Creative Diagnostics offers Single-domain Antibodies (small, stable, antibody fragments with superior tissue penetration and capacity to bind hidden or complex epitopes). They are derived from camelid heavy-chain antibodies, offering high specificity and affinity with robust stability in harsh environments. Using advanced antigen design and optimized screening, we ensure single-domain antibodies that reliably recognize native protein conformations with low background. Ideal for diagnostics, imaging, and biosensing, our Single-domain Antibodies deliver sensitive and accurate detection of challenging targets across research and clinical applications.
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What is Single-domain Antibody?
A Single-domain Antibody (sdAb), also called nanobody, is a natural single monomeric variable antibody domain found in heavy-chain-only antibodies isolated from camelids (llama, alpaca). A single-domain antibody is structurally different from conventional antibodies, which are heterodimeric in nature containing two heavy and two light chains. These antibodies have an advantage of small size of about 12–15 kDa.
Single-domain antibodies (sdAbs) are highly specific and retain high affinity to their target antigen. They can bind to hidden or cryptic epitopes that are inaccessible to conventional antibodies. They are extremely stable against chemical and thermal denaturation. They can also be easily expressed recombinantly, because of their small size and simple structure. All of these features make them attractive for use in diagnostics, therapeutics, and research applications, such as molecular imaging, drug targeting, and biosensing, among others, in a cost-effective and easily scalable manner.
Applications of Single-domain Antibody
- Targeted therapeutics for cancer and infectious diseases
- Diagnostic imaging and biosensors due to high specificity
- Research tools for detecting and modulating proteins
- Drug delivery as targeting ligands
- Neutralizing toxins and viruses
- Engineering bispecific or multispecific antibodies
Why Choose Creative Diagnostics' Single-domain Antibody Production Services?
Cytiva ÄKTA Pure 25 / ÄKTA Go
Sartorius Octet RED96e (BLI)
Creative Diagnostics supports all stages of development for high-affinity, high-specificity single-domain antibodies, for both research and diagnostic or therapeutic applications. Our experience in immunology and protein engineering allows us to provide customer with a development plan to address the unique challenges involved with producing stable and functional single-domain antibodies. Our platform for producing single-domain antibodies is based on an optimized antigen design strategy, effective immunization, and screening and validation methods that provide reliable, high-performance single-domain antibodies with superior specificity and consistency. We provide:
- Single domain antibodies that can effectively recognize small molecules and hidden epitopes are suitable for complex targets that are difficult for traditional antibodies to recognize.
- Single domain antibodies with excellent thermal and chemical stability can maintain activity under harsh conditions.
- Single domain antibodies with strong tissue penetration are suitable for targets such as tumors, viruses and nervous systems.
- Full-process customized development services, covering immunization animal selection, library construction, screening, optimization and expression.
- A variety of expression systems, such as E. coli, yeast and mammalian cells, to meet different experimental needs.
- High-throughput screening platform, combined with phage display, ELISA and BLI technologies, to quickly obtain high-affinity antibodies.
- Single domain antibody products suitable for multiple fields, supporting applications such as diagnosis, imaging, treatment and research.
- One-to-one technical support and flexible services to ensure the delivery of high-quality and reproducible antibody results.
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Our Services
The demand for high-affinity and highly specific antibody reagents and solutions is on the rise and our Single-domain Antibody Production Services are set up to take full advantage of the unique properties offered by single-domain antibodies. Their small size, stability and ability to bind to hidden or recessed epitopes make them the ideal choice for most difficult targets and complex biological matrices. Based on an efficient antigen design strategy as well as a highly optimized camelid hosts and high-throughput screening capabilities, which together guarantee the production of high quality and high performance antibodies. Every step of the process from antigen preparation, through immunization monitoring and final clone selection is tailored to provide the highest possible yield, affinity and specificity. The resulting antibodies are ideally suited for therapeutic candidate discovery, biomarker validation, molecular imaging and diagnostic assay development. The service is supported by a full quality system and is backed by a technical team with in depth expertise and an extensive track record that can consistently deliver single domain antibodies with high reproducibility, stability and function. Our core services include:
Antigen Design and Preparation
- Provide antigens in various forms (peptides, recombinant proteins, modified antigens)
- Combining the target epitope structure to optimize antigen conformation and immunogenicity
- Can provide antigen modification services such as carrier coupling and tag fusion
Immunization Animal Selection and Immunization Strategy Formulation
- Use alpacas (Llama) or camels (Camel) for immunization
- Design personalized immunization plans (injection dose, interval, adjuvant use)
- Real-time monitoring of immune effects, evaluation of antibody titers by ELISA and other methods
- Extract PBMC from the peripheral blood of immunized animals
- Perform VHH gene amplification and cloning, construction of high-quality phage display library
High-Throughput Screening and Positive Clone Identification
- Use phage display technology for affinity screening (panning)
- Identify positive clones through multiple platforms such as ELISA, BLI, FACS
- Provide affinity ranking, cross-reaction testing, epitope analysis and other services
Positive Clone Sequencing and Expression Vector Construction
- Full-length sequence determination of positive clones obtained by screening
- Provide fusion tag design (such as His-tag, Fc-fusion, fluorescent tags, etc.)
- Construct recombinant vectors suitable for a variety of expression systems
Recombinant Expression and Purification
- Provide expression systems such as E. coli, yeast, and mammalian cells
- Perform large-scale expression and purification (such as Ni-NTA affinity purification)
- Provide quality inspection reports such as SDS-PAGE, Western blot, and SEC
Functional Verification and Customized Application Development
- Provide affinity determination (KD value), binding kinetics analysis, competition experiments, etc.
- Can be further developed into diagnostic reagents, imaging probes, drug carriers and other product forms
- Provide additional experimental services such as stability testing and tissue penetration evaluation
Customized Support and Delivery
- Provide intermediate data updates and multiple rounds of screening optimization options
- Provide post-processing services such as freeze-drying and buffer optimization
- The final delivery includes antibody solution, expression plasmid, sequencing data and complete technical report
Single-domain Antibody Production Services Process
Evaluate antigen characteristics and determine antibody development strategies.
Immunize in animals such as alpacas and monitor antibody response levels.
Isolate immune cells and construct VHH phage display libraries.
Screen high-affinity antibodies and verify binding activity and specificity.
Recombinantly express and purify antibodies, and provide complete quality control and technical support.
Case Study
In this case, in order to verify the affinity of the developed single-domain antibody, Creative Diagnostics used BLI (Bio-Layer Interferometry) technology for binding kinetics testing. The figure below shows a typical BLI sensogram, where the horizontal axis is time (seconds) and the vertical axis is the binding response signal (nm offset). The blue curve intuitively shows the antibody's quick elevation in the binding phase and slow decay in the dissociation phase, and the gray dotted line in the middle represents the demarcation between the two phases. The "fast binding, slow dissociation" property indicates that the antibody has high affinity and good stability to the target antigen.
FAQs About Single-domain Antibody Production Services
What are the significant advantages of single-domain antibodies over traditional antibodies?
Single-domain antibodies are small in size and simple in structure. They not only have strong penetration, but also can bind to hidden epitopes that are difficult for traditional antibodies to recognize. They are also thermally stable and suitable for a variety of extreme experimental environments.
From which animals do you prepare your single-domain antibodies?
We mainly use alpacas (or camels) for immunization. These animals can produce natural heavy chain antibodies (VHH) and are an ideal source of single-domain antibodies.
If I only have a short peptide antigen, can I also make a single-domain antibody?
Yes. We can enhance immunogenicity by coupling carriers or designing special immunization strategies. Even small molecules or short peptides can successfully develop high-quality single-domain antibodies.
What deliverables can I get after antibody screening?
You will receive expression plasmids, purified antibody proteins, sequencing data, affinity test reports, and complete experimental process documentation to ensure reusability and subsequent development.
What applications are single-domain antibodies suitable for?
Very wide range of uses! Including therapeutic antibody screening, targeted drug delivery, in vivo imaging, immunodiagnosis, tissue staining, and even the construction of bispecific antibodies or CAR-T systems.
Start Your Custom Single-domain Antibody Production Services Project Today
To use our single-domain antibody production services, please contact Creative Diagnostics, your expert immunology service provider. From research-scale single-domain antibody production to industrial scale-up, our team is ready to support your R&D innovation.
