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      Magnetic Particles for Advanced Molecular Diagnosis

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          Abstract

          Molecular diagnosis is the field that aims to develop nucleic-acid-based analytical methods for biological markers and gene expression assessments by combining laboratory medicine and molecular genetics. As it gradually becomes a clinical reality, molecular diagnosis could benefit from improvements resulting from thorough studies that could enhance the accuracy of these methods. The application of magnetic particles in molecular diagnosis tools has led to tremendous breakthroughs in terms of specificity, sensitivity, and discrimination in bioassays. Therefore, the aim of this review is to highlight the principles involved in the implementation of magnetic particles for sample preparation and targeted analyte isolation, purification, and extraction. Furthermore, the most recent advancements in the area of cancer and infectious disease diagnosis are presented, with an emphasis on screening and early stage detection.

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          Most cited references122

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          Magnetic Nanoparticles: From Design and Synthesis to Real World Applications

          The increasing number of scientific publications focusing on magnetic materials indicates growing interest in the broader scientific community. Substantial progress was made in the synthesis of magnetic materials of desired size, morphology, chemical composition, and surface chemistry. Physical and chemical stability of magnetic materials is acquired by the coating. Moreover, surface layers of polymers, silica, biomolecules, etc. can be designed to obtain affinity to target molecules. The combination of the ability to respond to the external magnetic field and the rich possibilities of coatings makes magnetic materials universal tool for magnetic separations of small molecules, biomolecules and cells. In the biomedical field, magnetic particles and magnetic composites are utilized as the drug carriers, as contrast agents for magnetic resonance imaging (MRI), and in magnetic hyperthermia. However, the multifunctional magnetic particles enabling the diagnosis and therapy at the same time are emerging. The presented review article summarizes the findings regarding the design and synthesis of magnetic materials focused on biomedical applications. We highlight the utilization of magnetic materials in separation/preconcentration of various molecules and cells, and their use in diagnosis and therapy.
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            Magnetic Mesoporous Silica Nanoparticles Cloaked by Red Blood Cell Membranes: Applications in Cancer Therapy

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              Magnetic Particle Imaging: A Novel in Vivo Imaging Platform for Cancer Detection

              Cancer remains one of the leading causes of death worldwide. Biomedical imaging plays a crucial role in all phases of cancer management. Physicians often need to choose the ideal diagnostic imaging modality for each clinical presentation based on complex trade-offs between spatial resolution, sensitivity, contrast, access, cost, and safety. Magnetic particle imaging (MPI) is an emerging tracer imaging modality that detects superparamagnetic iron oxide (SPIO) nanoparticle tracer with high image contrast (zero tissue background signal), high sensitivity (200 nM Fe) with linear quantitation and zero signal depth attenuation. MPI is also safe in that it uses safe, in some cases even clinically approved tracers and no ionizing radiation. The superb contrast, sensitivity, safety, and ability to image anywhere in the body lends MPI great promise for cancer imaging. In this study, we show for the first time the use of MPI for in vivo cancer imaging with systemic tracer administration. Here, long circulating MPI-tailored SPIOs were created and administered intravenously in tumor bearing rats. The tumor was highlighted with tumor-to-background ratio of up to 50. The nanoparticle dynamics in the tumor was also well appreciated, with initial wash-in on the tumor rim, peak uptake at 6 hours, and eventual clearance beyond 48 hours. Lastly, we demonstrate the quantitative nature of MPI through compartmental fitting in vivo .
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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                05 July 2019
                July 2019
                : 12
                : 13
                : 2158
                Affiliations
                [1 ]Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania
                [2 ]Microbiology Immunology Department, Faculty of Biology, University of Bucharest, 050095 Bucharest, Romania
                Author notes
                [* ]Correspondence: grumezescu@ 123456yahoo.com or alexandru.grumezescu@ 123456upb.ro ; Tel.: +40-21-402-39-97
                Author information
                https://orcid.org/0000-0002-8695-6884
                https://orcid.org/0000-0003-3036-094X
                Article
                materials-12-02158
                10.3390/ma12132158
                6651565
                31284393
                0c2e8eea-8eb9-4bd3-ba6e-547f19ec90e0
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 11 June 2019
                : 03 July 2019
                Categories
                Review

                molecular diagnostics,gene expression,biological markers,molecular genetics,cancer,infectious disease,magnetic particles

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