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The physical binding of VEGF onto BPNSs. (a) TEM images of BPNSs and VEGF-BPNSs. (b) Topography and surface element analysis demonstrated that VEGF can be physically adsorbed on the surface of BPNSs. (c) AFM images of BPNSs and VEGF-BPNSs, the height profile showed the increased thickness of VEGF-BPNSs. (d) Particle size distribution, (e) Average size and (f) Zeta potential of BPNSs and VEGF-BPNSs. *p < 0.05, **p < 0.01, ***p < 0.001.
