Chitosan-Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One-Step

Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 50°C in a one-step method comprising coprecipitation in the presence of low chitosan content. CMNP showed high magnetization and superparamagnetism. They were composed of a core of 9.5 nm in average diameter and a very thin chitosan layer in accordance with electron microscopy measurements. The results from Fourier transform infrared spectrometry demonstrated that CMNP were obtained and those from thermogravimetric analysis allowed to determine that they were composed of 95 wt% of magnetic nanoparticles and 5 wt% of chitosan. 67% efficacy in the Pb+2removal test indicated that only 60% of amino groups on CMNP surface bound to Pb, probably due to some degree of nanoparticle flocculation during the redispersion. The very low weight ratio chitosan to magnetic nanoparticles obtained in this study, 0.053, and the high yield of the precipitation reactions (≈97%) are noticeable.

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One-Step Method for Preparation of Magnetic Nanoparticles Coated with Chitosan

Journal of Nanomaterials ◽

10.1155/2012/813958 ◽

2012 ◽

Vol 2012 ◽

pp. 1-8 ◽

Cited By ~ 91

Author(s):

Karla M. Gregorio-Jauregui ◽

Ma. Guadalupe Pineda ◽

Jorge E. Rivera-Salinas ◽

Gil Hurtado ◽

Hened Saade ◽

...

Keyword(s):

Magnetic Nanoparticles ◽

Magnetic Measurements ◽

Average Diameter ◽

Superparamagnetic Nanoparticles ◽

Step Method ◽

Simple Method ◽

Transmission Electron ◽

Scanning Transmission ◽

One Step ◽

Heavy Metal Ions Removal

Preparation of magnetic nanoparticles coated with chitosan in one step by the coprecipitation method in the presence of different chitosan concentrations is reported here. Obtaining of magnetic superparamagnetic nanoparticles was confirmed by X-ray diffraction and magnetic measurements. Scanning transmission electron microscopy allowed to identify spheroidal nanoparticles with around 10-11 nm in average diameter. Characterization of the products by Fourier transform infrared spectroscopy demonstrated that composite chitosan-magnetic nanoparticles were obtained. Chitosan content in obtained nanocomposites was estimated by thermogravimetric analysis. The nanocomposites were tested in Pb2+removal from a PbCl2aqueous solution, showing a removal efficacy up to 53.6%. This work provides a simple method for chitosan-coated nanoparticles obtaining, which could be useful for heavy metal ions removal from water.

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The Role of MgCl2 in Preparation of SnO2, MgSnO3 and Mg2SnO4 Nanopowders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.640 ◽

2011 ◽

Vol 403-408 ◽

pp. 640-645

Author(s):

Ali Taherkhani ◽

A.Taheri Asghari

Keyword(s):

Annealing Temperature ◽

Weight Ratio ◽

Growth Inhibitor ◽

Solid State Reactions ◽

High Yield ◽

Grain Sizes ◽

Air Atmosphere ◽

One Step ◽

Xrd Patterns

Tin oxide (SnO2) ,MgSnO3and Mg2SnO4nanocrystals have been synthesized by one-step solid-state reactions. in the first step, The powder of SnCl4.5H2O was mixed with MgCl2and Mg(OH)2with weight ratio of Sn to Mg (1:1), (2:1) And (1:2) in an air atmosphere at room, and annealing temperature in this work were 200°C, 400°C ,600°C , 800°C and 1000°C . XRD patterns show the SnO2, MgSnO3and Mg2SnO4particle size of synthesized powders by MgCl2were 3 nm, 4nm and 27 nm respectively. In fact the excess amount of Mg role of crystallite growth inhibitor in SnO2. this method is a simple ,inexpensive ,efficient and economic preparation for SnO2, MgSnO3and Mg2SnO4nanoparticles with adjustable grain sizes in the range of 3-44nm in high yield. This article shows the role of mass MgCl2in producing of SnO2nanoparticles.

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A one step method for isolation of genomic DNA using multi-amino modified magnetic nanoparticles

RSC Advances ◽

10.1039/d0ra09409a ◽

2021 ◽

Vol 11 (6) ◽

pp. 3324-3332

Author(s):

Jia Xu ◽

Dan Chen ◽

Yuan Yang ◽

Hongjian Gong ◽

Wenqi Gao ◽

...

Keyword(s):

Magnetic Nanoparticles ◽

Genomic Dna ◽

Dna Isolation ◽

Step Method ◽

One Step ◽

Modified Magnetic Nanoparticles

Schematic procedure of DNA isolation using mAMNPs.

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A facile, one-step method for the determination of accessible surface primary amino groups on solid carriers

Surface and Interface Analysis ◽

10.1002/sia.4912 ◽

2012 ◽

Vol 44 (10) ◽

pp. 1309-1313 ◽

Cited By ~ 4

Author(s):

Zhenyuan Qu ◽

Hong Xu ◽

Puwen Ning ◽

Hongchen Gu

Keyword(s):

Amino Groups ◽

Step Method ◽

One Step ◽

Primary Amino ◽

Accessible Surface

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One-step hydrothermal synthesis of carbonated hydroxyapatite porous microspheres with a large and uniform size regulated by l-glutamic acid

CrystEngComm ◽

10.1039/c6ce00902f ◽

2016 ◽

Vol 18 (31) ◽

pp. 5876-5884 ◽

Cited By ~ 15

Author(s):

Mei-li Qi ◽

Jia Qi ◽

Gui-yong Xiao ◽

Kai-yuan Zhang ◽

Chen-yu Lu ◽

...

Keyword(s):

Hydrothermal Synthesis ◽

Glutamic Acid ◽

Average Diameter ◽

Step Method ◽

Uniform Size ◽

Porous Hydroxyapatite ◽

Carbonated Hydroxyapatite ◽

Porous Microspheres ◽

One Step ◽

Interconnected Pores

Carbonated porous hydroxyapatite microspheres with an average diameter of about 64 μm and interconnected pores were hydrothermally synthesized by a one-step method.

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Synthesis and characterization of thiourea

Polish Journal of Chemical Technology ◽

10.2478/pjct-2019-0027 ◽

2019 ◽

Vol 21 (3) ◽

pp. 35-39

Author(s):

Chuanbo Dai ◽

Hongyu Zhang ◽

Ruiduan Li ◽

Haifeng Zou

Keyword(s):

Reaction Time ◽

Reaction Temperature ◽

Raw Materials ◽

High Yield ◽

Mass Ratio ◽

X Ray Diffraction ◽

Step Method ◽

Lawesson’S Reagent ◽

One Step ◽

Lawesson's Reagent

Abstract Herein, a simple and effective method for the preparation of thiourea using a nucleophilic substitution reaction is reported. Urea and Lawesson’s reagent were used as the raw materials to prepare thiourea via a one-step method involving the sulfuration reaction, and the reaction mechanism was analyzed. The effect of the reaction time, reaction temperature, and mass ratio of the raw materials on the yield of thiourea were investigated.The most beneficial conditions used for the reaction were determined to be: Reaction time = 3.5 h, reaction temperature = 75°C, and mass ratio of urea to Lawesson’s reagent = 2:1. Under these optimal conditions, the average yield of thiourea over five replicate experiments was 62.37%. Characterization using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and thermogravimetric analysis (TGA) showed that the as-synthesized substance was thiourea. Our synthetic method has the advantages of high yield, mild reaction conditions and simplicity.

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Purification of Urokinase from Complex Mixtures Using Immobilized Monoclonal Antibody Against Urokinase Light Chain

Thrombosis and Haemostasis ◽

10.1055/s-0038-1657308 ◽

1983 ◽

Vol 49 (01) ◽

pp. 024-027 ◽

Cited By ~ 20

Author(s):

David Vetterlein ◽

Gary J Calton

Keyword(s):

Monoclonal Antibody ◽

Light Chain ◽

Culture Media ◽

Biological Fluids ◽

Single Step ◽

High Yield ◽

Step Method ◽

Commercial Preparation ◽

E Coli ◽

Tissue Culture Media

SummaryThe preparation of a monoclonal antibody (MAB) against high molecular weight (HMW) urokinase light chain (20,000 Mr) is described. This MAB was immobilized and the resulting immunosorbent was used to isolate urokinase starting with an impure commercial preparation, fresh urine, spent tissue culture media, or E. coli broth without preliminary dialysis or concentration steps. Monospecific antibodies appear to provide a rapid single step method of purifying urokinase, in high yield, from a variety of biological fluids.

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A Simple Synthesis of the Anticancer Drug Altretamine

Letters in Organic Chemistry ◽

10.2174/1570178617666200210111041 ◽

2020 ◽

Vol 17 (8) ◽

pp. 628-630

Author(s):

Vu Binh Duong ◽

Pham Van Hien ◽

Tran Thai Ngoc ◽

Phan Dinh Chau ◽

Tran Khac Vu

Keyword(s):

Aqueous Solution ◽

Anticancer Drug ◽

Potassium Hydroxide ◽

Large Scale ◽

Synthesis Method ◽

Practical Method ◽

Cyanuric Chloride ◽

Simple Synthesis ◽

High Yield ◽

One Step

A simple and practical method for the synthesis on a large scale of altretamine (1), a wellknown antitumor drug, has been successfully developed. The synthesis method involves the conversion of cyanuric chloride (2) into altretamine (1) by dimethylamination of 2 with an aqueous solution of 40% dimethylamine and potassium hydroxide in 1, -dioxan 4in one step to give altretamine (1) in high yield.

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Effect of Dynamic Crosslinking on Mechanical Properties of PP/EPDM Blends

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19932642 ◽

1993 ◽

Vol 58 (11) ◽

pp. 2642-2650 ◽

Cited By ~ 10

Author(s):

Zdeněk Kruliš ◽

Ivan Fortelný ◽

Josef Kovář

Keyword(s):

Mechanical Properties ◽

Impact Strength ◽

Shear Modulus ◽

High Impact ◽

Necessary Condition ◽

Step Method ◽

Melt Mixing ◽

One Step ◽

High Impact Strength ◽

Dynamic Curing

The effect of dynamic curing of PP/EPDM blends with sulfur and thiuram disulfide systems on their mechanical properties was studied. The results were interpreted using the knowledge of the formation of phase structure in the blends during their melt mixing. It was shown, that a sufficiently slow curing reaction is necessary if a high impact strength is to be obtained. Only in such case, a fine and homogeneous dispersion of elastomer can be formed, which is the necessary condition for high impact strength of the blend. Using an inhibitor of curing in the system and a one-step method of dynamic curing leads to an increase in impact strength of blends. From the comparison of shear modulus and impact strength values, it follows that, at the stiffness, the dynamically cured blends have higher impact strength than the uncured ones.

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