Biogenic synthesis of silver nanoparticles using cell-free extract of Bacillus safensis LAU 13: antimicrobial, free radical scavenging and larvicidal activities
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Agbaje Lateef
, Sunday A. Ojo
Abstract
The cell-free extract of Bacillus safensis LAU 13 strain (GenBank accession No: KJ461434) was used for green biosynthesis of silver nanoparticles (Ag-NPs). Characterization of Ag-NPs was carried out using UV-VIS spectroscopy, Fourier-transform infrared spectroscopy, and transmission electron microscopy. Evaluation of synthesized Ag-NPs as antimicrobial agents was done using multi-drug resistant clinical isolates as well as their synergistic effects when combined with some selected antibiotics. Furthermore, potential of Ag-NPs as antimicrobial additives in paint was demonstrated. The Ag-NPs have maximum absorbance at 419 nm, with peaks at 3308, 2359, 1636, and 422 cm−1, indicating that proteins were the capping and stabilisation molecules in the synthesis of Ag-NPs. The particles were spherical shaped having size of 5-95 nm, with silver as the prominent metal from the energy dispersive X-ray analysis, while selected area electron diffraction pattern agrees well with the crystalline nature and face-centred cubic phase of Ag-NPs. Inhibition of Staphylococcus aureus, Escherichia coli, Klebsiella granulomatis and Pseudomonas aeruginosa was achieved at 100 μg/mL. Improvement of activities of augmentin, ofloxacin and cefixime to the tune of 7.4-142.9% was achieved in synergistic study, while total inhibitions of P. aeruginosa, S. aureus, Aspergillus flavus and Aspergillus fumigatus were achieved in Ag-NPs-paint admixture. The Ag-NPs showed potent antioxidant and larvicidal activities with IC50 and LC50 of 15.99 and 42.19 μg/mL, respectively. The present study demonstrated that the biosynthesized Ag-NPs have potent biological activities, which can find applications in diverse areas. The report adds to the growing biotechnological relevance of B. safensis.
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Artikel in diesem Heft
- An overview of phytochrome: An important light switch and photo-sensory antenna for regulation of vital functioning of plants
- A novel GH13 subfamily of α-amylases with a pair of tryptophans in the helix α3 of the catalytic TIM-barrel, the LPDlx signature in the conserved sequence region V and a conserved aromatic motif at the C-terminus
- Biogenic synthesis of silver nanoparticles using cell-free extract of Bacillus safensis LAU 13: antimicrobial, free radical scavenging and larvicidal activities
- Understanding taxonomic position of local endemic Agropyron deweyi (Poaceae) using morphological characters and sequences of nuclear and chloroplast DNA regions
- Genetic status of the putative hybrid swarms of mountain dwarf pine and Scots pine in contact zones of their distribution in Slovakia
- Species delimitation and population structure in three Onosma (Boraginaceae) species
- Glycinebetaine priming improves salt tolerance of wheat
- The effect of nitrogen level on rice growth, carbon-nitrogen metabolism and gene expression
- High efficiency Agrobacterium-mediated transformation of Pinellia ternata using petiole explants from submerged cultures
- Cryopreservation of Serbian autochthonous Prunus spp. by droplet-vitrification
- Response of green hydra (Hydra viridissima) to variability and directional changes in food availability
- Data on some members of the family Tylenchidae (Nematoda: Tylenchina) from Iran
- New and firstly recorded oribatid mites from Turkey
- Reproductive parameters of four species of water mites (Acari: Hydrachnidia)
- A new species of the genus Aeolothrips (Thysanoptera: Aeolothripidae) from Iran
- Skull variability of mice and voles inhabiting the territory of a great cormorant colony
- High glucose-associated osmolality promotes adipocytogenic differentiation of primary rat osteoblasts in a protein kinase A and phosphatidylinositol 3-kinase/Akt-dependent manner
- Direct influence of rooibos-derived compound on rabbit ovarian functions and their response to gonadotropins
- Corrective notice to the European mudminnow (Umbra krameri Walbaum, 1792) record from the Black Sea