Fig. 2

Characterization of the synthesized Ångstrom-scale gold particles with (AuÅPs-AL) or without (AuÅPs) alendronate loading. A ¹H-NMR spectra of free lipoic acid (top) and AL (bottom). B ¹H-NMR spectra of dialyzed AuÅPs (top) and AuÅPs-AL (bottom) in D₂O. C Photographs of the AuÅPs-AL solution under visible light and UV light. D Fluorescence excitation and emission spectra of AuÅPs-AL (680 nm). E DLS spectra of the as-prepared AuÅPs-AL (black line) and AuÅPs (red line). F and G TEM images and core size distribution of the synthesized AuÅPs and AuÅPs-AL, respectively