Capillary zone electrophoresis method for the direct determination of amino acids in recombinant human erythropoietin preparations used for the treatment of anemia. Issue 9 (22nd April 2015)

• Record Type: Journal Article
• Authors: de Souza Crespo, Izabel Cristina; de Resende, Matheus Troina; Pereira Netto, Annibal Duarte; de Carvalho Marques, Flávia Ferreira
• Other Names: Lapizco‐Encinas Blanca H. guestEditor.; Hayes Mark A. guestEditor.
• Is Part Of: Electrophoresis. Volume 36:Issue 9/10(2015)
• Page Start: 1179
• Page End: 1185
• Publication Date: 2015-04-22
• Subjects: Amino acids -- Anemia -- CZE -- Excipients -- Recombinant human erythropoietin; Electrophoresis -- Periodicals; Electrophoresis -- Periodicals; 541.372
• DOI: 10.1002/elps.201400534
• Languages: English
• ISSNs: 0173-0835

Abstract

Abstract : A method based on CZE for the determination of glutamic acid, glycine, and alanine in a biopharmaceutical formulation containing recombinant human erythropoietin was developed. The separation was achieved within less than 5 min, using a fused‐silica capillary column (55 cm × 50 μm id) and 30 mmol/L phosphate buffer at pH 11.5, containing 0.6 mmol/L CTAB and 10% v/v methanol, as BGE solution. Applied potential of –25 kV, temperature of 15°C and hydrodynamic injection time of 15 s, at 50 mbar, were employed. The detection of the analytes was carried out without any derivatization reaction, at 220 nm using an UV‐DAD detector. Linear ranges from 50 to 2500 mg/L and quantification limits of 40, 39, and 37 mg/L were obtained for glutamic acid, glycine, and alanine, respectively. Sample preparation required only a dilution step. Considering peak area and migration time values, the method presented good repeatability (RSD <1.7%; n = 9) and intermediate precision (RSD <1.0%; n = 6). Recovery evaluation using a commercial sample led to values between 97.5 ± 5.2% and 101.5 ± 4.6%, demonstrating the feasibility of the method, which was successfully applied in the quantification of the amino acids of interest in biopharmaceutical samples.