Instant green synthesis of silver-based herbo-metallic colloidal nanosuspension in Terminalia bellirica fruit aqueous extract for catalytic and antibacterial applications

Abstract

In the present study, microwave-assisted, optimized, instant, Terminalia bellirica fruit extract-mediated green synthesis of colloidal silver nanoparticles (AgNPs) has been reported. The synthesized AgNPs were characterized by UV–Vis spectroscopy, FTIR, Zetasizer, FESEM, EDX and XRD. The characteristic surface plasmon peak of reaction mixture at 406 nm confirmed the synthesis of AgNPs. The FTIR studies confirmed phytoconstituents were responsible for the synthesis and stability of AgNPs. The FESEM, EDX and XRD analysis revealed the presence of spherical silver nanoparticles of mean diameter ≤20.6 nm with face-centered cubic crystalline structure. These AgNPs showed notable catalytic activity in reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4. The synthesized AgNPs showed potential antibacterial and antibiofilm activity against bacterial pathogens like Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus. Thus, these synthesized AgNPs can open avenues for the development of AgNP-based efficient nanocatalyst and potent nanomedicine in future.Electronic supplementary materialThe online version of this article (doi:10.1007/s13205-016-0589-1) contains supplementary material, which is available to authorized users.

Biosynthesis of silver nanoparticles using stem bark extracts of Diospyros montana and their antioxidant and antibacterial activities

“…Generally, Ag nanoparticles show typical optical peak at [34]. The absorption peak of O in EDX spectrum might be due to the involvement of phytocompounds in capping and stabilizing of Ag nanoparticles through O related groups [14,15].…”

“…In recent years, phytocompounds-facilitated synthesis of AgNPs is gaining significance due to their availability and eco-friendly [12]. Biosynthesis of silver nanoparticles using plants such as Eucalyptus chapmaniana [13], Momordica charantia [14], Terminalia bellirica [15], Cochlospermum religiosum [16], Eucalyptus chapmaniana [13] and many more plants has been reported. Silver nanoparticles have numerous applications such as bio-labeling, combating of microbes, detection of cancer, drug delivery and other diseases [17].…”

Controlled Production of Monodisperse Plant‐Mediated AgNP Catalysts Using Microwave Chemistry: A Desirability‐Function‐Based Multiple‐Response Optimization Approach

“…In the reduction experiments, NaBH 4 concentration was considerably excess in contrast to 4‐NP so that the reduction process guarantees the pseudo‐first order reaction conditions as shown in Figure b. An interception between the scatter plots of λ 305 and 400 nm bands was observed in time.…”

“…The estimated apparent rate constant of the reduction reaction of 4‐NP to 4‐AMP using AgNPs synthesized at the optimized conditions was observed as 0.0291 s −1 as it is discussed in detail. To make a comparison of the catalytic potential of the synthesized AgNPs with the previous studies, the activity parameter ( K =k/mass of catalyst) was used . For this aim, the suspensions of the as synthesized AgNPs at the optimized conditions were centrifuged at 15,000 rpm for 30 min.…”

“…Thus, the resulting intermediate complex of Ag + ions with hydroxyl functional groups dominates and oxidizes to the quinone form upon which the reduction of Ag + ions to Ag 0 (AgNPs) is favored. These results are well accordance with the previous reports …”