Applications of Highly Stable Silver Nanoparticles from Garcinia mangostana Pericarp Extract: Bioactivities, Catalysis, and Optical Sensing

Abstract

In this work, the Garcinia mangostana pericarp aqueous extract was utilized as an efficient reducing agent for the phyto‐synthesis of eco‐friendly silver nanoparticles (GM/AgNPs (GMAs)). Characterization of the as‐synthesized material revealed the optimal synthesis conditions of 1 mL of the extract, 1.6 mL of AgNO3, and 1 mL of pH 10 buffer solution at 70 °C for 30 min of reaction. The formation and distribution of quasi‐spherical silver nanoparticles were elucidated with an average particle size of 22.12±1.106 nm, whilst the colloidal system of GMAs also possessed a negative surface charge (−25.4 mV) with such low particle instability parameters (PIP), signifying great stability even after 8 weeks. Furthermore, the material demonstrated excellent bioactivities, wherein a good inhibitory was acquired towards both P. aeruginosa and S. aureus. Besides, the synthesized GMAs provided great catalytic reduction performances, which removed 98.75, 96.55, and 90.85 % of RhB, MO, and 4‐NP, respectively, within 120 s. Along with a low detection limit for surveyed heavy metal ions as well as H2O2 in specific concentration ranges, the phyto‐synthesized GMAs can be efficaciously employed in a wide range of environmental applications, namely in the medical and wastewater remediation sectors.

Bactericidal Effect and Cytotoxicity of Graphene Oxide/Silver Nanocomposites

“…24−30 The reduced graphene oxide (rGO) and AgNP hybrid films showed improved antibacterial activity because of silver binding to the lamellar structure of rGO as a substrate. 31 For instance, Zhang et al discovered that graphene-based paper has superior antibacterial properties, which enables the fabricated graphene-based paper to kill bacteria. 32 Huang and colleagues discovered that the modified graphene oxide (GO) nanosheets offered improved antibacterial activity through the synergistic effects of silver after incorporating them into GO sheets.…”