Figure 2

UV–Vis absorption spectra of the synthesized gold nanoformulations (a) AuNPs (λmax = 527 nm), (b) AuNPs-SH-PEG-NH2 (λmax = 528 nm), (c) Dtx (λmax = 231 nm), (d) FA (λmax = 277 and 344 nm), (e) AuNPs-PEG-FA (λmax = 277, 344 and 528 nm) and (f) AuNPs nanoformulations (λmax = 228, 277, 344 and 528 nm) and inset photographic image of gold nanoformulations at pH = 6.5.