scholarly journals Linear Dextrin as Potential Insulin Delivery System: Effect of Degree of Polymerization on the Physicochemical Properties of Linear Dextrin–Insulin Inclusion Complexes

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4187
Author(s):  
Huifang Xie ◽  
Xin Ma ◽  
Wenbin Lin ◽  
Shiting Dong ◽  
Qiang Liu ◽  
...  
Keyword(s):  
Inclusion Complexes ◽  
Aqueous Ethanol ◽  
Potato Starch ◽  
Degree Of Polymerization ◽  
X Ray Diffraction ◽  
System Effect ◽  
X Ray ◽  
Ft Ir ◽  
Ir Analysis ◽  
Differential Solubility

In the current study, linear dextrin (LD) was prepared using waxy potato starch debranched with pullulanase, which has attracted immense interest in the food, pharmaceutical, and cosmetic industries as a versatile ingredient. Various LDs were separated on the basis of their differential solubility in aqueous/ethanol solutions of different volumetric ratios. Three LD products—LD Fabrications with 40% ethanol (F-40); LD Fabrications with 50% ethanol (F-50); and LD Fabrications with 60%, 70%, and 80% ethanol (F-M)—were obtained with an average degree of polymerization (DP) values of 31.44, 21.84, and 16.10, respectively. The results of Fourier transform infrared spectroscopy (FT-IR) analysis revealed that the reaction mainly involved hydrogen bonding and a hydrophobic interaction between LD and insulin in the process of inclusion complex formation. X-ray diffraction (XRD) results indicated that insulin was encapsulated in LD. The results of circular dichroism (CD) showed that the changes in the secondary structure of insulin were negligible during the release from the inclusion complexes. The order of encapsulation capacity is as follows: the complex composed of F-M and insulin (F-M-INS) > the complex composed of LD and insulin (LD-INS) > the complex composed of F-50 and insulin (F-50-INS) > and the complex composed of F-40 and insulin (F-40-INS). F-M-INS inclusion complexes showed a better effect on reducing the release of insulin in gastric juice and promoting the release of insulin in intestinal juice and blood plasma than LD-INS.

Synthesis of Ag decorated Zn-Co/TiO2 nanocomposites

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Katlakanti Mohan Reddy ◽  
Kajal Goswami
Keyword(s):  
Catalytic Properties ◽  
High Surface ◽  
High Surface Area ◽  
Nanocomposite Material ◽  
X Ray Diffraction ◽  
Crystalline Powder ◽  
X Ray ◽  
Ft Ir ◽  
Single Grain ◽  
Ir Analysis

AbstractNanocomposites plays a very significant role in the catalysis and photocatalysis. Our aim is to synthesize multiphase nanocomposite material with advanced catalytic properties that are useful in the energy and environmental applications. Nano silver (Ag0) decorated Zinc-Cobalt/Titania composite (Ag decorated Zn-Co/TiO2, AZCT) with nonporous in nature as well as single grain size of 10–15 nm with beautiful morphological in nature. The material has multiphase crystalline in nature predicted from the powdered X-ray diffraction studies (PXRD) and FT-IR analysis, which illustrate the multiphase crystalline powder with high surface area of nanoporous in nature. The synthesized nanocomposite material is labelled as AZCT.

Development of Biogenic Silver Nanoparticle Using Rosa Chinensis Flower Extract and Its Antibacterial Property

2016 ◽  
Vol 16 (4) ◽  
pp. 3969-3972 ◽  
Author(s):  
Yongde Meng ◽  
Yanjie Sun
Keyword(s):  
Silver Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rosa Chinensis ◽  
Flower Extract ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir Analysis ◽  
The Fourier Transform

In the present study, biosynthesis of silver nanoparticles was carried out using Rosa chinensis flower extract as reducing agent. The characterization of silver nanoparticles was done by UV-VIS spectrum. The morphology and size of silver nanoparticles were determined by transmission electron microscope (TEM) image. The crystallization of silver nanoparticles was confirmed by X-ray diffraction (XRD) measurements. The Fourier transform infrared (FT-IR) analysis was used to confirm the possible involvement in the formation and stabilization of synthesized silver nanoparticles by the extract of Rosa chinensis flower. Antibacterial activity of silver nanoparticles was studied against Gram positive Staphycoccus aureus and Gram negative Escherichia coli.

Synthesis, Different Characterizations and Pigment Application of Nanoceramic Zirconate Powder

2021 ◽  
Vol 21 (4) ◽  
pp. 2212-2220
Author(s):  
T. S. Gokul Raja ◽  
S. Balamurugan ◽  
A. Reshma
Keyword(s):  
Near Infrared ◽  
Pyrochlore Phase ◽  
Pyrochlore Structure ◽  
Nir Spectroscopy ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Ir Analysis ◽  
Highly Uniform

In this work, several attempts were made to prepare nanoceramic zirconate (Nd2Zr2O7) powder for pigment applications. The single pyrochlore phase, Nd2Zr2O7 was successfully synthesized with the aid of flux at relatively low temperature (1000 °C) upon milling the reaction mixture made from Nd2O3 and ZrO2 in a tungsten carbide vial. Several characterizations were done on the thermal analysis (TG/DTA), X-ray diffraction (XRD), High-resolution scanning electron microscope (HRSEM), energy dispersive X-ray (EDX) analysis, Fourier-transform infrared (FT-IR) analysis, and near-infrared (NIR spectroscopy). A single-phase nanocrystalline (˜28 nm) pyrochlore structure (Fd3m) was confirmed through XRD analysis. A highly uniform particle in the size of ˜110 nm was observed for the Nd2Zr2O7 phase in the microimages. The vibrational (FT-IR) peaks at 423 cm-1 and 510 cm-1 in FTIR spectroscopic study confirmed the formation of pyrochlore structure. Higher NIR reflectivity recorded for this material in the 750–2500 nm region shows its novel application in color cool pigments for energy-saving paints reminiscent of Bi2−xYxCe2O7, Bi2Ce2−xTbxO7, and Gd2Ti2O7.

scholarly journals Biosynthesis of 3D/2D Ceo2/Mos2 Nanocomposites with Enhanced Photocatalytic Activity to Degrade Organic Dye in Wastewater and Statistical Optimization of Reaction Parameters

2021 ◽  
Author(s):  
Yogesh Sharma ◽  
Mohammad Ahmed Khan ◽  
Thangapandi Chellapandi ◽  
Magdum Tejas Sukumar ◽  
Gunabalan Madhumitha ◽  
...  
Keyword(s):  
Methyl Violet ◽  
X Ray Diffraction ◽  
Molybdenum Disulphide ◽  
X Ray ◽  
Ft Ir ◽  
Particle Size And Morphology ◽  
Alternative Approaches ◽  
Ir Analysis ◽  
Process Factors ◽  
Size And Morphology

Abstract Nanocomposites synthesized by alternative approaches like biosynthetic methods are safer than those prepared by traditional chemical techniques. Further, this approach is both economically and environmentally feasible. In this study, we report an eco-friendly methodology for preparing cerium dioxide/molybdenum disulphide (CeO2/MoS2) nanocomposites. Moringa oleifera peel was used as the reducing/stabilizing agent for synthesizing CeO2 nanoparticles. The prepared nanocomposite were characterized using FT-IR analysis, SEM and EDAX analysis, TEM and SAED pattern analysis, X-Ray Diffraction Pattern, Zeta Potential, UV-Visible Diffuse Reflectance Spectra, X-Ray Photon Spectroscopy and Photoluminescence spectra. Particle size and morphology were characterized by TEM and SEM. The photocatalytic pursuit of CeO2/MoS2 was explored by the degradation of methyl violet (MV) under visible light irradiation. Our methodology proved to be 96.25% effective in the degradation of MV. Further, we used this Response Surface Methodology for enhancing the process factors like volume of photocatalyst, time for degradation and concentration of MV.

Growth and characterization of semi-organic nonlinear optical crystals of l-leucine hydrochlorobromide (LEHCBr)

2015 ◽  
Vol 93 (8) ◽  
pp. 836-840
Author(s):  
R. Omegala Priakumari ◽  
S. Grace Sahaya Sheba ◽  
M. Gunasekaran
Keyword(s):  
Single Crystal ◽  
Nonlinear Optical ◽  
Dielectric Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Ft Ir ◽  
Ir Analysis ◽  
Dta Curves

l-Leucine hydrochlorobromide (LEHCBr), a semi-organic nonlinear optical material, was synthesized and grown as single crystal by slow evaporation method at ambient temperature. The powder X-ray diffraction pattern of the grown LEHCBr crystal was indexed and compared with single crystal X-ray diffraction data. Functional groups present in the sample were identified by FT-IR analysis. The grown crystal shows a cut off wavelength of 247 nm from the recorded UV–vis–IR spectrum. The thermal stability and melting temperature of LEHCBr were determined from TGA/DTA curves. The Vickers hardness was evaluated to be 71.9 kg/mm2 using Vickers microhardness tester. The dielectric behavior of the crystal was studied at different temperatures. The positive photo conducting nature of the LEHCBr crystal was confirmed by photoconductivity study. The Kurtz–Perry powder study revealed the SHG efficiency of LEHCBr as 4.6 times higher than that of KDP.

Studies on the Preparation, Characterization and Solubility of -Cyclodextrin-Roxythromycin Inclusion Complexes

2009 ◽  
Vol 2 (2) ◽  
pp. 523-530
Author(s):  
D. Nagasamy Venkatesh ◽  
S. Karthick ◽  
M. Umesh ◽  
G. Vivek ◽  
R.M. Valliappan ◽  
...  
Keyword(s):  
Dissolution Rate ◽  
Inclusion Complexes ◽  
Phase Solubility ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Ir Studies ◽  
Poorly Soluble ◽  
Poorly Soluble Drug

Roxythromycin/ β-cyclodextrin (Roxy/ β-CD) dispersions were prepared with a view to study the influence of β-CD on the solubility and dissolution rate of this poorly soluble drug. Phase-solubility profile indicated that the solubility of roxythromycin was significantly increased in the presence of β-cyclodextrin and was classified as AL-type, indicating the 1:1 stoichiometric inclusion complexes. Physical characterization of the prepared systems was carried out by differential scanning calorimetry (DSC), X-ray diffraction studies (XRD) and IR studies. Solid state characterization of the drug β-CD binary system using XRD, FTIR and DSC revealed distinct loss of drug crystallinity in the formulation, ostensibly accounting for enhancement of dissolution rate.

Synthesis and Evaluation of Levulinic Ester as Biodiesel Additives

2020 ◽  
Vol 71 (8) ◽  
pp. 21-26
Author(s):  
Elena-Emilia Oprescu ◽  
Cristina-Emanuela Enascuta ◽  
Elena Radu ◽  
Vasile Lavric
Keyword(s):  
Maximum Yield ◽  
Strength Distribution ◽  
Point Of View ◽  
Reaction Parameters ◽  
X Ray ◽  
Ethyl Levulinate ◽  
Ft Ir ◽  
Ir Analysis ◽  
Biodiesel Blend ◽  
Acid Strength Distribution

In this study, the SO42-/TiO2-La2O3-Fe2O3 catalyst was prepared and tested in the conversion of fructose to ethyl levulinate . The catalyst was characterized from the point of view of the textural analysis, FT-IR analysis, acid strength distribution, X-ray powder diffraction and pyridine adsorption IR spectra. The influence of the reaction parameters on the ethyl levulinate yield was study. The maximum yield of 37.95% in levulinate esters was obtained at 180 �C, 2 g catalyst and 4 h reaction time. The effect of ethyl levulinate addition to diesel-biodiesel blend in different rates, i.e, 0.5, 1, 2.5, 5 (w.t %) on density, kinematic viscosity and flash point was evaluated and compared with the European specification.

scholarly journals Enhancement of Chloroprene/Natural/Butadiene Rubber Nanocomposite Properties Using Organoclays and Their Combination with Carbon Black as Fillers

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1085
Author(s):  
Patricia Castaño-Rivera ◽  
Isabel Calle-Holguín ◽  
Johanna Castaño ◽  
Gustavo Cabrera-Barjas ◽  
Karen Galvez-Garrido ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Black ◽  
High Performance ◽  
Rubber Matrix ◽  
Butadiene Rubber ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rubber Blends ◽  
Ft Ir ◽  
Chloroprene Rubber

Organoclay nanoparticles (Cloisite® C10A, Cloisite® C15) and their combination with carbon black (N330) were studied as fillers in chloroprene/natural/butadiene rubber blends to prepare nanocomposites. The effect of filler type and load on the physical mechanical properties of nanocomposites was determined and correlated with its structure, compatibility and cure properties using Fourier Transformed Infrared (FT-IR), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA) and rheometric analysis. Physical mechanical properties were improved by organoclays at 5–7 phr. Nanocomposites with organoclays exhibited a remarkable increase up to 46% in abrasion resistance. The improvement in properties was attributed to good organoclay dispersion in the rubber matrix and to the compatibility between them and the chloroprene rubber. Carbon black at a 40 phr load was not the optimal concentration to interact with organoclays. The present study confirmed that organoclays can be a reinforcing filler for high performance applications in rubber nanocomposites.

scholarly journals Electrospun Nanosystems Based on PHBV and ZnO for Ecological Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2123
Author(s):  
Maria Râpă ◽  
Maria Stefan ◽  
Paula Popa ◽  
Dana Toloman ◽  
Cristian Leostean ◽  
...  
Keyword(s):  
Food Packaging ◽  
Spin Trapping ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Hno3 Solution ◽  
X Ray ◽  
Trapping Method ◽  
Ft Ir ◽  
Doped Zno ◽  
Electron Paramagnetic

The electrospun nanosystems containing poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and 1 wt% Fe doped ZnO nanoparticles (NPs) (with the content of dopant in the range of 0–1 wt% Fe) deposited onto polylactic acid (PLA) film were prepared for food packaging application. They were investigated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), antimicrobial analysis, and X-ray photoelectron spectrometry (XPS) techniques. Migration studies conducted in acetic acid 3% (wt/wt) and ethanol 10% (v/v) food simulants as well as by the use of treated ashes with 3% HNO3 solution reveal that the migration of Zn and Fe falls into the specific limits imposed by the legislation in force. Results indicated that the PLA/PHBV/ZnO:Fex electrospun nanosystems exhibit excellent antibacterial activity against the Pseudomonas aeruginosa (ATCC-27853) due to the generation of a larger amount of perhydroxyl (˙OOH) radicals as assessed using electron paramagnetic resonance (EPR) spectroscopy coupled with a spin trapping method.

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