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Au@alendronate NPs characterization: (a) transmission electron microscopy (TEM) image (left) and size distribution (right), (b) UV–vis spectrum, (c) FTIR spectra of Au@alendronate NPs (red curve) versus alendronate (black) curve, (d) Hydrodynamic diameter distribution (in volume, left) and zeta potential (right) of Au@alendronate NPs.
