VHH antibodies, derived from Camelids (Camels, Llamas, Alpacas) and Sharks, consist solely of heavy chains and represent the smallest functional antibody fragments currently known, with a size of only 12-15 kDa. The camelid immune system is unique. Nn addition to conventional antibodies, their serum contains antibodies naturally lacking light chains, making them an ideal source for obtaining VHH antibodies. VHHs are characterized by their small size, excellent water solubility, stability, acid resistance, low immunogenicity, and ability to bind unique epitopes. They clear rapidly from the bloodstream and penetrate tissues effectively. These distinctive properties enable their widespread application in biosensing, affinity capture, molecular imaging, and disease diagnosis and therapy. VHHs are typically sourced from immune or naive libraries and selected using phage or yeast display technologies. Phage Display is the most common technique, enabling the production of specific VHH antibodies through appropriate screening strategies. Furthermore, VHHs are amenable to large-scale production in E. coli and exhibit unique antigen-binding characteristics compared to other recombinant antibodies.

KMD Bioscience is dedicated to providing clients with VHH Library Construction Services targeting diverse antigens. Leveraging our platform advantages, we deliver VHH Phage Display Libraries with a capacity of 1 × 10⁹ clones. Drawing on extensive experience in recombinant antibody library generation and screening, we expertly provide various VHH Antibody Library Services—including naive, immune, and synthetic libraries—to identify the ideal VHH antibody for each client. Our Phage Antibody Library Construction Platform utilizes diverse phages such as M13, T4, T7, and λ to meet specific client requirements. The VHH libraries we construct feature immense size and rich diversity, enabling the generation of high-affinity VHH antibodies. We offer Personalized Library Construction Services tailored to client needs. We provide multiple phagemid vectors, including pMECS, pComb3X, and pCANTAB 5E, and can modify them as required. We also supply various E. coli host strains for phage infection, such as TG1, XL1-Blue, and ER2738.

KMD Bioscience possesses advanced technology in recombinant antibody construction and screening, continuously optimizing our antibody library generation capabilities. We not only maintain naive antibody libraries but are also highly proficient in constructing VHH immune libraries, facilitating the generation of more diverse and higher-affinity antibodies. We immunize camelids like alpacas with prepared antigen, monitor antibody titers via ELISA until optimal levels are reached, collect peripheral blood to isolate PBMCs, extract total RNA, perform reverse transcription, amplify the VHH genes by PCR, and clone them into phage display vectors. Using electroporation, we generate vast VHH Antibody Libraries. Through screening and enrichment, we produce VHH antibodies that meet client requirements for research, diagnosis, or therapy. With years of experience in recombinant antibody expression and purification, we rigorously characterize and functionally validate all prepared VHH antibodies—using techniques like Western Blot, ELISA, Immunoprecipitation, Flow Cytometry, or Immunohistochemistry—before final delivery.