Surface Modification of Magnetic Nanoparticles Using Gum Arabic

Williams, Darryl; Gold, Katie A.; Holoman, Tracey R. Pulliam; Ehrman, Sheryl H.; Wilson, Otto C.

doi:10.1007/s11051-006-9084-7

Cited by 98 publications

(49 citation statements)

References 10 publications

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“…GA is known as a natural and harmless polysaccharide derived from acacia trees. Due to its well steric stabilization effect as adsorbing on the surfaces of colloids and its numerous functional groups such as carboxylate and amine groups, it has been widely used as emulsifiers and capping agents [16][17][18][19][20][21][22]. In addition, it is also known that GA consists of mainly three distinctive fractions which are referred as arabinogalactan (AG, 88.4% of the total) with a low protein content (0.44% w/ w), arabinogalactan-protein (AGP, 10.4% of the total) with a high protein content of 9.18% w/w, and glycoprotein (GP, about 1% of the total) with a protein content of 50% w/w [23][24].…”

Section: Introductionmentioning

confidence: 99%

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Chen

2010

Gold Bull

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A facile, completely green, and cheap route for the synthesis of Au nanoparticles at 25-75°C has been developed by using only hydrogen tetrachloroaurate as the precursor and gum arabic (GA) simultaneously as a reducing agent and a stabilizing agent. No extra reagents are needed. From the analyses of UV/VIS absorption spectra, TEM, HRTEM, SAED, and XRD patterns, the formation of Au nanoparticles with a fcc structure was recognized. The synthesis reaction was usually finished in 2-4 h. Increasing the reaction temperature increased the formation rate but had no significant effect on the optical property and size of Au nanoparticles. With increasing Au(III) ion concentration or GA concentration, the mean diameter of Au nanoparticles slightly increased. Also, the particle size distribution became broader at higher Au(III) ion concentration or lower GA concentration due to the insufficient protection. Although raising the GA concentration was helpful to reduce Au(III) ions completely and stabilize the Au nanoparticles, too high GA concentration was not suitable for the stabilization of Au nanoparticles because the increased intermolecular force of GA might hinder the dispersion of Au nanoparticles. Furthermore, the resultant Au nanoparticles were found to remain highly stable in the NaCl solution.

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Section: Introductionmentioning

confidence: 99%

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Chen

2010

Gold Bull

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“…For instance, the large skeletal chain of PVP provide steric hindering against aggregation among the nanoparticles. Pectin and other heteropolymers from natural sources such as gum arabic, 34 carrageenan, 35 chitosan 36 and heparin 37 have also similar properties that allow them accomplish as reliable stabilizing agents for metal colloidal systems by forming a protective coating that prevents eventual precipitation. 38 The condensation kinetics, shape tuning and long term stability of colloidal metal particles depends strongly on the geometry and chemistry of metal precursors, templating-, stabilising-as well as reducing agents and solvents.…”

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confidence: 99%

Orange pectin mediated growth and stability of aqueous gold and silver nanocolloids

Nigoghossian

Santos

Barud

et al. 2015

Applied Surface Science

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The role of orange based pectin in the nucleation and growth of silver and gold nanoparticles is addressed. Pectin is a complex polysaccharide found in fruits such as oranges, lemons, passion fruits or apples. It displays smooth and hairy chain regions containing hydroxyl-, ester-, carboxylate-and eventually amine groups that can act as surface ligands interacting under various pH conditions more or less efficiently with growing nanometals. Here, a high methoxy pectin (> 50% esterified) was used as a stabilizer/reducing agent in the preparation of gold, silver and silver-gold nanoparticles. Commercial pectin (CP) and pectin extracted from orange bagasse (OP) were used. Optionally, trisodium citrate or oxalic acid we used to reduce AgNO 3 and HAuCl 4 in aqueous environment. Characterization methods included UV-VIS absorption spectroscopy, transmission electron microscopy, electron diffraction and energy-dispersive x-ray spectroscopy. The results show that under different pH conditions, pectin and reducing agents allow producing various nanostructures shapes (triangles, spheres, rods, octahedrons and decahedrons) often with high polydispersity and sizes ranging between 5 nm and 30 nm. In addition, depending on Ag/Au-ratio and pH, the surface plasmon bands can be continuously shifted between 410 nm and 600 nm. Finally, pectin seems to be a highly efficient stabilizer of the colloidal systems that show a remarkable stability and unchanged optical spectral response even after five years.

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“…One common class of compounds are synthetic and natural hydrophilic polymers such as poly(ethylene glycol) (PEG) [16,17], poly(vinyl alcohol) (PVA) [18][19][20], poly(Llysine) (PLL) [21], poly(acrylic acid) (PAA) [22], dextran [23][24][25][26][27], alginate [28][29][30], chitosan [31][32][33], starch [34][35][36], and gum Arabic [37][38][39] to name a few. These materials are effective at creating a neutral and hydrophilic surface that can resist protein adsorption, however they also come with the drawback of increasing a particle's hydrodynamic size.…”

Section: Coating Agentsmentioning

confidence: 99%

Nanotechnology and Diagnostic Imaging: New Advances in Contrast Agent Technology

Rosen¹,

Yoffe²,

Meerasa³

2011

J Nanomedic Nanotechnol

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Medical imaging technologies allow for the rapid diagnosis and evaluation of a wide range of pathologies. In order to increase their sensitivity and utility, many imaging technologies such as CT and MRI rely on intravenously administered contrast agents. While the current generation of contrast agents has enabled rapid diagnosis, they still suffer from many undesirable drawbacks including a lack of tissue specificity and systemic toxicity issues. Through advances made in nanotechnology and materials science, researchers are now creating a new generation of contrast agents that overcome many of these challenges, and are capable of providing more sensitive and specific information. In this review, we summarize the main classes of nanotechnology-based contrast agents for each of the major imaging technologies, and highlight progress in their development as well as the challenges to be addressed. We also review the relevant biological interactions that determine the in vivo fate of these contrast agents, and describe major themes in medical nanotechnology including stealth and targeting.

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Surface Modification of Magnetic Nanoparticles Using Gum Arabic

Cited by 98 publications

References 10 publications

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Facile green synthesis of gold nanoparticles with gum arabic as a stabilizing agent and reducing agent

Orange pectin mediated growth and stability of aqueous gold and silver nanocolloids

Nanotechnology and Diagnostic Imaging: New Advances in Contrast Agent Technology

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