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Csicsor A, Tombácz E. Antioxidant Effect of Humic Substances from Hungarian Leonardite. Hung J Ind Chem 2022. [DOI: 10.33927/hjic-2022-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Humic substances are natural substances that are continuously formed from the decay of plant residues. These materials have a very diverse range of properties, making them versatile. According to many new studies, these humic substances also exhibit antioxidant propensities. The aim of this paper was to shed light on whether humic substances really have antioxidant properties.
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Csicsor A, Tombácz E. Screening of Humic Substances Extracted from Leonardite for Free Radical Scavenging Activity Using DPPH Method. Molecules 2022; 27:molecules27196334. [PMID: 36234869 PMCID: PMC9571906 DOI: 10.3390/molecules27196334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/15/2022] [Accepted: 09/22/2022] [Indexed: 11/16/2022] Open
Abstract
Humic substances (HSs) have been researched for a long time and still manage to surprise humanity today. According to the latest research, in addition to their previously well-known effects, they also have antioxidant properties. However, this previous research does not examine the difference in the antioxidant effect of the fractions extracted/produced in different processes; they do not consider the light absorption of the HSs, which falsifies analysis based on the measurement of color change over time. In the present work, HS fractions were obtained from leonardite, the extraction processes can also be implemented on an industrial scale. The fractions were characterized by elementary analysis, UV–Vis and FT-IR spectroscopies, to prove that our self-extracted samples have similar characteristics to the International Humic Substances Society (IHSS) standard samples. The different methods of HS fractionation affected the elemental composition, and the spectral characteristics. The antioxidant effect was investigated using the DPPH method to screen the antioxidant efficiency of humic, fulvic, and himatomelanic acids. In addition, we compared our results with the IHSS standard samples to obtain a more comprehensive picture of the antioxidant effect of HSs extracted in different ways according to the DPPH method. Based on our results, the extraction method affects not only the physico-chemical properties but also the free radical scavenging activity of the fractions.
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Affiliation(s)
- Attila Csicsor
- Doctoral School of Environmental Sciences, University of Szeged, Rerrich Béla tér 1., H-6720 Szeged, Hungary
- Hymato Products Ltd., Kossuth u 33., H-8225 Szentkirályszabadja, Hungary
- Correspondence: ; Tel.: +36-703897852
| | - Etelka Tombácz
- Soós Ernő Water Technology Research and Development Center, University of Pannonia, H-8200 Veszprém, Hungary
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Mlih R, Liang Y, Zhang M, Tombácz E, Bol R, Klumpp E. Transport and Retention of Poly(Acrylic Acid-co-Maleic Acid) Coated Magnetite Nanoparticles in Porous Media: Effect of Input Concentration, Ionic Strength and Grain Size. Nanomaterials (Basel) 2022; 12:nano12091536. [PMID: 35564244 PMCID: PMC9103219 DOI: 10.3390/nano12091536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 04/27/2022] [Accepted: 04/28/2022] [Indexed: 12/04/2022]
Abstract
Understanding the physicochemical factors affecting nanoparticle transport in porous media is critical for their environmental application. Water-saturated column experiments were conducted to investigate the effects of input concentration (Co), ionic strength (IS), and sand grain size on the transport of poly(acrylic acid-co-maleic acid) coated magnetite nanoparticles (PAM@MNP). Mass recoveries in the column effluent ranged from 45.2 to 99.3%. The highest relative retention of PAM@MNP was observed for the lowest Co. Smaller Co also resulted in higher relative retention (39.8%) when IS increased to 10 mM. However, relative retention became much less sensitive to solution IS as Co increased. The high mobility is attributed to the PAM coating provoking steric stability of PAM@MNP against homoaggregation. PAM@MNP retention was about 10-fold higher for smaller grain sizes, i.e., 240 µm and 350 µm versus 607 µm. The simulated maximum retained concentration on the solid phase (Smax) and retention rate coefficient (k1) increased with decreasing Co and grain sizes, reflecting higher retention rates at these parameters. The study revealed under various IS for the first time the high mobility premise of polymer-coated magnetite nanoparticles at realistic (<10 mg L−1) environmental concentrations, thereby highlighting an untapped potential for novel environmental PAM@MNP application usage.
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Affiliation(s)
- Rawan Mlih
- Institute of Bio- and Geosciences, Agrosphere (IBG-3), Research Centre Juelich (FZJ), 52425 Juelich, Germany
- Institute for Environmental Research, Biology 5, RWTH Aachen University, 52074 Aachen, Germany
| | - Yan Liang
- School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
| | - Miaoyue Zhang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Etelka Tombácz
- Soós Ernő Water Technology Research and Development Center, University of Pannonia, H-8800 Nagykanizsa, Hungary
| | - Roland Bol
- Institute of Bio- and Geosciences, Agrosphere (IBG-3), Research Centre Juelich (FZJ), 52425 Juelich, Germany
- School of Natural Sciences, Environment Centre Wales, Bangor University, Bangor LL57 2DG, UK
| | - Erwin Klumpp
- Institute of Bio- and Geosciences, Agrosphere (IBG-3), Research Centre Juelich (FZJ), 52425 Juelich, Germany
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Veres T, Voniatis C, Molnár K, Nesztor D, Fehér D, Ferencz A, Gresits I, Thuróczy G, Márkus BG, Simon F, Nemes NM, García-Hernández M, Reiniger L, Horváth I, Máthé D, Szigeti K, Tombácz E, Jedlovszky-Hajdu A. An Implantable Magneto-Responsive Poly(aspartamide) Based Electrospun Scaffold for Hyperthermia Treatment. Nanomaterials (Basel) 2022; 12:nano12091476. [PMID: 35564185 PMCID: PMC9101327 DOI: 10.3390/nano12091476] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/15/2022] [Accepted: 04/22/2022] [Indexed: 02/06/2023]
Abstract
When exposed to an alternating magnetic field, superparamagnetic nanoparticles can elicit the required hyperthermic effect while also being excellent magnetic resonance imaging (MRI) contrast agents. Their main drawback is that they diffuse out of the area of interest in one or two days, thus preventing a continuous application during the typical several-cycle multi-week treatment. To solve this issue, our aim was to synthesise an implantable, biodegradable membrane infused with magnetite that enabled long-term treatment while having adequate MRI contrast and hyperthermic capabilities. To immobilise the nanoparticles inside the scaffold, they were synthesised inside hydrogel fibres. First, polysuccinimide (PSI) fibres were produced by electrospinning and crosslinked, and then, magnetitc iron oxide nanoparticles (MIONs) were synthesised inside and in-between the fibres of the hydrogel membranes with the well-known co-precipitation method. The attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR) investigation proved the success of the chemical synthesis and the presence of iron oxide, and the superconducting quantum interference device (SQUID) study revealed their superparamagnetic property. The magnetic hyperthermia efficiency of the samples was significant. The given alternating current (AC) magnetic field could induce a temperature rise of 5 °C (from 37 °C to 42 °C) in less than 2 min even for five quick heat-cool cycles or for five consecutive days without considerable heat generation loss in the samples. Short-term (1 day and 7 day) biocompatibility, biodegradability and MRI contrast capability were investigated in vivo on Wistar rats. The results showed excellent MRI contrast and minimal acute inflammation.
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Affiliation(s)
- Tamás Veres
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, 1089 Budapest, Hungary; (T.V.); (C.V.); (K.M.)
| | - Constantinos Voniatis
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, 1089 Budapest, Hungary; (T.V.); (C.V.); (K.M.)
- Department of Surgery, Transplantation and Gastroenterology, Semmelweis University, 1082 Budapest, Hungary
| | - Kristóf Molnár
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, 1089 Budapest, Hungary; (T.V.); (C.V.); (K.M.)
| | - Dániel Nesztor
- Department of Food Engineering, University of Szeged, 6725 Szeged, Hungary; (D.N.); (E.T.)
| | - Daniella Fehér
- Heart and Vascular Centre, Department of Surgical Research and Techniques, Semmelweis University, 1122 Budapest, Hungary; (D.F.); (A.F.)
| | - Andrea Ferencz
- Heart and Vascular Centre, Department of Surgical Research and Techniques, Semmelweis University, 1122 Budapest, Hungary; (D.F.); (A.F.)
| | - Iván Gresits
- Department of Biophysics and Radiation Biology, Semmelweis University, 1094 Budapest, Hungary; (I.G.); (I.H.); (D.M.); (K.S.)
| | - György Thuróczy
- NRIRR “Frédéric Joliot-Curie” National Research Institute for Radiobiology and Radiohygiene, 1221 Budapest, Hungary;
| | - Bence Gábor Márkus
- Stavropoulos Center for Complex Quantum Matter, Department of Physics and Astronomy, University of Notre Dame, Notre Dame, IN 46556, USA;
- Institute of Physics, Budapest University of Technology and Economics, 1521 Budapest, Hungary;
- Wigner Research Centre for Physics Economics, 1121 Budapest, Hungary
| | - Ferenc Simon
- Institute of Physics, Budapest University of Technology and Economics, 1521 Budapest, Hungary;
- Wigner Research Centre for Physics Economics, 1121 Budapest, Hungary
| | - Norbert Marcell Nemes
- Grupo de Física de Materiales Complejos (GFMC), Departamento de Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain; (N.M.N.); (M.G.-H.)
| | - Mar García-Hernández
- Grupo de Física de Materiales Complejos (GFMC), Departamento de Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain; (N.M.N.); (M.G.-H.)
| | - Lilla Reiniger
- Department of Pathology and Experimental Cancer Research, Semmelweis University, 1085 Budapest, Hungary;
| | - Ildikó Horváth
- Department of Biophysics and Radiation Biology, Semmelweis University, 1094 Budapest, Hungary; (I.G.); (I.H.); (D.M.); (K.S.)
| | - Domokos Máthé
- Department of Biophysics and Radiation Biology, Semmelweis University, 1094 Budapest, Hungary; (I.G.); (I.H.); (D.M.); (K.S.)
- Hungarian Center of Excellence for Molecular Medicine (HCEMM), In Vivo Imaging Advanced Core Facility, Semmelweis University Site, 1094 Budapest, Hungary
| | - Krisztián Szigeti
- Department of Biophysics and Radiation Biology, Semmelweis University, 1094 Budapest, Hungary; (I.G.); (I.H.); (D.M.); (K.S.)
| | - Etelka Tombácz
- Department of Food Engineering, University of Szeged, 6725 Szeged, Hungary; (D.N.); (E.T.)
- Soós Ernő Water Technology Research and Development Center, University of Pannonia, 8800 Nagykanizsa, Hungary
| | - Angela Jedlovszky-Hajdu
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, 1089 Budapest, Hungary; (T.V.); (C.V.); (K.M.)
- Correspondence:
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5
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Socoliuc V, Avdeev MV, Kuncser V, Turcu R, Tombácz E, Vékás L. Ferrofluids and bio-ferrofluids: looking back and stepping forward. Nanoscale 2022; 14:4786-4886. [PMID: 35297919 DOI: 10.1039/d1nr05841j] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ferrofluids investigated along for about five decades are ultrastable colloidal suspensions of magnetic nanoparticles, which manifest simultaneously fluid and magnetic properties. Their magnetically controllable and tunable feature proved to be from the beginning an extremely fertile ground for a wide range of engineering applications. More recently, biocompatible ferrofluids attracted huge interest and produced a considerable increase of the applicative potential in nanomedicine, biotechnology and environmental protection. This paper offers a brief overview of the most relevant early results and a comprehensive description of recent achievements in ferrofluid synthesis, advanced characterization, as well as the governing equations of ferrohydrodynamics, the most important interfacial phenomena and the flow properties. Finally, it provides an overview of recent advances in tunable and adaptive multifunctional materials derived from ferrofluids and a detailed presentation of the recent progress of applications in the field of sensors and actuators, ferrofluid-driven assembly and manipulation, droplet technology, including droplet generation and control, mechanical actuation, liquid computing and robotics.
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Affiliation(s)
- V Socoliuc
- Romanian Academy - Timisoara Branch, Center for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids, Mihai Viteazu Ave. 24, 300223 Timisoara, Romania.
| | - M V Avdeev
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie Str. 6, 141980 Dubna, Moscow Reg., Russia.
| | - V Kuncser
- National Institute of Materials Physics, Bucharest-Magurele, 077125, Romania
| | - Rodica Turcu
- National Institute for Research and Development of Isotopic and Molecular Technologies (INCDTIM), Donat Str. 67-103, 400293 Cluj-Napoca, Romania
| | - Etelka Tombácz
- University of Szeged, Faculty of Engineering, Department of Food Engineering, Moszkvai krt. 5-7, H-6725 Szeged, Hungary.
- University of Pannonia - Soós Ernő Water Technology Research and Development Center, H-8800 Zrínyi M. str. 18, Nagykanizsa, Hungary
| | - L Vékás
- Romanian Academy - Timisoara Branch, Center for Fundamental and Advanced Technical Research, Laboratory of Magnetic Fluids, Mihai Viteazu Ave. 24, 300223 Timisoara, Romania.
- Politehnica University of Timisoara, Research Center for Complex Fluids Systems Engineering, Mihai Viteazul Ave. 1, 300222 Timisoara, Romania
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Dzhardimalieva G, Bondarenko L, Illés E, Tombácz E, Tropskaya N, Magomedov I, Orekhov A, Kydralieva K. Colloidal Stability of Silica-Modified Magnetite Nanoparticles: Comparison of Various Dispersion Techniques. Nanomaterials (Basel) 2021; 11:nano11123295. [PMID: 34947643 DOI: 10.3390/nano11123295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/16/2021] [Accepted: 12/02/2021] [Indexed: 11/16/2022]
Abstract
The production of stable and homogeneous batches during nanoparticle fabrication is challenging. Surface charging, as a stability determinant, was estimated for 3-aminopropyltriethoxysilane (APTES) coated pre-formed magnetite nanoparticles (MNPs). An important consideration for preparing stable and homogenous MNPs colloidal systems is the dispersion stage of pre-formed samples, which makes it feasible to increase the MNP reactive binding sites, to enhance functionality. The results gave evidence that the samples that had undergone stirring had a higher loading capacity towards polyanions, in terms of filler content, compared to the sonicated ones. These later results were likely due to the harsh effects of sonication (extremely high temperature and pressure in the cavities formed at the interfaces), which induced the destruction of the MNPs.
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Affiliation(s)
- Gulzhian Dzhardimalieva
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
- Laboratory of Metal Polymers, Institute of Problems of Chemical Physics, 142432 Chernogolovka, Moscow Region, Russia
| | - Lyubov Bondarenko
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
| | - Erzsébet Illés
- Department of Food Engineering, University of Szeged, 6720 Szeged, Hungary
| | - Etelka Tombácz
- Soós Ernő Water Technology Research and Development Center, University of Pannonia, 8800 Nagykanizsa, Hungary
| | - Nataliya Tropskaya
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
- Sklifosovsky Institute for Emergency Medicine, 129090 Moscow, Russia
| | - Igor Magomedov
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
| | - Alexander Orekhov
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
| | - Kamila Kydralieva
- Department of General Engineering, Moscow Aviation Institute, National Research University, 125299 Moscow, Russia
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Rubia-Rodríguez I, Santana-Otero A, Spassov S, Tombácz E, Johansson C, De La Presa P, Teran FJ, Morales MDP, Veintemillas-Verdaguer S, Thanh NTK, Besenhard MO, Wilhelm C, Gazeau F, Harmer Q, Mayes E, Manshian BB, Soenen SJ, Gu Y, Millán Á, Efthimiadou EK, Gaudet J, Goodwill P, Mansfield J, Steinhoff U, Wells J, Wiekhorst F, Ortega D. Whither Magnetic Hyperthermia? A Tentative Roadmap. Materials (Basel) 2021; 14:706. [PMID: 33546176 PMCID: PMC7913249 DOI: 10.3390/ma14040706] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 01/20/2021] [Accepted: 01/25/2021] [Indexed: 12/11/2022]
Abstract
The scientific community has made great efforts in advancing magnetic hyperthermia for the last two decades after going through a sizeable research lapse from its establishment. All the progress made in various topics ranging from nanoparticle synthesis to biocompatibilization and in vivo testing have been seeking to push the forefront towards some new clinical trials. As many, they did not go at the expected pace. Today, fruitful international cooperation and the wisdom gain after a careful analysis of the lessons learned from seminal clinical trials allow us to have a future with better guarantees for a more definitive takeoff of this genuine nanotherapy against cancer. Deliberately giving prominence to a number of critical aspects, this opinion review offers a blend of state-of-the-art hints and glimpses into the future of the therapy, considering the expected evolution of science and technology behind magnetic hyperthermia.
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Affiliation(s)
| | | | - Simo Spassov
- Geophysical Centre of the Royal Meteorological Institute, 1 rue du Centre Physique, 5670 Dourbes, Belgium;
| | - Etelka Tombácz
- Soós Water Technology Research and Development Center, University of Pannonia, 8200 Nagykanizsa, Hungary;
| | - Christer Johansson
- RISE Research Institutes of Sweden, Sensors and Materials, Arvid Hedvalls Backe 4, 411 33 Göteborg, Sweden;
| | - Patricia De La Presa
- Instituto de Magnetismo Aplicado UCM-ADIF-CSIC, A6 22,500 km, 29260 Las Rozas, Spain;
- Departamento de Física de Materiales, Universidad Complutense de Madrid, Avda. Complutense s/n, 28048 Madrid, Spain
| | - Francisco J. Teran
- IMDEA Nanoscience, Faraday 9, 28049 Madrid, Spain; (I.R.-R.); (A.S.-O.); (F.J.T.)
- Nanotech Solutions, Ctra Madrid, 23, 40150 Villacastín, Spain
| | - María del Puerto Morales
- Department of Energy, Environment and Health, Instituto de Ciencia de Materiales de Madrid (ICMM/CSIC), Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain; (M.P.M.); (S.V.-V.)
| | - Sabino Veintemillas-Verdaguer
- Department of Energy, Environment and Health, Instituto de Ciencia de Materiales de Madrid (ICMM/CSIC), Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain; (M.P.M.); (S.V.-V.)
| | - Nguyen T. K. Thanh
- UCL Healthcare Biomagnetics and Nanomaterials Laboratories, 21 Albemarle Street, London W1S 4BS, UK;
- Biophysics Group, Department of Physics and Astronomy, Gower Street, London WC1E 6BT, UK
| | - Maximilian O. Besenhard
- Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;
| | - Claire Wilhelm
- Laboratoire Matière et Systèmes Complexes MSC, Université de Paris/CNRS, 75013 Paris, France; (C.W.); (F.G.)
| | - Florence Gazeau
- Laboratoire Matière et Systèmes Complexes MSC, Université de Paris/CNRS, 75013 Paris, France; (C.W.); (F.G.)
| | - Quentin Harmer
- Endomag, The Jeffreys Building, St John’s Innovation Park, Cowley Road, Cambridge CB4 0WS, UK; (Q.H.); (E.M.)
| | - Eric Mayes
- Endomag, The Jeffreys Building, St John’s Innovation Park, Cowley Road, Cambridge CB4 0WS, UK; (Q.H.); (E.M.)
| | - Bella B. Manshian
- Biomedical Sciences Group, Translational Cell and Tissue Research Unit, Department of Imaging and Pathology, 3000 Leuven, Belgium; (B.B.M.); (S.J.S.)
| | - Stefaan J. Soenen
- Biomedical Sciences Group, Translational Cell and Tissue Research Unit, Department of Imaging and Pathology, 3000 Leuven, Belgium; (B.B.M.); (S.J.S.)
| | - Yuanyu Gu
- INMA Instituto de Nanociencia de Materiales de Aragón, Pedro Cerbuna 12, 50009 Zaragoza, Spain; (Y.G.); (Á.M.)
| | - Ángel Millán
- INMA Instituto de Nanociencia de Materiales de Aragón, Pedro Cerbuna 12, 50009 Zaragoza, Spain; (Y.G.); (Á.M.)
| | - Eleni K. Efthimiadou
- Chemistry Department, Inorganic Chemistry Laboratory, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece;
| | - Jeff Gaudet
- Magnetic Insight, Alameda, CA 94501, USA; (J.G.); (P.G.); (J.M.)
| | - Patrick Goodwill
- Magnetic Insight, Alameda, CA 94501, USA; (J.G.); (P.G.); (J.M.)
| | - James Mansfield
- Magnetic Insight, Alameda, CA 94501, USA; (J.G.); (P.G.); (J.M.)
| | - Uwe Steinhoff
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany; (U.S.); (J.W.); (F.W.)
| | - James Wells
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany; (U.S.); (J.W.); (F.W.)
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany; (U.S.); (J.W.); (F.W.)
| | - Daniel Ortega
- IMDEA Nanoscience, Faraday 9, 28049 Madrid, Spain; (I.R.-R.); (A.S.-O.); (F.J.T.)
- Institute of Research and Innovation in Biomedical Sciences of the Province of Cádiz (INiBICA), 11002 Cádiz, Spain
- Condensed Matter Physics Department, Faculty of Sciences, Campus Universitario de Puerto Real s/n, 11510 Puerto Real, Spain
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Illés E, Tombácz E, Hegedűs Z, Szabó T. Tunable Magnetic Hyperthermia Properties of Pristine and Mildly Reduced Graphene Oxide/Magnetite Nanocomposite Dispersions. Nanomaterials (Basel) 2020; 10:nano10122426. [PMID: 33291627 PMCID: PMC7761925 DOI: 10.3390/nano10122426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 11/29/2020] [Accepted: 12/02/2020] [Indexed: 12/19/2022]
Abstract
We present a study on the magnetic hyperthermia properties of graphene oxide/magnetite (GO/MNP) nanocomposites to investigate their heat production behavior upon the modification of the oxidation degree of the carbonaceous host. Avoiding the harsh chemical conditions of the regular in situ co-precipitation-based routes, the oppositely charged MNPs and GO nanosheets were combined by the heterocoagulation process at pH ~ 5.5, which is a mild way to synthesize composite nanostructures at room temperature. Nanocomposites prepared at 1/5 and 1/10 GO/MNP mass ratios were reduced by NaBH4 and L-ascorbic acid (LAA) under acidic (pH ~ 3.5) and alkaline conditions (pH ~ 9.3). We demonstrate that the pH has a crucial effect on the LAA-assisted conversion of graphene oxide to reduced GO (rGO): alkaline reduction at higher GO loadings leads to doubled heat production of the composite. Spectrophotometry proved that neither the moderately acidic nor alkaline conditions promote the iron dissolution of the magnetic core. Although the treatment with NaBH4 also increased the hyperthermic efficiency of aqueous GO/MNP nanocomposite suspensions, it caused a drastic decline in their colloidal stability. However, considering the enhanced heat production and the slightly improved stability of the rGO/MNP samples, the reduction with LAA under alkaline condition is a more feasible way to improve the hyperthermic efficiency of magnetically modified graphene oxides.
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Affiliation(s)
- Erzsébet Illés
- Correspondence: (E.I.); (T.S.); Tel.: +36-62-544-112 (T.S.)
| | | | | | - Tamás Szabó
- Correspondence: (E.I.); (T.S.); Tel.: +36-62-544-112 (T.S.)
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9
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Krasia-Christoforou T, Socoliuc V, Knudsen KD, Tombácz E, Turcu R, Vékás L. From Single-Core Nanoparticles in Ferrofluids to Multi-Core Magnetic Nanocomposites: Assembly Strategies, Structure, and Magnetic Behavior. Nanomaterials (Basel) 2020; 10:E2178. [PMID: 33142887 PMCID: PMC7692798 DOI: 10.3390/nano10112178] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/19/2020] [Accepted: 10/20/2020] [Indexed: 12/20/2022]
Abstract
Iron oxide nanoparticles are the basic components of the most promising magnetoresponsive nanoparticle systems for medical (diagnosis and therapy) and bio-related applications. Multi-core iron oxide nanoparticles with a high magnetic moment and well-defined size, shape, and functional coating are designed to fulfill the specific requirements of various biomedical applications, such as contrast agents, heating mediators, drug targeting, or magnetic bioseparation. This review article summarizes recent results in manufacturing multi-core magnetic nanoparticle (MNP) systems emphasizing the synthesis procedures, starting from ferrofluids (with single-core MNPs) as primary materials in various assembly methods to obtain multi-core magnetic particles. The synthesis and functionalization will be followed by the results of advanced physicochemical, structural, and magnetic characterization of multi-core particles, as well as single- and multi-core particle size distribution, morphology, internal structure, agglomerate formation processes, and constant and variable field magnetic properties. The review provides a comprehensive insight into the controlled synthesis and advanced structural and magnetic characterization of multi-core magnetic composites envisaged for nanomedicine and biotechnology.
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Affiliation(s)
- Theodora Krasia-Christoforou
- Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Avenue, P.O. Box 20537, Nicosia 1678, Cyprus;
| | - Vlad Socoliuc
- Laboratory of Magnetic Fluids, Center for Fundamental and Advanced Technical Research, Romanian Academy–Timisoara Branch, Mihai Viteazul Ave. 24, 300223 Timisoara, Romania;
| | - Kenneth D. Knudsen
- Department for Neutron Materials Characterization, Institute for Energy Technology (IFE), 2027 Kjeller, Norway;
| | - Etelka Tombácz
- Soós Ernő Water Technology Research and Development Center, University of Pannonia, Zrínyi M. Str. 18., H-8800 Nagykanizsa, Hungary;
| | - Rodica Turcu
- Department of Physics of Nanostructured Systems, National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Str. 67-103, 400293 Cluj-Napoca, Romania
| | - Ladislau Vékás
- Laboratory of Magnetic Fluids, Center for Fundamental and Advanced Technical Research, Romanian Academy–Timisoara Branch, Mihai Viteazul Ave. 24, 300223 Timisoara, Romania;
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Bondarenko LS, Kovel ES, Kydralieva KA, Dzhardimalieva GI, Illés E, Tombácz E, Kicheeva AG, Kudryasheva NS. Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactions. Nanomaterials (Basel) 2020; 10:E1499. [PMID: 32751621 PMCID: PMC7466415 DOI: 10.3390/nano10081499] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/25/2020] [Accepted: 07/27/2020] [Indexed: 12/16/2022]
Abstract
Current paper presents biological effects of magnetite nanoparticles (MNPs). "Relations of MNP' characteristics (zeta-potential and hydrodynamic diameters) with effects on bacteria and their enzymatic reactions were the main focus.". Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.
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Affiliation(s)
- Lyubov S. Bondarenko
- Moscow Aviation Institute (National Research University), 125993 Moscow, Russia; (L.S.B.); (K.A.K.); (G.I.D.)
| | - Ekaterina S. Kovel
- Institute of Physics SB RAS, FRC KSC SB RAS, 660036 Krasnoyarsk, Russia
- Institute of Biophysics SB RAS, FRC KSC SB RAS, 660036 Krasnoyarsk, Russia;
| | - Kamila A. Kydralieva
- Moscow Aviation Institute (National Research University), 125993 Moscow, Russia; (L.S.B.); (K.A.K.); (G.I.D.)
| | - Gulzhian I. Dzhardimalieva
- Moscow Aviation Institute (National Research University), 125993 Moscow, Russia; (L.S.B.); (K.A.K.); (G.I.D.)
- Institute of Problems of Chemical Physics RAS, 142432 Chernogolovka, Moscow Region, Russia
| | - Erzsébet Illés
- University of Szeged, H-6720 Szeged, Hungary; (E.I.); (E.T.)
| | - Etelka Tombácz
- University of Szeged, H-6720 Szeged, Hungary; (E.I.); (E.T.)
| | | | - Nadezhda S. Kudryasheva
- Institute of Biophysics SB RAS, FRC KSC SB RAS, 660036 Krasnoyarsk, Russia;
- Siberian Federal University, 660041 Krasnoyarsk, Russia;
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11
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Tombácz E, Tóth IY, Kovács K, Illés E, Szekeres M, Barna B, Csicsor A, Szabó T. Striking analogies and dissimilarities between graphene oxides and humic acids: pH-dependent charging and colloidal stability. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112948] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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12
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Illés E, Szekeres M, Tóth IY, Farkas K, Földesi I, Szabó Á, Iván B, Tombácz E. PEGylation of Superparamagnetic Iron Oxide Nanoparticles with Self-Organizing Polyacrylate-PEG Brushes for Contrast Enhancement in MRI Diagnosis. Nanomaterials (Basel) 2018; 8:E776. [PMID: 30274317 PMCID: PMC6215243 DOI: 10.3390/nano8100776] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 09/24/2018] [Accepted: 09/27/2018] [Indexed: 11/19/2022]
Abstract
For biomedical applications, superparamagnetic nanoparticles (MNPs) have to be coated with a stealth layer that provides colloidal stability in biological media, long enough persistence and circulation times for reaching the expected medical aims, and anchor sites for further attachment of bioactive agents. One of such stealth molecules designed and synthesized by us, poly(polyethylene glycol methacrylate-co-acrylic acid) referred to as P(PEGMA-AA), was demonstrated to make MNPs reasonably resistant to cell internalization, and be an excellent candidate for magnetic hyperthermia treatments in addition to possessing the necessary colloidal stability under physiological conditions (Illés et al. J. Magn. Magn. Mater. 2018, 451, 710⁻720). In the present work, we elaborated on the molecular background of the formation of the P(PEGMA-AA)-coated MNPs, and of their remarkable colloidal stability and salt tolerance by using potentiometric acid⁻base titration, adsorption isotherm determination, infrared spectroscopy (FT-IR ATR), dynamic light scattering, and electrokinetic potential determination methods. The P(PEGMA-AA)@MNPs have excellent blood compatibility as demonstrated in blood sedimentation, smears, and white blood cell viability experiments. In addition, blood serum proteins formed a protein corona, protecting the particles against aggregation (found in dynamic light scattering and electrokinetic potential measurements). Our novel particles also proved to be promising candidates for MRI diagnosis, exhibiting one of the highest values of r2 relaxivity (451 mM-1s-1) found in literature.
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Affiliation(s)
- Erzsébet Illés
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Márta Szekeres
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Ildikó Y Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary.
| | - Katalin Farkas
- Department of Laboratory Medicine, University of Szeged, Semmelweis u. 6, H-6720 Szeged, Hungary.
| | - Imre Földesi
- Department of Laboratory Medicine, University of Szeged, Semmelweis u. 6, H-6720 Szeged, Hungary.
| | - Ákos Szabó
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, H-1519 Budapest, Hungary.
| | - Béla Iván
- Polymer Chemistry Research Group, Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, H-1519 Budapest, Hungary.
| | - Etelka Tombácz
- Department of Food Engineering, University of Szeged, Moszkvai krt. 5-7, H-6725 Szeged, Hungary.
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14
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Vasilescu C, Latikka M, Knudsen KD, Garamus VM, Socoliuc V, Turcu R, Tombácz E, Susan-Resiga D, Ras RHA, Vékás L. High concentration aqueous magnetic fluids: structure, colloidal stability, magnetic and flow properties. Soft Matter 2018; 14:6648-6666. [PMID: 30035279 DOI: 10.1039/c7sm02417g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This paper is an in-depth analysis devoted to two basic types of water based magnetic fluids (MFs), containing magnetite nanoparticles with electrostatic and with electro-steric stabilization, both obtained by chemical coprecipitation synthesis under atmospheric conditions. The two sets of magnetic fluid samples, one with citric acid (MF/CA) and the other with oleic acid (MF/OA) coated magnetic nanoparticles, respectively, achieved saturation magnetization values of 78.20 kA m-1 for the electrostatically and 48.73 kA m-1 for the electro-sterically stabilized aqueous ferrofluids which are among the highest reported to date. A comprehensive comparative analysis combining electron microscopy, X-ray photoelectron spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy, vibrating sample magnetometry, small-angle X-ray and neutron scattering, dynamic light scattering and magneto-rheometry revealed similarities and essential differences on the microscopic and macroscopic level between the two kinds of water-based ferrofluids. While the saturation magnetization values are quite different, the hydrodynamic volume fractions of the highest concentration MF/CA and MF/OA samples are practically the same, due to the significantly different thicknesses of the particles' coating layers. The results of volume fraction dependent structure analyses over a large concentration range by small-angle X-ray and neutron scattering, correlated with magneto-rheological investigations for the electrostatically stabilized MFs, demonstrate formation of short chains of magnetic nanoparticles which are relatively stable against coagulation with increasing concentration, while for MFs with electro-steric stabilization, magnetic field and shear rate dependent loosely bound structures are observed. These particle structures in MF/OA samples manifest themselves already at low volume fraction values, which can be attributed mainly to magnetic interactions of larger size particles, besides non-magnetic interactions mediated by excess surfactant.
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Affiliation(s)
- Corina Vasilescu
- Department of Applied Chemistry and Organic and Natural Compounds Engineering, Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Carol Telbisz 6, 300001 Timişoara, Romania
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15
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Máté Z, Horváth E, Papp A, Kovács K, Tombácz E, Nesztor D, Szabó T, Szabó A, Paulik E. Neurotoxic effects of subchronic intratracheal Mn nanoparticle exposure alone and in combination with other welding fume metals in rats. Inhal Toxicol 2017; 29:227-238. [PMID: 28722486 DOI: 10.1080/08958378.2017.1350218] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Manganese (Mn) is a toxic heavy metal exposing workers in various occupational settings and causing, among others, nervous system damage. Metal fumes of welding, a typical source of Mn exposure, contain a complex mixture of metal oxides partly in nanoparticle form. As toxic effects of complex substances cannot be sufficiently understood by examining its components separately, general toxicity and functional neurotoxicity of a main pathogenic welding fume metal, Mn, was examined alone and combined with iron (Fe) and chromium (Cr), also frequently found in fumes. Oxide nanoparticles of Mn, Mn + Fe, Mn + Cr and the triple combination were applied, in aqueous suspension, to the trachea of young adult Wistar rats for 4 weeks. The decrease of body weight gain during treatment, caused by Mn, was counteracted by Fe, but not Cr. At the end of treatment, spontaneous and evoked cortical electrical activity was recorded. Mn caused a shift to higher frequencies, and lengthened evoked potential latency, which were also strongly diminished by co-application of Fe only. The interaction of the metals seen in body weight gain and cortical activity were not related to the measured blood and brain metal levels. Fe might have initiated protective, e.g. antioxidant, mechanisms with a more general effect.
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Affiliation(s)
- Zsuzsanna Máté
- a Department of Public Health, Faculty of Medicine , University of Szeged , Szeged , Hungary
| | - Edina Horváth
- a Department of Public Health, Faculty of Medicine , University of Szeged , Szeged , Hungary
| | - András Papp
- a Department of Public Health, Faculty of Medicine , University of Szeged , Szeged , Hungary
| | - Krisztina Kovács
- b Department of Physical Chemistry and Materials Science, Faculty of Science and Informatics , University of Szeged , Szeged , Hungary
| | - Etelka Tombácz
- b Department of Physical Chemistry and Materials Science, Faculty of Science and Informatics , University of Szeged , Szeged , Hungary
| | - Dániel Nesztor
- b Department of Physical Chemistry and Materials Science, Faculty of Science and Informatics , University of Szeged , Szeged , Hungary
| | - Tamás Szabó
- b Department of Physical Chemistry and Materials Science, Faculty of Science and Informatics , University of Szeged , Szeged , Hungary
| | - Andrea Szabó
- a Department of Public Health, Faculty of Medicine , University of Szeged , Szeged , Hungary
| | - Edit Paulik
- a Department of Public Health, Faculty of Medicine , University of Szeged , Szeged , Hungary
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16
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Manek E, Tombácz E, Geissler E, László K. Search for the Origin of Discrepancies in Osmotic Measurements of the PNIPAM - Water System. ACTA ACUST UNITED AC 2017. [DOI: 10.3311/ppch.10273] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Major, still unelucidated, inconsistencies exist in the literature among measurements of the thermodynamic properties of poly(N-isopropylacrylamide) (PNIPAM) solutions and gels. This paper looks for evidence of intrinsic ionic behaviour in cross-linked PNIPAM homopolymer hydrogels synthesized in water under standard conditions. Systematic measurements are made of the swelling and osmotic properties of lightly cross-linked PNIPAM hydrogels, as well as of their potentiometric titration and DSC response, over a wide range of pH and ionic strength conditions, in order to distinguish the effects of the latter two parameters on putative intrinsic ions. The intrinsic ion content of the gel is found to be vanishingly small, and consequently unlikely to be the source of the divergences among past measurements. By contrast, a major finding of this study is that comparison of the present results with the literature reveals that frustrated equilibrium can be a source of substantial discrepancies.
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Tombácz E, Farkas K, Földesi I, Szekeres M, Illés E, Tóth IY, Nesztor D, Szabó T. Polyelectrolyte coating on superparamagnetic iron oxide nanoparticles as interface between magnetic core and biorelevant media. Interface Focus 2016; 6:20160068. [PMID: 27920900 DOI: 10.1098/rsfs.2016.0068] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Nanoparticles do not exist in thermodynamical equilibrium because of high surface free energy, thus they have only kinetic stability. Spontaneous changes can be delayed by designed surface coating. In biomedical applications, superparamagnetic iron oxide nanoparticles (SPIONs) require an optimized coating in order to fulfil the expectation of medicine regulatory agencies and ultimately that of biocompatibility. In this work, we show the high surface reactivity of naked SPIONs due to ≡Fe-OH sites, which can react with H+/OH- to form pH- and ionic strength-dependent charges. We explain the post-coating of naked SPIONs with organic polyacids via multi-site complex bonds formed spontaneously. The excess polyacids can be removed from the medium. The free COOH groups in coating are prone to react with active biomolecules like proteins. Charging and pH- and salt-dependent behaviour of carboxylated SPIONs were characterized quantitatively. The interrelation between the coating quality and colloidal stability measured under biorelevant conditions is discussed. Our coagulation kinetics results allow us to predict colloidal stability both on storage and in use; however, a simpler method would be required to test SPION preparations. Haemocompatibility tests (smears) support our qualification for good and bad SPION manufacturing; the latter 'promises' fatal outcome in vivo.
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Affiliation(s)
- Etelka Tombácz
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
| | - Katalin Farkas
- Department of Laboratory Medicine , University of Szeged , Semmelweis u. 6, 6720 Szeged , Hungary
| | - Imre Földesi
- Department of Laboratory Medicine , University of Szeged , Semmelweis u. 6, 6720 Szeged , Hungary
| | - Márta Szekeres
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
| | - Erzsébet Illés
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
| | - Ildikó Y Tóth
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
| | - Daniel Nesztor
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
| | - Tamás Szabó
- Department of Physical Chemistry and Materials Science , University of Szeged , Aradi vt 1, 6720 Szeged , Hungary
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18
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Friedrich RP, Zaloga J, Schreiber E, Tóth IY, Tombácz E, Lyer S, Alexiou C. Tissue Plasminogen Activator Binding to Superparamagnetic Iron Oxide Nanoparticle-Covalent Versus Adsorptive Approach. Nanoscale Res Lett 2016; 11:297. [PMID: 27299652 PMCID: PMC4907967 DOI: 10.1186/s11671-016-1521-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 06/07/2016] [Indexed: 05/03/2023]
Abstract
Functionalized superparamagnetic iron oxide nanoparticles are frequently used to develop vehicles for drug delivery, hyperthermia, and photodynamic therapy and as tools used for magnetic separation and purification of proteins or for biomolecular imaging. Depending on the application, there are various possible covalent and non-covalent approaches for the functionalization of particles, each of them shows different advantages and disadvantages for drug release and activity at the desired location.Particularly important for the production of adsorptive and covalent bound drugs to nanoparticles is the pureness of the involved formulation. Especially the covalent binding strategy demands defined chemistry of the drug, which is stabilized by excess free amino acids which could reduce reaction efficiency. In this study, we therefore used tangential flow filtration (TFF) method to purify the drugs before the reaction and used the frequently applied and clinically available recombinant tissue plasminogen activator (tPA; Actilyse(®)) as a proof of concept. We then coupled the tPA preparation to polyacrylic acid-co-maleic acid (PAM)-coated superparamagnetic iron oxide nanoparticles (SPIONs) using an amino-reactive activated ester reaction and compared these particles to PAM-coated SPIONs with electrostatically adsorbed tPA.Using dynamic light scattering (DLS) and pH-dependent electrokinetic mobility measurements, we showed that surface properties of the SPIONs were significantly greater affected after activation of the particles compared to the adsorption controls. Different in vitro assays were used to investigate the activity of tPA after coupling to the particles and purification of the ferrofluid. Covalent linkage significantly improves the reactivity and long-term stability of the conjugated SPION-tPA system compared to simple adsorption. In conclusion, we have shown an effective way to produce SPIONs with covalent and non-covalent ultra-filtrated drugs. We showed that using activated ester reaction, immobilization of the protein was significantly better than in adsorptive approaches. Investigation of those functionalized SPIONs revealed diverging attributes, which should be taken into account when developing nanoparticles for different applications.
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Affiliation(s)
- Ralf P Friedrich
- />Department of Otorhinolaryngology, Head and Neck, Section for Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Glueckstraße 10a, 91054 Erlangen, Germany
| | - Jan Zaloga
- />Department of Otorhinolaryngology, Head and Neck, Section for Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Glueckstraße 10a, 91054 Erlangen, Germany
| | - Eveline Schreiber
- />Department of Otorhinolaryngology, Head and Neck, Section for Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Glueckstraße 10a, 91054 Erlangen, Germany
| | - Ildikó Y Tóth
- />Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, Hungary
| | - Etelka Tombácz
- />Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, Hungary
| | - Stefan Lyer
- />Department of Otorhinolaryngology, Head and Neck, Section for Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Glueckstraße 10a, 91054 Erlangen, Germany
| | - Christoph Alexiou
- />Department of Otorhinolaryngology, Head and Neck, Section for Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Glueckstraße 10a, 91054 Erlangen, Germany
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Pusztai P, Haspel H, Tóth IY, Tombácz E, László K, Kukovecz Á, Kónya Z. Structure-Independent Proton Transport in Cerium(III) Phosphate Nanowires. ACS Appl Mater Interfaces 2015; 7:9947-56. [PMID: 25859883 DOI: 10.1021/acsami.5b02177] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Péter Pusztai
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., H-6720 Szeged, Hungary
| | - Henrik Haspel
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., H-6720 Szeged, Hungary
| | - Ildikó Y. Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vértanúk tere 1., H-6720 Szeged, Hungary
| | - Etelka Tombácz
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vértanúk tere 1., H-6720 Szeged, Hungary
| | - Krisztina László
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., H-6720 Szeged, Hungary
- MTA-SZTE “Lendület” Porous Nanocomposites
Research Group, Rerrich Béla
tér 1., H-6720 Szeged, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1., H-6720 Szeged, Hungary
- MTA-SZTE Reaction Kinetics and Surface
Chemistry Research Group, Rerrich Béla
tér 1., H-6720 Szeged, Hungary
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Tóth IY, Szekeres M, Turcu R, Sáringer S, Illés E, Nesztor D, Tombácz E. Mechanism of in situ surface polymerization of gallic acid in an environmental-inspired preparation of carboxylated core-shell magnetite nanoparticles. Langmuir 2014; 30:15451-15461. [PMID: 25517214 DOI: 10.1021/la5038102] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Magnetite nanoparticles (MNPs) with biocompatible coatings are good candidates for MRI (magnetic resonance imaging) contrasting, magnetic hyperthermia treatments, and drug delivery systems. The spontaneous surface induced polymerization of dissolved organic matter on environmental mineral particles inspired us to prepare carboxylated core-shell MNPs by using a ubiquitous polyphenolic precursor. Through the adsorption and in situ surface polymerization of gallic acid (GA), a polygallate (PGA) coating is formed on the nanoparticles (PGA@MNP) with possible antioxidant capacity. The present work explores the mechanism of polymerization with the help of potentiometric acid-base titration, dynamic light scattering (for particle size and zeta potential determination), UV-vis (UV-visible light spectroscopy), FTIR-ATR (Fourier-transformed infrared spectroscopy by attenuated total reflection), and XPS (X-ray photoelectron spectroscopy) techniques. We observed the formation of ester and ether linkages between gallate monomers both in solution and in the adsorbed state. Higher polymers were formed in the course of several weeks both on the surface of nanoparticles and in the dispersion medium. The ratio of the absorbances of PGA supernatants at 400 and 600 nm (i.e., the E4/E6 ratio commonly used to characterize the degree of polymerization of humic materials) was determined to be 4.3, similar to that of humic acids. Combined XPS, dynamic light scattering, and FTIR-ATR results revealed that, prior to polymerization, the GA monomers became oxidized to poly(carboxylic acid)s due to ring opening while Fe(3+) ions reduced to Fe(2+). Our published results on the colloidal and chemical stability of PGA@MNPs are referenced thoroughly in the present work. Detailed studies on biocompatibility, antioxidant property, and biomedical applicability of the particles will be published.
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Affiliation(s)
- Ildikó Y Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged , Aradi vt 1, 6720 Szeged, Hungary
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21
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Illés E, Szekeres M, Kupcsik E, Tóth IY, Farkas K, Jedlovszky-Hajdú A, Tombácz E. PEGylation of surfacted magnetite core–shell nanoparticles for biomedical application. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.01.043] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tombácz E, Szekeres M, Hajdú A, Tóth IY, Bauer RA, Nesztor D, Illés E, Zupkó I, Vékás L. Colloidal stability of carboxylated iron oxide nanomagnets for biomedical use. Period Polytech Chem Eng 2014. [DOI: 10.3311/ppch.7285] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Tombácz E, Tóth I, Nesztor D, Illés E, Hajdú A, Szekeres M, L.Vékás. Adsorption of organic acids on magnetite nanoparticles, pH-dependent colloidal stability and salt tolerance. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.01.023] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Szekeres M, Tóth IY, Illés E, Hajdú A, Zupkó I, Farkas K, Oszlánczi G, Tiszlavicz L, Tombácz E. Chemical and colloidal stability of carboxylated core-shell magnetite nanoparticles designed for biomedical applications. Int J Mol Sci 2013; 14:14550-74. [PMID: 23857054 PMCID: PMC3742259 DOI: 10.3390/ijms140714550] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 06/18/2013] [Accepted: 06/21/2013] [Indexed: 01/04/2023] Open
Abstract
Despite the large efforts to prepare super paramagnetic iron oxide nanoparticles (MNPs) for biomedical applications, the number of FDA or EMA approved formulations is few. It is not known commonly that the approved formulations in many instances have already been withdrawn or discontinued by the producers; at present, hardly any approved formulations are produced and marketed. Literature survey reveals that there is a lack for a commonly accepted physicochemical practice in designing and qualifying formulations before they enter in vitro and in vivo biological testing. Such a standard procedure would exclude inadequate formulations from clinical trials thus improving their outcome. Here we present a straightforward route to assess eligibility of carboxylated MNPs for biomedical tests applied for a series of our core-shell products, i.e., citric acid, gallic acid, poly(acrylic acid) and poly(acrylic acid-co-maleic acid) coated MNPs. The discussion is based on physicochemical studies (carboxylate adsorption/desorption, FTIR-ATR, iron dissolution, zeta potential, particle size, coagulation kinetics and magnetization measurements) and involves in vitro and in vivo tests. Our procedure can serve as an example to construct adequate physico-chemical selection strategies for preparation of other types of core-shell nanoparticles as well.
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Affiliation(s)
- Márta Szekeres
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary; E-Mails: (I.Y.T.); (E.I.)
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (E.T.); Tel.: +36-62-544-212 (M.S. & E.T.); Fax: +36-62-546-482 (M.S.)
| | - Ildikó Y. Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary; E-Mails: (I.Y.T.); (E.I.)
| | - Erzsébet Illés
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary; E-Mails: (I.Y.T.); (E.I.)
| | - Angéla Hajdú
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, H-1089 Budapest, Nagyvárad tér 4, Hungary; E-Mail:
| | - István Zupkó
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 1, H-6720 Szeged, Hungary; E-Mail:
| | - Katalin Farkas
- Department of Laboratory Medicine, University of Szeged, Semmelweis u. 6, H-6720 Szeged, Hungary; E-Mail:
| | - Gábor Oszlánczi
- Department of Public Health, University of Szeged, Dóm tér 10, H-6720 Szeged, Hungary; E-Mail:
| | - László Tiszlavicz
- Department of Pathology, University of Szeged, Állomás u. 2, H-6720 Szeged, Hungary; E-Mail:
| | - Etelka Tombácz
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary; E-Mails: (I.Y.T.); (E.I.)
- Authors to whom correspondence should be addressed; E-Mails: (M.S.); (E.T.); Tel.: +36-62-544-212 (M.S. & E.T.); Fax: +36-62-546-482 (M.S.)
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Tóth IY, Illés E, Bauer RA, Nesztor D, Szekeres M, Zupkó I, Tombácz E. Designed polyelectrolyte shell on magnetite nanocore for dilution-resistant biocompatible magnetic fluids. Langmuir 2012; 28:16638-46. [PMID: 23140279 DOI: 10.1021/la302660p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Magnetite nanoparticles (MNPs) coated with poly(acrylic acid-co-maleic acid) polyelectrolyte (PAM) have been prepared with the aim of improving colloidal stability of core-shell nanoparticles for biomedical applications and enhancing the durability of the coating shells. FTIR-ATR measurements reveal two types of interaction of PAM with MNPs: hydrogen bonding and inner-sphere metal-carboxylate complex formation. The mechanism of the latter is ligand exchange between uncharged -OH groups of the surface and -COO(-) anionic moieties of the polyelectrolyte as revealed by adsorption and electrokinetic experiments. The aqueous dispersion of PAM@MNP particles (magnetic fluids - MFs) tolerates physiological salt concentration at composition corresponding to the plateau of the high-affinity adsorption isotherm. The plateau is reached at small amount of added PAM and at low concentration of nonadsorbed PAM, making PAM highly efficient for coating MNPs. The adsorbed PAM layer is not desorbed during dilution. The performance of the PAM shell is superior to that of poly(acrylic acid) (PAA), often used in biocompatible MFs. This is explained by the different adsorption mechanisms; metal-carboxylate cannot form in the case of PAA. Molecular-level understanding of the protective shell formation on MNPs presented here improves fundamentally the colloidal techniques used in core-shell nanoparticle production for nanotechnology applications.
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Affiliation(s)
- Ildikó Y Tóth
- Department of Physical Chemistry and Materials Science, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary
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Tóth A, Törőcsik A, Tombácz E, László K. Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs. J Colloid Interface Sci 2012; 387:244-9. [DOI: 10.1016/j.jcis.2012.07.064] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 07/20/2012] [Accepted: 07/23/2012] [Indexed: 11/29/2022]
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Jedlovszky-Hajdú A, Bombelli FB, Monopoli MP, Tombácz E, Dawson KA. Surface coatings shape the protein corona of SPIONs with relevance to their application in vivo. Langmuir 2012; 28:14983-14991. [PMID: 23002920 DOI: 10.1021/la302446h] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) have proved their use in many biomedical applications, such as drug delivery, hyperthermia, and MRI (magnetic resonance imaging) contrast agents. Due to their instability in fluids, several surface coatings have been used to both stabilize and tune the properties of these nanoparticles (NPs) according to their applications. These coatings will strongly modify their surface properties and influence their interaction with the environment proteins in a relevant biological medium with a clear impact on their function. It is well-accepted that a protein corona is immediately formed when nanoparticles come in contact with a biological milieu, and the emergent bionano interface represents the biological identity of the particles. Here, we investigate how a different coating on the same magnetic core can influence the protein corona composition and structure with clear relevance to application of these NPs in medicine. In particular, we have studied the structure and composition of the protein corona-SPION complexes of magnetite nanoparticles stabilized with citric acid, poly(acrylic acid), or double layer oleic acid by a range of approaches, including dynamic light scattering, nanoparticle tracking analysis, differential centrifugal sedimentation, infrared spectroscopy, 1-D SDS gel electrophoresis, and mass spectroscopy.
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Affiliation(s)
- Angéla Jedlovszky-Hajdú
- Laboratory of Nanochemistry, Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary.
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Hajdú A, Szekeres M, Tóth IY, Bauer RA, Mihály J, Zupkó I, Tombácz E. Enhanced stability of polyacrylate-coated magnetite nanoparticles in biorelevant media. Colloids Surf B Biointerfaces 2012; 94:242-9. [DOI: 10.1016/j.colsurfb.2012.01.042] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 01/23/2012] [Accepted: 01/27/2012] [Indexed: 10/14/2022]
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Whitby RLD, Gun'ko VM, Korobeinyk A, Busquets R, Cundy AB, László K, Skubiszewska-Zięba J, Leboda R, Tombácz E, Toth IY, Kovacs K, Mikhalovsky SV. Driving forces of conformational changes in single-layer graphene oxide. ACS Nano 2012; 6:3967-73. [PMID: 22494387 PMCID: PMC3357922 DOI: 10.1021/nn3002278] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 04/11/2012] [Indexed: 05/20/2023]
Abstract
The extensive oxygen-group functionality of single-layer graphene oxide proffers useful anchor sites for chemical functionalization in the controlled formation of graphene architecture and composites. However, the physicochemical environment of graphene oxide and its single-atom thickness facilitate its ability to undergo conformational changes due to responses to its environment, whether pH, salinity, or temperature. Here, we report experimental and molecular simulations confirming the conformational changes of single-layer graphene oxide sheets from the wet or dry state. MD, PM6, and ab initio simulations of dry SLG and dry and wetted SLGO and electron microscopy imaging show marked differences in the properties of the materials that can explain variations in previously observed results for the pH dependent behavior of SLGO and electrical conductivity of chemically modified graphene-polymer composites. Understanding the physicochemical responses of graphene and graphene oxide architecture and performing selected chemistry will ultimately facilitate greater tunability of their performance.
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Affiliation(s)
- Raymond L D Whitby
- Nanoscience & Nanotechnology Group, Faculty of Science and Engineering, University of Brighton, Lewes Road, Brighton, BN2 4GJ, United Kingdom.
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Papp I, Balázs M, Tombácz E, Babcsán N, Kesserű P, Kiss I, Szvetnik A. PCR-DGGE analysis of the bacterial composition of a kaolin slurry showing altered rheology. World J Microbiol Biotechnol 2011; 28:1843-8. [DOI: 10.1007/s11274-011-0976-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2011] [Accepted: 12/06/2011] [Indexed: 11/29/2022]
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Vékás L, Tombácz E, Turcu R, Morjan I, Avdeev M, Krasia-Chrisoforou T, Socoliuc V. Synthesis of Magnetic Nanoparticles and Magnetic Fluids for Biomedical Applications. Else Kröner-Fresenius Symposia 2011. [DOI: 10.1159/000328882] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Kovács K, Gáspár A, Sajgó C, Schmitt-Kopplin P, Tombácz E. Comparison of humic substances isolated from thermal water and surface water by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Eur J Mass Spectrom (Chichester) 2010; 16:625-630. [PMID: 20814082 DOI: 10.1255/ejms.1087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Characterization of humic substances isolated from thermal water and surface water was carried out by elemental analysis and electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. Atomic ratios derived from elemental analysis represented compositional differences of humic substances. Hydrogen-to-carbon and oxygen-to-carbon atomic ratios were also calculated from molecular formulae determined by ultra high-resolution mass spectrometry. The van Krevelen diagram was used to illustrate the bias between the atomic ratios from elemental analysis and mass spectrometry.
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Tombácz E, Hajdú A, Illés E, László K, Garberoglio G, Jedlovszky P. Water in contact with magnetite nanoparticles, as seen from experiments and computer simulations. Langmuir 2009; 25:13007-14. [PMID: 19702278 DOI: 10.1021/la901875f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The adsorption of water vapor at the surface of magnetite nanoparticles has been investigated both by experimental and by computer simulation methods. The water vapor adsorption/desorption isotherm has been measured on freshly prepared magnetite nanocrystals of the size below 10 nm. The change of the isosteric heat of adsorption with the surface coverage has been determined from the temperature dependence of this isotherm using the isosteric method. The adsorption isotherm has also been determined by performing a set of grand canonical Monte Carlo simulations at 300 K. X-ray photoelectron spectroscopy results as well as the temperature and coverage dependence of the isosteric heat of adsorption clearly indicates that dissociative chemisorption of the water molecules in the first adsorption layer occurs at the bare magnetite surface, resulting in a high density of surface hydroxyl groups. This dissociative chemisorption is followed by a multilayer physisorption of water at higher pressures. Computer simulation results can reproduce excellently both the adsorption isotherm and the isosteric heat of adsorption beyond the first chemisorbed layer of water. Results of the computer simulations reveal that physisorbed water forms several well-distinguished molecular layers on the magnetite surface; however, these layers are not built up sequentially. Instead, the building up of several molecular layers occurs simultaneously. The adsorption of the water molecules in this range appears to be a nucleation-like process, resulting in a rather rough external surface of the adsorption layer.
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Affiliation(s)
- Etelka Tombácz
- Department of Colloid Chemistry, University of Szeged, H-6720 Szeged, Hungary.
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Hajdú A, Illés E, Tombácz E, Borbáth I. Surface charging, polyanionic coating and colloid stability of magnetite nanoparticles. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.12.039] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Tombácz E, Bica D, Hajdú A, Illés E, Majzik A, Vékás L. Surfactant double layer stabilized magnetic nanofluids for biomedical application. J Phys Condens Matter 2008; 20:204103. [PMID: 21694233 DOI: 10.1088/0953-8984/20/20/204103] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetite nanoparticles were coated with surfactant double layers in order to prepare water based magnetic fluids (MFs). The effects of head group (sulfonate, carboxylate) and alkyl chain length (11-17 C atoms) and the combination of surfactants were studied. Adsorption, dynamic light scattering (DLS) and electrophoretic mobility measurements were performed. The quantity of surfactant varied between 0.3 and 0.5 g, i.e. their specific amount ranges over 1.5-2 mmol g(-1) magnetite in MFs. The adsorption isotherm of Na oleate on magnetite proved the double layer formation with 2 mmol g(-1) saturation value in good harmony with the empirical doses. The effect of diluting MFs, pH and salt concentration was studied. The pH-dependent stability and the salt tolerance of MFs were different owing to the dissociation of the outermost hydrophilic groups and the hydrophobic interactions scaling with the alkyl chain length of surfactant. The hydrophobic interactions are favored only for oleic and myristic acid double layers. In these MFs, aggregation cannot be observed even in fairly dilute systems up to the physiological salt concentration around neutral pH 6-8 favored in biomedical application. The stable oleic and myristic acid double layers can hinder effectively the aggregation of magnetite particles due to the combined steric and electrostatic stabilization.
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Affiliation(s)
- E Tombácz
- Department of Colloid Chemistry, University of Szeged, Hungary
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Sipos P, Berkesi O, Tombácz E, Katona H, Madácsi R. [The nature of interactions between iron(III) and the structure of the Fe(III)-chitosan "complex"]. Acta Pharm Hung 2007; 77:165-175. [PMID: 18019781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The interactions between the cationic polymer chitosan (a copolymer, consisting mainly of 2-amino-2-deoxy-D-glucopyranose and, to a lesser extent, of 2-acetamido-2-deoxy-D-glucopyranose, Chit) and iron(III) were investigated. The solution properties were studied by pH-metry, UV-Vis spectrophotometry and viscometry. Solid state iron(III)-Chit samples were also prepared and characterized by IR-spectroscopy and electronmicroscopy. In aqueous solutions, the precipitation pH of the FeO(OH) is significantly shifted towards the higher pH-s in presence of Chit. However, the additivity of the pH-metric titration curves, the lack of variation both in tin presence and absence of iron(III), indicate that there is no specific coordination chemical interaction between the Chit and ferric ions. It is well established that spherical FeO(OH) particles with afew nm diameter, morphologically similar to the core of the iron(III)-storage protein ferritin, are formed during the hydrolysis of iron(III) even in the absence of complexing agents. Such isolated FeO(OH) spheres were observed in samples obtained from solutions containing iron(III) and Chit. The fact, that visible precipitation of FeO(OH) can only be observed, when the Chit itself precipitates from aqueous solutions (i.e., pH approximately 7), indicates that the role of Chit in these systems is to inhibit the aggregation of the subcolloidal FeO(OH) particles. These observations are in strong contrast with those obtained for interactions between iron(III) and various anionic biopolymers, such as heparin, hyaluronate, dextran sulfate and chondroitin sulphate A and C, and suggest that coordination chemical interactions play very important role in determining the nanostructure of composite materials containing iron(III) and polysaccharides.
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Affiliation(s)
- Pál Sipos
- Szegedi Tudományegyetem, Szervetlen es Analitikai Kémiai Tanszék Pf. 440, H-6701, Szeged.
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Illés E, Tombácz E. The effect of humic acid adsorption on pH-dependent surface charging and aggregation of magnetite nanoparticles. J Colloid Interface Sci 2006; 295:115-23. [PMID: 16139290 DOI: 10.1016/j.jcis.2005.08.003] [Citation(s) in RCA: 418] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2005] [Revised: 07/30/2005] [Accepted: 08/01/2005] [Indexed: 11/16/2022]
Abstract
The pH-dependent adsorption of humic acid (HA) on magnetite and its effect on the surface charging and the aggregation of oxide particles were investigated. HA was extracted from brown coal. Synthetic magnetite was prepared by alkaline hydrolysis of iron(II) and iron(III) salts. The pH-dependent particle charge and aggregation, and coagulation kinetics at pH approximately 4 were measured by laser Doppler electrophoresis and dynamic light scattering. The charge of pure magnetite reverses from positive to negative at pH approximately 8, which may consider as isoelectric point (IEP). Near this pH, large aggregates form, while stable sols exist further from it. In the presence of increasing HA loading, the IEP shifts to lower pH, then at higher loading, magnetite becomes negatively charged even at low pHs, which indicate the neutralization and gradual recharging positive charges on surface. In acidic region, the trace HA amounts are adsorbed on magnetite surface as oppositely charged patches, systems become highly unstable due to heterocoagulation. Above the adsorption saturation, however, the nanoparticles are stabilized in a way of combined steric and electrostatic effects. The HA coated magnetite particles form stable colloidal dispersion, particle aggregation does not occur in a wide range of pH and salt tolerance is enhanced.
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Affiliation(s)
- E Illés
- Department of Colloid Chemistry, University of Szeged, Aradi Vt. 1, H-6720 Szeged, Hungary
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Illés E, Tombácz E. The role of variable surface charge and surface complexation in the adsorption of humic acid on magnetite. Colloids Surf A Physicochem Eng Asp 2003. [DOI: 10.1016/j.colsurfa.2003.09.017] [Citation(s) in RCA: 170] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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László K, Tombácz E, Kerepesi P. Surface chemistry of nanoporous carbon and the effect of pH on adsorption from aqueous phenol and 2,3,4-trichlorophenol solutions. Colloids Surf A Physicochem Eng Asp 2003. [DOI: 10.1016/j.colsurfa.2003.09.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Khalaf M, Kohl SD, Klumpp E, Rice JA, Tombácz E. Comparison of sorption domains in molecular weight fractions of a soil humic acid using solid-state 19F NMR. Environ Sci Technol 2003; 37:2855-2860. [PMID: 12875386 DOI: 10.1021/es0206386] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Humic acid was fractionated into eight different molecular size components using ultrafiltration. Solid-state CPMAS 13C NMR demonstrated that fractions larger than 100,000 Daltons were primarily aliphatic in character, while fractions smaller than 30,000 Daltons were predominantly aromatic in character. Solid-state 19F NMR examination of the sorptive uptake of hexafluorobenzene (HFB) by HA and each of the fractions gave spectroscopic evidence for the existence of at least three sorption sites in the smaller molecular size fractions, while two predominant sorption sites could be established in the larger molecular size fractions. Sorbed HFB displayed higher mobility in the smaller, more aromatic fractions while HFB in the larger, more aliphatic fractions displayed lower mobility. The relative mobilities of HFB in each sorption domain suggest that the rigid domain may be composed of aliphatic carbon rather than aromatic carbon moieties. In larger size fractions, this domain may be the result of rigid, glassy regions composed of aliphatic molecules or side chains.
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Affiliation(s)
- M Khalaf
- Institute of Chemistry and Dynamics of the Geosphere IV, Agrosphere, Research Center Jülich, D-52428 Jülich, Germany
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Sipos P, Berkesi O, Tombácz E, St Pierre TG, Webb J. Formation of spherical iron(III) oxyhydroxide nanoparticles sterically stabilized by chitosan in aqueous solutions. J Inorg Biochem 2003; 95:55-63. [PMID: 12706542 DOI: 10.1016/s0162-0134(03)00068-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interactions between the cationic polymer chitosan (Chit) and iron(III) were investigated. The solution properties were studied by pH-metry, viscometry and dynamic light scattering. Solid state iron(III)-Chit samples were also prepared and characterized by IR spectroscopy and electron microscopy. In aqueous solutions, the precipitation pH of the iron(III) oxyhydroxide (FeOOH) is significantly shifted towards the higher pH values in the presence of Chit indicating that some interaction takes place between the iron(III) and the polymer. However, the additivity of the pH-metric titration curves, the lack of variation both in the viscometric and IR spectra of Chit in the presence and absence of iron(III), indicate the lack of direct complexation between the Chit and ferric ions. Isolated FeOOH nanospheres of 5-10 nm diameter were observed on the transmission electron microscopic pictures of samples obtained from solutions containing iron(III) and Chit, while from DLS measurements hydrodynamic units with a few hundred nm in diameter were identified. Our data support that Chit acts as steric stabilizer and inhibits the macroscopic aggregation of the subcolloidal FeOOH particles. Thus the iron(III)-Chit interactions offer a simple and economic way to fabricate nanometric size FeOOH spheres, morphologically similar to the core of iron(III)-storage protein, ferritin.
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Affiliation(s)
- Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, Hungary.
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Ren SZ, Tombácz E, Rice JA. Dynamic light scattering from power-law polydisperse fractals: Application of dynamic scaling to humic acid. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1996; 53:2980-2983. [PMID: 9964591 DOI: 10.1103/physreve.53.2980] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Kotov N, Putyera K, Fendler J, Tombácz E, Dékány I. Cadmium sulfide particles in organomontmorillonite complexes. Colloids Surf A Physicochem Eng Asp 1993. [DOI: 10.1016/0927-7757(93)80047-i] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tombácz E, Deér I, Dékány I. Compression study on hydrophobic layered silicates dispersed in organic liquid mixtures. Colloids Surf A Physicochem Eng Asp 1993. [DOI: 10.1016/0927-7757(93)80041-c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Szalay L, Tombácz E, Várkonyi Z, Faludi-Dániel Á. Detergent effects on an albumin-chlorophyll complex model of photosynthetic protein-pigment complexes. ACTA ACUST UNITED AC 1982. [DOI: 10.1007/bf03156192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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