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Number distribution N (ζ) of the zeta-potential of (a) Au-PEG NPs, (b) Au-PEG-control NPs, (c) Au-PEG-anti-HRP* NPs, (d) Au-PEG-anti-VEGF* NPs, (e) Au-PEG-anti-HRP NPs, and (f) Au-PEG-anti-VEGF NPs. The concentration of the NP solutions were cNP ≈ 5 nM, and the measurements were performed in milliQ water. Each sample was measured at least three times and the mean value of the zeta-potential was determined.
