scholarly journals Preparation and Assessment of Some Characteristics of Nanoparticles Based on Sodium Alginate, Chitosan, and Camellia chrysantha Polyphenols

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Phu Hoang Luong ◽  
Thuy Chinh Nguyen ◽  
The Dan Pham ◽  
Do Mai Trang Tran ◽  
Thi Ngoc Lien Ly ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Release Kinetics ◽  
Release Kinetic ◽  
Ionic Gelation ◽  
Visible Spectroscopy ◽  
Polyphenol Content ◽  
Release Process ◽  
Kinetics Of ◽  
Scanning Electron

This paper presents the characteristics, morphology, and properties of alginate/chitosan/polyphenol nanoparticles, in which polyphenols were extracted from Camellia chrysantha leaves collected in Tam Dao district, Vinh Phuc province (Vietnam). The alginate/chitosan/polyphenol nanoparticles were prepared by ionic gelation method at different polyphenol content. The characteristics and morphology of these nanoparticles were investigated using infrared spectroscopy (IR), ultraviolet-visible spectroscopy (UV-Vis), and scanning electron microscopy (SEM). Release kinetic of polyphenols from the alginate/chitosan/polyphenol nanoparticles was conducted in simulated human body fluids. The release kinetics of polyphenols from the above nanoparticles were also evaluated and discussed. The experimental results showed that the release process of polyphenols from the nanoparticles was dependent on three factors: time, pH of solution, and amount of polyphenols.

scholarly journals Synthesis and Evaluation of AlgNa-g-poly(QCL-co-HEMA) Hydrogels as Platform for Chondrocyte Proliferation and Controlled Release of Betamethasone

2021 ◽  
Vol 22 (11) ◽  
pp. 5730
Author(s):  
Jomarien García-Couce ◽  
Marioly Vernhes ◽  
Nancy Bada ◽  
Lissette Agüero ◽  
Oscar Valdés ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Controlled Release ◽  
Biomedical Applications ◽  
Release Kinetics ◽  
Cell Types ◽  
Tissue Engineering Scaffolds ◽  
Almost All ◽  
Scanning Electron

Hydrogels obtained from combining different polymers are an interesting strategy for developing controlled release system platforms and tissue engineering scaffolds. In this study, the applicability of sodium alginate-g-(QCL-co-HEMA) hydrogels for these biomedical applications was evaluated. Hydrogels were synthesized by free-radical polymerization using a different concentration of the components. The hydrogels were characterized by Fourier transform-infrared spectroscopy, scanning electron microscopy, and a swelling degree. Betamethasone release as well as the in vitro cytocompatibility with chondrocytes and fibroblast cells were also evaluated. Scanning electron microscopy confirmed the porous surface morphology of the hydrogels in all cases. The swelling percent was determined at a different pH and was observed to be pH-sensitive. The controlled release behavior of betamethasone from the matrices was investigated in PBS media (pH = 7.4) and the drug was released in a controlled manner for up to 8 h. Human chondrocytes and fibroblasts were cultured on the hydrogels. The MTS assay showed that almost all hydrogels are cytocompatibles and an increase of proliferation in both cell types after one week of incubation was observed by the Live/Dead® assay. These results demonstrate that these hydrogels are attractive materials for pharmaceutical and biomedical applications due to their characteristics, their release kinetics, and biocompatibility.

Synthesis and Characterization of Gold Nanoparticles Synthesized in Gel and Paper by Electrolysis

2019 ◽  
Vol 824 ◽  
pp. 163-167
Author(s):  
Pema Dechen ◽  
Ekasith Somsook
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Gold Leaf ◽  
Uv Visible ◽  
Scanning Electron

In this report, synthesis and characterization of gold nanoparticles (AuNPs) from gold leaf by electrolysis in two different media (gel and paper) in presence of sodium chloride (NaCl), glucose (C6H12O6) and polyvinyl pyrrolidone (PVP) at room temperature were investigated. Graphite was used as two electrodes, NaCl was used as an electrolyte, C6H12O6 was used as reducing agent and PVP was used as stabilizer to control the aggregation of the nanoparticles. UV-Visible spectroscopy (UV-Vis) and scanning electron microscopy (SEM) were used to confirm the characteristics and morphologies of the synthesized AuNPs.

scholarly journals SODIUM ALGINATE/GELATIN MICROBEADS-INTERCALATED WITH KAOLIN NANOCLAY FOR EMERGING DRUG DELIVERY IN WILSON’S DISEASE

2019 ◽  
pp. 71-80 ◽  
Author(s):  
O. SREEKANTH REDDY ◽  
M. C. S. SUBHA ◽  
T. JITHENDRA ◽  
C. MADHAVI ◽  
K. CHOWDOJI RAO ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Drug Release ◽  
Ftir Spectroscopy ◽  
Sodium Alginate ◽  
Release Kinetics ◽  
In Vitro Release ◽  
Vitro Release ◽  
Scanning Electron

Objective: The aim of the present study was to fabricate and evaluate the drug release studies using Sodium Alginate (SA) and Gelatin (GE) microbeads intercalated with Kaolin (KA) nanoclay for sustained release of D-Penicillamine (D-PA). Methods: Sodium alginate/gelatin/Kaolin blend microbeads were prepared by an extrusion method by using glutaraldehyde (GA) as a crosslinker. The obtained microbeads were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and X–ray diffraction (XRD). Drug release kinetics of the microbeads was investigated in simulated intestinal fluid (pH 7.4) at 37 °C. Results: Microbeads formation was confirmed by FTIR spectroscopy. X-RD reveals that the KA should be intercalated with the drug and also it confirms the molecular level dispersion of D-Penicillamine into microbeads. Scanning Electron Microscopy (SEM) studies reveal that the beads were in spherical shape with some wrinkled depressions on the surface. The in vitro release study indicates the D-Penicillamine released in a controlled manner. The in vitro release kinetics was assessed by Korsmeyer-Peppas equation and the ‘n’ value lies in between 0.557-0.693 indicates Non-Fickian diffusion process. Conclusion: The results suggest that the developed KA intercalated microbeads are good potential drug carrier for the controlled release of D-PA.

scholarly journals DESIGN AND DEVELOPMENT OF RILPIVIRINE NANOPARTICLE CONTAINING CHITOSAN USING IONIC GELATION METHOD FOR HIV INFECTIONS

2020 ◽  
pp. 113-118
Author(s):  
MONTUKUMAR PATEL ◽  
NIRAV V. PATEL ◽  
TEJAS B. PATEL
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
In Vitro Release ◽  
Amorphous State ◽  
Hiv Infections ◽  
Spherical Particles ◽  
Ionic Gelation ◽  
Scanning Calorimetry ◽  
Scanning Electron

Objective: The primary objective of the current research was to prepare rilpivirine loaded Nanoparticles containing Chitosan using the ionic gelation method for HIV infections. Methods: The nanoparticles of rilpivirine were prepared using the ionic gelation technique. Further, nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and in vitro drug release. Results: The optimized nanoparticles were found with a particle size of 130.30±5.29 nm (mean±SD) and entrapment efficiency (% EE) of 77.10±0.50%. Scanning electron microscopy technique exposed spherical particles with uniform size. It was observed that the nanoparticles created showed the absence of the crystalline nature of the drug and its switch to the amorphous state. Results showed that more than 45% of the pure drug is released in 50 min and after 90 min almost about 95% of the drug is released. Conclusion: The research study concluded that the in vitro release profile of nanoparticles was found to be sustained up to 24 hr. Sustained release of the rilpivirine could improve patient obedience to drug regimens, growing action effectiveness. 

scholarly journals Curing kinetics of phenolphthalein based polyphosphazene towards thermal stability and flame retardancy of polybenzoxazine

RSC Advances ◽  
2019 ◽  
Vol 9 (54) ◽  
pp. 31583-31593 ◽  
Author(s):  
Ling Zhao ◽  
Chunxia Zhao ◽  
Min Wu ◽  
Yuntao Li ◽  
Hui Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Flame Retardancy ◽  
Curing Kinetics ◽  
Ultrasound Assisted ◽  
Kinetics Of ◽  
Polymerization Method ◽  
Scanning Electron

Phenolphthalein type polyphosphazene (PZPT) microspheres were synthesized by an ultrasound assisted precipitation polymerization method, and their structures were confirmed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy.

Preparation of Thermoresponsive Chitosan Polymers and Its Application Controlling Release of Antifouling Agent

2013 ◽  
Vol 562-565 ◽  
pp. 664-667 ◽  
Author(s):  
Feng Ling Xu ◽  
Cun Guo Lin ◽  
Ji Yong Zheng ◽  
Jin Wei Zhang ◽  
Li Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Encapsulation Efficiency ◽  
Sodium Tripolyphosphate ◽  
Ionic Gelation ◽  
Gelation Process ◽  
Chitosan Microparticles ◽  
Antifouling Agent ◽  
Physicochemical Structure ◽  
Scanning Electron

Thermoresponsive chitosan copolymers embed with antifouling agent paeonol in chitosan(CS) microparticles were prepared and the release dynamics was studied at different temperature. Chitosan microparticles have been formed based on ionic gelation process of CS and sodium tripolyphosphate (TPP). Paeonol was incorporated into the CS microparticles with the size about 0.1 μm. The physicochemical structure of samples was analyzed by FTIR and scanning electron microscopy (SEM). We investigated the influence of sodium tripolyphosphate (TPP) and paeonol on Encapsulation efficiency. Increasing TPP concentration from 1 to 3 mg/ml increased encapsulation efficiency of paeonol from 63% to 92%. Increasing peaonol concentration from 1.0 to 3.0 mg/ml increased peaonol encapsulation efficiency from 72% to 85%.

scholarly journals Green Synthesis, Characterization, and Evaluation of the Antimicrobial Activity of Camellia sinensis Silver Nanoparticles

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Toga Khalid Mohamed ◽  
Marivt Osman Widdatallah ◽  
Maida Musa Ali ◽  
Afraa Mubarak Alhaj ◽  
DhiaEldin AbdElmagied Elhag
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Camellia Sinensis ◽  
Multiple Drug Resistance ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Scanning Electron

An extremely worrying and alarming increase in the level of multiple drug resistance is reported in Sudan, in which bacterial strains are becoming resistant to many commonly available antibiotics. Eventually, it is becoming extremely difficult to treat debilitating infections. In search of promising solutions to this arising crisis, Camellia sinensis silver nanoparticles were synthesized using the green synthesis method. The synthesis of the Camellia sinensis silver nanoparticles is confirmed using analytical methods as ultraviolet-visible spectroscopy, X-ray diffractometer, and scanning electron microscopy. Using the ultraviolet-visible spectroscopy, an absorption band of 412 nm was observed. Furthermore, scanning electron microscopy revealed the presence of silver nanoparticles which fell within the range of 1–100 nm, and X-ray diffractometer analysis showed three intense peaks with a maximum intense peak at 24.3 theta. Nanoparticles distribution between 12 nm and 64 nm was observed with an average diameter of 18.115 nm. It also revealed orthorhombic-shaped nanoparticles. The synthesized nanoparticles showed antimicrobial activity against Staphylococcus aureus with a zone of inhibition of 7 mm, but none was detected against Escherichia coli. The obtained physicochemical properties were correlated with the antibacterial activity of the silver nanoparticles.

scholarly journals Wettability of Copper Coated Carbon Fibers

1994 ◽  
Vol 3 (4) ◽  
pp. 096369359400300
Author(s):  
G. Carotenuto ◽  
A. Gallo ◽  
L. Nicolais
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Solid Surface ◽  
Fiber Surface ◽  
Wetting Kinetics ◽  
Coated Carbon ◽  
Kinetics Of ◽  
Scanning Electron

The wetting kinetics of a solid surface by a molten metal decrease with increase of its roughness. The topography of the growing copper coating, produced on carbon fiber surface by electroplating from a sulphat bath, has been studied by scanning electron microscopy. The smoothes surface is produced after 200÷300 milliampere-hour of plating.

Characterization of Synthesized SnO2 Nanoparticles and its Application for the Photo Catalytic Degradation of Eosin Y in Aqueous Solution

2021 ◽  
Vol 43 (1) ◽  
pp. 14-14
Author(s):  
Fazal Akbar Jan Fazal Akbar Jan ◽  
Muhammad Aamir Muhammad Aamir ◽  
Naimat Ullah and Husaain Gulab Naimat Ullah and Husaain Gulab
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Sno2 Nanoparticles ◽  
Catalytic Degradation ◽  
Eosin Y ◽  
X Rays ◽  
Visible Spectroscopy ◽  
Uv Visible ◽  
Scanning Electron

The synthesized oxide (SnO2) nanoparticles by sol-gel method were characterized using UV-Visible spectroscopy (UV-Vis), Fourier Transform Infrared spectroscopy (FTIR), X-rays diffraction(XRD) and Scanning electron microscopy(SEM). Using X-rays diffraction analysis different parameter were calculated such as crystallite size, d-spacing, dislocation density, number of unit cell, cell volume, morphological index, micro strain and instrumental broadening. The average particle size was 28.396 nm. Scanning electron microscopy revealed that SnO2 nanopartcles are uniformly distributed. Optical properties such as band gap (energy gap = 3.6 eV) was calculated from UV-Visible spectroscopy. The characterized particles were used as photocatalyst for the degradation of Eosin dye in aqueous solution under UV light. The effect of different parameters i.e irradiation time, initial dye concentration, pH of the medium and catalyst weight on percent degradation was also studied. Mmaximum dye degradation was found at 220 minutes time interval that was 92 % using 10 ppm solution. At pH 5 the degradation of dye was found to be 94%. The catalyst dose of 0.06 g was found to be the optimum weight for the best photo catalytic degradation of Eosin Y.

scholarly journals Preparation of a Novel Nanocomposite of Polyaniline Core Decorated with Anatase-TiO2Nanoparticles in Ionic Liquid/Water Microemulsion

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Yanni Guo ◽  
Deliang He ◽  
Sanbao Xia ◽  
Xin Xie ◽  
Xiang Gao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ionic Liquid ◽  
Fourier Transform ◽  
Liquid Water ◽  
Particle Sizes ◽  
Visible Spectroscopy ◽  
Novel Structure ◽  
Transmission Electron ◽  
Scanning Electron

Polyaniline core decorated with TiO2(PANI-TiO2) nanocomposite particles was successfully synthesized in ionic liquid/water (IL/water) microemulsion in the presence of anatase TiO2nanoparticles. The TiO2nanoparticles had been dispersed beforehand in OP-10 andn-butanol to weaken the strong particles agglomeration of TiO2. The PANI-TiO2nanocomposites were characterized by fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-Vis), scanning electron microscopy (SEM), and transmission electron microscope (TEM), and their electrochemical behavior was estimated by the electrochemical workstation. SEM micrographs showed that the nanocomposites exhibited spherical morphology with particle sizes about 70 nm. The TEM result showed that the PANI-TiO2nanocomposites had a novel structure and that nanocrystalline TiO2deposited onto the surface of PANI, which was different from the reported structure of TiO2-PANI nanocomposites. Both FTIR and UV-Vis spectra indicate that polyaniline and nano-TiO2particles are not simply blended or mixed up. A possible reaction mechanism for this nanocomposite preparation is suggested and analyzed.

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