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(a) UV-Visible spectrum of AuNP synthesized with a fixed concentration of Desmarestia antarctica (DA) and different concentrations of HAuCl4. (b–e) UV-Visible spectra of the synthesis of AgNP with different concentrations of DA extract and AgNO3. The final optimal reaction conditions are shown in Table 1, while Figure 2a,b show the corresponding UV-Vis spectra.
