Process for fractionating polyethylene glycol (PEG)-protein adducts and an adduct of PEG and granulocyte-macrophage colony stimulating factor
The invention relates to fractionating a mixture of polyethylene glycol (PEG)-protein adducts having different degrees of PEG substitution by partitioning the PEG-protein adducts in a PEG-containing aqueous biphasic system according to the degree of PEG substitution. A new PEG-gm-CSF obtained by the process is useful in pharmaceutical compositions for use in therapeutic or diagnostic methods.
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