Abstract
A novel methoxypolyethylene glycol (mPEG) derivative, containing a reactive group of 1-methyl pyridinium toluene-4-sulfonate, was synthesized and characterized. The mPEG derivative was successfully conjugated with two proteins: recombinant human granulocyte-colony stimulating factor (rhG-CSF) and consensus interferon (C-IFN). Homogeneous mono-PEGylated proteins were obtained which were identified by high performance size-exclusion chromatography and MALDI-TOF mass spectrometry. The biological activities of the mono-PEGylated rhG-CSF and the mono-PEGylated C-IFN were maintained at 90% and 88%, respectively.
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