Figure 3
UV–vis spectra recorded as a function of reaction time of an aqueous solution of 1 mM HAuCl 4 with the filtrate of the fungal biomass. The spectra show a sharp absorption λmax 540 at 48 h reaction periods, which intensifying with the 72 h reaction time. The inset shows vials containing the filtrate of A. clavatus collected during the reaction period, rapid change in colour pattern due to SPR are clearly visible.