PREPARATION OF SOYPROTEIN BASED NANOPARTICLE

2016 ◽  
Vol 2 (1) ◽  
pp. 45-49
Author(s):  
A Malar Retna ◽  
A Sophia
Keyword(s):  
Graft Copolymer ◽  
Soy Protein ◽  
Room Temperature ◽  
Hydrolytic Stability ◽  
Glass Plate ◽  
Ethyl Methacrylate ◽  
Product Mixture ◽  
Emulsion Polymerisation ◽  
Xrd Studies ◽  
Chemical Resistivity

Soy protein based Nanoparticles were prepared via direct graft copolymerisation of soyprotein isolate (SPI)  with ethyl methacrylate at a temperature of 120◦c using benzoyl peroxide as a catalyst. The technique used here was emulsion polymerisation technique. The products obtained ie., the graft copolymer and the homopolymer Poly(ethyl methacrylate)(PEMA) were separated from the product mixture by dissolving the mixture using  chloroform in a separating funnel.The separated graft copolymer in the emulsion form was then spreaded over a glass plate to make a nano plastic sheet and the sheet was allowed to dry for 24 hrs at room temperature to remove chloroform from it. FTIR study confirmed the grafting of SPI and PEMA. XRD studies confirmed the presence of nanoparticles. TG-DTA, Hydrolytic stability, chemical resistivity and water absorption of the sample were studied. Grafting efficiency and grafting percentage of the sample were calculated.

Change of sign in the Casimir interaction of peptide films deposited on a dielectric substrate

2020 ◽  
Vol 35 (03) ◽  
pp. 2040020 ◽  
Author(s):  
E. N. Velichko ◽  
M. A. Baranov ◽  
V. M. Mostepanenko
Keyword(s):  
Free Energy ◽  
Film Thickness ◽  
Silica Glass ◽  
Room Temperature ◽  
Glass Plate ◽  
Pressure Change ◽  
Dielectric Substrate ◽  
Numerical Computations ◽  
Peptide Coatings

The Casimir free energy and pressure of thin peptide films deposited on a dielectric substrate are investigated in the region of parameters where they change their sign. Numerical computations are performed for a modelled peptide film on a silica glass plate. The Casimir free energy is computed at room temperature as a function of the film thickness and the fraction of water contained in the film. It is shown that the values of the Casimir pressure change from negative to positive when the film thickness decreases to below some value in the region from 115 to 133 nm depending on the fraction of water in the film. Possible applications of the obtained results to the problem of stability of peptide coatings are discussed.

scholarly journals An Efficient Synthesis and In vitro Cytostatic Activity of 5-Aminosulfonyl Uracil Derivatives

2019 ◽  
Vol 92 (2) ◽  
pp. 269-277
Author(s):  
Hamit Ismaili ◽  
Josipa Matić ◽  
Biserka Žinić ◽  
Ljubica Glavaš-Obrovac ◽  
Marijana Jukić ◽  
...  
Keyword(s):  
Antiproliferative Activity ◽  
Room Temperature ◽  
Efficient Synthesis ◽  
Aqueous Methanol ◽  
Uracil Derivatives ◽  
Product Mixture ◽  
Crude Product ◽  
I Cells ◽  
Mdck I

Efficient synthesis of 5-aminosulfonyl uracil derivatives 2-9 and results of their antiproliferative activity are provided. Sulfonylation of the amino group in 5-aminouracil 1 with selected arylsulfonyl chlorides occurs regioselectively when the reaction is carried out in pyridine at room temperature. Simple isolation of the products by recrystallization of the crude product mixture from aqueous methanol provides good to excellent yields. The prepared 5-aminosulfonyl uracil derivatives 2-9 were tested for the antiproliferative activity on a panel of seven tumor cell lines of different histological origin (HeLa, Caco-2, NCI-H358, Raji, HuT78, Jurkat, K562) and normal MDCK I cells. Derivatives 2-9 were found more efficient to lymphoma and leukemia cells compared to solid tumor and normal cells.

Structural Properties of PbS Nanoparticles Prepared by Photo Chemical Synthesis

2013 ◽  
Vol 678 ◽  
pp. 136-139
Author(s):  
S. Kanimozhi ◽  
Dhandapani Vishnushankar ◽  
V. Veeravazhuthi
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
Pbs Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Standard Values ◽  
Crystalline Nature ◽  
Xrd Studies

Lead sulfide (PbS) nanoparticles have been synthesized by photo chemical method and also in the dark ambient at room temperature. The pH of the solution is maintained by adding NaOH. The as-prepared PbS nanoparticles have been characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispersive Analysis of X-ray (EDAX) and Transmission Electron Microscopy (TEM). XRD studies reveal the crystalline nature of the particles. Grain size values are calculated using Scherrer’s formula and compared with the standard values. SEM picture shows a flower like structure in the sample synthesized at dark ambient, whereas the samples synthesized in light reveals the presence of varied nanostructures like nanorods, nanowires and nanoparticles. Size of the photo chemically synthesized PbS particles observed from TEM lies between 30nm to 60nm. From EDAX we conclude that the composition is nearly stoichiometric.

scholarly journals Biodegradable films made from raw and acetylated cassava starch

2004 ◽  
Vol 47 (3) ◽  
pp. 477-484 ◽  
Author(s):  
Fábio D. S. Larotonda ◽  
Kátia N. Matsui ◽  
Valdir Soldi ◽  
João B. Laurindo
Keyword(s):  
Mechanical Properties ◽  
Organic Solvents ◽  
Room Temperature ◽  
Glass Plate ◽  
Cassava Starch ◽  
Biodegradable Films ◽  
Starch Acetate ◽  
Starch Gelatinization ◽  
Two Alternatives

Studies were carried out to produce biodegradable films from cassava starch. Two alternatives were investigated. In the first, films were obtained by starch gelatinization followed by thermopressing and glycerol was used at different concentrations as a plasticizer. In the second, starch acetate films were obtained by solubilization of cassava starch acetate in organic solvents, followed by casting on a glass plate and drying at room temperature. The films obtained by gelatinization were transparent and resistant to traction. The starch acetate films were also transparent but breakable. The use of these starch acetate films in paper impregnation improved the mechanical properties of the paper.

Room-temperature, one-pot process for CO2 capture membranes based on PEMA-g-PPG graft copolymer

2017 ◽  
Vol 313 ◽  
pp. 1615-1622 ◽  
Author(s):  
Jung Pyo Jung ◽  
Cheol Hun Park ◽  
Jae Hun Lee ◽  
Youn-Sang Bae ◽  
Jong Hak Kim
Keyword(s):  
Graft Copolymer ◽  
Co2 Capture ◽  
Room Temperature ◽  
One Pot

scholarly journals Liquid-liquid phase separated microdomains of an amphiphilic graft copolymer in a surfactant-rich medium

2021 ◽  
Author(s):  
Xavier Castellvi Corrons ◽  
Jeremie Gummel ◽  
Johan Smets ◽  
Debora Berti
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Graft Copolymer ◽  
Room Temperature ◽  
Weight Ratio ◽  
Water Soluble ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Fluorescence Confocal Microscopy ◽  
Poly Ethylene

The liquid-liquid phase separation (LLPS) of amphiphilic thermoresponsive copolymers can lead to the formation of micron-sized domains, known as simple coacervates. Due to their potential to confine active principles, these copolymer-rich droplets have gained interest as encapsulating agents. Understanding and controlling the conditions inducing this LLPS is therefore essential for applicative purposes and requires thorough fundamental studies on self-coacervation. In this work, we investigate the LLPS of a comb-like graft copolymer (PEG-g-PVAc) consisting of a poly(ethylene glycol) backbone (6 kDa) with 2-3 grafted poly(vinyl acetate) chains, and a PEG/PVAc weight ratio of 40/60. Specifically, we report the effect of various water-soluble additives on its phase separation behavior. Kosmotropes and non-ionic surfactants were found to decrease the phase separation temperature of the copolymer, while chaotropes and, above all, ionic surfactants increased it. We then focus on the phase behavior of PEG-g-PVAc in the presence of sodium citrate and a C14-15 E7 non-ionic surfactant (N45-7), defining the compositional range for the generation of LLPS microdomains at room temperature and monitoring their formation with fluorescence confocal microscopy. Finally, we determine the composition of the microdomains through confocal Raman microscopy, demonstrating the presence of PEG-g-PVAc, N45-7, and water. These results expand our knowledge on polymeric self-coacervation, clarifying the optimal conditions and composition needed to obtain LLPS microdomains with encapsulation potential at room temperature in surfactant-rich formulations.

scholarly journals Comparison of Thermoresponsive Hydrogels Synthesized by Conventional Free Radical and RAFT Polymerization

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2697 ◽  
Author(s):  
Fanny Joubert ◽  
Peyton Cheong Phey Denn ◽  
Yujie Guo ◽  
George Pasparakis
Keyword(s):  
Free Radical ◽  
Room Temperature ◽  
Chain Transfer ◽  
Raft Polymerization ◽  
Hydrolytic Stability ◽  
Monomer Concentration ◽  
Crosslinking Density ◽  
Dye Release ◽  
Reversible Addition ◽  
Thermoresponsive Hydrogels

We compared the influence of the polymerization mechanism onto the physical characteristics of thermoresponsive hydrogels. The Poly(N-isopropylacrylamide) (PNIPAAm) hydrogels were successfully synthesized using reversible addition-fragmentation chain-transfer (RAFT) and free radical polymerization (FRP). The gels were prepared while using different crosslinker feed and monomer concentration. The swelling, dye release, and hydrolytic stability of the gels were investigated in water, or in representative komostrope and chaotrope salt solutions at room temperature and at 37 °C. It was found that the swelling ratio (SR) of the RAFT gels was significantly higher than that of the FRP gels; however, an increased crosslinking density resulted in a decrease of the SR of the RAFT gels as compared to the corresponding gels that are made by FRP, which indicates the limitation of the cross-linking efficiency that is attained in RAFT polymerization. Additionally, an increased monomer concentration decreased the SR of the RAFT gels, whereas a similar SR was observed for the FRP gels. However, the SR of both RAFT and FRP gels in NaSCN and Na2SO4 solutions were similar. Finally, the rate of dye release was significantly slower from the RAFT gels than the FRP gels and the hydrolytic stability of the RAFT gels was lower than that of FRP gels in water, but maintained similar stability in Na2SO4 and NaSCN solutions.

Emulsion Polymerisation of St/BuA Stabilised with a PEG-containing Graft Copolymer

2008 ◽  
Vol 16 (9) ◽  
pp. 635-639 ◽  
Author(s):  
Linlin Guo ◽  
Ge Gao ◽  
Xiaoli Liu ◽  
Fengqi Liu
Keyword(s):  
Ethylene Oxide ◽  
Graft Copolymer ◽  
Polystyrene Microspheres ◽  
Amphiphilic Graft Copolymer ◽  
In Situ Reaction ◽  
Emulsion Polymerisation ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

An amphiphilic graft copolymer comprising poly(ethylene oxide) (PEG) grafts was synthesised and characterised. It was used to stabilise the emulsion polymerisation of St or BuA. The effectiveness of this PEG-containing graft copolymer in stabilising St/BuA emulsion polymerisation was studied. Finally, stable dispersions of polystyrene microspheres were used as templates, and polystyrene microspheres were coated with Fe3O4 by in situ reaction of Fe3+ and Fe2+ in the presence of OH−. No additional treatments were needed in the process.

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