Publications by authors named "Sadegh Rostamnia"

27 Publications

  • Page 1 of 1

Application of magnetic nanoparticles by comparing the absorbance and stabilization of biomolecules DNA-C, L by the electrophoretic detection.

Int J Health Sci (Qassim) 2021 Mar-Apr;15(2):3-8

Department of Chemistry, Faculty of Science, University of Maragheh, Iran.

Objectives: The project is based on extensive studies on applied nanoparticles in biology and medicine. This study was primarily designed to investigate the role of magnetic nanoparticles by comparing the absorbance and stabilization of DNA-C, L by the electrophoretic detection.

Methods: FeO magnetic nanoparticles (MNPs) with core/shell structure of silica coatings were synthesized by a chemical coprecipitation method. This work is done at 15 min times with multitimes, that is, 20 numbers and nanoparticles are provided regular with good morphology which was synthesized in 20 nm in size, and its structure was analyzed by tools such as EDX analysis. Next, 20 mg of the magnetic nanoparticles were coated with silica in a heterogeneous solution at 25 μg/ml of the solution of each of the mixed DNAs (ring, linear) in separate containers. Finally, 15 minutes later, DNA was adsorbed on the surface of the nanoparticles. The amount of this adsorption was injected by spectrophotometry (UV-Vis, ith 99% accuracy and optimized by the standard Tris.HCl buffer required to separate DNA from its pure solution [unabsorbed DNA]) and electrophoresis.

Results: The results showed that absorption and diffusion of DNA-C or L at the surface of nanoparticles were 95% and 85%, respectively (i.e., absorbance of DNA-C>DNA-L is) with rate of removing of on MNPs was >99%. Hence, after review, we received that a linkage of electrostatic bonding between nanoparticles and biomolecules was obtained, and the results of the EDX analysis confirmed this study.

Conclusion: In this project, nanocomposites containing magnetic nanoparticles were synthesized and their structure was identified by relevant analyzes. It was then used to stabilize the biomolecules, which yielded competitive results between the two types of DNA (linear and cyclic) at 85 and 95% adsorption, respectively.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7934133PMC
March 2021

Application of novel nanomagnetic metal-organic frameworks as a catalyst for the synthesis of new pyridines and 1,4-dihydropyridines via a cooperative vinylogous anomeric based oxidation.

Sci Rep 2021 Mar 5;11(1):5279. Epub 2021 Mar 5.

Organic and Nano Group (ONG), Department of Chemistry, Iran University of Science and Technology (IUST), PO Box, 16846-13114, Tehran, Iran.

Herein, a new magnetic metal-organic frameworks based on FeO (NMMOFs) with porous and high surface area materials were synthesized. Then, NMMOFs were characterized by FT-IR, XRD, SEM, elemental mapping, energy dispersive X-ray (EDS), TG, DTG, VSM, and N adsorption-desorption isotherms (BET). FeO@Co(BDC)-NH as a magnetic porous catalyst was applied for synthesis of novel fused pyridines and 1,4-dihydropyridines with pyrazole and pyrimidine moieties as suitable drug candidates under ultrasonic irradiation. The significant advantages of the presented methodology are mild, facile workup, high yields, short reaction times, high thermal stability, and reusability of the described NMMOFs catalyst.
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http://dx.doi.org/10.1038/s41598-021-84005-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7935861PMC
March 2021

A novel ternary heterogeneous TiO/BiVO/NaY-Zeolite nanocomposite for photocatalytic degradation of microcystin-leucine arginine (MC-LR) under visible light.

Ecotoxicol Environ Saf 2021 Mar 8;210:111862. Epub 2021 Jan 8.

Department of Environmental Health Engineering, Maragheh University of Medical Sciences, Maragheh, Iran. Electronic address:

Microcystin-leucine arginine (MC-LR) is a carcinogenic toxin, produced by cyanobacteria. The release of this toxin into drinking water sources can threaten public health and environmental safety. Therefore, effective MC-LR removal from water resources is necessary. In the present study, the hydrothermal method was used to synthesize a novel ternary BiVO/TiO/NaY-Zeolite (B/T/N-Z) nanocomposite for MC-LR degradation under visible light. FESEM, FTIR, XRD, and DRS were performed for characterizing the nanocomposite structure. Also, the Response Surface Methodology (RSM) was applied to determine the impact of catalyst dosage, pH, and contact time on the MC-LR removal. High-performance liquid chromatography was performed to measure the MC-LR concentration. Based on the results, independent parameters, including contact time, catalyst dosage, and pH, significantly affected the MC-LR removal (P < 0.05). In other words, increasing the contact time, catalyst dosage, and acidic pH had positive effects on MC-LR removal. Among these variables, the catalyst dosage, with the mean square and F-value of 1041.37 and 162.84, respectively, had the greatest effect on the MC-LR removal efficiency. Apart from the interaction between the catalyst dosage and contact time, the interaction effects of other parameters were not significant. Also, the maximum MC-LR removal efficiency was 99.88% under optimal conditions (contact time = 120 min, catalyst dosage = 1 g/L, and pH = 5). According to the results, the B/T/N-Z nanocomposite, as a novel and effective photocatalyst could be used to degrade MC-LR from polluted water.
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http://dx.doi.org/10.1016/j.ecoenv.2020.111862DOI Listing
March 2021

Biosynthesis of AgNPs onto the urea-based periodic mesoporous organosilica (AgNPs/Ur-PMO) for antibacterial and cell viability assay.

J Colloid Interface Sci 2021 Mar 20;585:676-683. Epub 2020 Oct 20.

Department of Biophysics and Molecular Biology, Baku State University, Baku, Azerbaijan; Joint Ukraine-Azerbaijan International Research and Education Center of Nanobiotechnology and Functional Nanosystems, Drohobych, Ukraine & Baku, Azerbaijan.

Nano-size silver particles were stabilized on the inner surfaces of urea based periodic mesoporous organosilica (Ur-PMO). Aqueous extract of Euphorbia leaves as a sustainable and green reducing agent was applied for Ag-nanoparticles growth into the Ur-PMO channels. Physical and chemical properties of organosilica materials synthesized using various techniques such as FT-IR, small-angle XRD, PXRD, FESEM, TEM, SEM-EDX and atomic absorption spectrometry (AAS) were examined. Finally, the AgNPs/Ur-PMO were investigated on cell viability assay. An in vitro cytotoxicity test using MMT assay displayed that the designed material has good biocompatibility and could be a promising candidate for biomedical applications. The results also showed that the AgNPs/Ur-PMO compounds (especially, PMO; 1.27% AgNPs) had relatively good antibacterial and antibiofilm effects. It seems that the use of these compounds in hospital environments can reduce nosocomial infections as well as reduce antibiotic-resistant bacteria.
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http://dx.doi.org/10.1016/j.jcis.2020.10.047DOI Listing
March 2021

Anchoring Pd-nanoparticles on dithiocarbamate- functionalized SBA-15 for hydrogen generation from formic acid.

Sci Rep 2020 10 23;10(1):18188. Epub 2020 Oct 23.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO BOX, 55181-83111, Maragheh, Iran.

Hydrogen (H) generation from natural biological metabolic products has remained a huge challenge for the energy arena. However, designing a catalytic system with complementary properties including high surface area, high loading, and easy separation offers a promising route for efficient utilization of nanoreactors for prospective H suppliers to a fuel cell. Herein, selective dehydrogenation of formic acid (FA) as a natural biological metabolic product to H and CO gas mixtures has been studied by supporting ultrafine palladium nanoparticles on organosulfur-functionalized SBA-15 nanoreactor under ultrasonic irradiation. The effects of the porous structure as a nanoreactor, and organosulfur groups, which presented around the Pd due to their prominent roles in anchoring and stabilizing of Pd NPs, studied as a superior catalyst for selective dehydrogenation of FA. Whole catalytic systems were utilized in ultrasonic irradiation in the absence of additives to provide excellent TOF/TON values. It was found that propose catalyst is a greener, recyclable, and more suitable option for the large-scale application and provide some new insights into stabilization of ultra-fine metal nanoparticle for a variety of applications.
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http://dx.doi.org/10.1038/s41598-020-75369-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7584604PMC
October 2020

Synthesis of Metal-Organic Frameworks MIL-101(Cr)-NH Containing Phosphorous Acid Functional Groups: Application for the Synthesis of -Amino-2-pyridone and Pyrano [2,3-]pyrazole Derivatives via a Cooperative Vinylogous Anomeric-Based Oxidation.

ACS Omega 2020 Mar 20;5(12):6240-6249. Epub 2020 Mar 20.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55181-83111, Maragheh, Iran.

In the current paper, we successfully developed and used metal-organic frameworks (MOFs) based on MIL-101(Cr)-NH with phosphorus acid functional groups MIL-101(Cr)-N(CHPOH). The synthesized metal-organic frameworks (MOFs) as a multi-functional heterogeneous and nanoporous catalyst were used for the synthesis of -amino-2-pyridone and pyrano [2,3-]pyrazole derivatives via reaction of ethyl cyanoacetate or ethyl acetoacetate, hydrazine hydrate, malononitrile, and various aldehydes. The final step of the reaction mechanism was preceded by a cooperative vinylogous anomeric-based oxidation. Recycle and reusability of the described catalyst MIL-101(Cr)-N(CHPOH) were also investigated.
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http://dx.doi.org/10.1021/acsomega.9b02133DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114146PMC
March 2020

Boosting Aerobic Oxidation of Alcohols via Synergistic Effect between TEMPO and a Composite FeO/Cu-BDC/GO Nanocatalyst.

ACS Omega 2020 Mar 9;5(10):5182-5191. Epub 2020 Mar 9.

Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea.

Fabrication of a nanocomposite catalyst via a novel and efficient strategy remains a challenge; FeO nanoparticles anchored on graphene oxide (GO) sheet-supported metal-organic frameworks (MOFs). In this study, the physicochemical properties of the ensuing FeO/Cu-BDC/GO are investigated using Fourier transform infrared spectrum, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray detector, and atomic absorption spectroscopy. The salient features of the nanocomposite such as Cu-MOF, synergistic effect with GO sheets, and magnetic separation characteristics make it an excellent ternary heterostructure for aerobic oxidation of alcohols. The proposed nanocatalyst and co-catalyst 2,2,6,6-tetramethylpiperidine--oxyl substantially enhance the catalytic performance for the aerobic oxidation under very mild and sustainable reaction conditions. The heterogeneity of FeO/Cu-BDC/GO composite catalyst is affirmed with the added advantage that the initial activity is well maintained even after seven cycles.
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http://dx.doi.org/10.1021/acsomega.9b04209DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7081426PMC
March 2020

Formation and stabilization of colloidal ultra-small palladium nanoparticles on diamine-modified Cr-MIL-101: Synergic boost to hydrogen production from formic acid.

J Colloid Interface Sci 2020 May 1;567:126-135. Epub 2020 Feb 1.

Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea. Electronic address:

Ultra-small nano-sized palladium particles were successfully stabilized within the pores of diamine groups grafted open metal site metal-organic frameworks of Cr-MIL-101; coordinated diamine groups of ethylene diamine (ED) and propyl diamine (PD) on the active site of chromium units of Cr-MIL-101. The physiochemical properties of the Pd@Cr-MOFs were investigated using FTIR, XRD, SEM/EDX mapping, TEM, BET, and AAS. The Cr-MIL-101 stabilized ultra-small Pd nanoparticles, Pd@(ethylene diamine)/Cr-MIL-101, and Pd@(propyl diamine)/Cr-MIL-101, displayed catalytic activity for clean dehydrogenation of formic acid and generation of hydrogen at room temperature. The resultant Pd@ED/Cr-MIL-101 catalyst indicates high catalytic activity with turnover frequency (TOF) of 583 h at 328 K, which is superior to most of the reported catalysts, including Pd@PD/Cr-MIL-101 with TOF 532 h. Our studies open up a new method to the design of an ultra-small metal nanoparticle for the catalytic dehydrogenation of HCOOH.
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http://dx.doi.org/10.1016/j.jcis.2020.01.087DOI Listing
May 2020

Template-oriented synthesis of hydroxyapatite nanoplates for 3D bone printing.

J Mater Chem B 2019 12 30;7(45):7228-7234. Epub 2019 Oct 30.

School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.

The design of hydroxyapatite (HA) nanoarchitecture is critical for fabricating artificial bone tissues as it dictates the biochemical and the mechanical properties of the final product. Herein, we incorporated a simple hard-template approach to synthesise single crystal nanoplates of HA. We used the 2D graphitic nitride (g-CN) material to prepare an HA sol-gel under hydrothermal conditions. A new HA nanostructure was then formed during the calcination and removal of g-CN at a higher temperature, which finally led to the production of nanoplates (thickness of ∼100 nm) while in lateral dimension the average size was in the micrometre scale. We characterised the synthesised HA nanoplates with XRD, TEM, and HRTEM. The theoretically predicted nanostructure construction based on Wulff's method is in full agreement with the experimental observations. We then prepared different weight ratios of HA and polylactic acid (PLA) composites for artificial 3D bone fabrication. The strong interaction between PLA and HA's (110) facet, which was the second most prevalent, resulted in the composite's mechanical robustness. After mechanical testing, an optimum ratio was selected for biological studies and 3D printing. Biological experiments demonstrated that the synthesised composite had excellent viability in vitro.
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http://dx.doi.org/10.1039/c9tb01436eDOI Listing
December 2019

Zirconium based porous coordination polymer (PCP) bearing organocatalytic ligand: A promising dual catalytic center for ultrasonic heterocycle synthesis.

Ultrason Sonochem 2019 Nov 21;58:104653. Epub 2019 Jun 21.

Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran; Department of Materials Science and Nanotechnology Engineering, Faculty of Engineering, Near East University, 99138 Nicosia, Mersin 10, Turkey. Electronic address:

Herein, the efficient role of ultrasonic irradiation both in synthesis of Zr based porous coordination polymer (Zr-PCP) nanoparticles and boosting its catalytic activity, towards the benzimidazoles synthesis is represented. We use an amine based ligand (amino-terephthalate) for PCP and we exhibit that it can have a synergistic catalytic activity. In this work, a unique nano-engineering of cooperative and synergistic catalytic activity of zirconium, as a Lewis acid, and aminophenylene, as an organocatalyst, in the synthesis of heterocycles is presented for the synthesis of benzimidazole from cascade reaction of phenylene diamine with aldehyde at ambient temperature. Zr and amine groups of the Zr-PCP are active catalytic sites which in combination with the ultrasonic irradiation leads to a high selectivity and rapid catalytic production of benzylimidazoles. N adsorption-desorption along with BJH analyses confirm the microporosity of the catalyst and recyclability shows that the catalyst is green and sustainable heterogeneous microporous catalyst.
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http://dx.doi.org/10.1016/j.ultsonch.2019.104653DOI Listing
November 2019

Euphorbia leaf extract-assisted sustainable synthesis of Au NPs supported on exfoliated GO for superior activity on water purification: reduction of 4-NP and MB.

Environ Sci Pollut Res Int 2019 Apr 26;26(12):11719-11729. Epub 2019 Feb 26.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO Box 55181-83111, Maragheh, Iran.

In the present work, the effect of graphene oxide (GO) architecture and synthesis of gold nanoparticles (Au) on the surface of GO by using Euphorbia leaf extract was investigated. The as-synthesized catalyst was utilized for reduction of 4-nitrophenol (4-NP) and methylene-blue (MB). The ethanol/water extract of the leaves of Euphorbia was found as a non-toxic, suitable, eco-friendly natural reducing agent in one-step generation of Au nanoparticles onto the GO. The catalyst was characterized by different analysis such as atomic force microscopy, powder X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, SEM-mapping, transmission electron microscopy, and atomic absorption spectrometry. The high catalytic performance of the surfactant exfoliated gold-GO (SE-Au/GO) towards the reduction of 4-NP to 4-aminophenol (4-AP) and reduction of MB to leucomethylene blue (LMB) under mild conditions, in water and at room temperature, was exhibited. Graphical abstract.
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http://dx.doi.org/10.1007/s11356-019-04437-2DOI Listing
April 2019

Development of Sulfonic-Acid-Functionalized Mesoporous Materials: Synthesis and Catalytic Applications.

Chemistry 2019 Feb 20;25(7):1614-1635. Epub 2018 Nov 20.

International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.

Sulfonic acid based mesostructures (SAMs) have been developed in recent years and have important catalytic applications. The primary applications of these materials are in various organic synthesis reactions, such as multicomponent reactions, carbon-carbon bond couplings, protection reactions, and Fries and Beckman rearrangements. This review aims to provide an overview of the recent developments in the field of SAMs with a particular emphasis on the reaction scope and advantages of heterogeneous solid acid catalysts.
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http://dx.doi.org/10.1002/chem.201802183DOI Listing
February 2019

Interaction of Yarrowia lipolytica lipase with dithiocarbamate modified magnetic carbon FeO@C-NHCSH core-shell nanoparticles.

Int J Biol Macromol 2018 Oct 22;117:218-224. Epub 2018 May 22.

International Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. Electronic address:

FeO@C core-shell nanoparticles were modified by (3-aminopropyl)triethoxysilane (APTES) to generate amine functionality in the surface. Then, the amine functional groups were converted to dithiocarbamate via post-modification with carbon disulfide. This nanostructure with new functional property was used to immobilize lipase (obtained from Yarrowia lipolytica U6). Biocatalytic activity of the FeO@C-NHCS-LIP was studied in this project. The interaction of lipase and support though dithiocarbamate binder was examined in the hydrolysis of p-nitrophenyl laurate. In this paper, support showed a unique feature in the immobilization of lipase by maintaining the lipase activity, raising the stability of lipase, and reusability.
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http://dx.doi.org/10.1016/j.ijbiomac.2018.05.156DOI Listing
October 2018

A highly sensitive electrochemical sensor for the determination of methanol based on PdNPs@SBA-15-PrEn modified electrode.

Anal Biochem 2018 05 21;548:32-37. Epub 2018 Feb 21.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, Iran.

In this study, a novel electrochemical sensor for the determination of methanol based on palladium nanoparticles supported on Santa barbara amorphous-15- PrNHEtNH (PdNPs@SBA-15-PrEn) as nanocatalysis platform is presented. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical methods are employed to characterize the PdNPs@SBA-15-PrEn nanocomposite. The Nafion-Pd@SBA-15-PrEn modified glassy carbon electrode (Nafion-PdNPs@SBA-15-PrEn/GCE) displayed the high electrochemical activity and excellent catalytic characteristic for electro-oxidation of methanol in an alkaline solution. The electro-oxidation performance of the proposed sensor was investigated using cyclic voltammetry (CV) and amperometry. The sensor exhibits a good sensitivity of 0.0905 Amol Lcm, linear range of 20-1000 μM and the corresponding detection limit of 12 μM (3σ). The results demonstrate that the Nafion-PdNPs@SBA-15-PrEn/GCE has potential as an efficient and integrated sensor for methanol detection.
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http://dx.doi.org/10.1016/j.ab.2018.01.033DOI Listing
May 2018

Templated synthesis of atomically-thin Ag nanocrystal catalysts in the interstitial space of a layered silicate.

Chem Commun (Camb) 2018 Apr;54(35):4402-4405

International Center for Materials Nanoarchitechtonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

Enclosing functional nanoparticles in stable inorganic supports is important for generating ultra-stable catalytic active sites with good performance and material utilization efficiency. Here we describe a simple method to synthesize ultra-thin Ag nanocrystals with dimensions that are defined by the ∼1.4 nm 2D interlayer separating a layered silicate nanostructure. We call the particles "nanoplates" because they are <1.4 nm thick in one direction and their in-plane dimensions are defined by reaction time. The layered silicate is pillared with dialkylurea, which serves both as a reducing agent for the Ag precursor and immobilizes the Ag nanoplates in the interstitial nanospace. The supported Ag nanoplates showed catalytic activity for hydrolysis of NH3BH3 and generation of H2 at room temperature. These supported Ag nanocatalysts had performance much higher than spherical Ag nanoparticles. They, moreover, had performance and stability comparable to costly supported Pt nanoparticles.
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http://dx.doi.org/10.1039/c8cc00275dDOI Listing
April 2018

NH-coordinately immobilized tris(8-quinolinolato)iron onto the silica coated magnetite nanoparticle: FeO@SiO-FeQ as a selective Fenton-like catalyst for clean oxidation of sulfides.

J Colloid Interface Sci 2018 Feb 10;511:447-455. Epub 2017 Oct 10.

Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia. Electronic address:

A green, robust and eco-friendly procedure for the oxidation of aromatic organic sulfides to sulfones using HO catalyzed by NH-coordinately immobilized tris(8-quinolinolato)iron onto the silica coated magnetite (FeSiO) has been developed. Physicochemical properties of the resulting nanoparticles were investigated by means of techniques including X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, vibrating sample magnetometer, atomic adsorption spectroscopy and FT-IR spectroscopy. The catalytic activity of sulfides oxidation showed that this atom-economical protocol provided great yields of various sulfones and allowed the sulfide function reaction conducting under the mild conditions thus to prevent the sulfide being over-oxidized to sulfoxides. The FeO@SiO-FeQ catalysts are magnetically separable and kept stable after recycling for 7 consecutive runs without detectable activity loss.
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http://dx.doi.org/10.1016/j.jcis.2017.10.028DOI Listing
February 2018

Multivariate Optimization of a Functionalized SBA-15 Mesoporous Based Solid-Phase Extraction for U(VI) Determination in Water Samples.

Anal Sci 2017 ;33(7):769-776

Applied Chemistry Research Laboratory, Department of Chemistry, Faculty of Science, University of Zanjan.

A solid-phase extraction based on a functionalized SBA-15, with the Schiff base ligand, ethylenediaminepropylesalicylaldimine (SBA/EnSA), was developed for the recovery and preconcentration of trace amounts of uranium(VI) in water samples, prior to its determination spectrophotometrically using ArsenazoIII. For optimizing the parameters affecting the adsorption step (pH, adsorbent dose and adsorption time) and those influencing the desorption process (concentration and volume of eluent and desorption time), a statistical technique response surface methodology (RSM) was employed. The limit of detection and the linear dynamic range for the proposed method were 10 μg L, and 33.5 - 500 μg L, respectively. The adsorbent showed a high capacity (110.2 mg g) and the method allowed obtaining a preconcentration factor of 67. The inter- and intra-day relative standard deviations for a solution of 100 μg L (n = 5) were found to be 4.8 - 6.2%. The developed method was successfully applied for the determination of U(VI) in water samples.
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http://dx.doi.org/10.2116/analsci.33.769DOI Listing
January 2018

Covalently bonded pancreatic lipase onto the dithiocarbamate/chitosan-based magnetite: Stepwise fabrication of FeO@CS/NHCS-Lip as a novel and promising nanobiocatalyst.

Int J Biol Macromol 2017 Oct 1;103:1194-1200. Epub 2017 Jun 1.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO Box 55181-83111, Maragheh, Iran.

In the present paper, porcine pancreas lipase (PPL) was immobilized to a new version of magnetite via a novel stepwise dithiocarbamate/chitosan-based method in alternation to glutaraldehyde. Magnetic chitosan nanocomposite was post-modified to produce dithiocarbamate moieties on the surface through amine functions. Then, immobilization of lipase was successfully achieved on the surface of magnetically separable FeO@CS/NHCSH via a post-modification. Each step of immobilization was carefully monitored by characterization and all were successfully proved. Comparison of immobilized enzyme with free enzyme showed that the method of immobilization is efficient.
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http://dx.doi.org/10.1016/j.ijbiomac.2017.05.159DOI Listing
October 2017

Dithiocarbamate to modify magnetic graphene oxide nanocomposite (FeO-GO): A new strategy for covalent enzyme (lipase) immobilization to fabrication a new nanobiocatalyst for enzymatic hydrolysis of PNPD.

Int J Biol Macromol 2017 Aug 29;101:696-702. Epub 2017 Mar 29.

Department of Chemistry, Faculty of Science, Urmia University, Urmia 57159-165, Iran. Electronic address:

Immobilization of lipase was successfully achieved on the surface of magnetically separable FeO/graphene oxide (GO) via a post-modification. This post modification was achieved in alternation to glutaraldehyde post-modification. The activity of immobilized lipase had not a significant loss in the activity while on the other hand, it is simply extractable (by keeping its major activity) from reaction crude by a magnet. Each step of immobilization was carefully monitored by characterization and all were successfully proved. SEM, TEM, XRD, EDX, and FTIR were used to characterize the support and immobilization process.
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http://dx.doi.org/10.1016/j.ijbiomac.2017.03.152DOI Listing
August 2017

Covalently bonded sulfonic acid magnetic graphene oxide: Fe3O4@GO-Pr-SO3H as a powerful hybrid catalyst for synthesis of indazolophthalazinetriones.

J Colloid Interface Sci 2016 Sep 7;478:280-7. Epub 2016 Jun 7.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO Box 55181-83111, Maragheh, Iran. Electronic address:

Multistep synthesis of covalently sulfonated magnetic graphene oxide was achieved by starting from Hummer's method to produce graphene oxide (GO) from chemical oxidation of graphite. Then, GO nanosheets were applied to support Fe3O4 nanoparticles (Fe3O4@GO) using co-precipitation method in the presence of GO sheets. This strategy led to formation of uniform particles of Fe3O4 on the surface of GO sheets. Then, it was sulfonated (Fe3O4@GO-Pr-SO3H) through modification with 3-mercaptopropyltrimethoxysilane (MPTMS) and subsequent oxidation with hydrogen peroxide (H2O2). In comparison, the covalently bonded propyl sulfonic acid groups were more prevailing rather to sulfonic acids of GO itself. The proposed catalyst was more active and recyclable at least for 11 runs.
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http://dx.doi.org/10.1016/j.jcis.2016.06.020DOI Listing
September 2016

Evaluation of AgClNPs@SBA-15/IL nanoparticle-induced oxidative stress and DNA mutation in Escherichia coli.

Appl Microbiol Biotechnol 2016 Aug 21;100(16):7161-70. Epub 2016 May 21.

Department of Chemistry, Faculty of Science, University of Maragheh, Box 55181-83111, Maragheh, Iran.

The bactericidal effects of silver nanoparticles have been demonstrated in the past years. Recently, the new antimicrobial compounds of silver nanoparticles with different formulations have been developed. In this work, AgClNPs@SBA-15/IL as a new compound of Ag nanoparticles, was synthesized and characterized by XRD, TEM, SEM, FTIR, and EDX. The antibacterial activity and the molecular mechanism effects of AgClNPs@SBA-15/IL nanoparticles (SNPs) on Escherichia coli DH5α cells were investigated by analyzing the growth inhibitory, H2O2 level, catalase activity, DNA mutation, and plasmid copy number following treatment with AgClNPs@SBA-15/IL nanoparticles. In experimental results, the minimum inhibitory concentration (MIC) was observed in 75 μg/ml and the antibacterial efficacy (ABE) in CFU analysis was estimated 95.3 %. In bacterial cells treated with 75 and 100 μg/ml, H2O2 level significantly increased and catalase activity decreased compared with control. The random amplified polymorphic DNA (RAPD) was used to evaluate the effect of AgClNPs@SBA-15/IL nanoparticles in DNA damages and mutation in E. coli genome. RADP-PCR results indicated different banding patterns including appearance or disappearance of bands and differences in their intensity. Cluster analysis of the RAPD-PCR results based on genetic similarity showed genetic difference between E. coli cells treated with AgClNPs@SBA-15/IL nanoparticles, and control and phylogenetic tree were divided to two clusters. Plasmid copy number analysis indicated that after 8 h incubation of E. coli cells with 50, 75, and 100 μg/ml AgClNPs@SBA-15/IL nanoparticles, copy number of pET21a (+) significantly decreased compared with control which indicating DNA replication inhibition by Ag nanoparticles. In conclusion, the results of this study indicated that AgClNPs@SBA-15/IL nanoparticles can be used as an effective bactericidal agent against bacterial cells.
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http://dx.doi.org/10.1007/s00253-016-7593-6DOI Listing
August 2016

Controlled uptake and release of imatinib from ultrasound nanoparticles Cu3(BTC)2 metal-organic framework in comparison with bulk structure.

J Colloid Interface Sci 2016 Jun 12;471:112-117. Epub 2016 Mar 12.

Organic and Nano Group (ONG), Department of Chemistry, University of Maragheh, P.O. Box 55181-83111, Maragheh, Islamic Republic of Iran.

The porosity of metal-organic frameworks (MOFs) is an important point concerning the possible use of such functional materials for different purposes. In this work, we study uptake and release properties of imatinib (IM) from nano Cu(II)-MOF in comparison with bulk Cu(II)-MOF. To explore the absorption ability of the Cu(II)-MOF to IM, fresh sample of Cu3(BTC)2 was immersed in an aqueous solution of IM and were monitored in real time with UV/vis spectroscopy. Results show that the adsorbed quantity of IM over nano Cu3(BTC)2 (I) is much higher than those over a bulk Cu3(BTC)2 (II).
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http://dx.doi.org/10.1016/j.jcis.2016.03.018DOI Listing
June 2016

Pd-grafted open metal site copper-benzene-1,4-dicarboxylate metal organic frameworks (Cu-BDC MOF's) as promising interfacial catalysts for sustainable Suzuki coupling.

J Colloid Interface Sci 2016 May 13;469:310-317. Epub 2016 Feb 13.

Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. Electronic address:

In this work, open metal site metal-organic framework of Cu-BDC was selected as a support for the multi-step grafting of palladium. The palladium ions was coordinated onto the Schiff base-decorated Cu-BDC pore cage, that this bifunctional Pd@Cu-BDC/Py-SI catalyst was successfully applied for Suzuki cross-coupling reaction. Recyclability test for the Pd@Cu-BDC/Py-SI catalyst showed a successful reusability for 7 runs.
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http://dx.doi.org/10.1016/j.jcis.2016.02.021DOI Listing
May 2016

Removal of uranium(VI) ions from aqueous solutions using Schiff base functionalized SBA-15 mesoporous silica materials.

J Environ Manage 2016 Mar 22;169:8-17. Epub 2015 Dec 22.

Organic and Nano Group, Department of Chemistry, Faculty of Science, University of Maragheh, 55181-83111 Maragheh, Iran.

Functionalized SBA-15 mesoporous silica particles, bearing N-propylsalicylaldimine and ethylenediaminepropylesalicylaldimine Schiff base ligands, abbreviated as SBA/SA and SBA/EnSA respectively, were prepared and characterized by FT-IR, elemental analysis, TGA, XRD, TEM and SEM techniques. The potentials of these adsorbents were examined by using them in solid phase extraction of U(VI) ions from water samples. It is shown that 20 mg of SBA/SA or SBA/EnSA can remove rapidly (∼15 min) and quantitatively uranium(VI) ions from 10 to 200 mL of water solutions (pH 4) containing 0.2 mg of the ions, at 25 °C. The adsorbed ions were stripped by 1 mL of dilute nitric acid solution (0.1 mol L(-1)). It means that the studied adsorbents are able to be used for removal and concentration of uranyl ions. This allowed achieving to a concentration factor of 200 for uranyl ions. The variation in the ionic strength in the range 0-1 mol L(-1) did not affect the extraction efficiencies of the adsorbents. The adsorbents showed selective separation of uranyl ions from Cd(2+), Co(2+), Ni(2+), Mn(2+), Cr(3+), Ba(2+), Fe(3+) and Eu(3+) ions. Thermodynamic investigations revealed that the adsorption of uranyl ions by the adsorbents was spontaneous and endothermic. The Langmuir model described suitably the adsorption isotherms. This model determined the maximum adsorption capacity of the adsorbents SBA/SA and SBA/EnSA as 54 and 105.3 mg uranyl/g adsorbent, respectively. The kinetics of the processes was interpreted by using Pseudo-second-order model.
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http://dx.doi.org/10.1016/j.jenvman.2015.12.005DOI Listing
March 2016

Exfoliated Pd decorated graphene oxide nanosheets (PdNP-GO/P123): Non-toxic, ligandless and recyclable in greener Hiyama cross-coupling reaction.

J Colloid Interface Sci 2015 Aug 30;451:46-52. Epub 2015 Mar 30.

Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, PO Box 55181-83111, Maragheh, Iran.

Graphene oxide nanosheets were applied as a support for Pd nanoparticles in Hiyama reaction of various aryl halides and triethoxyphenylsilane to generate biaryl derivatives in aqueous conditions. Addition of surfactant during the catalysis caused a significant increase in yields of products through well-exfoliation of PdNP-GO. Among various studied surfactants, P123 showed superior activity rather to other surfactants, SDS and CTAB. This heterogeneous catalytic system has attained the advantages of being non-toxic, available, recyclable, ligand-free, and compatible to reaction medium.
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http://dx.doi.org/10.1016/j.jcis.2015.03.040DOI Listing
August 2015

Ordered interface mesoporous immobilized Pd pre-catalyst: En/Pd complexes embedded inside the SBA-15 as an active, reusable and selective phosphine-free hybrid catalyst for the water medium Heck coupling process.

J Colloid Interface Sci 2014 Oct 25;432:86-91. Epub 2014 Jun 25.

Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China.

A series of Pd-complexes of amine and diamine ligands embedded into the ordered silica mesoporous (PdX2@SBA-15/NY, Y=1, 2) are synthesized. Among them, the covalently bonded Pd(OAc)2/ethylenediamine complex into the SBA-15 exhibit higher activity and selectivity toward Mizoroki-Heck cross-coupling reaction. The Pd(OAc)2@SBA-15/En pre-catalyst could be separated easily from reaction products and used repetitively several times, showing the superiority over the homogeneous catalysts for industrial and chemical applications.
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http://dx.doi.org/10.1016/j.jcis.2014.06.011DOI Listing
October 2014

Novel three-component route to diastereoselective synthesis of trisubstituted vinylphosphonates using phosphites, acetylenic esters, and aroyl chlorides.

J Comb Chem 2009 Jan-Feb;11(1):143-5

Department of Chemistry, Tarbiat Modares University, Tehran, Iran.

Trisubstituted vinylphosphonates have been prepared via three-component reaction using phosphites, acetylenic esters, and aroyl chlorides in good yields. A variety of phosphites, activated acetylenes, and aroyl chlorides have been successfully employed in these reactions. In addition, three-component synthesis of vinylphosphonate provides exclusive E-olefin stereochemistry.
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http://dx.doi.org/10.1021/cc800128jDOI Listing
February 2009