Green synthesis of ZnO nanoparticles by Olive ( Olea europaea )

Abstract

Green synthesis of nanoparticles is superior to physical and chemical methods as it is environment-friendly and cost-effective. The present study was carried out for inducing nanoparticles synthesis by zinc nitrate in the leaves extracts of olive. Further leaves extracts were evaluated for antiradical scavenging activity by 1, 1-diphenyl-2-picryl-hydrazyl assay. Morphological and structural properties of the synthesised ZnO nanoparticles have been characterised using UV-Vis spectrophotometer, FTIR, TEM, XRD and dynamic light scattering (DLS) analysis. Further, zinc oxide nanoparticles were evaluated for antiradical scavenging activity by capacity of total antioxidant assay. Synthesised ZnO nanoparticles were confirmed by the absorption maxima at the wavelength of 370 nm. TEM image revealed that ZnO nanoparticles were spherical with average size 41 nm. FTIR investigation suggested that the flavonoids, glycosides, proteins and phenols molecules can play an important role in the stabilisation of ZnO nanoparticles.

Investigation of ZnO nanoparticles on proline, anthocyanin contents and photosynthetic pigments and lipid peroxidation in the soybean

“…The hexagonal phase (data not shown) and spherical shape (Fig. 2) of nanoparticles with a mean size of 41 nm were determined by XRD and TEM, respectively [41]. Mukherjee et al [31] found that ZnO nanoparticles reduced the chlorophyll content of green peas.…”

Green synthesis of zinc oxide nanoparticles using different plant extracts and their antibacterial activity against Xanthomonas oryzae pv. oryzae

“…On the other hand, the tomato fruit extract contained majorly, terpenes, flavonoids, saponins, tannins, glycosides/carbohydrates and alkaloids (Table 1). In previous studies, use of tomato extract to obtain zinc oxide nanoparticles was effective due to the presence of ascorbic acid which acted as a reducing and capping agent [36] while the flavonoids, glycosides, proteins, and phenols played the vital role of reduction of zinc oxide when olive leaves extract were used [42]. On the other hand, the flavonoids such as flavone, glycosides, and flavonols present in chamomile flower extract acted as the reducing and capping agents for synthesis of zinc oxide [35,43].…”

Synthesis of gold nanoparticles by cotton peels aqueous extract and their catalytic efficiency for the degradation of dyes and antioxidant activity

“…The antioxidant activity of Au NPs was studied by the standard DPPH method [61,62]. The results of this study showed effective free radical scavenging capacity of Au NPs.…”