scholarly journals Green synthesis of magnesium nanoparticles mediated from Rosa floribunda charisma extract and its antioxidant, antiaging and antibiofilm activities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Inas Y. Younis ◽  
Seham S. El-Hawary ◽  
Omayma A. Eldahshan ◽  
Marwa M. Abdel-Aziz ◽  
Zeinab Y. Ali
Keyword(s):  
Ascorbic Acid ◽  
Electron Microscope ◽  
Xanthine Oxidase ◽  
Solid Phase ◽  
Floral Scent ◽  
Radical Scavenging ◽  
Dependent Manner ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Magnesium Nanoparticles

AbstractFlower based nanoparticles has gained a special attention as a new sustainable eco-friendly avenue. Rosa floribunda charisma belongs to modern roses with bright yellow, red flowers with marvellous rose scent. Different methods were used for the extraction of its floral scent such as hexane, microwave, and solid-phase micro-extraction. The latter was the most efficient method for the extraction of phenyl ethyl alcohol, the unique scent of roses. In the current study, magnesium nanoparticles (RcNps) have been synthesized using Rosa floribunda charisma petals that have privileges beyond chemical and physical routs. RcNps formation was confirmed using UV–Visible (UV–Vis) Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), High Resolution-Transmission Electron Microscope (HR-TEM), Field Emission-Scanning Electron Microscope (FE-SEM), Energy dispersive X-ray (EDX), X-ray Diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). HR-TEM images detected the polyhedral shape of RcNps with a diverse size ranged within 35.25–55.14 nm. The resulting RcNps exhibited a high radical scavenging activity illustrated by inhibition of superoxide, nitric oxide, hydroxyl radical and xanthine oxidase by by IC50 values 26.2, 52.9, 31.9 and 15.9 µg/ml respectively as compared to ascorbic acid. Furthermore, RcNps at concentration of 100 µg/ml significantly reduced xanthine oxidase activity (15.9 ± 0.61 µg/ml) compared with ascorbic acid (12.80 ± 0.32 µg/ml) with p < 0.05. Moreover, RcNps showed an excellent antiaging activity demonstrated by inhibition of collagenase, elastase, hyaluronidase and tyrosinase enzymes in a dose-dependent manner with IC50 values of 58.7 ± 1.66 µg/ml, 82.5 ± 2.93 µg/ml, 191.4 ± 5.68 µg/ml and 158.6 ± 5.20 µg/ml as compared to EGCG respectively. RcNps also, exhibited a promising antibacterial activity against three skin pathogens delineate a significant threat to a public health, as Staphylococcus epidermidis, Streptococcus pyogenes, and Pseudomonas aeruginosa with MIC of 15.63, 7.81, 31.25 µg/ml as compared to ciprofloxacin (7.81, 3.9 and 15.63 µg/ml). Moreover, RcNps suppressed the formation of biofilms with minimum biofilm inhibitory concentrations 1.95, 1.95, 7.81 µg/ml against the fore mentioned strains, respectively. Overall, our findings indicate that Rosa floribunda nanoparticles could be used as a leading natural source in skin care cosmetic industry.

The Structural, Magnetic and Optical Properties of Ni-Mg-Zn Ferrite Prepared With Different Complexing Agents via Sol-Gel Method

2021 ◽  
Author(s):  
Yanchun Zhang ◽  
Aimin Sun ◽  
Zhaxi Suonan
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Sol Gel ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Zn Ferrite ◽  
Vis Spectroscopy

Abstract Different complexing agents were used to prepare Ni-Mg-Zn ferrite with the composition formula Ni0.2Mg0.2Zn0.6Fe2O4 via sol-gel method, which included citric acid, oxalic acid, egg white and EDTA. The Ni0.2Mg0.2Zn0.6Fe2O4 ferrite with no complexing agent was also prepared as a comparison. The chemical phases of samples were analyzed by the X-ray diffraction (XRD), which indicated that samples had spinel phase structure. The lattice constants of samples are in the range of 8.3980 ~ 8.4089 Å. The composition and structure were further studied by fourier transform infrared spectroscopy (FTIR). There were two typical characteristic bands related to the stretching vibrations of spinel ferrite in FTIR spectra. Scanning electron microscope (SEM) micrographs and transmission electron microscope (TEM) images showed that the particles have the shape of spherical cube. Energy dispersive spectrometer (EDS) analyzed the elements and ingredients of samples, which included Ni, Mg, Zn, Fe and O. X-ray photoelectron spectroscopy (XPS) is used to examine further the elemental composition and chemical state of sample prepared with EDTA as complexing agent. The optical properties of samples were investigated by photoluminescence spectra and UV-Vis spectroscopy. Vibrating sample magnetometer (VSM) was used to characterize magnetic properties, hysteresis loops revealed the ferrimagnetism behavior of prepared samples.

Study on the Properties of Doped La in BaBi4Ti4O15 Ceramic

2007 ◽  
Vol 26-28 ◽  
pp. 243-246
Author(s):  
Xing Hua Yang ◽  
Jin Liang Huang ◽  
Xiao Wang ◽  
Chun Wei Cui
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Sintering Temperature ◽  
Solid Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lanthanum Content ◽  
Scanning Electron

BaBi4-xLaxTi4O15 (BBLT) ceramics were prepared by conventional solid phase sintering ceramics processing technology. The crystal structure and the microstructure were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD analyses show that La3+ ions doping did not change the crystal structure of BBT ceramics. The sintering temperature increased from 1120°C to 1150°C with increasing Lanthanum content from 0 to 0.5, but it widened the sintering temperature range from 20°C to 50°C and refined the grain size of the BBT ceramic. Additionally, polarization treatment was performed and finally piezoelectric property was measured. As a result, the piezoelectric constant d33 of the 0.1at.% doped BBLT ceramics reached its highest value about 22pc/N at polarizing electric field of 8kV/mm and polarizing temperature of 120°C for 30min.

scholarly journals In Vitro Antioxidant Activity of Dibenz[b,f]azepine and its Analogues

2008 ◽  
Vol 5 (s2) ◽  
pp. 1123-1132 ◽  
Author(s):  
H. Vijay Kumar ◽  
C. R. Gnanendra ◽  
Nagaraja Naik ◽  
D. Channe Gowda
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
In Vitro Models ◽  
Antioxidant Compounds ◽  
Dependent Manner ◽  
Concentration Dependent Manner

Dibenz[b,f]azepine and its five derivatives bearing different functional groups were synthesized by known methods. The compounds thus synthesized were evaluated for antioxidant potential through different in vitro models such as (DPPH) free radical scavenging activity,ß-carotene-linoleic acid model system, reducing power assay and phosphomolybdenum method. Under our experimental condition among the synthesized compounds dibenz[b,f]azepine (a) and 10-methoxy-5H-dibenz[b,f]azepine (d) exhibited potent antioxidant activity in concentration dependent manner in all the above four methods. Butylated hydroxyl anisole (BHA) and ascorbic acid (AA) were used as the reference antioxidant compounds. The most active compounds like dibenz[b,f]azepine and its methoxy group substituent have shown more promising antioxidant and radical scavengers compared to the standards like BHA and ascorbic acid. It is conceivable from the studies that the tricyclic amines,i.e. dibenz[b, f]azepine and some of its derivatives are effective in their antioxidant activity properties.

scholarly journals SINTESIS NANOPARTIKEL COBALT FERRITE (CoFe2O4) DENGAN METODE KOPRESIPITASI DAN APLIKASINYA SEBAGAI FOTOKATALIS

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Suaib Suaib ◽  
Henry Aritonang ◽  
Harry S. J. Koleangan
Keyword(s):  
Methylene Blue ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Exposure Time ◽  
Contact Time ◽  
Cobalt Ferrite ◽  
Cofe2o4 Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Scanning Electron

ABSTRAKTelah dilakukan penelitian tentang kemampuan fotokatalis nanopartikel CoFe2O4 dalam mendegradasi zat warna sintetik Methylene Blue (MB) menggunakan metode kopresipitasi. Nanopartikel tersebut dikarakterisasi menggunakan X-Ray Diffractometry (XRD), Scanning Electron Microscope (SEM) dan spektroskopi UV-vis. Kemampuan fotokatalis dilakukan melalui penentuan konsentrasi Methylene Blue yang tersisa setelah waktu kontak nanopartikel CoFe2O4 dengan larutan Methylene Blue 5 ppm yang disinari sinar UV-A selama 30, 45, 60, 90 dan 120 menit.  Penentuan konsentrasi dihitung berdasarkan absorbansi yang didapatkan dari hasil pembacaan uji Spektrofotometri UV-vis lalu digunakan rumus menghitung % degradasi. Hasil penelitian menunjukkan bahwa kemampuan fotokatalis paling baik adalah nanopartikel CoFe2O4 dengan nilai % degradasi untuk variasi waktu penyinaran 60 menit adalah sebesar 40,72 %. ABSTRACTA research on the ability of CoFe2O4 nanoparticles degradation of as photocatalyst to dyemethylene Blue(MB) synthetic using coprecipitation method. The nanoparticles were characterized using X-ray diffractometry (XRD), Scanning Electron Microscope (SEM) and UV-Vis spectroscopy. The ability of the photocatalyst is done by determining the concentration of Methylene Blue residu after contact time of CoFe2O4 nanoparticleswith a solution of Methylene Blue 5 ppm irradiated UV-A for 30, 45, 60, 90 and 120 minutes. Determining the concentration is calculated based on the absorbance obtained from the results of analysis UV-vis spectrophotometry and then used a formula calculating the% degradation. The results showed that ability is the best photocatalyst CoFe2O4 nanoparticles with the value of% degradation for variations in exposure time of 60 minutes is equal to 40.72 %. 

scholarly journals Synthesis, Spectroscopic Study and Radical Scavenging Activity of Kaempferol Derivatives: Enhanced Water Solubility and Antioxidant Activity

2019 ◽  
Vol 20 (4) ◽  
pp. 975 ◽  
Author(s):  
Sui-Ping Deng ◽  
Yi-Li Yang ◽  
Xing-Xing Cheng ◽  
Wen-Rong Li ◽  
Ji-Ye Cai
Keyword(s):  
Antioxidant Activity ◽  
Water Solubility ◽  
High Resolution Mass Spectrometry ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Dependent Manner ◽  
Thermal Methods ◽  
Vis Spectroscopy

Kaempferol (Kae) is a natural flavonoid with potent antioxidant activity, but its therapeutic use is limited by its low aqueous solubility. Here, a series of Kae derivatives were synthesized to improve Kae dissolution property in water and antioxidant activity. These compounds included sulfonated Kae (Kae-SO3), gallium (Ga) complexes with Kae (Kae-Ga) and Kae-SO3 (Kae-SO3-Ga). The compound structures were characterized by high-resolution mass spectrometry (HRMS), nuclear magnetic resonance (NMR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and thermal methods (TG/DSC). The results showed that a sulfonic group (-SO3) was successfully tethered on the C3’ of Kae to form Kae-SO3. And in the metal complexation, 4-CO and 3-OH of the ligand participated in the coordination with Ga(III). The metal-to-ligand ratio 1:2 was suggested for both complexes. Interestingly, Kae-SO3-Ga was obviously superior to other compounds in terms of overcoming the poor water-solubility of free Kae, and the solubility of Kae-SO3-Ga was about 300-fold higher than that of Kae-Ga. Furthermore, the evaluation of antioxidant activities in vitro was carried out for Kae derivatives by using α,α-diphenyl-β-picrylhydrazyl (DPPH) and 2,2’-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid) diammonium salt (ABTS) free radical scavenging. The results showed that Kae-SO3-Ga was also optimal for scavenging free radicals in a dose-dependent manner. These data demonstrate that sulfonate kaempferol-gallium complex has a promising future as a potential antioxidant and as a potential therapeutic agent for further biomedical studies.

pH sensor based on Au NPs/ ITO membrane as extended gate field-effect transistor

2021 ◽  
Author(s):  
Saleh K. Alsaee ◽  
Naser Mahmoud Ahmed ◽  
Elham Mzwd ◽  
Ahmad Fairuz Omar ◽  
A.I. Aljameel ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
Indium Tin Oxide ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Spectroscopic Techniques ◽  
Au Nps ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Effect Transistor

Abstract In the present work, gold nanoparticles (Au NPs) were synthesized on indium tin oxide (ITO) thin film on glass substrate for the pH sensing application based on extended gate field effect transistor (EGFET). The ITO thin film was deposited on glass using RF sputtering and then the Au NPs were synthesized on it by pulsed laser ablation in liquid (PLAL) technique. The Au NPs were characterized using transmission electron microscope (TEM), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and UV-Vis spectroscopic techniques. From the TEM analysis, the size of the spherical shaped Au NPs was found to be in the range of 5–22 nm. The UV-Vis spectroscopy analysis revealed absorption peak at 518 nm, indicating purplish red color. The XPS data revealed Au 4f doublet binding energy peaks of the photoelectrons at 83.79 and 87.45 eV. The current-voltage (I-V) curves indicated pH sensitivities values of 43.6 mV/pH and 0.6 \({\left(\mu A\right)}^{\frac{1}{2}} /pH\) with linear regression of 0.9. The hysteresis and drift characteristics of Au NPs/ITO/G membrane were also studied to investigate its stability and reliability. The results of this work demonstrated that the Au NPs/ITO/G membrane is quite useful for the acidity and basicity detection.

scholarly journals Evaluation of Ethnopharmacological and Antioxidant Potential ofZanthoxylum armatumDC.

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Rabia Kanwal ◽  
Muhammad Arshad ◽  
Yamin Bibi ◽  
Saira Asif ◽  
Sunbal Khalil Chaudhari
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Antioxidant Potential ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Zanthoxylum Armatum

Zanthoxylum armatumDC. (syn.Z. alatumRoxb.) is an important medicinal plant commonly called Timur or Indian prickly ash. The ethnopharmacological study ofZ. armatumrevealed the use of different plant parts for curing various ailments including cholera, chest infection, fever, indigestion, stomach disorders, gas problems, piles, toothache, gum problems, dyspepsia, as carminative, antipyretic, aromatic, tonic, and stomachic. Keeping in view the medicinal potential of the plant, the antioxidant activity was evaluated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, reducing power, and phosphomolybdate assay using different concentrations (7.81 μg/mL–250 μg/mL). Ascorbic acid was taken as standard. The results indicated that the free radical scavenging activity ranged from 40.12% to 78.39%, and the reductive potential ranged from 0.265 nm to 1.411 nm while the total antioxidant activity ranged from 0.124 nm to 0.183 nm. The antioxidant potential evaluated by three assays increased in a concentration dependent manner and ascorbic acid showed better antioxidant activity than leaf extract. Results obtained through different tests confirmed redox protective activities ofZanthoxylum armatum. Further in vitro and in vivo research should be performed, so this plant can be further utilized in drug development.

ZnO Tetrapods for Potential Photocatalytic Dye Degradation

2018 ◽  
Vol 779 ◽  
pp. 97-101 ◽  
Author(s):  
Shynggys Sadyk ◽  
Timur Sh. Atabaev
Keyword(s):  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Dye Degradation ◽  
Uv Light ◽  
Photocatalytic Properties ◽  
Light Illumination ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Photocatalytic Dye Degradation ◽  
Scanning Electron

In this study, a facile method was used to prepare ZnO tetrapods for potential dye degradation applications. Field emission scanning electron microscope (FESEM), energy-dispersive X-ray spectroscopy (EDX) and UV-Vis spectroscopy were employed to investigate the morphology, chemical composition, and photocatalytic properties of prepared ZnO tetrapods. A Rhodamine B (RB) dye was used as a model dye to study the photocatalytic activity of the prepared sample. It was shown that RB dye can be efficiently degraded in the presence of ZnO tetrapods under continuous UV-light illumination. Thus, prepared ZnO tetrapods with excellent photocatalytic properties can be potentially used in wastewater treatment.

scholarly journals Au@Ag Core@Shell Nanoparticles Synthesized with Rumex hymenosepalus as Antimicrobial Agent

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jesús Mauro Adolfo Villalobos-Noriega ◽  
Ericka Rodríguez-León ◽  
César Rodríguez-Beas ◽  
Eduardo Larios-Rodríguez ◽  
Maribel Plascencia-Jatomea ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bimetallic Nanoparticles ◽  
Lag Phase ◽  
Core Shell ◽  
Root Extract ◽  
Dependent Manner ◽  
X Ray ◽  
Transmission Electron ◽  
Gold Silver ◽  
Vis Spectroscopy

AbstractIn this work, we used a sequential method of synthesis for gold–silver bimetallic nanoparticles with core@shell structure (Au@AgNPs). Rumex hymenosepalus root extract (Rh), which presents high content in catechins and stilbenes, was used as reductor agent in nanoparticles synthesis. Size distribution obtained by Transmission Electron Microscopy (TEM) gives a mean diameter of 36 ± 11 nm for Au@AgNPs, 24 ± 4 nm for gold nanoparticles (AuNPs), and 13 ± 3 nm for silver nanoparticles (AgNPs). The geometrical shapes of NPs were principally quasi-spherical. The thickness of the silver shell over AuNPs is around 6 nm and covered by active biomolecules onto the surface. Nanoparticles characterization included high angle annular dark field images (HAADF) recorded with a scanning transmission electron microscope (STEM), Energy-Dispersive X-ray Spectroscopy (EDS), X-Ray Diffraction (XRD), UV–Vis Spectroscopy, Zeta Potential, and Dynamic Light Scattering (DLS). Fourier Transform Infrared Spectrometer (FTIR), and X-ray Photoelectron Spectroscopy (XPS) show that nanoparticles are stabilized by extract molecules. A growth kinetics study was performed using the Gompertz model for microorganisms exposed to nanomaterials. The results indicate that AgNPs and Au@AgNPs affect the lag phase and growth rate of Escherichia coli and Candida albicans in a dose-dependent manner, with a better response for Au@AgNPs

scholarly journals Fabrication of Titanium Dioxide Nanoparticles Using Sunflower Leaf Extract and Their Applications Towards the Synthesis and Biological Evaluation of Some Novel Phenanthro Imidazole Derivatives

2021 ◽  
Vol 12 (3) ◽  
pp. 3372-3389
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Radical Scavenging ◽  
Biological Evaluation ◽  
Solution Stability ◽  
Simple Method ◽  
Tio2 Nps ◽  
X Ray ◽  
Imidazole Derivatives ◽  
Vis Spectroscopy

Plant-mediated synthesis of nanomaterials has been increasingly practiced day by day due to its eco-friendly nature, simple method without using any hazardous chemicals and solvent. In the present study, we synthesized Titanium dioxide nanomaterials (TiO2 NPs) using sunflower leaves extract. The synthesized TiO2 NPs was confirmed by ultraviolet-visible (UV-Vis) spectroscopy, while morphology and size of the NPs were identified by Scanning Electron Microscopy (SEM); elemental composition of materials analyzed by using Energy Dispersive X-ray (EDAX) analysis, and functional groups in plant extract identified by using Fourier Transform Infrared Spectroscopy (FTIR) analysis responsible for reducing and stabilizing of NPs, crystalline nature of NPs identification by using X-ray diffraction analysis (XRD), colloidal solution stability, the thermal stability of NPs noticed by dynamic light scattering (DLS) and thermo-gravimetric analyses. The synthesized green catalyst TiO2 NPs mediated novel Phenenthro [9,10-d imidazole derivatives(9a-e) have been successfully synthesized with good yields by reacting to 3-methyl-5-phenoxy-1-phenyl-1H-pyrazole-4-carbaldehydes with 9,10-phenanthrene quinone and ammonium acetate. The structures of the synthesized molecules were characterized by NMRspectroscopy. The fluorescence property of the synthesized molecules (9a-e) in acetonitrile solvent was studied, and all the compounds showed good emission intensity. An in-silico molecular docking was performed on the synthesized molecules (9a-e) using aldose reductase as a target protein. Overall, studies indicate that compounds (9a-e)are promising in developing novel anti-diabetic drugs in the future. The synthesized molecules (9a-e) were further screened for antioxidant activity by DPPH radical scavenging method.

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