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. 2021 Dec 30;27(1):217. doi: 10.3390/molecules27010217

Figure 2.

Figure 2

UV-Vis absorption spectra of AgNPs colloidal solutions synthesized using Picea abies (A) and Pinus nigra (B) aqueous bark extracts (a: extract + 1 mM AgNO3 at time 0; b: extract + 1 mM AgNO3 at 60 min).