Synthesis of ZnO Nanoparticles with Antibacterial Properties Using Terminalia catappa Leaf Extract

Abstract

In order to develop alternative drugs against resistant pathogens, capped ZnO nanoparticles (NPs) were prepared using Terminalia catappa leaf extract. By changes in pH and aging time, cauliflower-like, sheet-like, and hierarchical morphologies for ZnO NPs were obtained. Their antibacterial activities against Staphylococcus aureus and Escherichia coli were investigated. The results demonstrated that the green synthesized ZnO NPs exhibit higher antibacterial activity than chemically prepared ZnO NPs. The antibacterial activity of hierarchical ZnO NPs was greater than that of the other morphologies, which was attributed to the higher oxygen vacancy in ZnO NPs leading to enhanced reactive oxygen species (ROS) generation. The mechanism of the formation of ZnO nanocrystals was also discussed.

Therapeutic Potential of Green-Engineered ZnO Nanoparticles on Rotenone-Exposed D. melanogaster (Oregon R+): Unveiling Ameliorated Biochemical, Cellular, and Behavioral Parameters

“…ROT co-exposed with MK-ZnO NPs demonstrated significantly less blue staining in the tissues mentioned above and the whole larvae when compared to the ROT plus UD-ZnO and ROT plus MC-ZnO NPs groups, respectively. This conclusion is validated by a previous investigation that showed that plant biomolecules significantly enhanced cell viability and attenuated DNA damage [ 79 , 80 ]. Biogenic ZnO-NPs are protective due to the activation of antioxidant defense mechanisms or the presence of bioactive molecules that quench free radicals.…”

Green Zinc Oxide (ZnO) Nanoparticle Synthesis Using Mangrove Leaf Extract from Avicenna marina: Properties and Application for the Removal of Toxic Metal Ions (Cd2+ and Pb2+)

“…Costus woodsonii leaf extract has been successfully used to synthesize narrow-band-gap ZnO-NPs [21]. An important environmental application has been developed by evaluating the antibacterial activity of Terminalia catappa leaf extract in plant-mediated ZnO-NPs and three other ZnO-NPs, and the activity was higher than that of the uncapped ZnO-NPs leaf extract and Terminalia catappa alone [22]. A modern method has been used to extract components from the leaves of Thymus vulgaris by developing a simple hydrothermal method and extracting phytochemicals for ZnO-NPs; the use of thymus leaf extract as a reducing agent containing flavonoids, phenols, and saponins played a significant role in the production of ZnO-NPs [23].…”

Basella alba Leaves‐Assisted Eco‐Fabrication of Ag/ZnO Nanocomposites for Anti‐Bactericidal Activity and Catalytic Degradation of Anthropogenic Pollutants

“…These dyes are characterized by a higher degree of aromaticity, intense color stability, chromophores conjugation, and excellent structural stability, which makes them refractory to degradation. Also, the chemical stability and high temperature resistance features of synthetic dyes inhibit the penetration of light, resulting in decreased dissolved oxygen capacity, which leads to the destruction of aquatic biota [2,3]. Hence, it is very difficult to remove these dyes and pollutants through natural degradation processes.…”