Synthesis and Characterization of Dendrimer-Encapsulated Iron and Iron-Oxide Nanoparticles

Baykal, A.; Toprak, Muhammet S.; Durmuș, Z.; Şenel, Mehmet; Sözeri, H.; Demir, Ahmet

doi:10.1007/s10948-012-1454-z

Cited by 37 publications

(11 citation statements)

References 49 publications

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Section: Characterization Of the Nanoparticlesmentioning

confidence: 82%

“…Two types of iron are found in this sample corresponding to the two environments of Fe(II)/(III) in Fe 3 O 4 ( Figure 2b) [36,38]. The binding energies of the Fe 2p peak (~ 710.0 eV) and also the O1s peak ~529.5 eV strongly point to Fe 3 O 4 [36,38]. Moreover, oxygen peaks in two different environments could be assigned to species containing C=O and C-O [34,39].…”

Section: Characterization Of the Nanoparticlesmentioning

confidence: 84%

“…A closer examination of the G3-MNP spectrum reveals that the core material is indeed Fe 3 O 4 [36,37]. Two types of iron are found in this sample corresponding to the two environments of Fe(II)/(III) in Fe 3 O 4 ( Figure 2b) [36,38]. The binding energies of the Fe 2p peak (~ 710.0 eV) and also the O1s peak ~529.5 eV strongly point to Fe 3 O 4 [36,38].…”

Section: Characterization Of the Nanoparticlesmentioning

confidence: 98%

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Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Daumann

Larrabee

Ollis

et al. 2014

Journal of Inorganic Biochemistry

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Annually thousands of people die or suffer from organophosphate (pesticide) poisoning. In order to remove these toxic compounds from the environment, the use of enzymes as bioremediators has been proposed. We report here a Ser127Ala mutant based on the enzyme glycerophosphodiesterase (GpdQ) from Enterobacter aerogenes. The mutant, with improved metal binding abilities, has been immobilized using glutaraldehyde on PAMAM dendrimer-modified magnetite nanoparticles. The immobilized system was characterized using elemental analysis as well as infrared, transmission electron and X-ray photoelectron spectroscopies. The amount of GpdQ that was immobilized with the optimized procedure was 1.488 nmol per g MNP. A kinetic assay has been designed to evaluate the activity of the system towards organophosphoester substrates. The specific activity towards BPNPP directly after immobilization was 3.55 μmol mg -1 min -1 , after one week 3.39 μmol mg -1 min -1 and after 120 days 3.36 μmol mg -1 min -1 , demonstrating that the immobilized enzyme was active for multiple cycles and could be stored on the nanoparticles for a prolonged period.3

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Section: Characterization Of the Nanoparticlesmentioning

confidence: 82%

Section: Characterization Of the Nanoparticlesmentioning

confidence: 84%

Section: Characterization Of the Nanoparticlesmentioning

confidence: 98%

See 1 more Smart Citation

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Daumann

Larrabee

Ollis

et al. 2014

Journal of Inorganic Biochemistry

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“…Type I amide band with the wavenumber of 1630 cm -1 ) is generally related to C=O stretching vibration, which appertains to combination and structure of polymer backbone. Type II amide band with the wavenumber of 1571 cm -1 in G3 represents N-H bending vibration [53,54], which is eliminated during the gold and folic acid conjugation process while the band at 1630 cm -1 appeared without change. This shows that the gold nanoparticles interact with N-H groups in magnetodendrimer structure whereas the polymer backbone relatively remains as its pure structure.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Nanoplatform for Targeted Laser-induced Hyperthermia and Microscopy of Breast Cancer Cells using SPION-based Gold and Folic Acid Conjugated Nanodendrimers: An in vitro Assay

Khosroshahi¹,

Tajabadi²

2017

J Nanomed Nanotechnol

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“…Type II amide band (wave number 1570 cm −1 ) represents the N-H bending vibration (20%) [49]- [52]. As shown in Figure 6, FTIR spectra regarding IDA complex samples do not contain the band at 1570 cm −1 and the band 1630 cm −1 remain without any changes.…”

Section: Ftir and Wdx Evaluationmentioning

confidence: 96%

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

Tajabadi¹,

Khosroshahi²,

Bonakdar³

2015

OPJ

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In this study, 9 nm superparamagnetic iron oxide nanoparticles (SPION) were functionalized by polyamidoamine (PAMAM) dendrimer. Using tetracholoroauric acid (HAuCl 4 ), magnetodendrimer (MD) samples were conjugated by gold nanoparticles (Au-NPs). Two different reducing agents, i.e. sodium borohydride and hydrazine sulfate, and pre-synthesized 10-nm Au-NP were used to evaluate the efficiency of conjugation method. The samples were characterized using X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy and fluorescence spectroscopy. The results confirmed that AuNPs produced by sodium borohydrate and the pre-synthesized 10-nm Au-NPs were capped by MDs whereas the Au-NP prepared by hydrazine sulfate as a reducing agent was entrapped by MDs. Optical properties of the MDs were studied by laser-induced fluorescence spectroscopy (LIF) within a wide range of visible spectrum. Also, based on the thermal analysis, all synthesized nanostructures exhibited a temperature increase using 488 nm and 514 nm wavelengths of a tunable argon laser. The new iron oxide-dendrimer-Au NPs synthesized by sodium borohydrate (IDANaBH4) produced the highest temperature increase at 488 nm whereas the other nanostructures particularly pure Au-NPs produced more heating effect at 514 nm. These findings suggest the potential application of these nanocomposites in the field of bioimaging, targeted drug delivery and controlled hyperthermia. M. Tajabadi et al.213

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Synthesis and Characterization of Dendrimer-Encapsulated Iron and Iron-Oxide Nanoparticles

Cited by 37 publications

References 49 publications

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Multifunctional Nanoplatform for Targeted Laser-induced Hyperthermia and Microscopy of Breast Cancer Cells using SPION-based Gold and Folic Acid Conjugated Nanodendrimers: An in vitro Assay

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

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