Surface modification of magnetic nanoparticles with oleylamine and gum Arabic

Wilson, Otto C.; Blair, Erin; Kennedy, Stephanie C.; Rivera, Gloryvee; Mehl, Patrick M.

doi:10.1016/j.msec.2007.04.008

Cited by 30 publications

(17 citation statements)

References 13 publications

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“…HEK293 cell cultures were grown in the presence of non-coated (MNP) or coated particles (MNP_GA ADS , MNP_GA APTS and MNP_GA EDC ). Cells showing MNPs at their surface could be observed after only 30 min of incubation (the shortest period tested), which confirms the great affinity of the magnetic particles towards the cells (Berry et al, 2004;Gupta and Curtis, 2004;Wilson et al, 2008). Our primary goal was to assess if the GA coating could change the way MNPs interfere with the cell cultures and affect their growth.…”

Section: Resultsmentioning

confidence: 74%

“…The most important applications of GA are in the food and pharmaceutical industries where it is used as an excellent emulsifier (Yadav et al, 2007), therefore being recognised as non-toxic for humans (Ali et al, 2009). Recently, GA has been regarded as an alternative biopolymer for the coating and stabilization of nanostructures, including carbon nanotubes (Bandyopadhyaya et al, 2002;Kumar et al, 2008), gold nanoparticles (Kattumuri et al, 2007) and iron oxide nanoparticles (Williams et al, 2006;Banerjee and Chen, 2007a, b;Banerjee and Chen, 2008a, b;Roque and Wilson, 2008;Wilson et al, 2008). In fact, GA showed to be an effective agent to improve colloid stability, enabling for example the production of a magnetic nanocarrier for targeted anticancer drug delivery by grafting cyclodextrin onto GA-modified MNPs (Banerjee and Chen, 2008a).…”

Section: Introductionmentioning

confidence: 99%

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In vitro studies with mammalian cell lines and gum arabic‐coated magnetic nanoparticles

Bicho

Roque

Cardoso

et al. 2010

J of Molecular Recognition

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Iron oxide magnetic nanoparticles (MNPs) were synthesized by the chemical co-precipitation method and coated with gum arabic (GA) by physical adsorption and covalent attachment. Cultures of mammalian cell lines (HEK293, CHO and TE671) were grown in the presence of uncoated and GA-coated MNPs. Cellular growth was followed by optical microscopy in order to assess the proportion of cells with particles, alterations in cellular density and the presence of debris. The in vitro assays demonstrated that cells from different origins are affected differently by the presence of the nanoparticles. Also, the methods followed for GA coating of MNPs endow distinct surface characteristics that probably underlie the observed differences when in contact with the cells. In general, the nanoparticles to which the GA was adsorbed had a smaller ability to attach to the cells' surface and to compromise the viability of the cultures.

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

In vitro studies with mammalian cell lines and gum arabic‐coated magnetic nanoparticles

Bicho

Roque

Cardoso

et al. 2010

J of Molecular Recognition

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“…2 We used various surfactants in order to disperse and selectively remove the unsupported MoS 2 from the sonochemically prepared catalysts. For example, oleylamine [12,13] and oleic acid [14,15], known surfactants for producing nanoparticles and dispersing agglomerates toward small particles, were added to the slurry solution containing the sonochemically prepared supported and unsupported MoS 2 or pure Al 2 O 3 in n-hexane solvent, and the solution was subsequently agitated in an ultrasonic bath for 1 h. By adding oleylamine, agglomerates of the unsupported MoS 2 , which were initially located at the bottom of the container due to their specific density larger than that of n-hexane, were disintegrated into smaller particles and suspended in the solution. On the other hand, no change was observed by adding oleic acid to the solution.…”

Section: Evaluation Of the Hds Activitymentioning

confidence: 99%

Properties of unsupported MoS2 species produced in the preparation of MoS2/Al2O3 using a sonochemical method

Koh

Cho

et al. 2009

Korean J. Chem. Eng.

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Unsupported MoS 2 particles, which were produced in the preparation of MoS 2 /Al 2 O 3 using a sonochemical method, were successfully separated from the prepared sample catalyst by adding oleylamine as an agent for dispersing the unsupported particles. The fraction of the unsupported MoS 2 , which was estimated based on Mo balance, varied between 0.03 and 0.4, independent of the Mo loading levels investigated (6-54 wt% of Mo). The activity of the unsupported MoS 2 for the hydrodesulfurization of dibenzothiophene was nearly the same as that of the Al 2 O 3 -supported MoS 2 , indicating that the activity of the prepared catalyst was not affected by the presence of the unsupported MoS 2 particles.

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“…Copper [37]; and some of the noble metals nano particle are prepared in the presence gum arabic [38] [39]. In addition, gum arabic is used in preparation of calcite [40], and magnetic nanoparticles [41].…”

Section: Introductionmentioning

confidence: 99%

Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide

Saraya¹,

Rokbaa²

2017

ANP

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This paper aimed to study the effects of natural polysaccharide (gum arabic, GA) on the formation of vaterite calcium carbonate and its stability in aqueous solution. Gum arabic is a macromolecule that has a high molecular weight and is amphoteric in character. A 0, 2.5, 5 or 10 ml of GA solution (30%) was added to the calcium chloride solution with various initial concentrations to prepare the vaterite calcium carbonate. The calcium carbonate particles were characterized using FTIR, XRD, SEM, TEM and DSC-TG as well as calculation of phase contents. The results of XRD and FTIR analysis were showing that the presence of GA during the precipitation changes the behavior of calcium carbonate to form vaterite until at lower dose used. In addition, the molar content of vaterite increased at the expense of content of calcite with increasing the GA dose. There are slightly improvements in the vaterite content by increasing the initial concentration. The formed vaterite calcium carbonates composed of aggregates as broccoli-like or spherical shape and with particle size 1.6 -2.5 µm in diameter. TEM images showed that these aggregates composed of the sub spherical unit with diameter 15 -30 nm. The thermal behavior of prepared vaterite was conformed the mineral composition of these phases. The prepared calcium carbonate, which is formed in the presence of different doses of gum, has a stability in the aqueous solutions at different temperatures, as the analyzes indicated that a very small percentage of the vaterite were converted to calcite. The gum arabic prevented or depressed the transformation of vaterite to calcite through capped the surface of particles, i.e. it is more effective in stabilizing the vaterite phase with increasing in initial concentration and time.

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Surface modification of magnetic nanoparticles with oleylamine and gum Arabic

Cited by 30 publications

References 13 publications

In vitro studies with mammalian cell lines and gum arabic‐coated magnetic nanoparticles

In vitro studies with mammalian cell lines and gum arabic‐coated magnetic nanoparticles

Properties of unsupported MoS2 species produced in the preparation of MoS2/Al2O3 using a sonochemical method

Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide

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