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•Nano-CsPbI3 have been fabricated via hydrothermal reaction.•The effect of different reaction condition affected on morphology, purity and size of product.•Particle size of the ...nanoparticles depends on the molar ratio of reagents and type of capping agent.•The highest decolorization percentage was observed in the presence of methyl violet (81.7%).•The maximum antibacterial activity is against Pseudomonas aeruginosa, Escherichia coli and Streptococcus pyogenes.
Perovskite nanostructures with various morphologies have designated encouraging shape-dependent characteristics. Metal-halide perovskite nanostructures have appeared as cost-effective, efficient, light-active substances for photocatalytic purposes. The photocatalytic process is an environmentally-friendly procedure that became known as an encouraging option for the destruction of various toxic contaminants. The shortcomings of the current photocatalytic system, which restricts their technical applications incorporate fast charge recombination, low-utilization of visible radiation, and low immigration capability of the photo-induced electron-hole. In this research, Cesium lead iodide (CsPbI3) perovskite nanostructures have been prepared via the hydrothermal method. The impact of multiple factors, including molar ratios of precursors, different types of capping agents, reaction time, and reaction temperature was studied on purity, morphology, and particle size of nanostructures. The photocatalytic behavior of the CsPbI3 nanostructures was studied for the destruction of organic dyes under visible light and indicated that these nanoparticles could remove and degrade organic pollutants in high value. The highest efficiency was observed in the presence of methyl violet, with a decolorization percentage of 81.7%. The results indicated that the CsPbI3 perovskite nanostructures could be used as high-performance catalysts for water pollution removal. Besides, the antibacterial results showed that the maximum antibacterial activity was against Pseudomonas aeruginosa, Escherichia coli and Streptococcus pyogenes.
Plant-mediated green synthesis of nanomaterials has been increasingly gaining popularity due to its eco-friendly nature and cost-effectiveness. In the present study, we synthesized silver ...nanoparticles (AgNPs) by using an aqueous solution of Saudi Origanum vulgare L. plant extract as a bioreducing agent. The as-synthesized AgNPs were characterized using various microscopic and spectroscopic techniques. The results indicated the formation of crystalline face-centered cubic (fcc) AgNPs. Additionally, FT-IR study confirmed that the O. vulgare L. extract not only functioned as a bioreductant but also stabilized the surface of the AgNPs by acting as a capping agent. Moreover, the effect of the amount of the plant extract on the size and the antimicrobial activity of the NPs was also assessed. It was found that with increasing amounts of plant extract, the size of the NPs was decreased. Moreover, as-synthesized AgNPs as well as O. vulgare L. plant extract were separately tested to examine their antimicrobial activities. The activities were tested against various bacterial and fungal microorganisms including Shigella sonnei, Micrococcus luteus, Escherichia coli, Aspergillus flavus, Alternaria alternate, Paecilomyces variotii, Phialophora alba, and so on. These results evidently show that the inclusion of O. vulgare L. extracts improves the solubility of AgNPs, which led to a significant enhancement in the toxicity of the NPs against the assessed microorganisms.
Research on insects and their bacterial communities provides valuable information on potential interaction between the host and their symbiotic bacteria. The aim of the present study was to evaluate ...antimicrobial activity of essential oils against Staphylococcus spp. isolated from spiders. Spiders samples were investigated microbiologically and Staphylococcus isolates were confirmed with MALDI TOF MS Biotyper. Antimicrobial activity of Satureja hortensis L., Pimpinella anisum L., Rosmarinus officinalis L., Salvia officinalis L. and Ocimum basilicum L. essential oils was detected. Altogether five Staphylococcus species were identified: S. capitis, S. epidermidis, S. haemolyticus, S. warneri and S. xylosus. All bacterial strains were resistant of ciprofloxacin, levofloxacin, amikacin and gentamicin. S. haemoliticus was the most resistant against essential oils of Rosmarinus officinalis L., Salvia officinalis L. S. warneri and S. xylosus were the most sensitive against antimicrobial action of the applied EOs.
The soil bacterium DP1B was isolated from a marine sediment collected off the coast of Randayan Island, Kalimantan Barat, Indonesia and identified based on 16S rDNA as Nocardiopsis alba. The ...bacterium was cultivated in seven different media (A1, ISP1, ISP2, ISP4, PDB, PC-1, and SCB) with three different solvents distilled water, 5 % NaCl solution, artificial seawater (ASW) combinations, shaken at 200 rpm, 30 °C, for 7 days. The culture broths were extracted with ethyl acetate and each extract was tested for its antimicrobial activity and brine shrimp lethality, and the chemical diversity was assessed using thin-layer chromatography (TLC), gas chromatography (GC), and liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS). The result showed that almost all extracts showed antibacterial but not antifungal activity, whereas their brine shrimp toxicity levels vary from high to low. The best medium/solvent combinations for antibacterial activity and toxicity were PC-1 (in either distilled water, 5% NaCl solution, or ASW) and SCB in ASW. Different chemical diversity profiles were observed on TLC, GC-MS, and LC-MS/MS. Extracts from the PC-1 cultures seem to contain a significant number of cyclic dipeptides, whereas those from the SCB cultures contain sesquiterpenes, indicating that media and solvent compositions can affect the secondary metabolite profiles of DP1B. In addition, untargeted metabolomic analyses using LC-MS/MS showed many molecular ions that did not match with those in the Global Natural Products Social Molecular Networking (GNPS) database, suggesting that DP1B has great potential as a source of new natural products.
•The marine sediment bacterium Nocardiopsis alba DP1B was isolated from Randayan Island, Indonesia.•It produced diverse metabolites with antimicrobial and antitumor activities.•Various media and solvent combinations resulted in distinct metabolomic profiles.•GNPS-based metabolomic analysis showed many unmatched molecular ions.•DP1B has great potential as a source of new natural products.
Extensive studies on the antimicrobial activity of terpene-based substances, which are the main components of essential oils, are continuously underway. And some hydrocarbons constituting ...antimicrobial substances have been reported to exhibit the antimicrobial activity. This study confirmed the production of isoprene, the most basic constituent hydrocarbon of terpene, by Rhodobacter sphaeroides, and investigated the antimicrobial activity of isoprene and its mechanism. We developed an air-sharing culture system in which different bacterial cultures aseptically shared the same atmosphere, to evaluate the effect of volatile isoprene. Effects were tested on two Gram-negative bacteria, and on two Gram-positive bacteria. As a result, the isoprene released from R. sphaeroides showed the antimicrobial activity against all evaluated strains, especially against Gram-positive bacteria than Gram-negative bacteria. In addition, the microstructure of the bacteria was evaluated via FE-SEM. The FE-SEM images showed that isoprene has the antimicrobial activity mechanism that causes cell death by acting on the cell wall or the extracellular membrane.
•Hydrophobically modified PG-zein nanocomplexes showed robust storage stability for bioactive compound delivery.•Nanocomplexes exhibited effective redispersibility of freeze-dried ensuring structural ...integrity post-processing.•Encapsulated bioactive compounds demonstrated significantly increased antioxidant capacities.•Potent antimicrobial activity against Gram-positive and Gram-negative bacteria were observed.
In this study, hydrophobically modified phytoglycogen and hydrolyzed zein were utilized to develop biodegradable and redispersible nanocomplexes for encapsulation of various bioactive phytochemicals, including eugenol, thymol, carvacrol, trans-cinnamaldehyde, and their mixtures. Comprehensive physicochemical and colloidal characterizations of these nanocomplexes were performed using dynamic light scattering, and Fourier transform infrared and atomic force microscopy, which evaluated their colloidal stability and redispersibility after freeze-drying. In addition, the antioxidant capacities and antimicrobial activities of these various nanoparticles were investigated methodically. The results revealed that the phytochemical-encapsulated nanocomplexes exhibited a particle size ranging from 60 to 70 nm, displaying a uniform distribution. Additionally, these nanocomplexes demonstrated sustained morphological and colloidal stability over 30-day storage, and after freeze-drying and subsequent redispersion processing. Furthermore, significant improvements in antioxidant and antimicrobial properties in the aqueous phase were observed. These redispersible nanocomplexes from phytoglycogen and zein hold the promising potential to address the limitations and offer practical solutions for expanding their applications in the pharmaceutical and food fields.
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