Chapter title |
Capillary Electrophoresis Method for the Assessment of Erythropoiesis-Stimulating Agents in Final Formulations
|
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Chapter number | 13 |
Book title |
Capillary Electrophoresis of Proteins and Peptides
|
Published in |
Methods in molecular biology, January 2016
|
DOI | 10.1007/978-1-4939-4014-1_13 |
Pubmed ID | |
Book ISBNs |
978-1-4939-4012-7, 978-1-4939-4014-1
|
Authors |
Michel Girard, Anita Kane, Sylvie Boucher |
Abstract |
Capillary electrophoresis (CE) comprises several separation modes that can be used to characterize proteins in terms of physico-chemical properties such as isoelectric point or molecular weight, or in terms of purity/heterogeneity for the presence of charge or size variants. In glycoproteins the heterogeneity occurring as a consequence of variable amounts of terminal sialic acid residues on glycan moieties can be detected by CE. As such, a capillary zone electrophoresis (CZE) method was found suitable for the detection of isoforms of several erythropoiesis-stimulating agents (Bietlot and Girard, J Chromatogr A 759:177-184, 1997; Boucher et al., J Pharm Biomed Anal 71:207-213, 2012). In particular, the method can be used to analyze finished products containing erythropoietin-α, erythropoietin-β, or darbepoetin-α regardless of the formulation and without the need for sample pretreatment. The major excipients encountered in the various formulations included polysorbate 80, polysorbate 20, or human serum albumin. The ability of the method to resolve isoforms of the active ingredient in finished product enables the comparison of the isoform profile with that of the corresponding drug substance, allowing the assessment of the structural integrity and content of the active ingredients in finished products. |
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