The formation of AgNPs was observed through the color change of
Equisetum extracts after being mixed with AgNO
3. The UV-Vis spectra were recorded in the 300–600 nm range to distinguish the maximum surface plasmon resonance (SPR), using a Jasco
V-530 UV-Vis double beam spectrophotometer for this determination. The FTIR spectra were obtained with a Bruker
Vertex 70 spectrophotometer, by potassium bromide tableting, over a scan interval of 4000–310 cm
−1. The EDX qualitative analysis was performed using a Quanta 200 Environmental Scanning Electron Microscope (ESEM) with EDX. The used EDX detector allowed rapid determination of the elementary composition of nanoparticles. The DLS measurements were performed using a Delsa Nano Submicron Particle Size Analyzer (Beckman Colter) that provided the average diameter of nanoparticles and the Zeta potential value. Additionally, TEM analysis was performed using a Hitachi
High-Tech HT 7700 Transmission Electron Microscope.
Moreover, prior to the purification and characterization of AgNPs, the supernatant and the initial plant extract were analyzed taking into account the phenolic content using the modified spectrophotometric Folin-Ciocâlteu method [26 (
link)]. Gallic acid was used as the standard and the results were expressed in mg gallic acid equivalents (GAE)/mL sample.
Batir-Marin D., Mircea C., Boev M., Burlec A.F., Corciova A., Fifere A., Iacobescu A., Cioanca O., Verestiuc L, & Hancianu M. (2021). In Vitro Antioxidant, Antitumor and Photocatalytic Activities of Silver Nanoparticles Synthesized Using Equisetum Species: A Green Approach. Molecules, 26(23), 7325.