Green Synthesis and Antimicrobial Activities of Silver Nanoparticles Using from Ie Seu-Um Geothermal Area, Aceh Province, Indonesia.

Herein, we report our success synthesizing silver nanoparticles (AgNPs) using aqueous extracts from the leaves and flowers of growing in the geothermal manifestation Ie Seu-Um, Aceh Besar, Indonesia. aqueous extract can be used as a bio-reductant for Ag→Ag conversion, obtained by 48h incubation of Ag, and the extract mixture in a dark condition. UV-Vis characterization showed that the surface plasmon resonance (SPR) peaks of AgNPs-leaf (AgNPs-LCg) and AgNPs-flower (AgNPs-FCg) appeared in the wavelength range of 410-460 nm. Scanning electron microscopy energy-dispersive X-ray spectrometry (SEM-EDS) revealed the agglomeration and spherical shapes of AgNPs-LCg and AgNPs-FCg with diameters ranging from 87.85 to 256.7 nm. Zeta potentials were observed in the range of -41.8 to -25.1 mV. The Kirby-Bauer disc diffusion assay revealed AgNPs-FCg as the most potent antimicrobial agent with inhibition zones of 12.05 ± 0.58, 11.29 ± 0.45, and 9.02 ± 0.10 mm for , , and , respectively. In conclusion, aqueous extract from the leaves or flowers of may be used in the green synthesis of AgNPs with broad-spectrum antimicrobial activities.