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. 2019 Sep 18;24(18):3395. doi: 10.3390/molecules24183395

Figure 2.

Figure 2

Evolution of the UV-Vis absorption spectrum of the bovine serum albumin (BSA)/HAuCl4 system at different stages of incubation: (a) initial, (b) 3 days, (c) 1 week, (d) 2 weeks and (e) 3 weeks. Inset: Color change accompanying the formation of gold nanoparticles.