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. 2021 Mar 25;19:84. doi: 10.1186/s12951-021-00836-1

Fig. 1.

Fig. 1

Optimization of almond seed coat extract mediated biogenic synthesis of AuNPs. a Color change of initial biogenic synthesis reaction, and UV–Vis absorption spectra showing the effects of b incubation time, c incubation temperature, d pH, e concentration of HAuCl4 and f ratio of extract:precursor on biogenic synthesis of AuNPs