1
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Saladino GM, Kakadiya R, Ansari SR, Teleki A, Toprak MS. Magnetoresponsive fluorescent core-shell nanoclusters for biomedical applications. NANOSCALE ADVANCES 2023; 5:1323-1330. [PMID: 36866251 PMCID: PMC9972542 DOI: 10.1039/d2na00887d] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Accepted: 01/30/2023] [Indexed: 06/18/2023]
Abstract
Nowadays, superparamagnetic iron oxide nanoparticles (SPIONs) have a dominant role in many subfields of biomedicine. Owing to their peculiar properties, they can be employed for magnetic separation, drug delivery, diagnostics, and hyperthermia treatments. However, these magnetic nanoparticles (NPs) suffer from low unit magnetization due to size constraints (up to 20-30 nm) to exhibit superparamagnetic character. In this work, we have designed and synthesized superparamagnetic nanoclusters (SP-NCs) with diameters of up to 400 nm with high unit magnetization for enhanced loading capacity. These were synthesized with conventional or microwave-assisted solvothermal methods, in the presence of either of the two biomolecules (citrate or l-lysine) as the capping agent. Primary particle size, SP-NC size, surface chemistry, and the resultant magnetic properties were observed to be significantly influenced by the choice of synthesis route and capping agent. Selected SP-NCs were then coated with a fluorophore-doped silica shell to provide fluorescence properties, in the near-infrared spectrum region, while silica provided high chemical and colloidal stability. Heating efficiency studies were performed under alternating magnetic field on the synthesized SP-NCs, highlighting their potential in hyperthermia treatment. We envision that their enhanced magnetically-active content, fluorescence, magnetic property, and heating efficiency will pave the way to more effective uses in biomedical applications.
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Affiliation(s)
- Giovanni Marco Saladino
- Department of Applied Physics, Biomedical and X-ray Physics, KTH Royal Institute of Technology SE 10691 Stockholm Sweden
| | - Ronak Kakadiya
- Department of Applied Physics, Biomedical and X-ray Physics, KTH Royal Institute of Technology SE 10691 Stockholm Sweden
| | - Shaquib Rahman Ansari
- Department of Pharmacy, Science for Life Laboratory, Uppsala University SE 75123 Uppsala Sweden
| | - Alexandra Teleki
- Department of Pharmacy, Science for Life Laboratory, Uppsala University SE 75123 Uppsala Sweden
| | - Muhammet Sadaka Toprak
- Department of Applied Physics, Biomedical and X-ray Physics, KTH Royal Institute of Technology SE 10691 Stockholm Sweden
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2
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Direct continuous synthesis of macroRAFT-grafted Fe3O4 nanoclusters for the preparation of magnetic nanocomposites. POWDER TECHNOL 2023. [DOI: 10.1016/j.powtec.2023.118364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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3
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Towards Polymeric Nanoparticles with Multiple Magnetic Patches. NANOMATERIALS 2021; 11:nano11010147. [PMID: 33435290 PMCID: PMC7827819 DOI: 10.3390/nano11010147] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/05/2021] [Accepted: 01/06/2021] [Indexed: 01/29/2023]
Abstract
Fabricating future materials by self-assembly of nano-building blocks programmed to generate specific lattices is among the most challenging goals of nanotechnology and has led to the recent concept of patchy particles. We report here a simple strategy to fabricate polystyrene nanoparticles with several silica patches based on the solvent-induced self-assembly of silica/polystyrene monopods. The latter are obtained with morphological yields as high as 99% by seed-growth emulsion polymerization of styrene in the presence of 100 nm silica seeds previously modified with an optimal surface density of methacryloxymethyl groups. In addition, we fabricate "magnetic" silica seeds by silica encapsulation of preformed maghemite supraparticles. The polystyrene pod, i.e., surface nodule, serves as a sticky point when the monopods are incubated in a bad/good solvent mixture for polystyrene, e.g., ethanol/tetrahydrofuran mixtures. After self-assembly, mixtures of particles with two, three, four silica or magnetic silica patches are mainly obtained. The influence of experimental parameters such as the ethanol/tetrahydrofuran volume ratio, monopod concentration and incubation time is studied. Further developments would consist of obtaining pure batches by centrifugal sorting and optimizing the relative position of the patches in conventional repulsion figures.
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4
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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, SWITZERLAND) 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] [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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5
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Guimarães TR, Lansalot M, Bourgeat-Lami E. Polymer-encapsulation of iron oxide clusters using macroRAFT block copolymers as stabilizers: tuning of the particle morphology and surface functionalization. J Mater Chem B 2020; 8:4917-4929. [PMID: 32343297 DOI: 10.1039/d0tb00384k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We report the successful synthesis of superparamagnetic latex particles with a high fraction of magnetic materials and a fast magnetic response. Commercial fatty acid-modified iron oxide (IO) nanoparticles were first assembled into spherical clusters through an emulsification/solvent evaporation method. The resulting particles were stabilized with poly(2-dimethylaminoethyl methacrylate)-b-polystyrene (PDMAEMA-b-PS) amphiphilic block copolymers obtained by RAFT, and used as seeds in the emulsion copolymerization of styrene and divinylbenzene (DVB), used as cross-linking agent. The latter revealed to be key in preserving the integrity of the clusters during the emulsion polymerization reaction, and a minimum amount (i.e. 10 wt%) was necessary to obtain stable latexes composed of a core of densely packed IO nanoparticles surrounded by a thin polymer shell. DVB also had a strong influence on the particle morphology as the core-shell morphology of the composite particles could be tuned with either a smooth polymer shell or a raspberry-like surface by adjusting the DVB-to-monomer weight ratio and the feeding conditions. The amphiphilic macroRAFT not only provides colloidal stability to the magnetic latexes, but also offers a versatile platform for the design of composite particles with tailored surface properties by an appropriate choice of the hydrophilic block. Our strategy was thus successfully extended to poly(acrylic acid)-b-polystyrene (PAA-b-PS) copolymers, leading to PAA-stabilized composite particles. Both kinds of IO-encapsulated particles showed superparamagnetic properties (magnetizations at saturation of 35 and 31 emu g-1 for PDMAEMA and PAA systems, respectively), and could thus find interesting applications as magnetic carriers in the biological field due to their thermo- (for PDMAEMA) and pH- (for PDMAEMA and PAA) responsive properties.
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Affiliation(s)
- Thiago Rodrigues Guimarães
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43, Bd. du 11 Novembre 1918, F-69616 Villeurbanne, France.
| | - Muriel Lansalot
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43, Bd. du 11 Novembre 1918, F-69616 Villeurbanne, France.
| | - Elodie Bourgeat-Lami
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes (C2P2), 43, Bd. du 11 Novembre 1918, F-69616 Villeurbanne, France.
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6
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Guimarães TR, Lansalot M, Bourgeat-Lami E. Synthesis of double-responsive magnetic latex particles via seeded emulsion polymerization using macroRAFT block copolymers as stabilizers. Polym Chem 2020. [DOI: 10.1039/c9py01627a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We report the synthesis of magnetic latex particles decorated with double-responsive PDMAEMA segments with fast magnetic response via RAFT-assisted emulsion polymerization, highlighting this strategy as a powerful tool for magnetic carriers design.
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Affiliation(s)
| | - Muriel Lansalot
- Univ Lyon
- Université Claude Bernard Lyon 1
- CPE Lyon
- CNRS
- UMR 5265
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7
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Delafresnaye L, Dugas PY, Lansalot M, Bourgeat-Lami E. Innovative Method for Laponite Encapsulation into Polymer Latex Particles by Clay Cluster-Seeded Emulsion Polymerization. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b02190] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laura Delafresnaye
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers & Processes (C2P2), 43 Bvd. du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Pierre-Yves Dugas
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers & Processes (C2P2), 43 Bvd. du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Muriel Lansalot
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers & Processes (C2P2), 43 Bvd. du 11 Novembre 1918, 69616 Villeurbanne, France
| | - Elodie Bourgeat-Lami
- Univ Lyon, Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers & Processes (C2P2), 43 Bvd. du 11 Novembre 1918, 69616 Villeurbanne, France
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8
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Li Y, Wang N, Huang X, Li F, Davis TP, Qiao R, Ling D. Polymer-Assisted Magnetic Nanoparticle Assemblies for Biomedical Applications. ACS APPLIED BIO MATERIALS 2019; 3:121-142. [DOI: 10.1021/acsabm.9b00896] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yuhuan Li
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | | | - Xumin Huang
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | | | - Thomas P. Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ruirui Qiao
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
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9
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Mandriota G, Di Corato R, Benedetti M, De Castro F, Fanizzi FP, Rinaldi R. Design and Application of Cisplatin-Loaded Magnetic Nanoparticle Clusters for Smart Chemotherapy. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1864-1875. [PMID: 30580523 DOI: 10.1021/acsami.8b18717] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
One of the major challenges of drug delivery is the development of suitable carriers for therapeutic molecules. In this work, a novel nanoformulation based on superparamagnetic nanoclusters [magnetic nanocrystal clusters (MNCs)] is presented. In order to control the size of the nanoclusters and the density of magnetic cores, several parameters were evaluated and tuned. Then, MNCs were functionalized with a polydopamine layer (MNC@PDO) to improve their stability in aqueous solution, to increase density of functional groups and to obtain a nanosystem suitable for drug-controlled release. Finally, cisplatin was grafted on the surface of MNC@PDO to exploit the system as a magnetic field-guided anticancer delivery system. The biocompatibility of MNC@PDO and the cytotoxic effects of MNC@PDO-cisplatin complex were determined against human cervical cancer (HeLa) and human breast adenocarcinoma (MCF-7) cells. In vitro studies demonstrated that the MNC@PDO-cisplatin complexes inhibited the cellular proliferation by a dose-dependent effect. Therefore, by applying an external magnetic field, the released drug exerted its effect on a specific target area. In summary, the MNC@PDO nanosystem has a great potential to be used in targeted nanomedicine for the delivery of other drugs or biofunctional molecules.
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Affiliation(s)
- Giacomo Mandriota
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
| | - Riccardo Di Corato
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
- Center for Biomolecular Nanotechnologies (CBN) , Istituto Italiano di Tecnologia (IIT) , Via Barsanti , Arnesano, 73010 Lecce , Italy
| | - Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Federica De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Francesco P Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Rosaria Rinaldi
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
- Scuola Superiore ISUFI , University of Salento , Via Monteroni, University Campus , 73100 Lecce , Italy
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10
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Jaiswal KK, Manikandan D, Murugan R, Ramaswamy AP. Microwave-assisted rapid synthesis of Fe3O4/poly(styrene-divinylbenzene-acrylic acid) polymeric magnetic composites and investigation of their structural and magnetic properties. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.11.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Shikha S, Salafi T, Cheng J, Zhang Y. Versatile design and synthesis of nano-barcodes. Chem Soc Rev 2017; 46:7054-7093. [DOI: 10.1039/c7cs00271h] [Citation(s) in RCA: 120] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
This review provides a critical discussion on the versatile designing and usage of nano-barcodes for various existing and emerging applications.
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Affiliation(s)
- Swati Shikha
- Department of Biomedical Engineering
- Faculty of Engineering
- National University of Singapore (NUS)
- 117583 Singapore
| | - Thoriq Salafi
- Department of Biomedical Engineering
- Faculty of Engineering
- National University of Singapore (NUS)
- 117583 Singapore
- NUS Graduate School for Integrative Sciences and Engineering
| | - Jinting Cheng
- Institute of Materials Research and Engineering (IMRE)
- Agency for Science
- Technology and Research (A*STAR)
- Singapore
| | - Yong Zhang
- Department of Biomedical Engineering
- Faculty of Engineering
- National University of Singapore (NUS)
- 117583 Singapore
- NUS Graduate School for Integrative Sciences and Engineering
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12
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Silica encapsulation by miniemulsion polymerization: A novel approach of efficient chemical functionalization on silica nanoparticles. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.06.033] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Sarigiannis Y, Kolokithas-Ntoukas Α, Beziere N, Zbořil R, Papadimitriou E, Avgoustakis K, Lamprou M, Medrikova Z, Rousalis E, Ntziachristos V, Bakandritsos A. Synthesis and evaluation of condensed magnetic nanocrystal clusters with in vivo multispectral optoacoustic tomography for tumour targeting. Biomaterials 2016; 91:128-139. [DOI: 10.1016/j.biomaterials.2016.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 02/11/2016] [Accepted: 03/08/2016] [Indexed: 01/21/2023]
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14
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Ulbrich K, Holá K, Šubr V, Bakandritsos A, Tuček J, Zbořil R. Targeted Drug Delivery with Polymers and Magnetic Nanoparticles: Covalent and Noncovalent Approaches, Release Control, and Clinical Studies. Chem Rev 2016; 116:5338-431. [DOI: 10.1021/acs.chemrev.5b00589] [Citation(s) in RCA: 1120] [Impact Index Per Article: 140.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Karel Ulbrich
- Institute
of Macromolecular Chemistry, The Czech Academy of Sciences, v.v.i., Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Kateřina Holá
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University, 17 Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Vladimir Šubr
- Institute
of Macromolecular Chemistry, The Czech Academy of Sciences, v.v.i., Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Aristides Bakandritsos
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University, 17 Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Jiří Tuček
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University, 17 Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Radek Zbořil
- Regional
Centre of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University, 17 Listopadu 1192/12, 771 46 Olomouc, Czech Republic
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15
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Li J, Zhang Y, Ai J, Gao Q, Qi H, Zhang C, Cheng Z. Quantum dot cluster (QDC)-loaded phospholipid micelles as a FRET probe for phospholipase A 2 detection. RSC Adv 2016; 6:15895-15899. [PMID: 26998254 PMCID: PMC4792299 DOI: 10.1039/c5ra25292j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
A simple assay for phospholipase A2 (PLA2) enzyme was developed based on a fluorescence resonance energy transfer (FRET) probe using the quantum dot cluster (QDC)-loaded phospholipid micelles. The probe was prepared by encapsulating many small hydrophobic quantum dots (QDs) within the hydrophobic core of micelles that were formed from the coassembly of hydrogenated soy phosphatidylcholine phospholipids (HSPC) and fluorescent lipids (NBD-PC). QDCs formed within the micelle core served as the substrate for NBD fluorescence quenching through FRET. The QDC-loaded micelles showed very low background fluorescence. As the PLA2 enzyme selectively digested lipids, the NBD fluorescence was recovered from its quenched state, leading to the sensitive detection of PLA2. This assay provided a limit of detection (at a signal-to-noise ratio of 3) of 3 U/L for PLA2. In the presence of a PLA2 inhibitor, the fluorescent response of the sensor for PLA2 decreased, indicating that the assay could also be used for screening the PLA2 inhibitors.
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Affiliation(s)
- Junling Li
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Yonghua Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Junjie Ai
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Qiang Gao
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Honglan Qi
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Chengxiao Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
| | - Zhiliang Cheng
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA
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16
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Tang Y, Liu Y, Li W, Xie Y, Li Y, Wu J, Wang S, Tian Y, Tian W, Teng Z, Lu G. Synthesis of sub-100 nm biocompatible superparamagnetic Fe3O4 colloidal nanocrystal clusters as contrast agents for magnetic resonance imaging. RSC Adv 2016. [DOI: 10.1039/c6ra09344b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Sub-100 nm Fe3O4 particles have been synthesized via a solvothermal method by using water as a size-control agent. They show superparamagnetism, high magnetization, prominent biocompatibility, and great promising for magnetic resonance imaging.
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17
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Magnetic iron oxide nanoparticles: Recent trends in design and synthesis of magnetoresponsive nanosystems. Biochem Biophys Res Commun 2015; 468:442-53. [DOI: 10.1016/j.bbrc.2015.08.030] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 08/08/2015] [Indexed: 01/01/2023]
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18
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Smith CE, Ernenwein D, Shkumatov A, Clay NE, Lee J, Melhem M, Misra S, Zimmerman SC, Kong H. Hydrophilic packaging of iron oxide nanoclusters for highly sensitive imaging. Biomaterials 2015; 69:184-90. [PMID: 26291408 PMCID: PMC4556553 DOI: 10.1016/j.biomaterials.2015.07.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 07/27/2015] [Accepted: 07/31/2015] [Indexed: 11/29/2022]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) are used as imaging probes to provide contrast in magnetic resonance images. Successful use of SPIONs in targeted applications greatly depends on their ability to generate contrast, even at low levels of accumulation, in the tissue of interest. In the present study, we report that SPION nanoclusters packaged to a controlled size by a hyperbranched polyglycerol (HPG) can target tissue defects and have a high relaxivity of 719 mM(-1) s(-1), which was close to their theoretical maximal limit. The resulting nanoclusters were able to identify regions of defective vasculature in an ischemic murine hindlimb using MRI with iron doses that were 5-10 fold lower than those typically used in preclinical studies. Such high relaxivity was attributed to the molecular architecture of HPG, which mimics that of the water retentive polysaccharide, glycogen. The results of this study will be broadly useful in sensitive imaging applications.
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Affiliation(s)
- Cartney E Smith
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Dawn Ernenwein
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Artem Shkumatov
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 South Lincoln Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA
| | - Nicholas E Clay
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - JuYeon Lee
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Molly Melhem
- Department of Bioengineering, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA
| | - Sanjay Misra
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
| | - Steven C Zimmerman
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Hyunjoon Kong
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA.
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19
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Wu M, Zhang D, Zeng Y, Wu L, Liu X, Liu J. Nanocluster of superparamagnetic iron oxide nanoparticles coated with poly (dopamine) for magnetic field-targeting, highly sensitive MRI and photothermal cancer therapy. NANOTECHNOLOGY 2015; 26:115102. [PMID: 25721867 DOI: 10.1088/0957-4484/26/11/115102] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this paper, a core–shell nanocomposite of clusters of superparamagnetic iron oxide nanoparticles coated with poly(dopamine) (SPION clusters@PDA) is fabricated as a magnetic field-directed theranostic agent that combines the capabilities of highly sensitive magnetic resonance imaging (MRI) and photothermal cancer therapy. The highly concentrated SPION cluster core is suitable for sensitive MRI due to its superparamagnetic properties, and the poly(dopamine) coating layer can induce cancer cell death under near-infrared (NIR) laser irradiation because of the photothermal conversion ability of PDA. MRI scanning reveals that the nanocomposite has relatively high r2 and r2(*) relaxivities, and the r2(*) values are nearly threefold higher than the r2 values because of the clustering of the SPIONs in the nanocomposite core. Due to the rapid response to magnetic field gradients, enhanced cellular uptake of our nanocomposite mediated by an external magnetic field can be achieved, thus producing significantly enhanced local photothermal killing efficiency against cancer cells under NIR irritation.
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20
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Lombardo MT, Pozzo LD. Clusters and inverse emulsions from nanoparticle surfactants in organic solvents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1344-1352. [PMID: 25584773 DOI: 10.1021/la504520p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A method is presented for the synthesis of self-assembling nanoparticle surfactants in nonpolar organic solvents. The method relies on the control of long-range steric repulsion imparted by grafted polystyrene and short-range attraction from short-chain thiol molecules with an alcohol or carboxylic functionality. Similar to water-based nanoparticle surfactants, these oil-dispersed materials are found to cluster in dispersion and also to stabilize oil-water interfaces to form water-in-oil emulsions. The clustering process is characterized with dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), UV-vis spectroscopy, and transmission electron microscopy (TEM). Thermogravimetric analysis (TGA) is used to quantify the surface concentration of grafted polymer, which is found to be a parameter of critical importance for the formation of stable clusters. The clustering kinetics and dispersion stability are both affected by the polymer molecular weight, surface concentration, and chemical structure of the thiol molecules that induce particle attraction. Nanometer-sized water-in-oil emulsions are formed by sonication in the presence of nanoparticle surfactants. A large broadening of the optical absorption spectrum in the NIR region is observed because of changes in the collective surface plasmon resonance of the gold particle shell.
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Affiliation(s)
- Michael T Lombardo
- Chemical Engineering Department, University of Washington , Seattle, Washington 98195, United States
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21
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Qiao XG, Dugas PY, Charleux B, Lansalot M, Bourgeat-Lami E. Synthesis of Multipod-like Silica/Polymer Latex Particles via Nitroxide-Mediated Polymerization-Induced Self-Assembly of Amphiphilic Block Copolymers. Macromolecules 2015. [DOI: 10.1021/ma5019473] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- X. G. Qiao
- Univ. Lyon
1, CPE Lyon, CNRS,
UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés
(C2P2), LCPP group, Université de Lyon, 43, Bd. du 11 Novembre
1918, F-69616 Villeurbanne, France
| | - P.-Y. Dugas
- Univ. Lyon
1, CPE Lyon, CNRS,
UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés
(C2P2), LCPP group, Université de Lyon, 43, Bd. du 11 Novembre
1918, F-69616 Villeurbanne, France
| | - B. Charleux
- Univ. Lyon
1, CPE Lyon, CNRS,
UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés
(C2P2), LCPP group, Université de Lyon, 43, Bd. du 11 Novembre
1918, F-69616 Villeurbanne, France
| | - M. Lansalot
- Univ. Lyon
1, CPE Lyon, CNRS,
UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés
(C2P2), LCPP group, Université de Lyon, 43, Bd. du 11 Novembre
1918, F-69616 Villeurbanne, France
| | - E. Bourgeat-Lami
- Univ. Lyon
1, CPE Lyon, CNRS,
UMR 5265, Laboratoire de Chimie, Catalyse, Polymères et Procédés
(C2P2), LCPP group, Université de Lyon, 43, Bd. du 11 Novembre
1918, F-69616 Villeurbanne, France
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22
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Chou IC, Chen SI, Chiu WY. Surfactant-free dispersion polymerization as an efficient synthesis route to a successful encapsulation of nanoparticles. RSC Adv 2014. [DOI: 10.1039/c4ra07475k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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23
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Bonnaud C, Monnier CA, Demurtas D, Jud C, Vanhecke D, Montet X, Hovius R, Lattuada M, Rothen-Rutishauser B, Petri-Fink A. Insertion of nanoparticle clusters into vesicle bilayers. ACS NANO 2014; 8:3451-3460. [PMID: 24611878 DOI: 10.1021/nn406349z] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A major contemporary concern in developing effective liposome-nanoparticle hybrids is the present inclusion size limitation of nanoparticles between vesicle bilayers, which is considered to be around 6.5 nm in diameter. In this article, we present experimental observations backed by theoretical considerations which show that greater structures can be incorporated within vesicle membranes by promoting the clustering of nanoparticles before liposome formation. Cryo-transmission electron microscopy and cryo-electron tomography confirm these observations at unprecedented detail and underpin that the liposome membranes can accommodate flexible structures of up to 60 nm in size. These results imply that this material is more versatile in terms of inclusion capabilities and consequently widens the opportunities in developing multivalent vesicles for nanobiotechnology applications.
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Affiliation(s)
- Cécile Bonnaud
- Adolphe Merkle Institute, University of Fribourg , Route de l'Ancienne Papéterie CP209, 1723 Marly 1, Switzerland
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24
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Li Y, Yuan D, Dong M, Chai Z, Fu G. Facile and green synthesis of core-shell structured magnetic chitosan submicrospheres and their surface functionalization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11770-11778. [PMID: 23968226 DOI: 10.1021/la402281e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Submicrometer-sized magnetite colloid nanocrystal clusters (MCNCs) provide a new avenue for constructing uniformly sized and highly magnetic composite submicrospheres. Herein, a facile and eco-friendly method is described for the synthesis of Fe3O4@poly(acrylic acid) (PAA)/chitosan (CS) core-shell submicrospheres using MCNCs bearing carboxyl groups as the magnetic cores. It is based on the self-assembly of positively charged CS chains on the surface of the oppositely charged MCNCs dispersed in the aqueous solution containing acrylic acid (AA) and a cross-linker N,N'-methylenebis(acrylamide) (MBA), followed by radical induced cross-linking copolymerization of AA and MBA along the CS chains. The resulting polymer shell comprises a medium shell of cross-linked PAA/CS polyelectrolyte complexes and an outer shell of protonated CS chains. It was found that the shell thickness could be tuned by varying either the concentration of radical initiator or the molar ratio of AA to aminoglucoside units of CS. To the surface of thus obtained Fe3O4@PAA/CS particles, Au nanoparticles, a variety of functional groups such as fluorescein, carboxyl, quaternary ammonium, and aliphatic bromide, and even functional polymer chains were successfully introduced. Therefore, such Fe3O4@PAA/CS submicrospheres may be used as versatile magnetic functional scaffolds in biorelated areas like bioseparation and medical assay, considering the unique features of CS like nontoxicity and biocompatibility.
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Affiliation(s)
- Yiya Li
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, Nankai University , Tianjin 300071, China
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25
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Bolisetty S, Vallooran JJ, Adamcik J, Mezzenga R. Magnetic-responsive hybrids of Fe3O4 nanoparticles with β-lactoglobulin amyloid fibrils and nanoclusters. ACS NANO 2013; 7:6146-6155. [PMID: 23750744 DOI: 10.1021/nn401988m] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report on the synthesis and magnetic-responsive behavior of hybrids formed by dispersing negatively charged iron oxide (Fe3O4) magnetic nanoparticles in positively charged β-lactoglobulin protein solutions at acidic pH, followed by heating at high temperatures. Depending on the pH used, different hybrid aggregates can be obtained, such as nanoparticle-modified amyloid fibrils (pH 3) and spherical nanoclusters (pH 4.5). We investigate the effect of magnetic fields of varying strengths (0-5 T) on the alignment of these Fe3O4-modified amyloid fibrils and spherical nanoclusters using a combination of scattering, birefringence and microscopic techniques and we find a strong alignment of the hybrids upon increasing the intensity of the magnetic field, which we quantify via 2D and 3D order parameters. We also demonstrate the possibility of controlling magnetically the sol-gel behavior of these hybrids: addition of salt (NaCl, 150 mM) to a solution containing nanoparticles modified with β-lactoglobulin amyloid fibrils (2 wt % fibrils modified with 0.6 wt % Fe3O4 nanoparticles) induces first the formation of a reversible gel, which can then be converted back to solution upon application of a moderate magnetic field of 1.1 T. These hybrids offer a new appealing functional colloidal system in which the aggregation, orientational order and rheological behavior can be efficiently controlled in a purely noninvasive way by external magnetic fields of weak intensity.
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Affiliation(s)
- Sreenath Bolisetty
- Department of Health Science and Technology, Food and Soft Materials Laboratory, ETH Zurich, Schmelzbergstrasse 9, LFO-E22, CH-8092 Zurich, Switzerland
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26
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Li Y, Dong M, Kong J, Chai Z, Fu G. Synthesis of Fe3O4@poly(methacrylic acid) core–shell submicrospheres via RAFT precipitation polymerization. J Colloid Interface Sci 2013; 394:199-207. [DOI: 10.1016/j.jcis.2012.12.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Revised: 12/05/2012] [Accepted: 12/05/2012] [Indexed: 11/30/2022]
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27
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Huang Y, Liu M, Chen J, Gao C, Gong Q. A novel magnetic triple-responsive composite semi-IPN hydrogels for targeted and controlled drug delivery. Eur Polym J 2012. [DOI: 10.1016/j.eurpolymj.2012.06.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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28
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Lu Z, Yin Y. Colloidal nanoparticle clusters: functional materials by design. Chem Soc Rev 2012; 41:6874-87. [PMID: 22868949 DOI: 10.1039/c2cs35197h] [Citation(s) in RCA: 223] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Significant advances in colloidal synthesis made in the past two decades have enabled the preparation of high quality nanoparticles with well-controlled sizes, shapes, and compositions. It has recently been realized that such nanoparticles can be utilized as 'artificial atoms' for building new materials which not only combine the size- and shape-dependent properties of individual nanoparticles but also create new collective properties by taking advantage of their electromagnetic interactions. The controlled clustering of nanoparticle building blocks into defined geometric arrangements opens a new research area in materials science and as a result much interest has been paid to the creation of secondary structures of nanoparticles, either by direct solution growth or self-assembly methods. In this tutorial review, we introduce recently developed strategies for the creation and surface modification of colloidal nanoparticle clusters, demonstrate the new collective properties resulting from their secondary structures, and highlight several of their many important technological applications ranging from photonics, separation, and detection, to multimodal imaging, energy storage and transformation, and catalysis.
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Affiliation(s)
- Zhenda Lu
- Department of Chemistry, University of California, Riverside CA 92521, USA
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29
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Shields MJ, Hahn KR, Janzen TW, Goji N, Thomas MC, Kingombe CBI, Paquet C, Kell AJ, Amoako KK. Immunomagnetic capture of Bacillus anthracis spores from food. J Food Prot 2012; 75:1243-8. [PMID: 22980007 DOI: 10.4315/0362-028x.jfp-12-048] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Food is a vulnerable target for potential bioterrorist attacks; therefore, a critical mitigation strategy is needed for the rapid concentration and detection of biothreat agents from food matrices. Magnetic beads offer a unique advantage in that they have a large surface area for efficient capture of bacteria. We have demonstrated the efficient capture and concentration of Bacillus anthracis (Sterne) spores using immunomagnetic beads for a potential food application. Magnetic beads from three different sources, with varying sizes and surface chemistries, were functionalized with monoclonal antibodies and polyclonal antibodies from commercial sources and used to capture and concentrate anthrax spores from spiked food matrices, including milk, apple juice, bagged salad, processed meat, and bottled water. The results indicated that the Pathatrix beads were more effective in the binding and capture of anthrax spores than the other two bead types investigated. Furthermore, it was observed that the use of polyclonal antibodies resulted in a more efficient recovery of anthrax spores than the use of monoclonal antibodies. Three different magnetic capture methods, inversion, the Pathatrix Auto system, and the new i CropTheBug system, were investigated. The i CropTheBug system yielded a much higher recovery of spores than the Pathatrix Auto system. Spore recoveries ranged from 80 to 100% for the i CropTheBug system when using pure spore preparations, whereas the Pathatrix Auto system had recoveries from 20 to 30%. Spore capture from food samples inoculated at a level of 1 CFU/ml resulted in 80 to 100% capture for milk, bottled water, and juice samples and 60 to 80% for processed meat and bagged salad when using the i CropTheBug system. This efficient capture of anthrax spores at very low concentrations without enrichment has the potential to enhance the sensitivity of downstream detection technologies and will be a useful method in a foodborne bioterrorism response.
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Affiliation(s)
- Michael J Shields
- Canadian Food Inspection Agency, National Centres for Animal Disease, Lethbridge Laboratory, P.O. Box 640, Township Road 9-1, Lethbridge, Alberta, Canada T1J 3Z4
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30
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Facile method for synthesis of hollow porous magnetic microspheres with controllable structure. J Colloid Interface Sci 2012; 375:70-7. [DOI: 10.1016/j.jcis.2012.02.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/02/2012] [Accepted: 02/11/2012] [Indexed: 11/23/2022]
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31
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Kloust H, Pöselt E, Kappen S, Schmidtke C, Kornowski A, Pauer W, Moritz HU, Weller H. Ultrasmall biocompatible nanocomposites: a new approach using seeded emulsion polymerization for the encapsulation of nanocrystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7276-7281. [PMID: 22497455 DOI: 10.1021/la300231r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report a novel approach of seeded emulsion polymerization in which nanocrystals are used as seeds. Ultrasmall biocompatible polymer-coated nanocrystal with sizes between 15 and 110 nm could be prepared in a process that avoids any treatment with high shear forces or ultrasonication. The number of nanocrystals per seed, the size of the seeds, and the shell thickness can be independently adjusted. Single encapsulated nanocrystals in ultrasmall nanobeads as well as clusters of nanocrystals can be obtained. Polysorbat-80 was used as surfactant. It consists of poly(ethylene glycol) (PEG) chains, giving the particles outstanding biofunctional characteristics such as a minimization of unspecific interactions.
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Affiliation(s)
- Hauke Kloust
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
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Paquet C, Ryan S, Zou S, Kell A, Tanha J, Hulse J, Tay LL, Simard B. Multifunctional nanoprobes for pathogen-selective capture and detection. Chem Commun (Camb) 2011; 48:561-3. [PMID: 22068209 DOI: 10.1039/c1cc16245d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of magnetic and fluorescent particles is described. The particles are biofunctionalized by binding pathogen-specific proteins to the particles via interactions between His-tags of proteins and zinc of the quantum dots. Detection of Salmonella and Staphylococcus aureus (S. aureus) by these particles is demonstrated.
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Affiliation(s)
- Chantal Paquet
- Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Ontario, Canada K1A 0R6.
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de Haan HW, Paquet C. Enhancement and degradation of the R
2* relaxation rate resulting from the encapsulation of magnetic particles with hydrophilic coatings. Magn Reson Med 2011; 66:1759-66. [DOI: 10.1002/mrm.22944] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 01/28/2011] [Accepted: 03/07/2011] [Indexed: 01/21/2023]
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34
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Paquet C, de Haan HW, Leek DM, Lin HY, Xiang B, Tian G, Kell A, Simard B. Clusters of superparamagnetic iron oxide nanoparticles encapsulated in a hydrogel: a particle architecture generating a synergistic enhancement of the T2 relaxation. ACS NANO 2011; 5:3104-12. [PMID: 21428441 DOI: 10.1021/nn2002272] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Clusters of iron oxide nanoparticles encapsulated in a pH-responsive hydrogel are synthesized and studied for their ability to alter the T(2)-relaxivity of protons. Encapsulation of the clusters with the hydrophilic coating is shown to enhance the transverse relaxation rate by up to 85% compared to clusters with no coating. With the use of pH-sensitive hydrogel, difficulties inherent in comparing particle samples are eliminated and a clear increase in relaxivity as the coating swells is demonstrated. Agreement with Monte Carlo simulations indicates that the lower diffusivity of water inside the coating and near the particle surface leads to the enhancement. This demonstration of a surface-active particle structure opens new possibilities in using similar structures for nanoparticle-based diagnostics using magnetic resonance imaging.
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Affiliation(s)
- Chantal Paquet
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, Ontario, Canada, K1A 0R6.
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35
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Mu B, Wang T, Wu Z, Shi H, Xue D, Liu P. Fabrication of functional block copolymer grafted superparamagnetic nanoparticles for targeted and controlled drug delivery. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.11.081] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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