Preparation of novel magnetic fluorescent nanoparticles using amino acids

Ebrahiminezhad, Alireza; Ghasemi, Younes; Rasoul‐Amini, Sara; Barar, Jaleh; Davaran, Soodabeh

doi:10.1016/j.colsurfb.2012.08.046

Cited by 95 publications

(54 citation statements)

References 29 publications

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“…The C=O of citric acid appeared at 1638 cm −1 [51]. Arg-MNPs showed amine peak between 3410 and 3450 cm −1 , a C=O peak at 1634.9 cm −1 , and a CH 2 stretching band at 2923.2 cm −1 [52]. APTMS-MNPs were characterized by the CH 2 stretching which appeared at 2920.8 and 2851.3 cm obtained in previous reports indicating successful fictionalization of the prepared MNPs.…”

Section: Mnps ( G/ml)mentioning

confidence: 54%

Effect of Surface Charge and Hydrophobicity Modulation on the Antibacterial and Antibiofilm Potential of Magnetic Iron Nanoparticles

Shebl

Farouk

Azzazy

2017

Journal of Nanomaterials

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Unmodified magnetic nanoparticles (MNPs) lack antibacterial potential. We investigated MNPs surface modifications that can impart antibacterial activity. Six MNPs species were prepared and characterized. Their antibacterial and antibiofilm potentials, surface affinity, and cytotoxicity were evaluated. Prepared MNPs were functionalized with citric acid, amine group, amino-propyl trimethoxy silane (APTMS), arginine, or oleic acid (OA) to give hydrophilic and hydrophobic MNPs with surface charge ranging from −30 to +30 mV. Prepared MNPs were spherical in shape with an average size of 6-15 nm. Hydrophobic (OA-MNPs) and positively charged MNPs (APTMS-MNPs) had significant concentration dependent antibacterial effect. OA-MNPs showed higher inhibitory potential against S. aureus and E. coli (80%) than APTMS-MNPs (70%). Both particles exhibited surface affinity to S. aureus and E. coli. Different concentrations of OA-MNPs decreased S. aureus and E. coli biofilm formation by 50-90%, while APTMS-MNPs reduced it by 30-90%, respectively. Up to 90% of preformed biofilms of S. aureus and E. coli were destroyed by OAMNPs and APTMS-MNPs. In conclusion, surface positivity and hydrophobicity enhance antibacterial and antibiofilm properties of MNPs.

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Section: Mnps ( G/ml)mentioning

confidence: 54%

Effect of Surface Charge and Hydrophobicity Modulation on the Antibacterial and Antibiofilm Potential of Magnetic Iron Nanoparticles

Shebl

Farouk

Azzazy

2017

Journal of Nanomaterials

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“…X-ray powder diffraction (XRD, Siemens D5000) analysis was done to determine the crystallinity of prepared AgNPs. Functional groups of the phytochemicals which coat the prepared nanoparticles were determined by Fourier transformed infrared spectroscopy (Bruker, Vertex 70, FTIR Spectrometer) (Ebrahiminezhad et al, 2013;Gholami et al, 2015).…”

Section: Characterization Of Silver Nanoparticlesmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles using Mediterranean Cypress (<i>Cupressus sempervirens</i>) Leaf Extract

Ebrahiminezhad¹,

Taghizadeh²,

Ghasemi³

2017

American Journal of Biochemistry and Biotechnology

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Silver nanoparticles (AgNPs) retained vast applications in science and technology. Due to the vast application of these particles in various disciplines, there is an interest for synthesis of AgNPs in an environmentally friendly and economic manner. For the first time we were used Mediterranean cypress (Cupressus sempervirens) leaf aqueous extract for biosynthesis of AgNPs. Prepared particles were in various shapes and their diameters were ranging from 10 to 80 nm. TEM micrographs were shown that AgNPs are capped with a biologic matrix. FTIR analysis indicates hydrophilic functional groups in the capping matrix which can improve the stability of AgNPs.

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“…This phenomenon is due to the coordination of unsaturated surface iron atoms with water molecules as well as hydroxyl ions (Ebrahiminezhad et al 2012). The OH groups absorb infrared waves at 3434/cm (stretching point) and 1629/cm (deforming point) (Ebrahiminezhad et al 2012(Ebrahiminezhad et al , 2013Islam et al 2012;Wei Wang et al 2012).…”

Section: Synthesis and Characterization Of Ionsmentioning

confidence: 99%

Magnetic immobilization of Bacillus subtilis natto cells for menaquinone-7 fermentation

Ebrahiminezhad

Varma

Yang

et al. 2015

Appl Microbiol Biotechnol

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Production of menaquinone-7 (MK-7) by Bacillus subtilis natto is associated with major drawbacks. To address the current challenges in MK-7 fermentation, studying the effect of magnetic nanoparticles on the bacterial cells can open up a new domain for intensified bioprocesses. This article introduces the new concept of application of iron oxide nanoparticles (IONs) as a pioneer tool for MK-7 process intensification. In this order, IONs with the average size of 11 nm were successfully fabricated and characterized for possible in situ removal of target substances from the fermentation media. The prepared particles were used for decoration and immobilization of B. subtilis natto cells. Presence of iron oxide nanoparticles significantly enhanced the MK-7 specific yield (15 %) as compared to the control samples. In addition, fabricated IONs showed a promising ability for in situ recovery of bacterial cells from the fermentation media with more than 95 % capture efficiency. Based on the results, IONs can be implemented successfully as a novel tool for MK-7 production. This study provides a considerable interest for industrial application of magnetic nanoparticles and their future role in designing an intensified biological process.

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Preparation of novel magnetic fluorescent nanoparticles using amino acids

Cited by 95 publications

References 29 publications

Effect of Surface Charge and Hydrophobicity Modulation on the Antibacterial and Antibiofilm Potential of Magnetic Iron Nanoparticles

Effect of Surface Charge and Hydrophobicity Modulation on the Antibacterial and Antibiofilm Potential of Magnetic Iron Nanoparticles

Green Synthesis of Silver Nanoparticles using Mediterranean Cypress (<i>Cupressus sempervirens</i>) Leaf Extract

Magnetic immobilization of Bacillus subtilis natto cells for menaquinone-7 fermentation

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