title: Rapid analysis of charge variants of monoclonal antibodies using non-linear salt gradient in cation-exchange high performance liquid chromatography.
abstract: A method is proposed for rapid development of a short, analytical cation exchange high performance liquid chromatography method for analysis of charge heterogeneity in monoclonal antibody products. The parameters investigated and optimized include pH, shape of elution gradient and length of the column. It is found that the most important parameter for development of a shorter method is the choice of the shape of elution gradient. In this paper, we propose a step by step approach to develop a non-linear sigmoidal shape gradient for analysis of charge heterogeneity for two different monoclonal antibody products. The use of this gradient not only decreases the run time of the method to 4min against the conventional method that takes more than 40min but also the resolution is retained. Superiority of the phosphate gradient over sodium chloride gradient for elution of mAbs is also observed. The method has been successfully evaluated for specificity, sensitivity, linearity, limit of detection, and limit of quantification. Application of this method as a potential at-line process analytical technology tool has been suggested.
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India.
authors.forename: Varsha
authors.initials: V
authors.lastname: Joshi
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India.
authors.forename: Vijesh
authors.initials: V
authors.lastname: Kumar
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India. Electronic address: asrathore@biotechcmz.com.
authors.forename: Anurag S
authors.initials: AS
authors.lastname: Rathore
mesh_terms: D000911:Antibodies, Monoclonal / Q000032:analysis* / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D057230:Limit of Detection; D010710:Phosphates / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry
chemical_list: D000911:Antibodies, Monoclonal; D002412:Cations; D010710:Phosphates; D012965:Sodium Chloride
keywords: CE–HPLC; Concave gradient; Convex gradient; PAT; Sigmoidal gradient; mAb