Surface-Reactive Group Testing

Epoxy-group density may be evaluated using an appropriate model nucleophile and validated analytical method.

Coupling Parameters to Record

Record:

• Product lot number

• Bead mass

• Ligand identity

• Ligand lot

• Ligand concentration

• Coupling buffer

• pH

• Salt concentration

• Incubation time

• Incubation temperature

• Mixing method

• Quenching conditions

• Blocking formulation

• Final storage buffer

• Coupling-efficiency result

• Functional assay result

Epoxy vs Carboxyl, Amino, Tosyl and Streptavidin Beads

Choose Epoxy Magnetic Beads When:

• Direct covalent ligand immobilization is preferred.

• The ligand contains suitable amino or thiol groups.

• A stable magnetic conjugate is required.

• Avoiding EDC/NHS activation is beneficial.

• Antibodies, antigens, peptides or enzymes will be immobilized.

• Automated chemiluminescent immunoassays are being developed.

Choose Carboxyl Magnetic Beads When:

• A well-established EDC/NHS coupling process is available.

• Amide-bond formation is preferred.

• Activation and coupling can be tightly controlled.

Choose Streptavidin Magnetic Beads When:

• The ligand is already biotinylated.

• Rapid modular loading is required.

• The capture ligand must be easily replaced.

The final surface should be selected through assay comparison rather than theoretical coupling capacity alone.

Quality Control and Batch Consistency

Potential quality-control parameters for MEP1UM-10 include:

• Mean particle diameter

• Particle-size distribution

• Particle-size coefficient of variation

• Particle morphology

• Suspension appearance

• Solids content

• Epoxy-group density

• Magnetic material content

• Magnetic response time

• Redispersion performance

• Aggregate level

• Ligand-coupling capacity

• Functional antibody activity

• Non-specific binding

• Background chemiluminescence

• Bead recovery

• Automation performance

• Microbial control

• Packaging integrity

• Storage stability

• Lot-to-lot consistency

Particle-Size Quality Control

Particle-size testing may include:

• Mean diameter

• Median diameter

• Size distribution

• Coefficient of variation

• Aggregate percentage

• Microscopy or instrumental analysis

Magnetic Quality Control

Potential magnetic tests include:

• Magnetic collection time

• Percentage bead recovery

• Residual beads in the supernatant

• Redispersion after magnetic capture

• Performance in different vessel geometries

• Performance at different sample viscosities

Epoxy Functionality Testing

Surface functionality may be evaluated using:

• Model amine-containing ligands

• Model thiol-containing ligands

• Fluorescent probes

• Protein uptake

• Functional antibody coupling

CLIA Functional Quality Control

A chemiluminescent assay model may evaluate:

• Negative-sample background

• Positive-sample signal

• Signal-to-background ratio

• Dose-response curve

• Precision

• Bead recovery

• Wash efficiency

• Automation repeatability

Lot-Specific Documentation

Available documentation may include:

• Certificate of Analysis

• Product specification

• Particle-size results

• Solids-content results

• Magnetic-response results

• Surface-functionality results

• Coupling-capacity results

• Safety Data Sheet

• Handling instructions

• Storage recommendations

• Lot number

• Production date

Required tests and acceptance limits should be agreed upon before bulk production.

Bulk Manufacturing and Customization

Shanghai SanYu Biotechnology Co., Ltd. supplies SHBC epoxy magnetic beads for laboratory research, immunoassay development, pilot manufacturing, repeated production, and enterprise bulk purchasing.

Research Sample Evaluation

Samples may be evaluated for:

• Particle dispersion

• Magnetic response

• Antibody coupling

• Protein coupling

• Coupling efficiency

• Ligand activity

• Non-specific binding

• CLIA background

• Signal-to-background ratio

• Automation compatibility

Pilot-Scale Development

Pilot batches may support:

• Coupling-process optimization

• Quenching and blocking studies

• Stability studies

• Magnetic wash-program development

• Buffer selection

• Preservative evaluation

• Packaging evaluation

• Quality-control development

• Customer verification

• Process transfer

Bulk Production

Bulk production can be arranged after technical requirements and release specifications have been confirmed.

Please provide:

• Required quantity

• Expected annual purchasing volume

• Preferred package size

• Intended CLIA or immunoassay application

• Type of coupling ligand

• Required coupling capacity

• Required magnetic response

• Required solids content

• Buffer requirements

• Preservative restrictions

• Quality-control requirements

• Documentation requirements

• Delivery schedule

• Delivery destination

Custom Particle Diameter

Alternative epoxy magnetic bead diameters may be discussed according to assay and automation requirements.

Custom Epoxy Density

Project-specific epoxy-group density or coupling-capacity targets may be evaluated.

Custom Magnetic Response

Magnetic material content and separation performance may be optimized according to technical feasibility.

Custom Solids Concentration

Alternative solids concentrations may be discussed for reagent formulation and automated dispensing.

Custom Buffer and Preservative

Customer-specific buffer, surfactant, stabilizer, and preservative systems may be evaluated through compatibility and stability testing.

OEM and Private-Label Supply

Cooperation options may include:

• OEM manufacturing

• Private-label packaging

• Customer-specific catalog numbers

• Customer-specific labels

• Bulk raw material supply

• Customized technical documents

• Customer-specific release specifications

Handling and Storage Recommendations

Follow the final product label, technical data sheet, and lot-specific Certificate of Analysis.

General recommendations include:

• Store under the specified refrigerated conditions.

• Do not freeze unless freeze–thaw stability has been validated.

• Keep the container tightly closed.

• Store the vial upright.

• Mix thoroughly before sampling.

• Protect the suspension from contamination.

• Use clean pipette tips and low-binding tubes.

• Do not allow the magnetic beads to dry.

• Avoid repeated unnecessary temperature changes.

• Do not return diluted or used material to the original container.

• Record the product lot number and opening date.

Resuspension

Magnetic beads may settle during storage.

Before use:

1. Allow the vial to reach the recommended handling temperature.

2. Gently invert the vial.

3. Apply controlled vortexing when necessary.

4. Confirm that the suspension is homogeneous.

5. Mix immediately before sampling.

6. Inspect for irreversible aggregates.

Avoid Drying

Do not allow the bead pellet to dry during magnetic washing.

Drying may cause:

• Irreversible aggregation

• Difficult redispersion

• Reduced coupling activity

• Increased non-specific binding

• Poor automation performance

Avoid Freezing

Freezing may cause:

• Particle aggregation

• Changes in surface activity

• Reduced magnetic recovery

• Poor redispersion

• Increased assay variation

Protect Reactive Beads from Competing Reagents

Before ligand coupling, avoid unnecessary exposure to buffers or additives containing reactive amines, thiols, or other nucleophiles that may consume epoxy groups.

Troubleshooting Guide

Low Antibody Coupling

Possible causes:

• Low epoxy-group activity

• Incompatible coupling buffer

• Competing amines in the buffer

• Insufficient antibody concentration

• Short coupling time

• Inadequate mixing

• Protein aggregation

• Poorly accessible reactive groups

Recommended actions:

• Use an amine-free coupling buffer.

• Verify antibody quality.

• Increase ligand concentration gradually.

• Extend coupling time.

• Maintain uniform bead suspension.

• Compare alternative pH and salt conditions.

• Test a model ligand.

Low Antibody Activity After Coupling

Possible causes:

• Random orientation

• Excessive surface loading

• Harsh pH

• High temperature

• Long incubation

• Antibody aggregation

• Binding-site modification

Recommended actions:

• Reduce ligand loading.

• Use milder coupling conditions.

• Evaluate a spacer.

• Investigate thiol-directed coupling.

• Compare functional activity, not only protein uptake.

High Background Chemiluminescence

Possible causes:

• Incomplete quenching

• Inadequate blocking

• Excess detection antibody

• Insufficient magnetic washing

• Non-specific sample adsorption

• Bead aggregation

• Incompatible wash buffer

Recommended actions:

• Optimize the quenching step.

• Compare multiple blockers.

• Titrate the detection antibody.

• Increase or improve magnetic washing.

• Optimize detergent and salt levels.

• Evaluate sample dilution.

Slow Magnetic Separation

Possible causes:

• Weak magnet

• Excessive liquid volume

• High sample viscosity

• Low magnetic content

• Incorrect vessel geometry

• Excessive bead aggregation

• Magnet positioned too far from the sample

Recommended actions:

• Use a stronger or optimized magnet.

• Reduce liquid height.

• Extend separation time.

• Evaluate sample viscosity.

• Validate the magnetic separator with MEP1UM-10.

Poor Bead Redispersion

Possible causes:

• Bead pellet drying

• Excessive magnetic capture time

• Incompatible buffer

• Insufficient surfactant

• Protein-mediated aggregation

• Excessive antibody loading

Recommended actions:

• Do not allow the pellet to dry.

• Reduce unnecessary magnet exposure.

• Optimize the formulation.

• Use controlled mixing.

• Reduce ligand loading when appropriate.

High Lot-to-Lot Variation

Possible causes:

• Variable bead quantity

• Variable ligand quality

• Inconsistent pH

• Inconsistent salt concentration

• Different coupling times

• Inconsistent quenching

• Different wash efficiency

• Inconsistent magnetic separation

Recommended actions:

• Standardize all raw materials and process steps.

• Record critical process parameters.

• Use acceptance limits for coupling efficiency and functional performance.

• Compare lots using the same CLIA model assay.

Frequently Asked Questions

What is MEP1UM-10?

MEP1UM-10 is a 1µm epoxy-functional magnetic bead suspension supplied at 5% solids for covalent antibody, protein, peptide, antigen, and enzyme immobilization.

What is the SHBC brand?

SHBC is the microsphere and biotechnology material brand of Shanghai SanYu Biotechnology Co., Ltd.

What is the nominal particle diameter?

The nominal particle diameter is 1µm.

The measured diameter and particle-size distribution should be confirmed using lot-specific documentation.

What is the solids content?

MEP1UM-10 is supplied at 5% solids.

Which functional group is present on the bead surface?

The bead surface contains epoxy functional groups.

Which biomolecules can be coupled?

Potential coupling targets include antibodies, antigens, proteins, peptides, enzymes, lectins, haptens, and amino- or thiol-modified molecules.

Is EDC/NHS activation required?

A separate EDC/NHS activation step is normally not required because the bead surface is already epoxy functionalized.

Which ligand groups react with epoxy?

Primary amino and sulfhydryl groups are commonly used for epoxy coupling. Selected hydroxyl-containing molecules may also be evaluated under suitable conditions.

Can MEP1UM-10 be used for chemiluminescent immunoassays?

Yes. It is designed for evaluation as a magnetic solid phase in chemiluminescent immunoassay and chemiluminescent enzyme immunoassay development.

Can it be used on automated analyzers?

It may be evaluated on automated magnetic immunoassay platforms.

Magnetic response, bead dispensing, resuspension, washing, carryover, and cuvette compatibility must be validated on the intended analyzer.

Is MEP1UM-10 suitable for sandwich immunoassays?

Yes. A capture antibody can be covalently immobilized on the beads, followed by target capture and detection using a labeled secondary antibody.

Can antigens be coupled to the beads?

Yes. Proteins, recombinant antigens, peptides, and suitable haptens may be evaluated for epoxy coupling.

Can enzymes be immobilized?

Yes. Functional enzymes may be coupled, but enzyme activity must be evaluated before and after immobilization.

Is blocking required after coupling?

A quenching and blocking step is generally recommended for assay development.

The final blocker should be selected according to the ligand, sample matrix, detection reagent, and background requirements.

What is the antibody-coupling capacity?

Coupling capacity should be confirmed using the final product specification or lot-specific Certificate of Analysis.

It should not be estimated from solids content alone.

How can coupling efficiency be measured?

Possible methods include protein mass balance, fluorescently labeled ligands, surface-reactive-group assays, and functional target-binding tests.

Why is functional testing important?

A high protein-uptake value does not guarantee that the immobilized antibody retains high antigen-binding activity.

How are the beads separated?

Use an external magnetic separator compatible with the tube, reaction vessel, sample volume, and bead concentration.

How long does magnetic separation take?

The required time depends on magnetic content, magnet strength, bead concentration, liquid height, sample viscosity, and vessel geometry.

Use the lot-specific magnetic-response data and validate the intended process.

Can MEP1UM-10 be frozen?

Freezing is generally not recommended unless freeze–thaw stability has been specifically validated.

How should the beads be stored?

Follow the product label, technical specification, and Certificate of Analysis. Refrigerated storage is generally used for magnetic bead suspensions unless otherwise specified.

Can the beads be allowed to dry?

No. Drying may cause irreversible aggregation and poor redispersion.

Can the particle size be customized?

Alternative epoxy magnetic bead sizes may be discussed according to technical feasibility and project requirements.

Can the epoxy density be customized?

Project-specific epoxy-group density or coupling-capacity targets may be evaluated.

Can the magnetic response be customized?

Magnetic content and separation performance may be discussed for qualified development projects.

Is bulk production available?

Yes. Shanghai SanYu Biotechnology Co., Ltd. supports samples, pilot batches, repeated orders, OEM projects, and enterprise bulk manufacturing.

What information is required for a quotation?

Please provide:

• Catalog number MEP1UM-10

• Required quantity

• Expected annual purchasing volume

• Preferred package size

• Intended CLIA or immunoassay application

• Type of ligand to be coupled

• Required coupling capacity

• Required magnetic separation time

• Automated analyzer model

• Buffer restrictions

• Preservative restrictions

• Quality-control requirements

• Documentation requirements

• Delivery destination

Request a Sample or Bulk Quotation

SHBC MEP1UM-10 1µm Epoxy Magnetic Beads provide a reactive magnetic solid phase for covalent immobilization of antibodies, antigens, proteins, peptides, enzymes, lectins, haptens, and other suitable biomolecules.

The product is suitable for:

• Chemiluminescent immunoassays

• Chemiluminescent enzyme immunoassays

• Magnetic sandwich immunoassays

• Competitive immunoassays

• Antibody immobilization

• Antigen immobilization

• Peptide and hapten coupling

• Enzyme immobilization

• Affinity capture

• Protein interaction research

• Automated magnetic washing

• Research reagent manufacturing

MEP1UM-10 provides:

• 1µm nominal particle diameter

• Epoxy-functional surface

• 5% solids suspension

• Direct covalent ligand coupling

• Magnetic separation capability

• Compatibility with antibody and protein immobilization

• Sample and pilot-batch supply

• Bulk manufacturing capability

• OEM and custom-development support

For sample evaluation or bulk purchasing, provide the intended application, ligand type, required coupling capacity, magnetic separation requirements, analyzer platform, annual demand, packaging format, and quality-control specifications.

Product Name: 1µm Epoxy Magnetic Beads
Catalog Number: MEP1UM-10
Brand: SHBC
Manufacturer: Shanghai SanYu Biotechnology Co., Ltd.
Nominal Particle Diameter: 1µm
Surface Functionality: Epoxy
Solids Content: 5%
Primary Application: Chemiluminescent Immunoassay Development
Supply Capability: Samples, Pilot Batches, and Bulk Production
Intended Use: Research Use Only. Not for diagnostic or therapeutic use.