scholarly journals Synthesis and Application of Nanomagnetic Immobilized Phospholipase C

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Yang Jiang ◽  
Jing Du ◽  
Honglin Tang ◽  
Xin Zhang ◽  
Wenbin Li ◽  
...  
Keyword(s):  
Phospholipase C ◽  
Soybean Lecithin ◽  
Average Particle Size ◽  
Average Particle ◽  
Initial Activity ◽  
Enzyme Loading ◽  
Specific Saturation Magnetization ◽  
Ft Ir ◽  
Ir Analysis ◽  
Enzyme Dosage

The nanomagnetic carrier (Fe3O4@SiO2@p(GMA)) was prepared by atom transfer radical polymerization, and then, the free phospholipase C (PLC) was immobilized on it proved by the results of FT-IR analysis. The enzyme loading was 135.64 mg/g, the enzyme activity was 8560.7 U/g, the average particle size was 99.86 ± 0.80 nm, and the specific saturation magnetization was 16.00 ± 0.20 emu/g. PLC-Fe3O4@SiO2@p(GMA) showed the highest activities at the pH of 7.5, and tolerance temperature raised to 65°C in soybean lecithin emulsion. Enzymatic degumming with PLC-Fe3O4@SiO2@p(GMA) under the conditions of the enzyme dosage of 110 mg/kg, reaction temperature of 65°C, pH of 7.5, and reaction time of 2.5 h resulted in residual phosphorus of 64.7 mg/kg, 1,2-diacylglycerol (1,2-DAG) contents of 1.07%, and oil yield of 98.1%. Moreover, PLC-Fe3O4@SiO2@p(GMA) still possessed more than 80% of its initial activity after 5 cycles.

scholarly journals Influence of Fe3+ Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide

2016 ◽  
Vol 67 ◽  
pp. 9-13 ◽  
Author(s):  
Shirajahammad M. Hunagund ◽  
Pradeep Chavan ◽  
Vani R. Desai ◽  
L.R. Naik ◽  
Jagadish S. Kadadevarmath ◽  
...  
Keyword(s):  
Average Particle Size ◽  
Solid State Reaction Method ◽  
Dielectric Behavior ◽  
Average Particle ◽  
Dielectric Characteristics ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ion Substitution ◽  
Ft Ir ◽  
Ir Analysis

Thermal and dielectric characteristics of Fe2O3doped TiO2(FDT) nanopowder is investigated. Formation of FDT was prepared using the formula [1-x] TiO2+ [x] Fe2O3by solid state reaction method. The Surface morphology was studied using atomic force microscopy (AFM) technique; it reveals the average particle size in the range of 180 to 200nm. FT-IR analysis reveals weak transmittance bands between 1020 to 1650 cm-1and 2800 to 3500 cm-1which shows a gradual decrease in peak intensities with an increase of Fe concentration. Thermal stability was assessed by Thermogravimetric analysis (TGA). Results of TGA Profiles indicate that all FDT nanopowder was found to be thermally stable between 400 °C to 600 °C. The dielectric behavior of the said composite has been investigated as a function of frequency (20 Hz - 1 MHz) at room temperature and it is observed that the dielectric constant decreases with increasing frequency indicating dispersion behavior.

scholarly journals Water-Dispersible Phytosterol Nanoparticles: Preparation, Characterization, and in vitro Digestion

2022 ◽  
Vol 8 ◽  
Author(s):  
Ao Li ◽  
Aixia Zhu ◽  
Di Kong ◽  
Chunwei Wang ◽  
Shiping Liu ◽  
...  
Keyword(s):  
Particle Size ◽  
Soybean Lecithin ◽  
Average Particle Size ◽  
Soy Protein Isolate ◽  
In Vitro Digestion ◽  
Bimodal Distribution ◽  
Average Particle ◽  
Food Ingredients ◽  
The Impact

For improving solubility and bioaccessibility of phytosterols (PS), phytosterol nanoparticles (PNPs) were prepared by emulsification–evaporation combined high-pressure homogenization method. The organic phase was formed with the dissolved PS and soybean lecithin (SL) in anhydrous ethanol, then mixed with soy protein isolate (SPI) solution, and homogenized into nanoparticles, followed by the evaporation of ethanol. The optimum fabrication conditions were determined as PS (1%, w/v): SL of 1:4, SPI content of 0.75% (w/v), and ethanol volume of 16 ml. PNPs were characterized to have average particle size 93.35 nm, polydispersity index (PDI) 0.179, zeta potential −29.3 mV, and encapsulation efficiency (EE) 97.3%. The impact of temperature, pH, and ionic strength on the stability of fabricated PNPs was determined. After 3-h in vitro digestion, the bioaccessibility of PS in nanoparticles reached 70.8%, significantly higher than the 18.2% of raw PS. Upon freeze-drying, the particle size of PNPs increased to 199.1 nm, resulting in a bimodal distribution. The solubility of PS in water could reach up to 2.122 mg/ml, ~155 times higher than that of raw PS. Therefore, this study contributes to the development of functional PS-food ingredients.

scholarly journals Investigation on room temperature photoluminescence of pure and aluminum doped zinc oxide nanoparticles

2015 ◽  
Vol 33 (1) ◽  
pp. 205-212 ◽  
Author(s):  
N. Srinivasan ◽  
J.C. Kannan
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Hexagonal Wurtzite Structure ◽  
Spectral Studies ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
Ir Studies ◽  
Aluminum Doped Zinc Oxide ◽  
Ft Ir

AbstractPure and aluminum doped zinc oxide nanoparticles were prepared by soft chemical method. The prepared nanoparticles were characterized by XRD, SEM-EDAX, UV-Vis, PL and FT-IR studies. XRD patterns revealed that the nanoparticles were crystallized in hexagonal wurtzite structure with an average particle size of 19 nm to 26 nm. The surface morphology was explored using SEM micrographs. The incorporation of aluminum was confirmed by EDAX and FT-IR studies. The band gaps of the particles were found from 3.48 eV to 3.53 eV through UV-Vis spectral studies. The defect related mechanism was investigated using PL measurements. The chemical functional groups in FT-IR spectra proved the formation of pure and aluminum doped zinc oxide nanoparticles.

The Utilization of Ground Tire Rubber as Ion Exchange Materials

2018 ◽  
Vol 382 ◽  
pp. 352-356 ◽  
Author(s):  
Supitcha Rungrodnimitchai ◽  
Sirinapa Mayod ◽  
Sutamma Tanasarn
Keyword(s):  
Reaction Time ◽  
Ion Exchange ◽  
Average Particle Size ◽  
Average Particle ◽  
Sem Images ◽  
Carboxyl Content ◽  
Tire Rubber ◽  
Ground Tire Rubber ◽  
Chemically Modified ◽  
Ft Ir

In this study, ground tire rubber (R-GTR) with the average particle size of 456 µm was chemically modified to produce modified ground tire rubber (M-GTR) that can work as ion exchange materials. The modification was performed by oxidation reaction. The ground tire rubber was oxidized at the range of temperature from 20 to 40๐C for 48, 72 and 96 hours by a mixture of the HNO3/H3PO4/NaNO2system. The HNO3/H3PO4ratio was 1:3 and the concentration of NaNO2was 1.4% w/v. FT-IR revealed that the carboxyl group or the carbonyl group was successfully introduced into the modified ground tire rubber and SEM images demonstrated that the porosity of modified ground tire rubber increased. The results of the modified ground tire rubber showed that the carboxyl content increased with an increase of reaction time while %yield decreased with an increase of reaction time. The optimum condition for modification was the reaction at 30๐C for 96 hours.

Biosynthesis and Characterization of Copper Nanoparticles Using a Bioflocculant Extracted from Alcaligenis faecalis HCB2

2019 ◽  
Vol 11 (11) ◽  
pp. 1064-1070 ◽  
Author(s):  
Nkosinathi G. Dlamini ◽  
Albertus K. Basson ◽  
V. S. R. Rajasekhar Pullabhotla
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Copper Nanoparticles ◽  
Average Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Average Particle ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir

Bioflocculant from Alcaligenis faecalis HCB2 was used in the eco-friendly synthesis of the copper nanoparticles. Nanoparticles were characterized using a scanning electron microscope (SEM), transmission electron microscopy (TEM), UV-visible spectroscopy, thermo gravimetric analysis (TGA) and Fourier Transform Infrared Spectroscopy (FT-IR). The transmission electron microscopy images showed close to spherical shapes with an average particle size of ∼53 nm. Energy-dispersive X-ray spectroscopy analysis confirmed the presence of the Cu nanopartilces and also the other elements such as O, C, P, Ca, Cl, Na, K, Mg, and S originated from the bioflocculant. FT-IR results showed the presence of the –OH and –NH2 groups, aliphatic bonds, amide and Cu–O bonds. Powder X-ray diffraction peaks confirmed the presence of (111) and (220) planes of fcc structure at 2 of 33° and 47° respectively with no other impurity peaks.

scholarly journals Spectral and Thermal Degradation of Melamine Cyanurate

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
V. Sangeetha ◽  
N. Kanagathara ◽  
R. Sumathi ◽  
N. Sivakumar ◽  
G. Anbalagan
Keyword(s):  
Grown Crystal ◽  
Cyanuric Acid ◽  
Average Particle Size ◽  
Exothermic Peak ◽  
Average Particle ◽  
Good Thermal Stability ◽  
Melamine Cyanurate ◽  
Ft Ir ◽  
Diffraction Peaks ◽  
Scherrer Formula

Melamine cyanurate, an organic crystalline complex was, synthesized by evaporation of an aqueous solution containing equimolar quantities of melamine and cyanuric acid. The synthesized compound has been subjected to various characterizations like Powder XRD, FT-IR, TG-DTG, SEM, and SHG. The presence of sharp diffraction peaks in the XRD confirms that the products are highly crystalline. The average particle size was calculated using the Debye-Scherrer formula, and it was found to be 3.067 μm. Thermal behavior of the grown crystal has been studied by TG-DTG analysis. From TG-DTG, it is found that the title crystal possesses good thermal stability. The activation energy was calculated using the Broido, Coats-Redfern, and Horowitz-Metzger methods. A sharp peak exothermic peak at 405.40°C was assigned as the melting point of the title material. SEM reveals the morphology of the synthesized salt. No detectable signal was observed during the Kurtz-Perry technique.

scholarly journals Biosynthesis of Gold Nanoparticles by Essential Oil of Diplotaxis Acris Characterization and Antimicrobial Activities

2021 ◽  
Vol 37 (2) ◽  
pp. 405-412
Author(s):  
Mohamed Habib Oueslati ◽  
Lotfi Ben Tahar ◽  
A. Khuzaim Alzahrani ◽  
Jamith Basha ◽  
Omar H. Abd Elkader
Keyword(s):  
Essential Oil ◽  
Average Particle Size ◽  
Antimicrobial Activities ◽  
Nano Particles ◽  
Average Particle ◽  
Tem Analysis ◽  
Stabilizing Agents ◽  
E Coli ◽  
Ft Ir ◽  
Plausible Scheme

The present work reports a green biosynthesis of gold nano particles (EO-AuNPs) using an essential oil (EO) as a reducing agent of the Au(III) in HAuCl4. The EO was extracted by hydro-distillation from Diplotaxis acris flowers. A total of 16 compounds were detected from the EO oil by using GC–MS and 5-methylsulfanylpentanenitrile was identified as the major component (73.60 %). The biosynthesized EO-AuNPs were characterized performing UV–Vis, IR,XRD and TEM analyses.The UV-Vis revealed the typical features of surface plasmon resonance (SPR) of AuNPs at ~526 nm. The FT-IR spectrum of the biosynthesized nano particles exhibited the features of the nitrile (-C≡N) functional group indicating that the -C≡N-bearing EO components are likely acting as reducing and stabilizing agents for the formation of EO-AuNPs. The plausible scheme of EO-AuNPsformation was proposed.The TEM analysis showed that the EO- AuNPs were almost spherical in shape with an average particle size of 12.7 nm. In addition, the antimicrobial activity was carried out by diffusion of agar wells method. The results proved that the EO-AuNPs displayed a potential antimicrobial against gram negative strains, with a maximum zone of inhibition of 16 mm for E. coli at a concentration of 100 µg / ml.

scholarly journals Synthesis and Characterization of Surfactant Capped Copper Nanoparticles Using Natural Vitamin

2020 ◽  
Vol 32 (9) ◽  
pp. 2130-2134
Author(s):  
B. VARUN KUMAR ◽  
Y. PARVEEN TAJ ◽  
K. HUSSAIN REDDY
Keyword(s):  
Vitamin C ◽  
Copper Nanoparticles ◽  
Average Particle Size ◽  
Inert Gas ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Gas Insulation ◽  
Triton X

Copper nanoparticles (CuNPs) have captivated amazing and renewable interest in recent years due to their fascinating features. In present investigation, CuNPs were produced by reducing copper sulphate with ascorbic acid (vitamin C) in aqueous medium without inert gas insulation at low temperature (80 ºC). In present synthetic procedure, a native vitamin C was applied as insulating agent to prevent oxidation of nascent CuNPs during the process and in storage. Triton X-100 was added that worked both as a size controller and as a capping agent. The CuNPs were characterized by UV-visible and FT-IR spectroscopies, powder X-ray diffraction (PXRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDX). Optical properties of Cu nanoparticles were explored using UV-vis spectroscopy. FT IR was employed to uncover the bonding between copper nanoparticles and Triton X-100. The CuNPs were discerned by PXRD and SEM-EDX Techniques. From the major diffraction peaks, the average particle size is determined using Debye-Scherer equation and it is found to be about 15 nm. It is hoped that the present results would pave a way for developing plans for the production of nascent CuNPs in the absence of inert gas insulation.

The Function Mechanism of Current Density on Antimony Nanopowder Prepared by Electrochemical Method

2011 ◽  
Vol 228-229 ◽  
pp. 639-644 ◽  
Author(s):  
Jian Lin Xu ◽  
Shu Hua Yang ◽  
Li Hui Zhang ◽  
Zhao Kang ◽  
Qiang Guo
Keyword(s):  
Current Density ◽  
Electrochemical Method ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Function Mechanism ◽  
Transmission Electron ◽  
Ft Ir ◽  
Current Densities ◽  
Shape And Size

The nano-antimony particles with different shape, size and stability are prepared by electrochemical method under the dilute hydrochloric acid electrolyte including the surface dispersant OP-10 and different current densities. The influences of current density on the shape and size of nanometer antimony particles prepared by electrochemical method are analyzed by using X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The results show that nano-antimony powder can be prepared by electrochemical method, and the antimony powder possesses the crystal structure with orthorhombic hexahedron. The current density has a significant impact on the agglomeration, shape and size of antimony powder. The size and shape of antimony powder are determined by the nucleation rate of nano-antimony and combination capacity of antimony ions and OP-10 surface dispersing agents affected by current density. When the current density is 25mA/cm2, the average particle size is 12nm or so, the shape is spherical, and the nano-antimony particles are well dispersed and no agglomeration.

Synthesis of Dispersed Y2O3 Nanopowder from Yttrium Stearate

2013 ◽  
Vol 544 ◽  
pp. 3-7 ◽  
Author(s):  
Jin Sheng Li ◽  
Xu Dong Sun ◽  
Shao Hong Liu ◽  
Di Huo ◽  
Xiao Dong Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Average Particle Size ◽  
Ceramic Materials ◽  
Average Particle ◽  
Water Medium ◽  
Nitrate Hexahydrate ◽  
Yttrium Nitrate ◽  
Ft Ir ◽  
Yttrium Nitrate Hexahydrate

Fine yttrium stearate powder was produced at a relatively low temperature using yttrium nitrate hexahydrate, ammonia and stearic acid as the raw materials. Dispersed Y2O3 nanopowder was synthesized by calcining the yttrium stearate. The formation mechanism of the precursor and the Y2O3 nanopowder was studied by means of XRD, TG-DTA, FT-IR, BET, FE-SEM and HR-TEM. Pure and dispersed Y2O3 nanopowder with an average particle size of 30 nm was produced by calcining the precursor at 600 °C. The particle size increases to about 60 nm with the increase of the calcination temperature to 1000 °C. In the preparation of Y2O3 from yttrium stearate, no water medium is involved, thus capillarity force and bridging of adjacent particles by hydrogen bonds can be avoided, resulting in good dispersion of the particles. The dispersed Y2O3 nanopowder prepared in this work has potential application in phosphors and transparent ceramic materials.

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