scholarly journals Incorporation of Tannic Acid in Food-Grade Guar Gum Fibrous Mats by Electrospinning Technique

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 141 ◽  
Author(s):  
Weiqiao Yang ◽  
Min Zhang ◽  
Xihong Li ◽  
Jianan Jiang ◽  
Ana Sousa ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Antioxidant Activity ◽  
Tannic Acid ◽  
Guar Gum ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Food Grade ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Incorporation Efficiency

The use of polysaccharides to produce functional micro- or nanoscale fibrous mats has attracted growing interest for their food-grade applications. In this study, the characterization and electro-spinnability of guar gum (GG) solutions loaded with tannic acid (TA) was demonstrated. Food-grade antioxidant materials were successfully produced by electrospinning while incorporating different loads of TA into GG fibers. Bead-free GG-TA fibers could be fabricated from GG solution (2 wt %) with 10 wt % TA. Increasing the amount of TA led to fibers with defects and larger diameter sizes. Fourier Transformed Infrared Spectroscopy and X-ray Diffraction of neat GG and TA loaded GG fibrous mats suggested that inclusion of TA interrupted the hydrogen bonding and that a higher density of the ordered junction zones formed with the increased TA. The high TA incorporation efficiency and retained antioxidant activity of the fibrous mats afford a potential application in active edible film or drug delivery system.

The Influence of Formula and Process on Physical Properties and the Release Profile of PVA/BSA Nanofibers Formed by Electrospinning Technique

2015 ◽  
Vol 31 ◽  
pp. 103-116 ◽  
Author(s):  
Chandra Risdian ◽  
Muhamad Nasir ◽  
Annisa Rahma ◽  
Heni Rachmawati
Keyword(s):  
Dip Coating ◽  
Differential Scanning Calorimetric ◽  
X Ray Diffraction ◽  
Successful Development ◽  
Electrospinning Technique ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Electrospinning Method ◽  
Coating Method ◽  
Dip Coating Method

Electrospinning is a simple versatile process to produce nanofibers. However, it requires careful approach to form appropriates fibers for different purposes. This report describes aspects influencing successful development of nanofiber containing BSA using electrospinning method. Optical and scanning electron microscopy, energy dispersive X-Ray and Fourier transformed infrared spectroscopy, differential scanning calorimetric, and X-Ray diffraction analysis of nanofiber were performed. Modification of PVA/BSA nanofiber with Eudragit L-100 was conducted by dip coating method. The presence of BSA increased the diameter of the fibers. Modification of PVA/BSA nanofiber with Eudragit L-100 delayed the release of BSA in acidic medium but promoting its release in intestinal mimicking medium.

scholarly journals A review of nanotechnology with an emphasis on Nanoplex

2015 ◽  
Vol 51 (2) ◽  
pp. 255-263
Author(s):  
Rupali Nanasaheb Kadam ◽  
Raosaheb Sopanrao Shendge ◽  
Vishal Vijay Pande
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Drug Loading ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Conventional Drug ◽  
Anionic Drugs ◽  
Oppositely Charged ◽  
The Brain

<p>The use of nanotechnology based on the development and fabrication of nanostructures is one approach that has been employed to overcome the challenges involved with conventional drug delivery systems. Formulating Nanoplex is the new trend in nanotechnology. A nanoplex is a complex formed by a drug nanoparticle with an oppositely charged polyelectrolyte. Both cationic and anionic drugs form complexes with oppositely charged polyelectrolytes. Compared with other nanostructures, the yield of Nanoplex is greater and the complexation efficiency is better. Nanoplex are also easier to prepare. Nanoplex formulation is characterized through the production yield, complexation efficiency, drug loading, particle size and zeta potential using scanning electron microscopy, differential scanning calorimetry, X-ray diffraction and dialysis studies. Nanoplex have wide-ranging applications in different fields such as cancer therapy, gene drug delivery, drug delivery to the brain and protein and peptide drug delivery.</p>

TiO2 nanofibers fabricated by electrospinning technique and degradation of MO dye under UV light

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Naveen Thakur ◽  
Nikesh Thakur ◽  
Viplove Bhullar ◽  
Saurabh Sharma ◽  
Aman Mahajan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Fiber Diameter ◽  
Uv Light ◽  
Rutile Phase ◽  
Powder Form ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Tio2 Nanofibers ◽  
X Ray ◽  
Uv Visible

Abstract Titanium dioxide (TiO2) nanofibers were synthesized by electrospinning to optimize the photocatalytic action efficiency. The synthesis of the fibers was carried out at four different wt% concentrations: 8, 9, 10 & 11% of polymer polyvinylpyrrolidone (PVP). The TiO2 fibers were further calcined at 700 °C to get powder form. The uncalcinated and calcined TiO2 nanofibers were characterized by using X-Ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM) and UV-Visible spectroscopy. Raman spectroscopy confirmed the rutile phase of the calcined TiO2nanofibers in powder form with a crystallite size of 34–38 nm. The surface morphology of the uncalcinated and calcined TiO2 nanofibers was examined by SEM and the fiber diameter found to be 360–540 nm. The optical bandgap of the calcined TiO2 nanofibers was found in the range of 3.29–3.24 eV. The photocatalytic activity of the TiO2 nanofibers as examined for uncalcinated and calcined nanofibers, methyl orange (MO) dye degraded up to 98 and 78%, respectively in 180 min under the exposure of UV light. Uncalcinated TiO2 nanofibers were found more suitable for degradation of MO dye as compared to calcined nanofibers.

scholarly journals Effect of Film Formation Method and Annealing on Crystallinity of Poly(L-Lactic Acid) Films

2011 ◽  
Author(s):  
Shan-Ting Hsu ◽  
Y. Lawrence Yao
Keyword(s):  
Drug Delivery ◽  
Lactic Acid ◽  
Film Formation ◽  
Solvent Casting ◽  
Crystalline Morphology ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lamellar Structures ◽  
Coating Methods ◽  
Formation Method

Poly(L-lactic acid) (PLLA) has been shown to have potential medical usage such as in drug delivery because it can degrade into bioabsorbable products in physiological environments, and its degradation is affected by crystallinity. In this paper, the effect of film formation method and annealing on the crystallinity of PLLA are investigated. The films are made through solvent casting and spin coating methods, and subsequent annealing is conducted. The resulting crystalline morphology, structure, conformation, and intermolecular interaction are examined using optical microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. It is observed that solvent casting produces category 1 spherulites while annealed spin coated films leads to spherulites of category 2. Distinct lamellar structures and intermolecular interactions in the two kinds of films have been shown. The results enable better understanding of the crystallinity in PLLA, which is essential for its drug delivery application.

scholarly journals Study on the Catalytic Effect of Nitric Acid Activated Myanmar Natural Clay for the Degradation of Plastic Wastes

2018 ◽  
Vol 3 (8) ◽  
pp. 56
Author(s):  
Amie Thant ◽  
Chaw Su Su Hmwe
Keyword(s):  
Nitric Acid ◽  
Catalyst Support ◽  
Natural Clay ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Physico Chemical ◽  
Plastic Wastes ◽  
Pyrolytic Oil ◽  
Liquid Yield

In this study, the performance of different acid treated Myanmar Natural Clay (Mabisian) was conducted the pyrolysis of mixed plastic wastes, 40% high density polyethylene, 30% polypropylene, 25% low density polyethylene and 5% polystyrene. Mabisian clay was refluxed with different concentration of nitric acid (2M, 4M, 6M, 8M, 10M, 12M and 14M)  at 100ºC for 3hrs followed by calcination at 500ºC for 1hr. The physico-chemical characteristics of resulted leached clay were studied by X-Ray Fluoresence spectroscopy (XRF), X-Ray Diffraction (XRD) and Fourier Transformed Infrared Spectroscopy (FTIR). The pyrolytic oil was characterized by Gas Chromatography – mass spectopy (GC-MS). XRF and FTIR studies indicated that acid treatment under reflux condition lead to the removal of octahedral Al3+ cations along with other impurities.  The chemical treatment increased the Si/Al ratio.  The maximum liquid yield (75%) was obtained at 12 M nitric acid, 3hr reaction time and 100 º C reaction temperatures. In addition, the percent peak area of gasoline range hydrocarbon was obtained 55.6% at optimum condition. Thus, the treated clay can be used as promising as catalyst support.

scholarly journals Synthesis of calcium-phosphate and chitosan bioceramics for bone regeneration

2001 ◽  
Vol 73 (4) ◽  
pp. 525-532 ◽  
Author(s):  
MELLATIE R. FINISIE ◽  
ATCHE JOSUÉ ◽  
VALFREDO T. FÁVERE ◽  
MAURO C. M. LARANJEIRA
Keyword(s):  
Bone Regeneration ◽  
Solid Phase ◽  
Thermo Gravimetric Analysis ◽  
Analytical Techniques ◽  
Bone Substitutes ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Beneficial Effects ◽  
Fourier Transformed Infrared Spectroscopy

Bioceramic composites were obtained from chitosan and hydroxyapatite pastes synthesized at physiological temperature according to two different syntheses approaches. Usual analytical techniques (X-ray diffraction analysis, Fourier transformed infrared spectroscopy, Thermo gravimetric analysis, Scanning electron microscopy, X-ray dispersive energy analysis and Porosimetry) were employed to characterize the resulting material. The aim of this investigation was to study the bioceramic properties of the pastes with non-decaying behavior from chitosan-hydroxyapatite composites. Chitosan, which also forms a water-insoluble gel in the presence of calcium ions, and has been reported to have pharmacologically beneficial effects on osteoconductivity, was added to the solid phase of the hydroxyapatite powder. The properties exhibited by the chitosan-hydroxyapatite composites were characteristic of bioceramics applied as bone substitutes. Hydroxyapatite contents ranging from 85 to 98% (w/w) resulted in suitable bioceramic composites for bone regeneration, since they showed a non-decaying behavior, good mechanical properties and suitable pore sizes.

scholarly journals Borax-Cross-Linked Guar Gum-Manganese Dioxide Composites for Oxidative Decolorization of Methylene Blue

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rohan S. Dassanayake ◽  
Erandathi Rajakaruna ◽  
Noureddine Abidi
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Manganese Dioxide ◽  
Guar Gum ◽  
Spectrophotometric Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Decolorization Efficiency ◽  
Desorption Mechanism ◽  
Scanning Electron

Borax-cross-linked guar gum-manganese dioxide (GGB-MnO2) composite was synthesized using an environmentally friendly synthesis route and investigated for its efficiency of decolorizing methylene blue (MB) dye solution by an ultraviolet-visible (UV-Vis) spectrophotometric study. The GGB-MnO2 composite was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The composite (1.2 g/L) exhibited excellent oxidative decolorization of MB (30 mg/L, 50 mL) solution to over 99% in 6, 13, and 40 min at pH 4, 7, and 10, respectively. The complete decolorization of MB occurred via a catalytic adsorption-oxidation-desorption mechanism. The GGB-MnO2 composite showed very good reusability and was stable after ten successive cycles with negligible losses of the decolorization efficiency.

Platinum(II) complex with 4-nitro-N-(pyridin-2-ylmethylidene)aniline: synthesis, characterization, crystal structure and antioxidant activity

2020 ◽  
Vol 76 (11) ◽  
pp. 1005-1009
Author(s):  
Mehdi Khalaj ◽  
Abolfazl Olyaei ◽  
Mahdieh Sadeghpour ◽  
Arash Lalegani ◽  
Janusz Lipkowski ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Antioxidant Activity ◽  
Schiff Base ◽  
Schiff Base Ligand ◽  
Chain Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Square Planar ◽  
Dpph Method ◽  
Bidentate Schiff Base Ligand

A novel complex has been prepared using the (E)-4-nitro-N-(pyridin-2-ylmethylidene)aniline bidentate Schiff base ligand and PtCl2, namely, dichlorido[(E)-4-nitro-N-(pyridin-2-ylmethylidene)aniline-κ2 N,N′]platinum(II) acetonitrile hemisolvate, [PtCl2(C12H9N3O2)]·0.5CH3CN, 1. According to the X-ray measurements of the crystal structure, the PtII ion adopts a PtCl2N2 square-planar coordination. The coordination of the Schiff base ligand to the PtII ion occurs in a cyclic bidentate fashion, as a result of which a five-membered metallacycle is formed. Furthermore, in the structure of 1, the neutral molecules form a one-dimensional chain structure through C—H...Cl and C—H...O hydrogen bonds. The characterization of the complex was performed via single-crystal X-ray diffraction, IR spectroscopy and elemental analysis, and the antioxidant activity of the complex was evaluated using spectrophotometry by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method.

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