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. Author manuscript; available in PMC: 2016 Feb 11.
Published in final edited form as: Nano Lett. 2015 Jan 26;15(2):1403–1409. doi: 10.1021/nl504798g

Figure 2.

Figure 2

Physicochemical characterization of BM-AuNPs. (a) Hydrodynamic sizes (diameter, nm) and (b) surface zeta potentials (mV) of AuNPs before coating and after coating, in comparison with those of OMVs. (c) A representative TEM image showing the spherical core–shell structure of the BM-AuNPs negatively stained with uranyl acetate (scale bar, 50 nm). Inset: a zoomed-in view of a single BM-AuNP (scale bar, 10 nm). (d) Quantification of protein concentration of AuNPs before and after the membrane coating by using a BCA assay. Protein loading yield is defined as the weight ratio of immobilized proteins to the gold nanoparticles.