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He J, Hou Y, Wu W, Li Y, Tang F. Development of a broad-spectrum one-step immunoassay for detection of glucocorticoids in milk using magnetosome-based immunomagnetic beads. Food Chem 2024; 441:138377. [PMID: 38219367 DOI: 10.1016/j.foodchem.2024.138377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/27/2023] [Accepted: 01/04/2024] [Indexed: 01/16/2024]
Abstract
Immunomagnetic beads provide novel tools for high-throughput immunoassay techniques. In this study, protein G (PG) was immobilized onto bacterial magentic particles (BMPs) using an additional cysteine residue at the C-terminus. A broad-spectrum monoclonal antibody against glucocorticoids (GCs) was attached to BMPs through PG-Fc interaction, generating BMP-PG-mIgG immunomagentic beads. A sensitive one-step immunoassay was developed for GCs based on combination of BMP-PG-mIgG and dexamethasone-horseradish peroxidase tracer (DMS-HRP). The developed assay exhibited half inhibitory concentrations (IC50) for dexamethasone (DMS), betamethasone (BMS), prednisolone (PNS), hydrocortisone (HCS), beclomethasone (BCMS), cortisone (CS), 6-α-methylprednisone (6-α-MPNS), fludrocortisone acetate (HFCS) of 0.98, 1.49, 2.42, 9.29, 1.63, 6.13, 7.3, and 4.89 ng/mL, respectively. The method showed recoveries ranging rates from 86.5 % to 117 % with a coefficient of variation less than 12.3 % in milk sample, which showed a good correlation with LC-MS/MS. Thus, the proposed assay offers a rapid and broad-spectrum screening tool for simultaneous detection of GCs in milk.
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Affiliation(s)
- Jinxin He
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China.
| | - Yaqing Hou
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Wanqi Wu
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Yujiang Li
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Fang Tang
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
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2
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Yan X, Zhao K, Yang Y, Qiu A, Zhang X, Liu J, Zha C, Mai X, Ai F, Zheng X. Utilizing dual carriers assisted by enzyme digestion chemiluminescence signal enhancement strategy simultaneously detect tumor markers CEA and AFP. ANAL SCI 2022; 38:889-897. [PMID: 35403957 DOI: 10.1007/s44211-022-00109-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 03/12/2022] [Indexed: 11/26/2022]
Abstract
To measure two tumor biomarkers, alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA), a dual-carrier CL sensor with restriction enzyme digestion (Exo I) and aptamer technology utilizing gold nanoparticles (hydroxylamine amplification) and horseradish peroxidase (HRP) as the CL signal enhancement in the sensing strategy was formed. These nanoparticles and nano-enzyme were precisely detected and tagged to the appropriate position attributable to the particular recognition of biotin and streptavidin. In this sensing strategy, target markers were further enriched and recognized sensitively by CL following enrichment, and matching strong chemical signals were collected under luminol catalysis, allowing for marker identification. For CEA (0.1-80 ng/mL) and AFP (2-500 ng/mL), the proposed method has a large linear range, with detection limits of 36.6 pg/mL and 0.94 ng/mL, respectively.
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Affiliation(s)
- Xiluan Yan
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
- School of Pharmacy, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Kun Zhao
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Yunting Yang
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Aojun Qiu
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Xinlei Zhang
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Jie Liu
- School of Pharmacy, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Chengyi Zha
- Department of Pharmacy, The 3rd People's Hospital, Jingdezhen, 333000, China
| | - Xi Mai
- School of Pharmacy, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Fanrong Ai
- School of Mechanical & Electrical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China
| | - Xiangjuan Zheng
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, People's Republic of China.
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3
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The copolymer coating effect on the catalytic activity of magnetic carbon nanotube (CNT-Fe3O4) in the multi-component reactions. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04663-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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4
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Pekarsky A, Spadiut O. Intrinsically Magnetic Cells: A Review on Their Natural Occurrence and Synthetic Generation. Front Bioeng Biotechnol 2020; 8:573183. [PMID: 33195134 PMCID: PMC7604359 DOI: 10.3389/fbioe.2020.573183] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 09/29/2020] [Indexed: 12/31/2022] Open
Abstract
The magnetization of non-magnetic cells has great potential to aid various processes in medicine, but also in bioprocess engineering. Current approaches to magnetize cells with magnetic nanoparticles (MNPs) require cellular uptake or adsorption through in vitro manipulation of cells. A relatively new field of research is "magnetogenetics" which focuses on in vivo production and accumulation of magnetic material. Natural intrinsically magnetic cells (IMCs) produce intracellular, MNPs, and are called magnetotactic bacteria (MTB). In recent years, researchers have unraveled function and structure of numerous proteins from MTB. Furthermore, protein engineering studies on such MTB proteins and other potentially magnetic proteins, like ferritins, highlight that in vivo magnetization of non-magnetic hosts is a thriving field of research. This review summarizes current knowledge on recombinant IMC generation and highlights future steps that can be taken to succeed in transforming non-magnetic cells to IMCs.
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Affiliation(s)
| | - Oliver Spadiut
- Institute of Chemical, Environmental and Bioscience Engineering, Research Area Biochemical Engineering, Technische Universität Wien, Vienna, Austria
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5
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Sannigrahi S, Arumugasamy SK, Mathiyarasu J, K S. Magnetosome-anti-Salmonella antibody complex based biosensor for the detection of Salmonella typhimurium. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 114:111071. [PMID: 32993971 DOI: 10.1016/j.msec.2020.111071] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/27/2020] [Accepted: 05/07/2020] [Indexed: 12/17/2022]
Abstract
Epidemic Salmonellosis contracted through the consumption of contaminated food substances is a global concern. Thus, simple and effective diagnostic methods are needed. Magnetosome-based biosensors are gaining attention because of their promising features. Here, we developed a biosensor employing a magnetosome-anti-Salmonella antibody complex to detect lipopolysaccharide (somatic "O" antigen) and Salmonella typhimurium in real samples. Magnetosome was extracted from Magnetospirillum sp. RJS1 and characterized by microscopy. The magnetosome samples (1 and 2 mg/mL) were directly conjugated to anti-Salmonella antibody (0.8-200 μg/mL) and confirmed by spectroscopy and zeta potential. The concentrations of magnetosome, antibody and lipopolysaccharide were optimized by ELISA. The 2 mg/mL-0.8 μg/mL magnetosome-antibody complex was optimal for detecting lipopolysaccharide (0.001 μg/mL). Our assay is a cost-effective (60%) and sensitive (50%) method in detection of lipopolysaccharide. The optimized magnetosome-antibody complex was applied to an electrode surface and stabilized using an external magnetic field. Increased resistance confirmed the detection of lipopolysaccharide (at 0.001-0.1 μg/mL) using impedance spectroscopy. Significantly, the R2 value was 0.960. Then, the developed prototype biosensor was applied to food and water samples. ELISA confirmed the presence of lipopolysaccharide in homogenized infected samples and cross reactivity assays confirmed the specificity of the biosensor. Further, the biosensor showed low detection limit (101 CFU/mL) in water and milk sample demonstrating its sensitivity. Regression coefficient of 0.974 in water and 0.982 in milk was obtained. The magnetosome-antibody complex captured 90% of the S. typhimurium in real samples which was also confirmed in FE-SEM. Thus, the developed biosensor is selective, specific, rapid and sensitive for detection of S. typhimurium.
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Affiliation(s)
- Sumana Sannigrahi
- Marine Biotechnology and Bioproducts Laboratory, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Shiva Kumar Arumugasamy
- Electrodics and Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India
| | - Jayaraman Mathiyarasu
- Electrodics and Electrocatalysis Division, CSIR - Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India
| | - Suthindhiran K
- Marine Biotechnology and Bioproducts Laboratory, School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India.
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6
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Liu H, Li N, Liu X, Qian Y, Qiu J, Wang X. Poly(N-acryloyl-glucosamine-co-methylenebisacrylamide)-based hydrophilic magnetic nanoparticles for the extraction of aminoglycosides in meat samples. J Chromatogr A 2020; 1609:460517. [DOI: 10.1016/j.chroma.2019.460517] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 09/01/2019] [Accepted: 09/03/2019] [Indexed: 12/12/2022]
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7
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İçöz K, Gerçek T, Murat A, Özcan S, Ünal E. Capturing B type acute lymphoblastic leukemia cells using two types of antibodies. Biotechnol Prog 2018; 35:e2737. [PMID: 30353996 DOI: 10.1002/btpr.2737] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/07/2018] [Accepted: 10/16/2018] [Indexed: 11/07/2022]
Abstract
One way to monitor minimal residual disease (MRD) is to screen cells for multiple surface markers using flow cytometry. In order to develop an alternative microfluidic based method, isolation of B type acute lymphoblastic cells using two types of antibodies should be investigated. The immunomagnetic beads coated with various antibodies are used to capture the B type acute lymphoblastic cells. Single beads, two types of beads and surface immobilized antibody were used to measure the capture efficiency. Both micro and nanosize immunomagnetic beads can be used to capture B type acute lymphoblastic cells with a minimum efficiency of 94% and maximum efficiency of 98%. Development of a microfluidic based biochip incorporating immunomagnetic beads and surface immobilized antibodies for monitoring MRD can be an alternative to current cost and time inefficient laboratory methods. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 35: e2737, 2019.
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Affiliation(s)
- Kutay İçöz
- BioMINDS (Bio Micro/Nano Devices and Sensors) Lab, Dept. of Electrical and Electronics Engineering, Abdullah Gül University, Kayseri, Turkey
- Bioengineering Dept., Abdullah Gül University, Kayseri, Turkey
| | - Tayyibe Gerçek
- BioMINDS (Bio Micro/Nano Devices and Sensors) Lab, Dept. of Electrical and Electronics Engineering, Abdullah Gül University, Kayseri, Turkey
- Bioengineering Dept., Abdullah Gül University, Kayseri, Turkey
| | - Ayşegül Murat
- Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Turkey
| | - Servet Özcan
- Biology Dept., Erciyes University, Kayseri, Turkey
- Genome and Stem Cell Center (GENKOK), Erciyes University, Kayseri, Turkey
| | - Ekrem Ünal
- Pediatric Oncology Dept., Erciyes University, Kayseri, Turkey
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8
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Vargas G, Cypriano J, Correa T, Leão P, Bazylinski DA, Abreu F. Applications of Magnetotactic Bacteria, Magnetosomes and Magnetosome Crystals in Biotechnology and Nanotechnology: Mini-Review. Molecules 2018; 23:E2438. [PMID: 30249983 PMCID: PMC6222368 DOI: 10.3390/molecules23102438] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/17/2018] [Accepted: 09/20/2018] [Indexed: 12/31/2022] Open
Abstract
Magnetotactic bacteria (MTB) biomineralize magnetosomes, which are defined as intracellular nanocrystals of the magnetic minerals magnetite (Fe₃O₄) or greigite (Fe₃S₄) enveloped by a phospholipid bilayer membrane. The synthesis of magnetosomes is controlled by a specific set of genes that encode proteins, some of which are exclusively found in the magnetosome membrane in the cell. Over the past several decades, interest in nanoscale technology (nanotechnology) and biotechnology has increased significantly due to the development and establishment of new commercial, medical and scientific processes and applications that utilize nanomaterials, some of which are biologically derived. One excellent example of a biological nanomaterial that is showing great promise for use in a large number of commercial and medical applications are bacterial magnetite magnetosomes. Unlike chemically-synthesized magnetite nanoparticles, magnetosome magnetite crystals are stable single-magnetic domains and are thus permanently magnetic at ambient temperature, are of high chemical purity, and display a narrow size range and consistent crystal morphology. These physical/chemical features are important in their use in biotechnological and other applications. Applications utilizing magnetite-producing MTB, magnetite magnetosomes and/or magnetosome magnetite crystals include and/or involve bioremediation, cell separation, DNA/antigen recovery or detection, drug delivery, enzyme immobilization, magnetic hyperthermia and contrast enhancement of magnetic resonance imaging. Metric analysis using Scopus and Web of Science databases from 2003 to 2018 showed that applied research involving magnetite from MTB in some form has been focused mainly in biomedical applications, particularly in magnetic hyperthermia and drug delivery.
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Affiliation(s)
- Gabriele Vargas
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373, CCS, UFRJ, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Jefferson Cypriano
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373, CCS, UFRJ, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Tarcisio Correa
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373, CCS, UFRJ, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Pedro Leão
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373, CCS, UFRJ, Rio de Janeiro, RJ 21941-902, Brazil.
| | - Dennis A Bazylinski
- School of Life Sciences, University of Nevada at Las Vegas, Las Vegas, NV 89154-4004, USA.
| | - Fernanda Abreu
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373, CCS, UFRJ, Rio de Janeiro, RJ 21941-902, Brazil.
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9
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Ren E, Lei Z, Wang J, Zhang Y, Liu G. Magnetosome Modification: From Bio-Nano Engineering Toward Nanomedicine. ADVANCED THERAPEUTICS 2018. [DOI: 10.1002/adtp.201800080] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- En Ren
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics and Center for Molecular Imaging and Translational Medicine; School of Public Health; Xiamen University; Xiamen 361102 China
| | - Zhao Lei
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics and Center for Molecular Imaging and Translational Medicine; School of Public Health; Xiamen University; Xiamen 361102 China
| | - Junqing Wang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics and Center for Molecular Imaging and Translational Medicine; School of Public Health; Xiamen University; Xiamen 361102 China
| | - Yang Zhang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics and Center for Molecular Imaging and Translational Medicine; School of Public Health; Xiamen University; Xiamen 361102 China
| | - Gang Liu
- State Key Laboratory of Cellular Stress Biology; Innovation Center for Cell Biology; School of Life Sciences; Xiamen University; Xiamen 361102 China
- The MOE Key Laboratory of Spectrochemical Analysis & Instrumentation; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
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10
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Lee AHF, Gessert SF, Chen Y, Sergeev NV, Haghiri B. Preparation of iron oxide silica particles for Zika viral RNA extraction. Heliyon 2018; 4:e00572. [PMID: 29556569 PMCID: PMC5854921 DOI: 10.1016/j.heliyon.2018.e00572] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 12/05/2017] [Accepted: 03/08/2018] [Indexed: 12/19/2022] Open
Abstract
In this work, a robust synthetic pathway for magnetic core preparation and silica surface coating of magnetic microparticles is presented. Silica-coated magnetic particles are widely used to extract DNA and RNA from various biological samples. We present a novel route for the synthesis of iron oxide silica particles (Fe3O4@Silica) and demonstrate their performance for extracting ZIKA viral RNA from serum. The iron (II, III) oxide (Fe3O4), magnetite core is first prepared by ammonia neutralization of ferrous and ferric chloride aqueous solution under argon, followed by the addition of citrate salt to stabilize the surface of the resultant magnetic nanospheres. After this one-pot, two-step synthesis, the magnetic nanospheres are consumed during silica coating by hydrolysis of tetraethoxysilane (TEOS) under alkaline condition. The final product is a sphere-like magnetic aggregate with a size range of 1–2 micron. By simply suspending the magnetic aggregates in guanidinium chloride solution, the silica surface can be prepared for RNA binding. The RNA extraction efficiency was evaluated by extracting ZIKA viral RNA from serum followed by a PCR-based assay. The data indicate excellent recovery of target RNA and removal of PCR inhibitors. This manufacturing procedure for the silica coated microparticles provides a low-cost, effective and ready for scale-up method whose performance is equivalent to commercial alternatives such as magnetic silica surface particles for DNA and RNA sample preparations. The cost of the clinical assays could be largely decreased due to the 100 fold reduction in cost by replacing the commercially available magnetic particles with the developed material for RNA extraction.
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Affiliation(s)
- Alex H F Lee
- Theranos Inc., 7333 Gateway Blvd, Newark, CA 94560, USA
| | | | - Yutao Chen
- Theranos Inc., 7333 Gateway Blvd, Newark, CA 94560, USA
| | | | - Babak Haghiri
- Theranos Inc., 7333 Gateway Blvd, Newark, CA 94560, USA
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11
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Zhu F, Mao C, Du D. Time-resolved immunoassay based on magnetic particles for the detection of diethyl phthalate in environmental water samples. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 601-602:723-731. [PMID: 28577407 DOI: 10.1016/j.scitotenv.2017.05.111] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 04/26/2017] [Accepted: 05/13/2017] [Indexed: 06/07/2023]
Abstract
Diethyl phthalate (DEP) is an extensively used phthalic acid diester (PAEs) with estrogenic activity and the potential for carcinogenic and teratogenic effects. To monitor trace DEP in environmental waters, a sensitive direct competitive time-resolved fluoroimmunoassay based on magnetic particles (MPs) as solid support was established. For the assay system, the anti-DEP antibody was oriented on the surface of the MPs using goat anti-rabbit antibody as linkers, and DEP-OVA was labeled using Eu3+. Several physicochemical factors that potentially influence the assay performance of the proposed method were investigated in detail, including concentration of MPs, dilution of DEP-OVA-Eu3+ and incubation time. Under the optimized conditions, the method showed: (i) low limit of detection (LOD) of 5.92ng/L; (ii) satisfactory accuracy (recoveries, 91.97-134.54%) with good reproducibility (inter-CV, 4.17-9.17%; intra-CV, 7.41-14.72%). All of which indicated that the newly established method had much higher efficiency and great potential for use in environmental water analysis for DEP. In addition, the proposed immunoassay was applied for investigation of DEP in aquatic environments at Zhenjiang City. Our results showed that DEP was detected at the concentration of 2.98-65.18ng/mL in river samples and 46.95-306.19ng/mL in wastewater treatment plants (WWTPs), which showed rather high concentrations compared with reported data. Our study provides background data important for risk assessment and contamination control of DEP in the aquatic environment of this area.
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Affiliation(s)
- Fang Zhu
- School of the Environment and Safety Engineering, Institute of Environment and Ecology, Jiangsu University, Zhenjiang 212013, China
| | - Chaoming Mao
- Department of Nuclear Medicine, The Affiliated Hospital of Jiangsu University, Zhenjiang 212013, China
| | - Daolin Du
- School of the Environment and Safety Engineering, Institute of Environment and Ecology, Jiangsu University, Zhenjiang 212013, China.
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12
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Kutralam-Muniasamy G, Perez-Guevara F. Recombinant surface engineering to enhance and expand the potential of biologically produced nanoparticles: A review. Process Biochem 2017. [DOI: 10.1016/j.procbio.2016.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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13
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Yan L, Da H, Zhang S, López VM, Wang W. Bacterial magnetosome and its potential application. Microbiol Res 2017; 203:19-28. [PMID: 28754204 DOI: 10.1016/j.micres.2017.06.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 06/08/2017] [Accepted: 06/17/2017] [Indexed: 01/01/2023]
Abstract
Bacterial magnetosome, synthetized by magnetosome-producing microorganisms including magnetotactic bacteria (MTB) and some non-magnetotactic bacteria (Non-MTB), is a new type of material comprising magnetic nanocrystals surrounded by a phospholipid bilayer. Because of the special properties such as single magnetic domain, excellent biocompatibility and surface modification, bacterial magnetosome has become an increasingly attractive for researchers in biology, medicine, paleomagnetism, geology and environmental science. This review briefly describes the general feature of magnetosome-producing microorganisms. This article also highlights recent advances in the understanding of the biochemical and magnetic characteristics of bacterial magnetosome, as well as the magnetosome formation mechanism including iron ions uptake, magnetosome membrane formation, biomineralization and magnetosome chain assembly. Finally, this review presents the potential applications of bacterial magnetosome in biomedicine, wastewater treatment, and the significance of mineralization of magnetosome in biology and geology.
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Affiliation(s)
- Lei Yan
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China.
| | - Huiyun Da
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Shuang Zhang
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Viviana Morillo López
- School of Life Sciences, University of Nevada at Las Vegas, Las Vegas, NV 89154, USA
| | - Weidong Wang
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
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14
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Kim JJ, Sinkala E, Herr AE. High-selectivity cytology via lab-on-a-disc western blotting of individual cells. LAB ON A CHIP 2017; 17:855-863. [PMID: 28165521 PMCID: PMC5435485 DOI: 10.1039/c6lc01333c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cytology of sparingly available cell samples from both clinical and experimental settings would benefit from high-selectivity protein tools. To minimize cell handling losses in sparse samples, we design a multi-stage assay using a lab-on-a-disc that integrates cell handling and subsequent single-cell western blotting (scWestern). As the two-layer microfluidic device rotates, the induced centrifugal force directs dissociated cells to dams, which in turn localize the cells over microwells. Cells then sediment into the microwells, where the cells are lysed and subjected to scWestern. Taking into account cell losses from loading, centrifugation, and lysis-buffer exchange, our lab-on-a-disc device handles cell samples with as few as 200 cells with 75% cell settling efficiencies. Over 70% of microwells contain single cells after the centrifugation. In addition to cell settling efficiency, cell-size filtration from a mixed population of two cell lines is also realized by tuning the cell time-of-flight during centrifugation (58.4% settling efficiency with 6.4% impurity). Following the upstream cell handling, scWestern analysis detects four proteins (GFP, β-TUB, GAPDH, and STAT3) in a glioblastoma cell line. By integrating the lab-on-a-disc cell preparation and scWestern analysis, our platform measures proteins from sparse cell samples at single-cell resolution.
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Affiliation(s)
- John J Kim
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, USA. and University of California, Berkeley - UCSF Graduate Program in Bioengineering, Berkeley, CA 94720, USA
| | - Elly Sinkala
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, USA.
| | - Amy E Herr
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, USA. and University of California, Berkeley - UCSF Graduate Program in Bioengineering, Berkeley, CA 94720, USA
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15
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Wang Y, Li Y, Wang R, Wang M, Lin J. Three-dimensional printed magnetophoretic system for the continuous flow separation of avian influenza H5N1 viruses. J Sep Sci 2017; 40:1540-1547. [DOI: 10.1002/jssc.201601379] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Revised: 01/18/2017] [Accepted: 01/19/2017] [Indexed: 01/26/2023]
Affiliation(s)
- Yuhe Wang
- Key Laboratory of Agricultural Information Acquisition Technology (Beijing); Ministry of Agriculture; China Agricultural University; Beijing P.R. China
- Department of Biological and Agricultural Engineering; Center of Excellence for Poultry Science; University of Arkansas; Fayetteville AR USA
| | - Yanbin Li
- Department of Biological and Agricultural Engineering; Center of Excellence for Poultry Science; University of Arkansas; Fayetteville AR USA
| | - Ronghui Wang
- Department of Biological and Agricultural Engineering; Center of Excellence for Poultry Science; University of Arkansas; Fayetteville AR USA
| | - Maohua Wang
- Key Laboratory of Modern Precision Agriculture System Integration Research; Ministry of Education; China Agricultural University; Beijing P.R. China
| | - Jianhan Lin
- Key Laboratory of Agricultural Information Acquisition Technology (Beijing); Ministry of Agriculture; China Agricultural University; Beijing P.R. China
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In situ single cell detection via microfluidic magnetic bead assay. PLoS One 2017; 12:e0172697. [PMID: 28222140 PMCID: PMC5319813 DOI: 10.1371/journal.pone.0172697] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/08/2017] [Indexed: 01/13/2023] Open
Abstract
We present a single cell detection device based on magnetic bead assay and micro Coulter counters. This device consists of two successive micro Coulter counters, coupled with a high gradient magnetic field generated by an external magnet. The device can identify single cells in terms of the transit time difference of the cell through the two micro Coulter counters. Target cells are conjugated with magnetic beads via specific antibody and antigen binding. A target cell traveling through the two Coulter counters interacts with the magnetic field, and have a longer transit time at the 1st counter than that at the 2nd counter. In comparison, a non-target cell has no interaction with the magnetic field, and hence has nearly the same transit times through the two counters. Each cell passing through the two counters generates two consecutive voltage pulses one after the other; the pulse widths and magnitudes indicating the cell’s transit times through the counters and the cell’s size respectively. Thus, by measuring the pulse widths (transit times) of each cell through the two counters, each single target cell can be differentiated from non-target cells even if they have similar sizes. We experimentally proved that the target human umbilical vein endothelial cells (HUVECs) and non-target rat adipose-derived stem cells (rASCs) have significant different transit time distribution, from which we can determine the recognition regions for both cell groups quantitatively. We further demonstrated that within a mixed cell population of rASCs and HUVECs, HUVECs can be detected in situ and the measured HUVECs ratios agree well with the pre-set ratios. With the simple device structure and easy sample preparation, this method is expected to enable single cell detection in a continuous flow and can be applied to facilitate general cell detection applications such as stem cell identification and enumeration.
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Jacob JJ, Suthindhiran K. Magnetotactic bacteria and magnetosomes - Scope and challenges. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 68:919-928. [PMID: 27524094 DOI: 10.1016/j.msec.2016.07.049] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 06/24/2016] [Accepted: 07/19/2016] [Indexed: 10/21/2022]
Abstract
Geomagnetism aided navigation has been demonstrated by certain organisms which allows them to identify a particular location using magnetic field. This attractive technique to recognize the course was earlier exhibited in numerous animals, for example, birds, insects, reptiles, fishes and mammals. Magnetotactic bacteria (MTB) are one of the best examples for magnetoreception among microorganisms as the magnetic mineral functions as an internal magnet and aid the microbe to move towards the water columns in an oxic-anoxic interface (OAI). The ability of MTB to biomineralize the magnetic particles (magnetosomes) into uniform nano-sized, highly crystalline structure with uniform magnetic properties has made the bacteria an important topic of research. The superior properties of magnetosomes over chemically synthesized magnetic nanoparticles made it an attractive candidate for potential applications in microbiology, biophysics, biochemistry, nanotechnology and biomedicine. In this review article, the scope of MTB, magnetosomes and its challenges in research and industrial application have been discussed in brief. This article mainly focuses on the application based on the magnetotactic behaviour of MTB and magnetosomes in different areas of modern science.
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Affiliation(s)
- Jobin John Jacob
- Marine Biotechnology and Bioproducts Lab, School of Biosciences and Technology, VIT University, Vellore 632014, India
| | - K Suthindhiran
- Marine Biotechnology and Bioproducts Lab, School of Biosciences and Technology, VIT University, Vellore 632014, India.
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18
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Yang F, Xiao W, Ma X, Huang R, Yu R, Li G, Huang X, Chen C, Ding P. Optimization of a novel chelerythrine-loaded magnetic Fe3 O4 /chitosan alpha-ketoglutaric acid system and evaluation of its anti-tumour activities. J Pharm Pharmacol 2016; 68:1030-40. [PMID: 27293067 DOI: 10.1111/jphp.12564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 03/29/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVES A novel magnetic targeting anti-tumour drug delivery system (Fe3 O4 /KCTS-CHE) was designed using magnetic Fe3 O4 /chitosan alpha-ketoglutaric acid (Fe3 O4 /KCTS) as carrier and chelerythrine (CHE) as an anti-tumour drug model. Moreover, the anti-tumour activities and mechanisms of Fe3 O4 /KCTS-CHE were investigated. METHODS The preparation conditions of Fe3 O4 /KCTS-CHE microspheres were optimized by response surface methodology (RSM). The CHE drug release kinetics was evaluated by fitting the experimental data to standard release equations. The inhibitive activities of Fe3 O4 /KCTS-CHE microspheres against the HepG2 cells were estimated using MTT assay in vitro, and the mechanisms were studied using Hoechst 33258 staining. KEY FINDINGS The optimum preparation conditions were 11.68 : 1 for Fe3 O4 /KCTS:CHE ratio, 4 : 1 for oil/water ratio and 50.03 min for the ultrasonic time. The drug loading content and entrapment efficiency under the optimal conditions were 23.3% and 50.9%. The best fit was Higuchi model for the microspheres. The inhibitive rate on HepG2 cells of Fe3 O4 /KCTS-CHE nanoparticles varied from 30.19 ± 2.64% to 70.46 ± 6.42% at different concentrations from 50 to 400 mg/l in 72 h. CONCLUSION Fe3 O4 /KCTS-CHE exhibited effective anti-tumour activities against the HepG2 cells and induced cell apoptosis in HepG2 cells. Fe3 O4 /KCTS-CHE possess a high drug loading efficiency and entrapment efficiency, which are a new matrix for controlling release of drugs and a promising candidate for targeted drug delivery.
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Affiliation(s)
- Fei Yang
- School of Public Health, Central South University, Changsha, China.,Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Wen Xiao
- School of Public Health, Central South University, Changsha, China
| | - Xiaohua Ma
- Department of Chemical and Engineering, China University of Mining and Technology, Xuzhou, China
| | - Ruixue Huang
- School of Public Health, Central South University, Changsha, China
| | - Ran Yu
- Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Guiyin Li
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin, China
| | - Xiao Huang
- School of Public Health, Central South University, Changsha, China
| | - Cuimei Chen
- School of Public Health, Central South University, Changsha, China
| | - Ping Ding
- School of Public Health, Central South University, Changsha, China
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Highly stable multi-anchored magnetic nanoparticles for optical imaging within biofilms. J Colloid Interface Sci 2015; 459:175-182. [DOI: 10.1016/j.jcis.2015.08.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Revised: 08/03/2015] [Accepted: 08/04/2015] [Indexed: 11/18/2022]
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Abstract
Magnetotactic bacteria (MTB) represent a heterogeneous group of Gram-negative aquatic prokaryotes with a broad range of morphological types, including vibrioid, coccoid, rod and spirillum. MTBs possess the virtuosity to passively align and actively swim along the magnetic field. Magnetosomes are the trademark nano-ranged intracellular structures of MTB, which comprise magnetic iron-bearing inorganic crystals enveloped by an organic membrane, and are dedicated organelles for their magnetotactic lifestyle. Magnetosomes endue high and even dispersion in aqueous solutions compared with artificial magnetites, claiming them as paragon nanomaterials. MTB and magnetosomes offer high technological potential in modern science, technology and medicines. This review focuses on the applicability of MTB and magnetosomes in various areas of modern benefits.
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Honda T, Maeda Y, Yasuda T, Tanaka T, Matsunaga T, Yoshino T. Novel designs of single-chain MHC I/peptide complex for the magnetosome display system. Protein Eng Des Sel 2015; 28:53-8. [DOI: 10.1093/protein/gzu056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Xue X, Wang B, Xi X, Chu Q, Wei Y. Polymer decorated magnetite materials as smart protein separators to manipulate the high loading of heme proteins. NEW J CHEM 2015. [DOI: 10.1039/c5nj00677e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Polymer decorated magnetite materials using polyvinyl imidazole were successfully fabricated, which could separate high-abundance heme proteins from blood efficiently.
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Affiliation(s)
- Xue Xue
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Binghai Wang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Xingjun Xi
- China National Institute of Standardization
- Beijing 100191
- P. R. China
| | - Qiao Chu
- China National Institute of Standardization
- Beijing 100191
- P. R. China
| | - Yun Wei
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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Butler KS, Adolphi NL, Bryant HC, Lovato DM, Larson RS, Flynn ER. Modeling the efficiency of a magnetic needle for collecting magnetic cells. Phys Med Biol 2014; 59:3319-35. [PMID: 24874577 DOI: 10.1088/0031-9155/59/13/3319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
As new magnetic nanoparticle-based technologies are developed and new target cells are identified, there is a critical need to understand the features important for magnetic isolation of specific cells in fluids, an increasingly important tool in disease research and diagnosis. To investigate magnetic cell collection, cell-sized spherical microparticles, coated with superparamagnetic nanoparticles, were suspended in (1) glycerine-water solutions, chosen to approximate the range of viscosities of bone marrow, and (2) water in which 3, 5, 10 and 100% of the total suspended microspheres are coated with magnetic nanoparticles, to model collection of rare magnetic nanoparticle-coated cells from a mixture of cells in a fluid. The magnetic microspheres were collected on a magnetic needle, and we demonstrate that the collection efficiency versus time can be modeled using a simple, heuristically-derived function, with three physically-significant parameters. The function enables experimentally-obtained collection efficiencies to be scaled to extract the effective drag of the suspending medium. The results of this analysis demonstrate that the effective drag scales linearly with fluid viscosity, as expected. Surprisingly, increasing the number of non-magnetic microspheres in the suspending fluid results increases the collection of magnetic microspheres, corresponding to a decrease in the effective drag of the medium.
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Affiliation(s)
- Kimberly S Butler
- Department of Pathology, University of New Mexico Health Sciences Center, 1 University of New Mexico, Albuquerque, NM 87131, USA
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24
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Wierucka M, Biziuk M. Application of magnetic nanoparticles for magnetic solid-phase extraction in preparing biological, environmental and food samples. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2014.04.007] [Citation(s) in RCA: 324] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Spera R, Petralito S, Liberti M, Merla C, d'Inzeo G, Pinto R, Apollonio F. Controlled release from magnetoliposomes aqueous suspensions exposed to a low intensity magnetic field. Bioelectromagnetics 2014; 35:309-12. [PMID: 24482311 DOI: 10.1002/bem.21841] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 01/06/2014] [Indexed: 11/10/2022]
Abstract
Recently, the use of liposomes loaded with magnetic nanoparticles (magnetoliposomes, (MLs)) has been intensely growing as a new drug delivery system. With the use of alternating magnetic fields, it is possible to remotely control the delivery of a drug or any other macromolecule loaded inside the MLs. In this experiment, the release of a fluorescent dye from MLs is achieved through an alternating magnetic field of 20 kHz and amplitude below 100 A/m, and without a macroscopic temperature increase.
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Affiliation(s)
- Romina Spera
- Department of Chemistry and Drug Technology, Sapienza University of Rome, Rome, Italy
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26
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Tumturk H, Sahin F, Turan E. Magnetic nanoparticles coated with different shells for biorecognition: high specific binding capacity. Analyst 2014; 139:1093-100. [DOI: 10.1039/c3an01726e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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27
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Tran TNN, Cui J, Hartman MR, Peng S, Funabashi H, Duan F, Yang D, March JC, Lis JT, Cui H, Luo D. A universal DNA-based protein detection system. J Am Chem Soc 2013; 135:14008-11. [PMID: 23978265 DOI: 10.1021/ja405872g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Protein immune detection requires secondary antibodies which must be carefully selected in order to avoid interspecies cross-reactivity, and is therefore restricted by the limited availability of primary/secondary antibody pairs. Here we present a versatile DNA-based protein detection system using a universal adapter to interface between IgG antibodies and DNA-modified reporter molecules. As a demonstration of this capability, we successfully used DNA nano-barcodes, quantum dots, and horseradish peroxidase enzyme to detect multiple proteins using our DNA-based labeling system. Our system not only eliminates secondary antibodies but also serves as a novel method platform for protein detection with modularity, high capacity, and multiplexed capability.
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Affiliation(s)
- Thua N N Tran
- Department of Biological & Environmental Engineering, ∥Department of Molecular Biology and Genetics, and ⊥Kavli Institute at Cornell for Nanoscale Science, Cornell University , Ithaca, New York 14853, United States
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Yan J, Horák D, Lenfeld J, Hammond M, Kamali-Moghaddam M. A tosyl-activated magnetic bead cellulose as solid support for sensitive protein detection. J Biotechnol 2013; 167:235-40. [DOI: 10.1016/j.jbiotec.2013.06.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 06/12/2013] [Accepted: 06/18/2013] [Indexed: 11/25/2022]
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Enhanced heterologous protein display on bacterial magnetic particles using a lon protease gene deletion mutant in Magnetospirillum magneticum AMB-1. J Biosci Bioeng 2013; 116:65-70. [PMID: 23578586 DOI: 10.1016/j.jbiosc.2013.01.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 01/24/2013] [Indexed: 11/23/2022]
Abstract
Bacterial magnetic particles (BacMPs) produced by the magnetotactic bacterium Magnetospirillum magneticum AMB-1, are used as magnetic supports or carriers for a variety of biomedical and environmental applications. Although protein expression systems on BacMPs have been established in previous studies, the expression efficiency was dependent on the introduced protein sequences. Recombinant human proteins are often poorly expressed on BacMPs because of proteolytic degradation by endogenous proteases. We constructed a lon protease gene deletion mutant strain (Δlon) of M. magneticum AMB-1 by homologous recombination to increase the efficiency of functional protein display on BacMPs using Δlon host cells. Wild-type and Δlon-M. magneticum AMB-1 cells were transformed using expression plasmids for human proteins, thyroid-stimulating hormone receptor (TSHR) and the class II major histocompatibility complex (MHC II) molecules onto BacMPs. Although mRNA expression of both TSHR and MHC II was the same level in the wild-type and Δlon transformants, the protein expression levels in Δlon transformants were significantly increased versus wild-type cells. Furthermore, the amounts of two different human proteins on BacMPs were successfully improved. This phenomenon could be due to the reduction of the degradation of target proteins in the Δlon strain. This is the first report to construct a protease deletion mutant in magnetotactic bacteria. The Δlon strain is a useful host to provide BacMPs displaying target proteins for various experimental, and ultimately, clinical applications.
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30
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XU HAILONG, ZHANG QIUYU, ZHANG HEPENG, ZHANG BAOLIANG, YIN CHANGJIE. THE SIMULATION OF POLYSTYRENE/NANOPARTICLES COMPOSITE MICROSPHERES USING DISSIPATIVE PARTICLE DYNAMICS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633612501118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Dissipative particle dynamics (DPD) was initially used to simulate the polystyrene/nanoparticle composite microspheres (PNCM) in this paper. The coarse graining model of PNCM was established. And the DPD parameterization of the model was represented in detail. The DPD repulsion parameters were calculated from the cohesive energy density which could be calculated by amorphous modules in Materials Studio. The equilibrium configuration of the simulated PNCM shows that the nanoparticles were actually "modified" with oleic acid and the modified nanoparticles were embedded in the bulk of polystyrene. As sodium dodecyl sulfate (SDS) was located in the interface between water and polystyrene, the hydrophilic head of SDS stretched into water while the hydrophobic tailed into polystyrene. All simulated phenomena were consistent with the experimental results in preparation of polystyrene/nanoparticles composite microspheres. The effect of surface modification of nanoparticles on its dispersion in polystyrene matrix was also studied by adjusting the interaction parameters between the OA and NP beads. The final results indicated that the nanoparticles removed from the core of composite microsphere to the surface with increase of a OA-NP . All the simulated results demonstrated that our coarse–grained model was reasonable.
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Affiliation(s)
- HAILONG XU
- Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710129, P. R. China
| | - QIUYU ZHANG
- Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710129, P. R. China
| | - HEPENG ZHANG
- Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710129, P. R. China
| | - BAOLIANG ZHANG
- Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710129, P. R. China
| | - CHANGJIE YIN
- Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710129, P. R. China
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31
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Liu W, Zhang Y, Ge S, Song X, Huang J, Yan M, Yu J. Core–shell Fe3O4–Au magnetic nanoparticles based nonenzymatic ultrasensitive electrochemiluminescence immunosensor using quantum dots functionalized graphene sheet as labels. Anal Chim Acta 2013; 770:132-9. [DOI: 10.1016/j.aca.2013.01.039] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2012] [Revised: 12/18/2012] [Accepted: 01/17/2013] [Indexed: 01/19/2023]
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32
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Lu H, Ni K, Wang C, Black KC, Wei D, Ren Y, Messersmith PB. A novel technique for in situ aggregation of Gluconobacter oxydans using bio-adhesive magnetic nanoparticles. Biotechnol Bioeng 2012; 109:2970-7. [PMID: 22729662 PMCID: PMC3477288 DOI: 10.1002/bit.24582] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 05/02/2012] [Accepted: 06/11/2012] [Indexed: 01/22/2023]
Abstract
Here, we present a novel technique to immobilize magnetic particles onto whole Gluconobacter oxydans in situ via a synthetic adhesive biomimetic material inspired by the protein glues of marine mussels. Our approach involves simple coating of a cell adherent polydopamine film onto magnetic nanoparticles, followed by conjugation of the polydopamine-coated nanoparticles to G. oxydans which resulted in cell aggregation. After optimization, 21.3 mg (wet cell weight) G. oxydans per milligram of nanoparticle was aggregated and separated with a magnet. Importantly, the G. oxydan aggregates showed high specific activity and good reusability. The facile approach offers the potential advantages of low cost, easy cell separation, low diffusion resistance, and high efficiency. Furthermore, the approach is a convenient platform technique for magnetization of cells in situ by direct mixing of nanoparticles with a cell suspension.
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Affiliation(s)
- Huimin Lu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Kefeng Ni
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Cunxun Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Kvar C.L. Black
- Biomedical Engineering Department, Northwestern University, Evanston 60208, USA
- Chemistry of Life Processes Institute, Northwestern University, Evanston 60208, USA
| | - Dongzhi Wei
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yuhong Ren
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Phillip B. Messersmith
- Biomedical Engineering Department, Northwestern University, Evanston 60208, USA
- Chemistry of Life Processes Institute, Northwestern University, Evanston 60208, USA
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Ariyasu S, Hanaya K, Watanabe E, Suzuki T, Horie K, Hayase M, Abe R, Aoki S. Selective capture and collection of live target cells using a photoreactive silicon wafer device modified with antibodies via a photocleavable linker. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13118-13126. [PMID: 22889078 DOI: 10.1021/la302393p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A device for the capture and recollection of live target cells is described. The platform was a silicon (Si) wafer modified with an anti-HEL antibody (anti-HEL-IgG, HEL = hen egg lysozyme) through a photocleavable 3-amino-3-(2-nitrophenyl)propionic acid (ANP) linker. The modification processes of the Si wafer surface were monitored by Fourier transform infrared spectroscopy-attenuated total reflection (FTIR-ATR) and fast-scanning atomic force microscopy (FS-AFM). The attachment of IgG and its release reaction on the Si surface via the photochemical cleavage of the ANP linker were observed directly by FS-AFM. The results of an enzyme-linked immunosorbent assay (ELISA) indicated that the photorelease of the complex of anti-HEL-IgG with the secondary antibody-alkaline phosphatase hybrid (secondary IgG-AP) from the Si surface occurs with minimum damage. Furthermore, it was possible to collect SP2/O cells selectively that express HEL on their cell membranes (SP2/O-HEL) on the Si wafer device. Photochemical cleavage of the ANP linker facilitated the effective release of living SP2/O cells whose viability was verified by staining experiments using tripan blue. Moreover, it was possible to reculture the recovered cells. This methodology represents an effective strategy for isolating intact target cells in the biological and medicinal sciences and related fields.
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Affiliation(s)
- Shinya Ariyasu
- Center for Technologies against Cancer, Tokyo University of Science, 2641 Yamazaki, Noda, Japan
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Chen H, Zeng Y, Liu W, Zhao S, Wu J, Du Y. Multifaceted applications of nanomaterials in cell engineering and therapy. Biotechnol Adv 2012; 31:638-53. [PMID: 22922117 DOI: 10.1016/j.biotechadv.2012.08.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 08/10/2012] [Accepted: 08/10/2012] [Indexed: 12/13/2022]
Abstract
Nanomaterials with superior physiochemical properties have been rapidly developed and integrated in every aspect of cell engineering and therapy for translating their great promise to clinical success. Here we demonstrate the multifaceted roles played by innovatively-designed nanomaterials in addressing key challenges in cell engineering and therapy such as cell isolation from heterogeneous cell population, cell instruction in vitro to enable desired functionalities, and targeted cell delivery to therapeutic sites for prompting tissue repair. The emerging trends in this interdisciplinary and dynamic field are also highlighted, where the nanomaterial-engineered cells constitute the basis for establishing in vitro disease model; and nanomaterial-based in situ cell engineering are accomplished directly within the native tissue in vivo. We will witness the increasing importance of nanomaterials in revolutionizing the concept and toolset of cell engineering and therapy which will enrich our scientific understanding of diseases and ultimately fulfill the therapeutic demand in clinical medicine.
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Affiliation(s)
- Hui Chen
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China
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Kanetsuki Y, Tanaka M, Tanaka T, Matsunaga T, Yoshino T. Effective expression of human proteins on bacterial magnetic particles in an anchor gene deletion mutant of Magnetospirillum magneticum AMB-1. Biochem Biophys Res Commun 2012; 426:7-11. [PMID: 22846572 DOI: 10.1016/j.bbrc.2012.07.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Accepted: 07/20/2012] [Indexed: 11/26/2022]
Abstract
Biologically synthesized magnetic particles by magnetotactic bacteria (BacMPs) have promising potential in the area of functional protein display technology for various biotechnological and biomedical applications. Functional proteins fused with an anchor protein, Mms13, have been demonstrated to be an effective and stable method for the display of functional proteins on BacMPs. However, the expression of some human proteins is relatively low. Useful host strains of Escherichia coli have been developed for the enhanced expression of recombinant proteins using a genetic engineering approach. To improve human protein expression level on BacMPs in Magnetospirillummagneticum AMB-1, a mutant strain with a deleted native mms13 gene (Δmms13 strain) was established and evaluated for effective functional protein display technology. As a result, the Δmms13 strain synthesized BacMPs with significantly improved expression of two human proteins, thyroid-stimulating hormone receptor (TSHR) and the class II major histocompatibility complex (MHC II) molecules. The Δmms13 strain could therefore be an effective strain for the display of other important human proteins on BacMPs and may be useful for further applications.
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Affiliation(s)
- Yuka Kanetsuki
- Division of Biotechnology and Life Science, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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Wu J, Gao L, Gao D. Multistage magnetic separation of microspheres enabled by temperature-responsive polymers. ACS APPLIED MATERIALS & INTERFACES 2012; 4:3041-3046. [PMID: 22568650 DOI: 10.1021/am3004076] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A simple and rapid method for separation of cells is to functionalize magnetic particles with a receptor that selectively captures the target and then pull the magnetic particles out of the mixture upon applying a magnetic field. The separation efficiency of magnetic separation, however, is typically limited by the nonspecific interaction between the magnetic particles and nontarget species. We here present a multistage separation process that is able to effectively circumvent the problem caused by the nonspecific interactions by introducing multiple capture-and-release cycles to the magnetic separation process. The multiple capture-and-release cycles are enabled by attaching a temperature-responsive polymer to both the magnetic particles and the targets. Through temperature cycling, we demonstrate that target microspheres can be separated from nontarget microspheres in multiple separation stages. The overall enrichment factor significantly increases with the number of separation stages and reaches as high as 1.87 × 10(5) after 5 cycles.
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Affiliation(s)
- Jiamin Wu
- Department of Chemical and Petroleum Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
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Efficient DNA release from PAMAM dendrimer-modified superparamagnetic nanoparticles for DNA recovery. Polym J 2012. [DOI: 10.1038/pj.2012.32] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zhao Y, Hao C, Yong Q, Qu C, Chen W, Peng C, Kuang H, Zhou H, Wang L, Xu C. Systematic comparisons of genetically modified organism DNA separation and purification by various functional magnetic nanoparticles. Int J Food Sci Technol 2012. [DOI: 10.1111/j.1365-2621.2011.02921.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Jahns AC, Rehm BHA. Relevant uses of surface proteins--display on self-organized biological structures. Microb Biotechnol 2011; 5:188-202. [PMID: 21906264 PMCID: PMC3815779 DOI: 10.1111/j.1751-7915.2011.00293.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Proteins are often found attached to surfaces of self‐assembling biological units such as whole microbial cells or subcellular structures, e.g. intracellular inclusions. In the last two decades surface proteins were identified that could serve as anchors for the display of foreign protein functions. Extensive protein engineering based on structure–function data enabled efficient display of technically and/or medically relevant protein functions. Small size, diversity of the anchor protein as well as support structure, genetic manipulability and controlled cultivation of phages, bacterial cells and yeasts contributed to the establishment of designed and specifically functionalized tools for applications as sensors, catalysis, biomedicine, vaccine development and library‐based screening technologies. Traditionally, phage display is employed for library screening but applications in biomedicine and vaccine development are also perceived. For some diagnostic purposes phages are even too small in size so other carrier materials where needed and gave way for cell and yeast display. Only recently, intracellular inclusions such as magnetosomes, polyhydroxyalkanoate granules and lipid bodies were conceived as stable subcellular structures enabling the display of foreign protein functions and showing potential as specific and tailor‐made devices for medical and biotechnological applications.
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Affiliation(s)
- Anika C Jahns
- Institute of Molecular BioSciences, Massey University, Private Bag 11222, Palmerston North, New Zealand
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40
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Synthesis of Core/Shell Magnetic Porous Microspheres for Lipase Immobilization. J Inorg Organomet Polym Mater 2011. [DOI: 10.1007/s10904-011-9561-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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41
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Abstract
Many nanotechnologies, which enable unique approaches to treat cancer, have been developed based upon non-toxic organic and inorganic materials to improve current cancer treatments. The use of inorganic materials to form magnetic nanoparticles for hyperthermia therapy is of great interest for localized treatment of cancers without effecting adjacent healthy tissue. Extensive clinical trials have begun using magnetic hyperthermia in animal models. The purpose of this article is to address different factors that affect targeting, heating and biodistribution to safely control the therapeutic efficacy of targeted magnetic hyperthermia. This method involves accumulation of magnetic nanoparticles at a tumor site and then manipulating the magnetic properties of the nanoparticles to heat the targeted tissues.
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Yoshino T, Kaji C, Matsunaga T. Bioengineering of bacterial magnetic particles and its application to estrogen receptor-ligand binding assay. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1094-dd04-03] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractMagnetic particles are used for various biomedical applications because they are easy to both handle and separate from biological samples. Nano-sized bacterial magnetic particles (BacMPs) that display the human estrogen receptor ligand binding domain (ERLBD) on their surfaces were successfully produced by the magnetotactic bacterium,Magnetospirillum magneticumAMB-1. A receptor assay for endocrine-disrupting chemicals using ERLBD-displaying BacMPs was developed. A BacMP membrane-specific protein, Mms16 or Mms13, was used as an anchor protein to localize the ERLBD on the surfaces of BacMPs. ERLBD-BacMP complexes were assayed for competitive binding of alkaline phosphatase-conjugated 17β-estradiol (ALP-E2). Inhibition curve of ALP-E2 to the powerful antagonist, tamoxifen was generated by measuring decreases in luminescence intensity that resulted from the enzymatic reaction of alkaline phosphatase. The overall simplicity of this receptor-binding assay results in a method that can be easily adapted to a high-throughput format.
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43
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Chen S, Yuan Y, Yao J, Han S, Gu R. Magnetic separation and immunoassay of multi-antigen based on surface enhanced Raman spectroscopy. Chem Commun (Camb) 2011; 47:4225-7. [DOI: 10.1039/c0cc05321j] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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44
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Baumgartner J, Faivre D. Magnetite biomineralization in bacteria. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2011; 52:3-27. [PMID: 21877261 DOI: 10.1007/978-3-642-21230-7_1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Magnetotactic bacteria are able to biomineralize magnetic crystals in intracellular organelles, so-called "magnetosomes." These particles exhibit species- and strain-specific size and morphology. They are of great interest for biomimetic nanotechnological and biotechnological research due to their fine-tuned magnetic properties and because they challenge our understanding of the classical principles of crystallization. Magnetotactic bacteria use these highly optimized particles, which form chains within the bacterial cells, as a magnetic field actuator, enabling them to navigate. In this chapter, we discuss the current biological and chemical knowledge of magnetite biomineralization in these bacteria. We highlight the extraordinary properties of magnetosomes and some resulting potential applications.
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Affiliation(s)
- Jens Baumgartner
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
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45
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Pimpha N, Chaleawlert-umpon S, Chruewkamlow N, Kasinrerk W. Preparation of anti-CD4 monoclonal antibody-conjugated magnetic poly(glycidyl methacrylate) particles and their application on CD4+ lymphocyte separation. Talanta 2010; 84:89-97. [PMID: 21315903 DOI: 10.1016/j.talanta.2010.12.032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 12/13/2010] [Accepted: 12/17/2010] [Indexed: 11/27/2022]
Abstract
Novel immunomagnetic particles have been prepared for separation of CD4(+) lymphocytes. The magnetic nanoparticles with a diameter of approximately 5-6 nm were first synthesized by co-precipitation from ferrous and ferric iron solutions and subsequently encapsulated with poly(glycidyl methacrylate) (PGMA) by precipitation polymerization. Monoclonal antibody specific to CD4 molecules expressed on CD4(+) lymphocytes was conjugated to the surface of magnetic PGMA particles through covalent bonding between epoxide functional groups on the particle surface and primary amine groups of the antibodies. The generated immunomagnetic particles have successfully separated CD4(+) lymphocytes from whole blood with over 95% purity. The results indicated that these particles can be employed for cell separation and provide a strong potential to be applied in various biomedical applications including diagnosis, and monitoring of human diseases.
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Affiliation(s)
- Nuttaporn Pimpha
- National Nanotechnology Center, National Science and Technology Development Agency, 113 Thailand Science Park, Paholyothin Rd., Pathumthani 12120, Thailand.
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46
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Tennico YH, Remcho VT. In-line extraction employing functionalized magnetic particles for capillary and microchip electrophoresis. Electrophoresis 2010; 31:2548-57. [PMID: 20665915 DOI: 10.1002/elps.201000256] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An approach to performing in-line extraction employing functionalized magnetic particles for CE and microchip electrophoresis is presented. Silica-coated iron oxide particles were synthesized and used as the solid support. The particles were functionalized with octadecylsilane and used as reverse-phase sorbents for in-line SPE followed by electrophoresis. Magnets were used to locally immobilize these sorbents inside the capillary or microchip. Extraction, elution, and detection of the analytes were performed sequentially without interruption or need for sample handling. Mixtures of hydrophobic analytes were successfully extracted from solution using the synthesized magnetic sorbents. CE was able to extract and separate mixture of parabens within 10 min. In-line extraction was also carried out on a disposable PMMA microfluidic device with LIF detection. Electrophoretic separation of fluorescent dyes, Rhodamine 110 and SulfoRhodamine B, was completed in under a minute. The results demonstrated the feasibility of performing the in-line extraction/separation technique in a microchip platform enabling rapid analysis, low sorbent consumption, and increased analyte recovery (relative to the capillary format).
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Affiliation(s)
- Yolanda H Tennico
- Department of Chemistry, Oregon State University, Corvallis, OR 97331, USA
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47
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Magnetic solids in analytical chemistry: A review. Anal Chim Acta 2010; 674:157-65. [DOI: 10.1016/j.aca.2010.06.043] [Citation(s) in RCA: 346] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 06/24/2010] [Accepted: 06/25/2010] [Indexed: 12/21/2022]
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48
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Controlled preparation of Fe3O4/P (St-MA) magnetic composite microspheres by DPE method. JOURNAL OF POLYMER RESEARCH 2010. [DOI: 10.1007/s10965-010-9471-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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49
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Yang X, Guo Y, Wang A. Luminol/antibody labeled gold nanoparticles for chemiluminescence immunoassay of carcinoembryonic antigen. Anal Chim Acta 2010; 666:91-6. [DOI: 10.1016/j.aca.2010.03.059] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Revised: 03/27/2010] [Accepted: 03/29/2010] [Indexed: 11/17/2022]
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50
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Yang C, Shao Q, He J, Jiang B. Preparation of monodisperse magnetic polymer microspheres by swelling and thermolysis technique. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5179-5183. [PMID: 19908847 DOI: 10.1021/la903659z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A novel process for the preparation of monodisperse magnetic polymer microspheres by uniquely combining swelling and thermolysis technique was reported. The monodisperse polystyrene microspheres were first prepared by dispersion polymerization and swelled in chloroform. Then, ferric oleate was dispersed in chloroform as a precursor and impregnated into the swollen polymer microspheres. Subsequently, the iron oxide nanoparticles were formed within the polymer matrix by thermal decomposition of ferric oleate. The morphology, inner structure, and magnetic properties of the magnetic polymer microspheres were studied with a field emission scanning electron microscope (SEM), transmission electron microscope (TEM), and superconducting quantum interference device (SQUID) magnetometer. The results showed that the average diameter of the magnetic polymer microspheres was 5.1 microm with a standard deviation of 0.106, and the magnetic polymer microspheres with saturation magnetization of 12.6 emu/g exhibited distinct superparamagnetic characteristics at room temperature. More interestingly, the magnetite nanoparticles with a spinel structure are evenly distributed over the whole area of the polymer microspheres. These magnetic polymer microspheres have potential applications in biotechnology.
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Affiliation(s)
- Chengli Yang
- Nano-Micro Materials Research Center, Key Laboratory of Chemical Genomics, School of Chemical Biology & Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China.
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