Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Salam (Syzygium polyanthum) Sebagai Bioreduktor Dan Uji Aktivitasnya Sebagai Antioksidan

Silver nanoparticles have been synthesized by the reduction method using salam leaf extract (Syzygium polyanthum) as a reducing agent. The silver nanoparticles produced were then tested for their activity as antioxidants. The formation of silver nanoparticles was carried out by adding the leaf extract into the solution of AgNO3 and homogenized using a magnetic stirrer. A UV-Vis spectrophotometer was used to confirm the formation of silver nanoparticles. Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Diffractometer (XRD) and Fourir Transform Infra Red (FTIR) spectrometers were used to characterize the nanoparticles produced before being tested for antioxidant activity. The results showed that the absorbance value increased with increasing reaction contact time. The maximum uptake was obtained at wavelengths of 432-446 nm using a UV-Vis spectrophotometer. The particle size was determined using a PSA with an average particle size distribution of 45.7 nm. The average diameter of silver nanoparticles was 10.06 – 13.97 nm and the silver nanoparticles had rod-shapes. Functional groups that play a role in the synthesis of nanoparticles were –OH, –C=O, and –C-O groups. Silver nanoparticles inhibited free radicals as antioxidants with the IC50 value of 582.7 ppm.

Download Full-text

Antibacterial and Antioxidant Studies of Green Synthesized Silver Nanoparticles using Azadirachta indica (Neem) Leaf Extract

International Journal of Applied Sciences and Biotechnology ◽

10.3126/ijasbt.v9i3.39069 ◽

2021 ◽

Vol 9 (3) ◽

pp. 220-226

Author(s):

Bishow Regmi ◽

Tirtha Raj Binadi ◽

Sarb Narayan Jha ◽

Rajib Kumar Chaudhary ◽

Bhoj Raj Poudel ◽

...

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Azadirachta Indica ◽

Leaf Extract ◽

Average Particle Size ◽

Diffusion Method ◽

Average Particle ◽

Face Centered Cubic ◽

X Ray ◽

Uv Visible

Silver nanoparticles (AgNPs) have been synthesized by green synthesis using Azadirachta indica leaf extract as both reducing and stabilizing agent. Synthesis of colloidal AgNPs was monitored by UV- visible spectroscopy. The UV- visible spectrum showed a peak at 455 nm corresponding to the plasmon absorbance of the silver nanoparticles. Crystallite structure of silver nanoparticles was studied using X-ray diffraction (XRD) analysis which revealed the face-centered cubic structure (FCC) with average particle size of 8.9 nm, calculated using Debye-Scherrer’s equation. Transmission electron microscopy (TEM) image revealed the agglomeration of small grain with particle size ranging from 2 to 14 nm. FCC crystalline nature was also evident from selected area electron diffraction (SAED) analysis. High purity of as-synthesized AgNPs was analyzed using energy dispersive X-ray (EDX) spectroscopy. Band gap energy was calculated to be 2.7 eV from UV- Visible spectra. 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay was stabilized by AgNPs which reveals its antioxidant efficacy. Well diffusion method showed 7 mm to 12 mm zone of inhibition (ZOI) against Gram-positive and Gram-negative bacteria, respectively confirming the antibacterial potential of AgNPs. Int. J. Appl. Sci. Biotechnol. Vol 9(3): 220-226.

Download Full-text

Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Kluwak Pangium edule Reinw Sebagai Bioreduktor dan Uji Aktivitasnya Sebagai Antioksidan

Jurnal Ilmu Alam dan Lingkungan ◽

10.20956/jal.v10i1.6557 ◽

2019 ◽

Vol 10 (1) ◽

Author(s):

Indrawati Patabang ◽

Syahruddin Kasim ◽

Paulina Taba

Keyword(s):

Antioxidant Activity ◽

Particle Size ◽

Silver Nanoparticles ◽

Leaf Extract ◽

Average Particle Size ◽

Xrd Analysis ◽

Average Particle ◽

Result Show ◽

Ic50 Values ◽

Show Result

Silver nanoparticles have been synthesized using kluwak leaf extract (Pangium edule Reinw) as bioreductor and antioxidant activity assay. The nanoparticles formed were monitored by observing UV-Vis absorption and characterized by using FTIR, PSA, XRD and SEM instruments. The result of functional group characterization with FTIR show that the functional groups OH, C = O, C-O and CH2 act as Ag+ reducing agent. The size of silver nanoparticles was determined by using Particle Size Analyzer (PSA) and the result show average particle size distribution of 93.2 nm. Morphology of AgNp were observed by Scanning Electron Microscope (SEM) and X-Ray Difraction (XRD) analysis show result of 51,78 nm. The antioxidant activity was shown by in kluwak leaf extract and silver nanoparticles with IC50 values respectively 831,33 ppm dan 1493,09 ppm.

Download Full-text

Preparation of ultrafine iron phosphate micro-powder from phosphate slag

MATEC Web of Conferences ◽

10.1051/matecconf/201823802002 ◽

2018 ◽

Vol 238 ◽

pp. 02002

Author(s):

Fangjing Sun ◽

Yi Zhang ◽

Jiawei Zhang ◽

Xixi Yan ◽

Xiaoyu Liu ◽

...

Keyword(s):

Aqueous Solution ◽

Particle Size ◽

Electron Microscope ◽

Average Particle Size ◽

Iron Phosphate ◽

Average Particle ◽

X Ray ◽

Particle Size Analyzer ◽

Phosphate Slag ◽

Scanning Electron

In this experiment, ultrafine iron phosphate micro-powder was prepared by hydrothermal method which used phosphate slag as an iron source. The effects of reaction temperature, surfactants type and amount on its particle size were explored. The samples were characterized by using Malvern Laser Particle Size Analyzer (MS2000), X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Spectroscopy (EDX).The results showed that at 160 °C, 1 wt%CTAB, monoclinic iron phosphate micro-powder was obtained with an average particle size about 0.4 μm which also has a good dispersion in aqueous solution.

Download Full-text

Sargassum Influx on the Mexican Coast: A Source for Synthesizing Silver Nanoparticles with Catalytic and Antibacterial Properties

Applied Sciences ◽

10.3390/app11104638 ◽

2021 ◽

Vol 11 (10) ◽

pp. 4638

Author(s):

Jose Luis López-Miranda ◽

Rodrigo Esparza ◽

Marlen Alexis González-Reyna ◽

Beatriz Liliana España-Sánchez ◽

Angel Ramon Hernandez-Martinez ◽

...

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Average Particle Size ◽

Antibacterial Properties ◽

Average Particle ◽

X Ray Diffraction ◽

X Ray ◽

Experimental Parameters ◽

First Time

This work reports, for the first time, the synthesis of silver nanoparticles using extracts of the species of Sargassum natans and Sargassum fluitans (AgNPs-S). Their antibacterial and catalytic properties are compared with silver nanoparticles obtained by chemical synthesis (AgNPs-C). The characterization of AgNPs-S and AgNPs-C was carried out using ultraviolet–visible spectroscopy (UV–Vis), dynamic light scattering (DLS), zeta potential, a scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis. The synthesis of silver nanoparticles using Sargassum extract was optimized through varying experimental parameters, such as the type of solvent used to prepare the extract, the volume of the extract, and the pH of the system. The most efficient sample (AgNPs-S) was prepared with a water–ethanol-based extract, using a 3:1 volumetric ratio of extract: a precursor salt with the addition of 1 mL of NaOH pH = 14. The AgNPs-C were spherical in shape, with an average particle size of 11.55 nm, while the AgNPs-S were polyhedral shaped, with an average particle size of 26.39 nm. The synthesized AgNPs-S were found to have significantly higher catalytic activity for the degradation of methylene blue and more effective antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa than AgNPs-C.

Download Full-text

Characterization, Antimicrobial and Antioxidant evaluation of biofabricated silver nanoparticles from endophytic Pantoea anthophila

10.21203/rs.3.rs-205396/v1 ◽

2021 ◽

Author(s):

C. Nirmala ◽

M Srid

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Electron Microscope ◽

Pathogenic Bacteria ◽

Average Particle Size ◽

Antioxidant Properties ◽

Radical Scavenging ◽

Average Particle ◽

X Ray ◽

Uv Visible

Abstract Endophyte mediated nanoparticles fabrication was emerging as a new frontier in nanomedicines that produce high biocompatible and functionalized silver nanoparticles. In this study, silver nanoparticles were successfully biosynthesized from the extracellular extract of endophytic bacterium Pantoea anthophila isolated from the stem of Waltheria indica for the first time. The synthesised nanoparticles were characterized by UV-Visible and Fourier Transform Infra-Red spectroscopy. The structural analysis is done by X-ray diffraction and the stability was studied by dynamic light scattering and particle size analyser. The size and shape were observed by Transmission Electron Microscope, Scanning Electron Microscope and Energy Dispersive X-Ray spectrum. Further, the nanoparticles were evaluated for antimicrobial and antioxidant properties. Synthesized nanoparticle showed a strong absorption band in the UV-Visible range at 410 nm. The average particle size was found to be 16.8 nm with spherical shaped, crystalline nature. Good zones of inhibition at various ranges were detected against a broad range of human pathogenic bacteria and fungi. A strong free radical scavenging activity of silver nanoparticles with IC50 values 30.75, 19.47, 34.59, 41.12, 27.24, 28.16, 36.21 µg/ml was obtained that was comparable to the reference. The study suggests that the silver nanoparticles can be biosynthesised from endophytic P. anthophila metabolites with significant therapeutic potential. With proper validation, the biosynthesised silver nanoparticles can be developed as a promising antiviral and anticancer drug candidate.

Download Full-text

Preparation and Characterization of ZrO2 Nano-Particles by Supercritical Hydrolysis Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.979 ◽

2011 ◽

Vol 347-353 ◽

pp. 979-983

Author(s):

Jing Zhi Jiang ◽

Pei Ying Peng ◽

Hai Ting Cui ◽

Zhi Yi Li

Keyword(s):

Particle Size ◽

Average Particle Size ◽

Average Diameter ◽

Nano Particles ◽

Average Particle ◽

Total Flow ◽

Operation Temperature ◽

Hydrolysis Process ◽

Particle Size Analyzer ◽

Operation Pressure

ZrO2 nano-particles were successfully prepared by supercritical hydrolysis in two steps (hydrolysis and dehydration) and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle-size analyzer. The influences of operation parameters, including operation pressure and temperature, CO2 total flow and ratio of CO2 branch flow, on the particles were investigated experimentally. The results show that average particle size increases with the increase of the operation temperature, while it decreases with the increase of the operation pressure and the CO2 total flow. The smallest particles with average diameter of 793nm can be prepared under the condition: operation temperature and pressure of 50°C and 8MPa, CO2 total flow of 30 standard cubic centimeter per Minute and ratio of CO2 branch flow of 3.

Download Full-text

Thermal, Structural, and Physical Properties of Freeze Dried Tropical Fruit Powder

Journal of Food Processing ◽

10.1155/2014/524705 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 11

Author(s):

K. A. Athmaselvi ◽

C. Kumar ◽

M. Balasubramanian ◽

Ishita Roy

Keyword(s):

Particle Size ◽

Physical Properties ◽

Average Particle Size ◽

Average Particle ◽

X Ray Diffraction ◽

Tropical Fruit ◽

X Ray ◽

Freeze Dried ◽

Fruit Powder ◽

Lcr Meter

This study evaluates the physical properties of freeze dried tropical (guava, sapota, and papaya) fruit powders. Thermal stability and weight loss were evaluated using TGA-DSC and IR, which showed pectin as the main solid constituent. LCR meter measured electrical conductivity, dielectric constant, and dielectric loss factor. Functional groups assessed by FTIR showed presence of chlorides, and O–H and N–H bonds in guava, chloride and C–H bond in papaya, and chlorides, and C=O and C–H bonds in sapota. Particle size and type of starch were evaluated by X-ray diffraction and microstructure through scanning electronic microscopy. A semicrystalline profile and average particle size of the fruit powders were evidenced by X-ray diffraction and lamellar/spherical morphologies by SEM. Presence of A-type starch was observed in all three fruits. Dependence of electric and dielectric properties on frequency and temperature was observed.

Download Full-text

Fe3O4 Magnetic Preparation by Bauxite Ore Washing Fine Mud

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.961 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 961-965

Author(s):

Jian Qiang Xiao ◽

Guo Wei He ◽

Yan Jin Hu

Keyword(s):

Particle Size ◽

Aging Time ◽

Average Particle Size ◽

Xrd Analysis ◽

Test Methods ◽

Raw Material ◽

Molar Ratio ◽

Average Particle ◽

Experimental Conditions ◽

Particle Size Analyzer

Bauxite waste sludge as a raw material, the use of reverse chemical coprecipitation synthesize Fe3O4. Researching temperature, precipitation concentration, aging time and Fe2+/Fe3+ molar ratio effect on the particle size, morphology. Optimal experimental conditions: temperature 70 °C, the precipitant NaOH mass ratio of 10%, aging time 3h, Fe2+/Fe3+ molar ratio of 2:3. Test methods using a laser particle size analyzer, XRD analysis of the products were characterized, the product is Fe3O4, the average particle size of 0.11mm.

Download Full-text

Changes in Particle Size Distributions on a Fixed Bed of Granular Activated Carbon

Water Science & Technology ◽

10.2166/wst.1986.0004 ◽

1986 ◽

Vol 18 (1) ◽

pp. 31-42 ◽

Cited By ~ 6

Author(s):

E. A. Shpirt ◽

K. T. Alben

Keyword(s):

New York ◽

Particle Size ◽

Activated Carbon ◽

Average Particle Size ◽

Fixed Bed ◽

Treatment Plant ◽

Granular Activated Carbon ◽

Water Treatment Plant ◽

Average Diameter ◽

Average Particle

The particle size distribution at different bed depths of a fixed bed of granular activated carbon (GAC) has been monitored during 50 weeks of a pilot column run at the Waterford, New York potable water treatment plant. Initial backwashing resulted in significant stratification of GAC in the column: larger particles (average diameter 1.18 mm) settled in the bottom of the column (105 cm), and smaller particles (average diameter 0.97 mm) were concentrated near the top (24 cm), compared to samples of unstratified virgin Calgon F400 (average diameter 1.09 mm). During column loading and initial backwashing, more fines were created than were present in the virgin GAC (average 6.5% of GAC fines in the > 40 mesh fraction, compared to only 0.3% in the > 40 mesh fraction for virgin Calgon F400). After 50 weeks of service there was an overall trend toward a smaller average particle size (0.9 mm) with development of a more regular pattern of bed stratification (1.08 mm at the bottom and 0.75 mm at the top). These changes are attributed to breaking of large particles (12-20 mesh) and creation of intermediate size particles (20-30 and 30-40 mesh).

Download Full-text

Facile Synthesis and Characterization of Fe-Co Nanoparticles Supported Silica Rice Husk

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.709.66 ◽

2016 ◽

Vol 709 ◽

pp. 66-69

Author(s):

Jeyashelly Andas ◽

Rahmah Atikah Rosdi ◽

Nur Izzati Mohd Anuar

Keyword(s):

Particle Size ◽

Rice Husk ◽

Sol Gel ◽

Average Particle Size ◽

Average Particle ◽

Silica Source ◽

Transmission Electron ◽

Particle Size Analyzer ◽

Bimetallic Materials ◽

Co Nanoparticles

A series of Fe-Co nanoparticles were synthesized via sol-gel route at acidic, neutral and basic condition using rice husk as the silica source. The synthesized nanomaterials were designated as Fe-Co3, Fe-Co7 and Fe-Co9 and characterized by Fourier Transform Infrared (FTIR), Transmission Electron Microscope (TEM) and particle size analyzer. The great effect of pH was clearly evidenced from the shifting in the siloxane bond in the FTIR spectrum. TEM investigation confirmed the existence of discrete and almost sphere like nanoparticles. The particle size decreased with an increase in the pH, registering the smallest average particle size at pH 9. In brief, this study promises a fast, rapid and promising method for the conversion of silica rice husk into nanoscale bimetallic materials.

Download Full-text