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. 2013 Nov 4;8(11):e80109. doi: 10.1371/journal.pone.0080109

Figure 3. The purity of rhG-CSF is increased following refolding from inclusion bodies.

Figure 3

Insoluble fraction of the induced culture were harvested, refolded, and precipitated under the stepwise decrease of pH (7.5→5.5). The refolded samples before and after pH precipitation process were analyzed by reducing 4-12% SDS-PAGE, followed by Coomassie brilliant blue staining. Lane 1, solubilized IBs; lane 2, refolded IBs before pH precipitation; lane 3, supernatant (Sup) after pH 7.5 precipitation; lane 4, sup after pH 6.5 precipitation; Lane 5, sup after pH 5.5 precipitation. The arrow indicates rhG-CSF.