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. Author manuscript; available in PMC: 2013 Sep 10.
Published in final edited form as: Biomacromolecules. 2012 Aug 15;13(9):2945–2951. doi: 10.1021/bm300985r

Figure 2.

Figure 2

(a) 1H-NMR spectra of H2 and H5 peaks in PEG2kDa-PHis2.7kDa exposed at different pHs of phosphate buffer and (b) pH-dependent H2 peak’s integration of PEG2kDa-PHis with different MWs of PHis.