scholarly journals Antimicrobial Activity of Synthesized Multi-Metallic Nanoparticles using Traditional Indian Siddha Method

2022 ◽  
Vol 34 (2) ◽  
pp. 443-447
Author(s):  
Kaviarasu Balakrishnan ◽  
Sivabalan Arumugam ◽  
Dhineshkumar Ezhumalai ◽  
Ramasamy Karthikeyan ◽  
G.N. Magesan

In present work, multi-metallic nanoparticles were synthesized by chemical method in a controlled environment by using silver, lead, mercury, egg shell powder (contains 1% calcium phosphate, 1% magnesium carbonate, 94% calcium carbonate and 4% organic matter), potassium nitrate, potassium alum and extracts of citrus lemon by following the process defined in Traditional Indian Medicine, Siddha System of Medicine. The morphology, compositions and structure of the product were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and transmission electron microscopy (TEM) techniques. Highly uniform spherical multi-metallic nanoparticle was subjected for the antibacterial activities. The particles were agglomerated as observed by SEM micrographs. The particles were homogeneous, spherical in shape and loosely agglomerated as seen by TEM pictures. The antibacterial activity of the synthesized multi-metallic nanoparticles against B. cereus, S. aureus, E. coli and P. aeuroginosa was demonstrated using the zone of inhibition technique. The synthesized multi-metallic nanoparticle can find plausible biological applications.

2021 ◽  
Vol 11 (5) ◽  
pp. 13573-13586

This study evaluated the efficacy of antibacterial activities for a zeolite A (ZEO) sample loaded with streptomycin (STR). The ZEO was synthesized from kaolinite (KAO) via the alkaline hydrothermal process and verified with various techniques, such as X-ray Diffraction, Fourier-Transform Infrared spectroscopy, Field Emission Scanning Electron Microscopy with Energy Dispersive X-ray, Transmission Electron Microscopy, and dispersion behavior to confirm the production of ZEO with high purity and reproducibility. The cubic framework of ZEO was maintained after the immobilization of STR, indicating STR molecules' adsorption on the ZEO surface. The STR-loaded ZEO (ZS) samples were prepared in three STR concentrations (50, 100, and 200 mg/L). The samples' antibacterial activity was determined using the disc diffusion technique and minimum inhibition concentration against Gram-negative bacteria (Escherichia coli ATCC 11229) and Gram-positive bacteria (Staphylococcus aureus ATCC 6538). Both bacteria were susceptible to ZS, which showed an antibacterial effect directly proportional to the STR concentration. Thus, the synthesized ZEO synthesized from natural KAO had a good prospect as a carrier system for STR for generating a broad spectrum of antibacterial activity.


2016 ◽  
Vol 723 ◽  
pp. 444-449 ◽  
Author(s):  
Juan Chen ◽  
Zhi Liang Huang ◽  
Wen Zhao Li

The porous basic magnesium carbonate (Mg5(CO3)4(OH)2.4H2O) crystal crystallographic materials with flower-like structure were prepared successfully by homogeneous precipitation method. Magnesium chloride hexahydrate (MgCl2.6H2O) and urea (CO(NH2)2) wereused as reaction materials. The experimental equipment was held at 100°C for 8 h. Phase and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The formation mechanism of the product was investigated. It was found that the CO2 bubbles acted as porous templates. The growth and gathering of the CO2 bubbles induced the growth of the MgCO3.3H2O columnar crystals. Then the dissolution of the MgCO3.3H2O and the deposition of Mg5(CO3)4(OH)2.4H2O happened simultaneously. Finally the disappearance of MgCO3.3H2O brought about the formation of the porous structure.


CrystEngComm ◽  
2014 ◽  
Vol 16 (47) ◽  
pp. 10837-10844 ◽  
Author(s):  
S. Frykstrand ◽  
C. Strietzel ◽  
J. Forsgren ◽  
J. Ångström ◽  
V. Potin ◽  
...  

The first electron microscopy images of the peculiar oxymagnesite crystal are presented along with the synthesis description and crystallographic data.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mohib Ullah Kakar ◽  
Khakemin Khan ◽  
Muhammad Akram ◽  
Rokayya Sami ◽  
Ebtihal Khojah ◽  
...  

AbstractThis study was designed to preparecarboxyl-functionalized poly (N-isopropylacrylamide) PNIPAM microgels having excellent catalytic properties.Recently, researchers are trying to fabricate cost effective and efficient hybrid catalytic materials for the synthesis of nitrogenous compounds along with enhanced optical properties. For the same motive, synthesis of carboxyl-functionalized PNIPAM microgels was performed by using polymerization of soap-free emulsion of N-isopropyl acrylamide, which is NIPAM along with acrylic acid (AA). The thiol group was introduced through the imide bond mediated by carbodiimide, between carboxyl-functionalized microgels through carboxyl group and aminoethanethiol (AET). Copper, Palladium and Cu/Pd nanoparticles were incorporated successfully into thiol-functionalized PNIPAM microgels through metals thiol linkage. The synthesized microgels and hybrid encompassing metallic nanoparticles were characterized in detail by using Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron (XPS) and Fourier transformed infrared spectroscopy for structural interpretation. The thermal properties of the pure and hybrid microgels were inspected by TG analysis. The prepared nanocomposites PNIPAM-Cu, PNIPAM-Pd and PNIPAM-Cu/Pd exhibited decent catalytic properties for the degradation of 4-Nitrophenol and methylene blue, but the bimetallic Cu/Pd have remarkable catalytic properties. The catalytic reaction followed pseudo-first-order reaction with rate constants 0.223 min−1, 0.173 min−1 for 4-Nitrophenol and methylene blue in that order. In this study,we were able to establish that Cu/Pd hybrid is an efficient catalyst for 4-Nitrophenol and methylene blue as compared to its atomic analogue.


2021 ◽  
Vol 21 (10) ◽  
pp. 5131-5142
Author(s):  
Leila Shirmohammadzadeh ◽  
Hadi Fallah Moafi ◽  
Abdollah Fallah Shojaei

In this research, strontium titanate (SrTiO3), barium titanate (BaTiO3), barium strontium titanate (BaSrTiO3), and Ag-doped BaSrTiO3 nanocomposites with different Ag contents were fabricated using the sol–gel chemical route. The prepared samples were characterized by several techniques including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), differential reflectance spectroscopy (DRS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), inductively coupled plasma spectroscopy (ICP), and Brunauer-Emmett-Teller (BET) measurement. The EDS results indicated that the synthesized nanoparticles had a cube perovskite-like structure. The EDS and ICP results revealed that Ag was doped into the Ba0.5Sr0.5TiO3 structure. The SEM and TEM images demonstrated that the particle size of 15 mol% Ag-doped Ba0.5Sr0.5TiO3 was smaller than that of pure Ba0.5Sr0.5TiO3 as confirmed by surface area results. The photocatalytic properties of undoped titanate samples and Ag-doped Ba0.5Sr0.5TiO3 were studied by the photodecomposition of Eosin yellowish (EY) and methylene blue (MB) dyes. The results illustrated that the photodegradation efficiency of the Ag-doped Ba0.5Sr0.5TiO3 was far higher than the undoped titanate sample, and the optimum Ag doping was 15 mol%. The antibacterial activities of pure Ba0.5Sr0.5TiO3 and Ag-doped Ba0.5Sr0.5Ti03 were studied against Staphylococcus aureus as Gram-positive (+) and Pseudomonas aeruginosa and Escherichia coli as Gram-negative (−) bacteria. In comparison with the bare Ba0.5Sr0.5TiO3 nanoparticles, the Ag-doped sample showed a significant enhancement in antibacterial activities against both Gram-negative and Gram-positive bacterial strains.


2011 ◽  
Vol 233-235 ◽  
pp. 2687-2691
Author(s):  
Min Guo ◽  
Tan Guo ◽  
Quan Li ◽  
Zhi Jian Wu

Magnesium carbonate precipitation by the reaction of MgCl2 with Na2CO3, using sodium tartrate as an additive was studied. The effects of sodium tartrate concentration, reaction temperature, and stirring speed on the precipitation were investigated comprehensively. Scanning electron microscopy (SEM) and X-ray powder diffraction methods were used to characterize the carbonate precipitate products. Sodium tartrate concentration, reaction temperature, and stirring speed have significant effects on the morphology of the carbonate products. Sodium tartrate has an inhibitive effect on the precipitation. The product weight decreases with the increase in the amount of sodium tartrate added, and with the increase in reaction temperature, but is almost irrelevant to the stirring speed. The products obtained at 25 and 50°C were all identified as nesquehonite. The experimental results show that the use of an additive would be an effective method to adjust the morphology of magnesium carbonate.


Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2859 ◽  
Author(s):  
Dinesh Lolla ◽  
Ahmed Abutaleb ◽  
Marjan A. Kashfipour ◽  
George G. Chase

Molecular scale modifications were achieved by spontaneous polarization which is favored in enhancements of β-crystallization phase inside polyvinylidene fluoride (PVDF) nanofibers (NFs). These improvements were much more effective in nano and submicron fibers compared to fibers with relatively larger diameters. Metallic nanoparticles (NPs) supported by nanofibrous membranes opened new vistas in filtration, catalysis, and serving as most reliable resources in numerous other industrial applications. In this research, hydrogenation of phenol was studied as a model to test the effectiveness of polarized PVDF nanofiber support embedded with agglomerated palladium (Pd) metallic nanoparticle diameters ranging from 5–50 nm supported on polymeric PVDF NFs with ~200 nm in cross-sectional diameters. Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), Energy Dispersive X-Ray Spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FTIR) and other analytical analysis revealed both molecular and surface morphological changes associated with polarization treatment. The results showed that the fibers mats heated to their curie temperature (150 °C) increased the catalytic activity and decreased the selectivity by yielding substantial amounts of undesired product (cyclohexanol) alongside with the desired product (cyclohexanone). Over 95% phenol conversion with excellent cyclohexanone selectivity was obtained less than nine hours of reaction using the polarized PVDF nanofibers as catalytic support structures.


2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Van-Dat Doan ◽  
Bao-An Huynh ◽  
Thanh-Danh Nguyen ◽  
Xuan-Thang Cao ◽  
Van-Cuong Nguyen ◽  
...  

In this study, biogenic silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized by a green approach using an aqueous extract from Codonopsis pilosula (CP) roots as a reducing and stabilizing agent. The formation of CP-AgNPs and CP-AuNPs was confirmed and optimized by UV-Vis spectroscopy. The CP-AgNPs and CP-AuNPs obtained under optimum conditions of metal ion concentration, reaction temperature, and reaction time were characterized by high-resolution transition electron microscopy (HR-TEM), selected area electron diffraction (SAED) analysis, field-emission scan electron microscopy (FE-SEM), powder X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, dispersive X-ray spectroscopy (EDX), and dynamic light scattering (DLS) method. It has been found that the biosynthesized CP-AgNPs and CP-AuNPs were formed in spherical shape with an average size of 10±2.5 nm and 20±3.2 nm, respectively. The biosynthesized metallic nanoparticles exhibited selective bacterial activity against three bacterial strains including two Gram-positive bacteria of Bacillus subtilis and Staphylococcus aureus and one Gram-negative bacteria of Escherichia coli. Meanwhile, there was no antibacterial activity detected toward Gram-negative Salmonella enteritidis. CP-AgNPs and CP-AuNPs also manifested an excellent catalytic performance in the reduction of 1,4-dinitrobenzene, 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol.


2000 ◽  
Vol 647 ◽  
Author(s):  
O. Cíntora-González ◽  
C. Estournès ◽  
D. Muller ◽  
M. Richard-Plouet ◽  
A. Traverse ◽  
...  

AbstractThe structural and magnetic properties of nano-sized particles of transition metals (Co and Ni) implanted into amorphous SiO2 are investigated. The SiO2 substrates used were as grown on a silicon (100) wafer under wet O2 atmosphere. The metals were implanted as singly charged atoms energized to 30 or 160 keV. Transmission Electron microscopy (TEM) observations and X-ray absorption spectroscopy (XAS) show that M+ implantation results in the formation of metallic nanoparticles at the vicinity of the surface whereas oxide particles (< 1 nm) are formed in a deeper region. After thermal treatment under hydrogen, TEM evidences the disappearance of the oxide region and an increase in the size of the metallic particle. XAS shows that cobalt and nickel are entirely in the metallic form and saturation magnetization becomes close to the theoretical value.


2018 ◽  
Vol 10 (3) ◽  
pp. 422-428 ◽  
Author(s):  
Pannerselvam Balashanmugam ◽  
Hyung Joo Kim ◽  
Vijay Singh ◽  
Rangarajulu Senthil Kumaran

The synthesis of metallic nanoparticles using plant extracts has attracted much attention. In this study, silver nanoparticles (AgNPs) were synthesized using the Ginkgo biloba plant-leaf extract and their antibacterial and larvicidal activities were investigated. AgNPs were characterized using UV-visible, X-ray diffraction (XRD), Fourier transform infrared (FTIR), energy-dispersive X-ray (EDX) spectroscopy and field emission scanning electron microscope (FESEM) analysis. The UV-visible spectral analysis showed a surface plasmon resonance (SPR) peak at 430 nm, the FESEM analysis revealed size of AgNPs between 25–45 nm and the XRD data confirmed the formation of the AgNPs using G. biloba-mediated green synthesis. AgNPs showed the highest antibacterial activities against Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus subtills, Enterobacter aerogens, Salmonella paratyphi and Escherichia coli. Also, the AgNPs exerted a significant larvicidal effect on the Culex mosquito larvae.


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