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Malyhon

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After reaction with NHS-PEG-MAL, the peak area at the binding energy of
286.4 eV increases (Figure 1c and Table 2), and a new peak at the
binding energy of 532.7 eV appears (Figure 2c and Table 2) because
the introduced PEG chains contain abundant C-O bonds. In the
C1s spectrum, the peak area at the binding energy of 286.4 eV keeps
increasing after the covalent binding of RGD-containing peptides
because of the contribution of C-N and C-O bonds in the
peptides (Figure 1d and Table 2). In the O1s spectrum, the peak
areas at the binding energy of 531.3 eV increase significantly
(Figure 2d and Table 2) because the grafted RGD-containing
peptides contain abundant N-CdO bonds. Taken together, XPS
results of different PHBV films indicate the successful binding of
RGD-containing peptides to ammonia plasma-treated PHBV surfaces
through the cross-linker of bifunctional PEG.
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