N-[(3-trimethoxysilyl) propyl] EDTA trisodium salt (50% in water) was received from Gelest Inc., U.S.A. The water used throughout this work was of reagent grade produced by a Milli-Q water purification system. DMEM (Dulbecco’s modified Eagle’s medium), FBS (foetal bovine serum) and PenStrep (penicillin–streptomycin) were purchased from Biological Industries Inc. Fe3O4 nanoparticles were synthesized as described Selleckchem FDA-approved Drug Library by Jana et al. [20]
with slight modifications. In a typical synthesis of iron–oleate complex, 2.55 g of iron chloride (FeCl3.6H2O) was dissolved in 100 ml of methanol and 11 ml of oleic acid under continuous stirring. Another solution prepared by dissolving 1.6 g of NaOH in 200 ml of methanol was added to the above solution in stirring condition. The observed brown precipitate of iron oleate was washed with methanol and dried under vacuum overnight to remove the solvent. 4.02 g of synthesized solid mass was dissolved in 30 ml of 1-octadecene at 70 °C to make stock solution. Thereafter, 10 ml of stock solution was mixed with 40 ml of 1-octadecene and 0.1 equiv. of oleic acid and the solution DZNeP was heated to 280 °C for 30 min in an inert environment. When the reaction was complete, the mixture
was precipitated twice with ethanol. Resulting precipitate was re-dispersed in hexane for further use. Synthesized nanoparticles are stable in nonpolar solvents (such as hexane) and capped with nonpolar end groups on their surface. Oleic acid is widely used in Org 27569 the synthesis of iron oxide nanoparticles because it can form a dense protective monolayer, thereby, producing highly uniform and monodisperse
particles [6]. For the synthesis of iron oxide nanoparticles (INPs) suitable for biological applications, the hydrophobic surfactant coating needs to be replaced by a hydrophilic, biocompatible, and functional coating that allows controlled interaction of nanoparticles with biological species. The oleic acid on the particle surface was replaced with a COOH containing silane using a method reported by Palma et al. [21]. Once functionalized with a carboxylic group, nanoparticles were further functionalized using chitosan oligosaccharide method developed by López-Cruz et al. [22]. Amino group of chitosan oligosaccharide was covalently bonded with terminal carboxylic group of silane functionalized iron oxide nanoparticles through carbodiimide activation by the reaction of EDC and NHS [23]. TEM images were recorded on a JEOL 2100F TEM, operated at an accelerating voltage of 200 kV. Samples were prepared by adding 10 μl of the nanoparticles solution on 200-mesh carbon coated Cu grids. For the rapid counting of nanoparticles, TEM images were further processed by NIH Image J software [24]. Powder X-ray diffraction (XRD) studies were carried out through a Philips1820 advance diffractometer equipped with Ni-filtered Cu Kα radiation maintaining the scan rate of 0.24° per minute.
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