Figure 3. Ultraviolet–visible spectroscopy results of biosynthesis of AgNPs using leaf extracts of five Amaranthus species.
(A) shows the change in color of AgNO 3 from colorless to brown after addition of leaf extracts. (B) the UV/vis spectrum for: (1) B-AgNPs, (2) G-AgNPs, (3) D-AgNPs, (4) L-AgNPs (4), and (5) V-AgNPs.