GREEN SYNTHESIS OF SILVER, COPPER AND ZINC NANOPARTICLES USING TABERNAEMONTANA DIVARICATA AND ITS APPLICATION.

2021 ◽  
pp. 34-37
Author(s):  
Sruti S Nair ◽  
Anchana Devi. C ◽  
Pushpa. N
Keyword(s):  
Skin Diseases ◽  
Antibacterial Activities ◽  
Sem Analysis ◽  
Single Step ◽  
Metal Nanoparticle ◽  
Spectral Measurements ◽  
Tabernaemontana Divaricata ◽  
Stem Extract ◽  
Characterization Studies ◽  
Nanoparticles Of Silver

Nanoparticles are particles of any shape with size ranging from 10 to 100 nm. Synthesis of metal nanoparticle is a single step process, which is inexpensive and eco-friendly method. Metals such as silver, zinc and copper can be used for the production of nanoparticles. Tabernaemontana divericata have been reported to exhibit antimicrobial, antioxidant, antitumor and analgesic effect. It's used for wound healing and treatment of various diseases like skin diseases, aches, ascaris, scabies eye diseases and pain. Nanoparticles of silver, zinc and copper were biosynthesised from the stem extract of Tabarnaemontana divaricata. Characterization studies were carried out using UV spectrophotometer, FTIR & SEM analysis. The nanoparticle were tested for it potential antibacterial activities. Among the three, AgNPs nanoparticle exhibited more antimicrobial activity than the CuNPs, and ZnNPs. The biomolecules in T. divericata stem extract with the potential to reduce and cap the bio reduced AgNPs were assessed with FTIR spectral measurements.

scholarly journals Murine interfollicular epidermal differentiation is gradualistic with GRHL3 controlling progression from stem to transition cell states

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ziguang Lin ◽  
Suoqin Jin ◽  
Jefferson Chen ◽  
Zhuorui Li ◽  
Zhongqi Lin ◽  
...  
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Skin Diseases ◽  
Basal Layer ◽  
Terminal Differentiation ◽  
Skin Surface ◽  
Single Step ◽  
Epidermal Differentiation ◽  
Inflammatory Skin Diseases ◽  
Cell State

Abstract The interfollicular epidermis (IFE) forms a water-tight barrier that is often disrupted in inflammatory skin diseases. During homeostasis, the IFE is replenished by stem cells in the basal layer that differentiate as they migrate toward the skin surface. Conventionally, IFE differentiation is thought to be stepwise as reflected in sharp boundaries between its basal, spinous, granular and cornified layers. The transcription factor GRHL3 regulates IFE differentiation by transcriptionally activating terminal differentiation genes. Here we use single cell RNA-seq to show that murine IFE differentiation is best described as a single step gradualistic process with a large number of transition cells between the basal and spinous layer. RNA-velocity analysis identifies a commitment point that separates the plastic basal and transition cell state from unidirectionally differentiating cells. We also show that in addition to promoting IFE terminal differentiation, GRHL3 is essential for suppressing epidermal stem cell expansion and the emergence of an abnormal stem cell state by suppressing Wnt signaling in stem cells.

Facile Synthesis of Activated Carbon from Swamp Taro Stalk via Single Step ZnCl2 Activation

2016 ◽  
Vol 857 ◽  
pp. 475-479 ◽  
Author(s):  
M.S. Mohammed Yahya ◽  
Jeyashelly Andas ◽  
Ghani Zaidi Ab
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Total Pore Volume ◽  
Structure Type ◽  
Sem Analysis ◽  
Single Step ◽  
Bet Surface Area ◽  
Type Iv

In this work, mesoporous activated carbon with high surface area was synthesized from swamp taro stalk by single step ZnCl2 activation. The synthesized activated carbon was characterized by Na2S2O3 volumetric method, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM) and N2 adsorption-desorption analyses. Under the single step ZnCl2 activation, the registered iodine number, BET surface area, total pore volume and pore diameter were 1087.57 mgg-1, 1242.26 m2g-1, 0.73cm3g-1 and 3.72 nm respectively with yield of 25.34%. SEM analysis evidenced the well-formation of porous structure. Type IV isotherm with H2 loops obtained from N2-sorption studies indicates the ink bottles shape mesoporous network structure. This research proved the successful conversion of plant waste into high grade activated carbon.

scholarly journals Molecular Computation and Antibacterial Activity of Cu (II) Complex of Naphthaldehyde Thiosemicarbazone

2020 ◽  
pp. 85-93
Keyword(s):  
Antibacterial Activity ◽  
Molecular Geometry ◽  
Inhibition Zone ◽  
Antibacterial Activities ◽  
Spectral Measurements ◽  
Gram Positive ◽  
Activity Data ◽  
Gram Negative ◽  
Diffusion Technique ◽  
Parent Ligand

Copper (II) complex of naphthaldehyde thiosemicarbazone (L) has been synthesized and characterized by melting points, conductance, magnetic, infrared, and ESI-MS spectral measurements in addition to elemental analysis. A tetrahedral structure is suggested for the complex. The antibacterial activities of the complex and ligand were evaluated by the disc diffusion technique. Pure bacteria cultures of Bacillus subtilis (Gram-positive) and Escherichia coli (Gram-negative) were used to check the antibacterial activities of the synthesized compounds. Antibacterial activities were compared by measuring the inhibition zone diameter and chloramphenicol was used as a reference. Both the compounds showed significant antibacterial activity in different range against gram-positive & gram-negative bacteria. The antibacterial activity data also show that the Cu(II) complex to be more effective than the parent ligand. Molecular geometry of the complex has been optimized by ChemDraw Ultra 12.0 and then MM2 calculation has been done.

scholarly journals In Vitro Antioxidant and Antimicrobial Activities of Ephedra gerardiana (Root and Stem) Crude Extract and Fractions

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Aman Khan ◽  
Gul Jan ◽  
Afsar Khan ◽  
Farzana Gul Jan ◽  
Ali Bahadur ◽  
...  
Keyword(s):  
Crude Extract ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Antibacterial Activities ◽  
Antimicrobial Activities ◽  
Aqueous Fraction ◽  
Oxidative Stresses ◽  
Crude Extracts ◽  
Stem Extract

The utilization of medicinal plants to treat infectious disease is a common practice in developing countries worldwide. The present study was aimed at evaluating the crude extracts of Ephedra gerardiana (root and stem) with different chemicals for antioxidant and antimicrobial (fungal and bacterial) potential. The results revealed that the ethyl acetate fractions of E. gerardiana (root and stem) have significant free radical scavenging potential with values 2.96±0.39 and 2.73±0.84 while n-butanol and aqueous fractions showed IC502.69±0.26 and 3.44±0.69 µg/ml in stem. Furthermore, crude extract and fractions also revealed promising antibacterial activities against all tested microbial strains while aqueous fraction showed no activities against Bacillus subtilis, Kleibsiella pneumoniae, and Pseudomonas aeruginosa. Interestingly, all crude extracts and fractions were nonactive against fungal strain, Aspergillus niger and Aspergillus flavus, as compare to control. In summary, the Ephedra gerardiana (root and stem) extract and fraction possess antioxidant activities, which might be helpful in preventing or slowing the progress of various oxidative stresses, suggested to be a strong pharmaceutical agent.

Nanocomposite Route to Ultra-sensitive Surface Enhanced Raman Scattering Substrates

2010 ◽  
Vol 1253 ◽  
Author(s):  
Abhijit Biswas ◽  
Ilker Bayer ◽  
Alexandru S. Biris
Keyword(s):  
Hot Spots ◽  
Direct Detection ◽  
Single Step ◽  
Metal Nanoparticle ◽  
Label Free ◽  
Step Method ◽  
Sers Substrates ◽  
The Matrix ◽  
Polymer Metal ◽  
Metal Nanocomposites

AbstractWe show a novel route to prepare SERS substrates, which is based on polymer–metal nanocomposites with a specific structure and composition just below the percolation threshold. The neighboring nanoparticles are still quite densely packed, but remain separated by narrow polymer gaps (<1 nm). Such a nanostructure allows the creation of densely packed hot spots where electromagnetic energy can be confined. The polymer–metal nanocomposites are fabricated by a simple and single-step method of electron-beam-assisted vapor-phase co-deposition. The preparation of the SERS substrates is based on a simple plasma-etching process, which removes the polymer structures that allow the formation of metal nanoparticle SERS nano-aggregates with very uniform and controllable inter-particle gaps. The method results in “ideal SERS hot spots” throughout the matrix. These hot spots can be created over very large areas. The prepared SERS substrates are promising candidates for the direct detection (label-free) and analysis of various biological and chemical samples.

scholarly journals Electrosynthesis and thermal characterization of basic copper carbonate nanoparticles

2009 ◽  
Vol 7 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Seied Pourmortazavi ◽  
Iraj Kohsari ◽  
Seiedeh Hajimirsadeghi
Keyword(s):  
Metallic Copper ◽  
Average Particle Size ◽  
Thermal Characterization ◽  
Sem Analysis ◽  
Single Step ◽  
Average Particle ◽  
Copper Carbonate ◽  
Temperature Range ◽  
Dta Analysis ◽  
Size Of Particles

AbstractThe present study concerns the electrochemical synthesis of basic copper carbonate nanoparticles by oxidation of metallic copper on the anode in an aqueous bicarbonate solution. This simple and one-step preparation can be considered as green synthesis. The scanning electron microscopy (SEM) analysis indicates that average particle size of the product is in the range of about 70 nm. On the other hand, basic copper carbonate micro-powder has been prepared, by mixing solutions of copper(II) sulphate and sodiu bicarbonate. The SEM analysis showed that the size of particles prepared in the same way is in the range of about 1 µm. In another part of this study, the thermal decomposition of micro and nanoparticles of copper carbonate produced by various methods was studied in air using TG-DTA techniques. The results of thermal study show that the decomposition of both samples occurs in single step. Also, the TG-DTA analysis of the nanoparticles indicates that the main thermal degradation occurs in the temperature range of 245–315°C. However, microparticles of Cu(OH)2 · CuCO3 decomposed endothermally in the temperature range of 230–330°C.

scholarly journals A novel approach for the production of zinc borate (4ZnO·B2O3·H2O) using a single-step hydrothermal method

2020 ◽  
Vol 44 (1) ◽  
pp. 1-8
Author(s):  
Ali Yalçın ◽  
Mehmet Gönen
Keyword(s):  
Zinc Oxide ◽  
Reaction Time ◽  
Boric Acid ◽  
Heterogeneous Reaction ◽  
Fire Retardant ◽  
Sem Analysis ◽  
Single Step ◽  
Hot Water ◽  
Zinc Borate ◽  
Novel Approach

Abstract Zinc borate having the formula of 4ZnO·B2O3·H2O has been used as a fire retardant for polymers requiring high processing temperatures since it has a high dehydration temperature (around 415°C). The effects of reaction time, reaction temperature were investigated on the heterogeneous reaction between solid zinc oxide and boric acid solution. A stoichiometric amount of zinc oxide and 5.0% excess boric acid were used in experiments and the other parameters, mixing speed (1700 rpm), the solid-liquid ratio of 20%, and the amount of seed crystal (3.9% wt) were kept constant for all experiments. A 91.1% conversion was obtained at 120°C for 5 h of reaction time. Precipitated product was filtered and washed by hot water to remove the excess boric acid. Finally it was dried until reaching to a constant mass in an air circulating oven at 105°C. Powder products were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). FTIR spectrum and XRD pattern of powders are consistent with data of the zinc borate given in the literature. According to SEM analysis, whiskers are less than 1 μm in diameter and their lengths are in the range of 1–10 μm.

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