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- W2029339919 abstract "Human erythropoietin (EPO) is an endogenously produced glycoprotein, which plays a key role in the erythropoiesis process. Production of erythropoietin by recombinant DNA techniques has made possible its therapeutical use besides its misuse in sport competitions. The link between glycosylated form and protein activity makes necessary a method to analyze the glycoforms' distribution in the recombinant products. In this work, a capillary isoelectric focusing (cIEF) method is presented that allows the analysis of erythropoietin glycoforms. Besides, the cIEF method can be easily implemented in different laboratories. In order to get a feasible and precise cIEF method the following factors have been studied and optimized: (i) neutral coated capillaries, 27 cm long are employed, (ii) ampholytes in the pH range 2 to 10 are used, (iii) bovine beta-lactoglobulin A is chosen as internal standard, (iv) anolyte consisting of 91 mM H3PO4 in cIEF gel is made by weight and catholyte is prepared by titrating 20 mM NaOH with H3PO4 to pH 11.85-11.90, (v) sample is completely depleted of excipients and sodium chloride 10 mM final concentration is added, and (v) t(n)/t(I.S.) and (A(n) - A(I.S.))/A(I.S.), n being the recombinant EPO glycoform considered and I.S. the internal standard, are chosen as indexes to express migration time and area. As a result, a precise method to analyze erythropoietin by capillary isoelectric focusing is achieved with intra-assay RSD < or = 0.5% for index time and < or = 1.5% for index area and inter-sample, inter-anolyte, and inter-catholyte precision better than 3.4% for index time and RSD lower than 2.2% for index area." @default.
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- W2029339919 date "2002-08-01" @default.
- W2029339919 modified "2023-10-10" @default.
- W2029339919 title "Improved capillary isoelectric focusing method for recombinant erythropoietin analysis" @default.
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- W2029339919 doi "https://doi.org/10.1016/s0021-9673(02)00783-5" @default.
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