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This paper presents a case study of using a multicompartment isoelectric focusing apparatus to determine the isoelectric points and focus preparative quantities of brain derived neurotrophic factor (BDNF) and neurotrophic factor 3 (NT3). A separation of PEGylated from unPEGylated forms of granulocyte colony stimulating factor (G-CSF) is described as well. Both BDNF and NT3 have substantially higher pI values in this system than is predicted from sequenced based modeling. Although PEGylated forms of G-CSF can be separated from the unPEGylated forms, separation of protein with differing degrees of PEGylation was not achieved. The paper additionally demonstrates that this technique can be used simultaneously as an analytical and preparative tool, eliminating the need for analytical IEF gels.
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