Application of dye-ligands affinity adsorbent in capturing of rabbit immunoglobulin G

Reactive Green 5-Decorated Polyacrylamide/Chitosan Cryogel: An Affinity Matrix for Catalase

Acrylamide/chitosan-based cryogel was fabricated, and a triazine dye, Reactive Green 5, was attached to the cryogel by nucleophilic substitution to build a dye affinity support for adsorption of catalase enzyme. Characterization of cryogel was performed using FTIR, SEM, EDX, BET, and swelling test. Synthesized cryogel beared pores with ~ 200 μm in size and the surface area of 11.8 m²/g. Maximum catalase adsorption was (17.6 ± 0.29 mg/g) measured at pH 4.0 and 25 °C. The adsorption sites on the cryogel were saturated at 0.75 mg/mL enzyme concentration. Increased ionic strength caused a decrease in adsorption capacity. Desorption of catalase from cryogel was enabled using 0.5 M NaSCN solution. Consecutive adsorption experiments were carried out fifteen times to evaluate the reusability of the cryogel. Thermal, storage, and operational stabilities of immobilized catalase were higher than the free one. The data produced implicate that catalase-adsorbed dye-affinity cryogel may be used for H₂O₂ detection or removal when necessary. Graphical Abstract.

Development of novel small peptide ligands for antibody purification

Small peptide ligands which were designed based on the interactions with human immunoglobulin G (IgG) using the molecular simulations, can offer a potential alternative for mAb purification with elution condition at pH 9 and pH 3.

Affinity chromatography as a tool for antibody purification

The global antibody market has grown exponentially due to increasing applications in research, diagnostics and therapy. Antibodies are present in complex matrices (e.g. serum, milk, egg yolk, fermentation broth or plant-derived extracts). This has led to the need for development of novel platforms for purification of large quantities of antibody with defined clinical and performance requirements. However, the choice of method is strictly limited by the manufacturing cost and the quality of the end product required. Affinity chromatography is one of the most extensively used methods for antibody purification, due to its high selectivity and rapidity. Its effectiveness is largely based on the binding characteristics of the required antibody and the ligand used for antibody capture. The approaches used for antibody purification are critically examined with the aim of providing the reader with the principles and practical insights required to understand the intricacies of the procedures. Affinity support matrices and ligands for affinity chromatography are discussed, including their relevant underlying principles of use, their potential value and their performance in purifying different types of antibodies, along with a list of commercially available alternatives. Furthermore, the principal factors influencing purification procedures at various stages are highlighted. Practical considerations for development and/or optimizations of efficient antibody-purification protocols are suggested.