菜单
CRO Services
Drug Development Expertise Empowering Research Services for Biologics

SPR & BLI Binding Assays Services


High-Throughput, Real-Time Surface Plasmon Resonance (SPR) and Bio-Layer Interferometry (BLI) Services

 

Our binding assays services use surface plasmon resonance (SPR) and bio-layer interferometry (BLI) to deliver high-throughput analysis of biomolecular interactions. These SPR & BLI assays generate high-quality, real-time binding data, including association rate constant (ka), dissociation rate constant (kd), and equilibrium dissociation constant (KD), to support efficient target affinity characterization, binding kinetics analysis, koff ranking and screening, epitope binning analysis, dual binding for bispecific antibodies, and Fc receptor characterization.

 

Backed by high-throughput capacity, experience across 100,000+ interactions and 200+ targets, and extensive SPR & BLI assay development expertise, we deliver reliable SPR & BLI analysis services for therapeutic antibodies, ADCs, and other biologic modalities, supporting lead screening, characterization, and optimization throughout biologics drug discovery.

 

 

SPR & BLI binding assays services for real-time measurement of molecular interactions and binding kinetics.

Summary of BLI and SPR Services Capabilities

 

  Surface Plasmon Resonance (SPR) Bio-Layer Interferometry (BLI)
Instrument Biacore 8K/8K+, Biacore T200, and Carterra LSA Octet
Data Measurement Real-time
Detection Label Label-free
Sensitivity KD: pM to μM KD: nM to sub-μM
Molecular Type No specific limitation Molecules with Fc/His/biotin tag
Use scenarios
  • Biacore 8K/8K+: HTP screening, characterization, and broad applications
  • Biacore T200: For detailed SPR analysis
  • Carterra LSA: For large-scale antibody profiling, kinetics, and epitope binning
  • Octet: Fast turnaround and cost-effective for routine binding and concentration studies
Applications
  • Target affinity characterization
  • Fc receptor characterization
  • Koff ranking & screening
  • Epitope binning
  • Simultaneous binding
  • Target affinity characterization
  • Concentration determination
  • Additional studies as needed

 

 

Surface Plasmon Resonance (SPR) Assays

 

Surface plasmon resonance (SPR) binding assay is a label-free technology for real-time analysis of biomolecular interactions, supporting detailed binding affinity, binding kinetics, lead screening, and characterization across biologics discovery. As a highly sensitive assay platform, surface plasmon resonance measures refractive index changes at a metal film surface under total internal reflection conditions, enabling broad molecule compatibility and detection across pM to μM binding levels. Our SPR services generate high-quality interaction data for applications such as target affinity characterization, Fc receptor characterization, koff ranking and screening, epitope binning, and simultaneous binding studies. With 6 Biacore 8K/8K+, 3 Biacore T200, and 1 Carterra LSA, we support routine SPR analysis, high-throughput workflows, and fit-for-purpose SPR assay development.

 

 

SPR Binding Assays Service Details & Applications:

 

Binding Assay Dual Binding Assay Competition Assay Epitope Binning Assay Fc Receptor Binding Assay
  • Protein-protein/peptide/small molecule binding affinity
  • Bioactivity quality control for protein production
  • Koff ranking for lead optimization
  • HTP screening for lead identification
  • Simultaneous binding for bispecific antibodies & trispecific antibodies
  • Competition of multiple ligand binding assays against a single receptor
  • High-throughput pairwise binning
  • Full panel of Fc receptors binding for effector function assessment
  • Fc-engineered antibody characterization

 

Note: For the services above, we offer assay setup, single-concentration analysis, full kinetics measurement, and custom assay development.

 

 

 

Case Study #1: High-Throughput SPR Assays for Rapid Ranking and Screening of TCRs from Crude Supernatants

 

This case study highlights how high-throughput surface plasmon resonance service can support antibody humanization, PTM removal, and affinity maturation by ranking variants directly from crude supernatants. Using as little as 100 μL per crude sample, the workflow generates accurate affinity and kinetics data, enabling rapid lead identification and screening with distinct kinetics profiles. Strong correlation between crude and purified samples further demonstrates the robustness of our SPR services for early-stage screening.

 

Surface plasmon resonance analysis results showing high-throughput koff ranking from CHO supernatants and an iso-affinity chart used to differentiate TCRs by SPR binding kinetics.

 

Figure 1: These surface plasmon resonance analysis results demonstrate high-throughput screening for koff ranking and TCR clone differentiation from CHO culture, helping identify TCR variants with favorable affinity and kinetics early in discovery.

 

Case Study #2: High-Throughput Surface Plasmon Resonance Epitope Binning for Antibody Classification and Lead Differentiation

 

This case study demonstrates how high-throughput SPR analysis on the Carterra LSA supports 34 × 34 pairwise epitope binning to classify antibody binding at scale. Using premix competition assay design, the workflow generates SPR sensorgrams, competition matrix heat maps, and dendrogram-based blocking analysis to identify bins with antibody communities. These data help differentiate clones, define epitope coverage, and support lead selection for antibody discovery.

 

Surface plasmon resonance analysis epitope binning workflow using Carterra LSA, competition matrix heat map, dendrogram-based network blocking plot, and grouped antibody bins and communities from 34 × 34 pairwise binning.

 

Figure 2: Surface plasmon resonance assays for epitope binning via Carterra LSA enables high-throughput pairwise competition analysis, transforming sensorgram data into heat maps, and antibody binning networks to support clone differentiation and epitope characterization.

 

 

 

Case Study #3: SPR-Based Dual Binding Analysis for Bispecific Antibody Screening and Characterization

 

This case study demonstrates how surface plasmon resonance services support simultaneous binding analysis for bispecific antibodies by evaluating target engagement to a second antigen in the presence of the first. The workflow helps differentiate leads with strong or weak secondary binding, while also enabling KD determination under dual binding conditions. These surface plasmon resonance antibody affinity data support functional characterization of bispecific pairing across diverse formats and help identify leads with the desired binding profile for downstream development.

 

Surface plasmon resonance assay data showing simultaneous binding analysis and KD detection in the presence of a first antigen to characterize bispecific antibody binding to two targets.

 

Figure 3: SPR-based simultaneous binding analysis enables characterization of bispecific antibodies by measuring binding to Ag2 after engagement with Ag1, helping screening leads with different secondary binding strength and confirm dual target binding behavior.

 

Case Study #4: SPR Analysis of Fc Receptor Binding Assays for FcyRs, FcRn, and C1q

 

This case study demonstrates how an LC-MS/MS method can quantify total antibody concentration and average drug-to-antibody ratio (DAR) in biological matrix samples. The workflow integrates immunoprecipitation, protein precipitation, enzyme digestion, and payload release to measure total antibody, conjugated payload, and free payload content. The study highlights how Mass Spectrometry analysis supports robust ADC characterization and enables accurate PK assessment during therapeutic ADC discovery.

 

Surface plasmon resonance analysis of antibody binding to Fcγ receptors, FcRn, and C1q, with kinetic curves and affinity plots used to assess Fc receptor interactions and effector function properties.

 

Figure 4: SPR enables detailed Fc receptor characterization by measuring antibody binding to FcγRI, FcγRII, FcγRIII variants, FcRn, and C1q, generating binding kinetics data to support Fc engineering and effector function assessment.

 

 

Bio-Layer Interferometry (BLI) Assays

 

Bio-layer interferometry (BLI) binding assay is a label-free optical technology for real-time analysis of biomolecular interactions. By measuring shifts in reflected light at the biosensor surface, BLI analysis enables fast, real-time characterization of binding events across a wide range of biologic molecules. Our BLI analysis platform enables both standard measurement and custom BLI assay development, generating key binding kinetics data such as ka, kd, and KD to support target affinity characterization and concentration determination. These BLI services help accelerate lead screening, characterization, and optimization for antibodies, ADCs, and other biologics.

 

 

BLI Binding Assays Service Details & Applications:

 

Target Affinity Characterization Concentration Determination Other Testing
  • Protein-protein/peptide/small molecule binding affinity
  • Bioactivity quality control for protein production
  • Titer measurement
  • Screening
  • Complex binding
  • Additional studies as needed

 

Note: For the services above, we offer full kinetics measurement and custom assay development.

 

 

 

Case Study #5: Using Bio-Layer Interferometry (BLI) Assays for Real-Time, High-Throughput Titer Measurement

 

This case study highlights how bio-layer interferometry (BLI) services support real-time, label-free characterization of biomolecular interactions through optical signal shifts at the biosensor surface. In addition to binding kinetics, BLI assays can be applied to high-throughput titer measurement, enabling efficient screening and characterization to support biologics discovery workflows.

 

BLI binding assay signal processing, showing wavelength shifts, concentration-dependent binding response, and real-time sensorgrams for interaction analysis and titer measurement.

 

Figure 5: BLI analysis measures wavelength shifts caused by changes in optical thickness at the biosensor surface. The generated data support real-time interaction analysis, concentration-dependent response evaluation, and high-throughput titer measurement.

 

 

Your Project. Our Expertise.