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Affinity Maturation Affinity Maturation

Affinity Maturation

Antibody Optimization
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Affinity maturation with our proprietary FCMES-AM™ platform delivers ≥5-fold improvement in just 2–3 months.

Biointron’s proprietary FCMES-AM™ (Full Coverage Mammalian Expression System for Affinity Maturation) platform delivers industry-leading antibody optimization by systematically improving binding affinity through non-biased site saturation mutagenesis across all CDR regions. Each amino acid position is replaced with 17 alternative residues (excluding cysteine and methionine) at equal probability, enabling full coverage without bias. Using mammalian cell expression systems and high-throughput screening, our platform ensures comprehensive analysis of potential variants. With this advanced approach, we guarantee at least a five-fold improvement in antibody affinity, making Biointron a trusted partner for researchers worldwide.

Our antibody optimization services also include:

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Affinity Maturation Overview

Advantages of our Affinity Maturation Service

Non-biased Site Saturation Mutagenesis

  • Full coverage (all CDR regions)
  • Same frequency of occurence for the other 17 amino acids

High Efficiency Screening

  • Guaranteed at least 5-Fold Improvement
  • Affinity ranking ELISA/SPR/FACS

Fast Turnaround

  • 6-8 Weeks
  • HTP Expression in Mammalian System
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Broad Applicability Across Antibody Formats

Our affinity maturation platform supports a wide range of antibody formats, including IgG and Fab fragments from mice and rabbits, as well as VHH antibodies from camelid and shark sources. The process involves site-directed saturation mutagenesis of CDR regions, identification of affinity-enhancing mutations, combinatorial library construction, and full biophysical evaluation. Deliverables include affinity-matured sequences, ≥1 mg of purified antibody, plasmids, and comprehensive affinity detection reports.

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Antibody Engineering with Rigorous Validation

At Biointron, affinity maturation is focused on reliably improving antibody binding affinity while preserving antigen specificity. Our workflow integrates ELISA-based affinity ranking with gold-standard analytical methods, including Surface Plasmon Resonance (SPR) and Flow Cytometry (FACS), to quantitatively confirm improvements in binding kinetics. This stepwise validation ensures that optimized antibodies demonstrate both enhanced affinity and consistent target recognition. With a standard project timeline of 2–3 months, Biointron provides an efficient and reproducible solution for advancing antibody candidates toward therapeutic or diagnostic applications.

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Affinity Maturation Workflow

Site-directed saturated mutation
Site-directed saturated mutation
High-throughput mammalian cell expression
High-throughput mammalian cell expression
ELISA and sequencing to identify hot spots
ELISA and sequencing to identify hot spots
Combinatorial mutation design
Combinatorial mutation design

Affinity Maturation Service Details

Milestone Service Description Deliverables
Sequence Design
  • No-bias Site Saturation Mutagenesis in CDR Region (all 17 amino acid variants for each amino acid in CDR region )
 /
Hot Spots Identification
  • High Throughput Expression in Mammalian System (FCMES-AM)
  • ELISA Detection
  • ELISA Results
Hot Spots Combination
  • High Throughput Expression in Mammalian System (FCMES-AM)
  • ELISA Detection
  • ELISA Detection
Antibody Expression & Affinity Detection
  • Antibody Expression & Affinity Purification
  • Affinity Detection by Biacore Full KD or FACS
  • Purified Antibody
  • Plasmid Sequencing Resultsy
  • Affinity Detection Results
  • Sequence Design
    Description
    • No-bias Site Saturation Mutagenesis in CDR Region (all 17 amino acid variants for each amino acid in CDR region )
  • Hot Spots Identification
    Description
    • High Throughput Expression in Mammalian System (FCMES-AM)
    • ELISA Detection
    Deliverables
    • ELISA Results
  • Hot Spots Combination
    Description
    • High Throughput Expression in Mammalian System (FCMES-AM)
    • ELISA Detection
    Deliverables
    • ELISA Detection
  • Antibody Expression & Affinity Detection
    Description
    • Antibody Expression & Affinity Purification
    • Affinity Detection by Biacore Full KD or FACS
    Deliverables
    • Purified Antibody
    • Plasmid Sequencing Resultsy
    • Affinity Detection Results

Case Study

Case 1:

The parental antibody is VHH, after affinity maturation, the affinity increases 23-fold, 19-fold and 6-fold separately.

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Koff of the VHH improves and the affinity increases 6-fold, 23-fold and 19-fold separately.

Case 2:

The parental antibody is mouse IgG, after affinity maturation, the affinity increases 120-fold, 48-fold and 46-fold separately.

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Affinity increases 120-fold, 48-fold and 46-fold separately.
“We have our own affinity maturation platform, called FCMES-AM. I believe this and the research my team is dedicated to developing, is what makes our service the best in the industry. With a guaranteed affinity improvement, you can trust we will get the job done.”
Sufeng Cai
Sufeng Cai
Affinity Maturation Team
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Affinity Maturation Service FAQs

Resources

Affinity Maturation Project Commitment

Project Commitment

You will have a dedicated project manager for each project when you work with us, guaranteeing efficient planning, clear communication, and a personalized approach with a strong focus on you. We aim to build trust in all our collaborations, with strong relationships with 2,500+ biotechnology and pharmaceutical companies.

Services & Products

HTP Recombinant
Antibody Production
Bispecific Antibody
Production
Large Scale Antibody
Production
Protein Expression In
Mammalian system
Single B Cell Screening
(Antibody Discovery)
ADC High-throughput
Antibody Conjugation
VHH Antibody
Discovery
Antibody
Humanization
Affinity
Maturation
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