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Zhao Q, Niu P, Zhu G, Zhang C, Shen Z, Li M. Preparation, characterization and electrocatalytic performance of a novel poly(2,5-di(thienyl)pyrrole) modified electrode bearing TEMPO. J Electroanal Chem (Lausanne) 2023. [DOI: 10.1016/j.jelechem.2023.117407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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2
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Arroquia A, Acosta I, Armada MPG. Self-assembled gold decorated polydopamine nanospheres as electrochemical sensor for simultaneous determination of ascorbic acid, dopamine, uric acid and tryptophan. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 109:110602. [DOI: 10.1016/j.msec.2019.110602] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 12/02/2019] [Accepted: 12/23/2019] [Indexed: 01/14/2023]
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Augustine S, Kumar P, Malhotra BD. Amine-Functionalized MoO3@RGO Nanohybrid-Based Biosensor for Breast Cancer Detection. ACS APPLIED BIO MATERIALS 2019; 2:5366-5378. [DOI: 10.1021/acsabm.9b00659] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Shine Augustine
- Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042 India
| | - Pragati Kumar
- Administrative Supervisor, Department of Electrical Engineering, Delhi Technological University, Delhi, 110042 India
| | - Bansi D. Malhotra
- Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042 India
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4
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Pohanka M. QCM immunosensor for the determination of Staphylococcus aureus antigen. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00889-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Hashemipour S, Yaftian MR, Kalhor H, Ghanbari M. Investigation of bovine serum albumin/tropicamide interaction using a quartz crystal microbalance sensor. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1317-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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6
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Garyfallou GZ, Ketebu O, Şahin S, Mukaetova-Ladinska EB, Catt M, Yu EH. Electrochemical Detection of Plasma Immunoglobulin as a Biomarker for Alzheimer's Disease. SENSORS 2017; 17:s17112464. [PMID: 29077013 PMCID: PMC5713623 DOI: 10.3390/s17112464] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 10/20/2017] [Accepted: 10/20/2017] [Indexed: 12/24/2022]
Abstract
The clinical diagnosis and treatment of Alzheimer’s disease (AD) represent a challenge to clinicians due to the variability of clinical symptomatology as well as the unavailability of reliable diagnostic tests. In this study, the development of a novel electrochemical assay and its potential to detect peripheral blood biomarkers to diagnose AD using plasma immunoglobulins is investigated. The immunosensor employs a gold electrode as the immobilizing substrate, albumin depleted plasma immunoglobulin as the biomarker, and polyclonal rabbit Anti-human immunoglobulin (against IgA, IgG, IgM) as the receptor for plasma conjugation. The assay showed good response, sensitivity and reproducibility in differentiating plasma immunoglobulin from AD and control subjects down to 10−9 dilutions of plasma immunoglobulin representing plasma content concentrations in the pg mL−1 range. The newly developed assay is highly sensitive, less time consuming, easy to handle, can be easily modified to detect other dementia-related biomarkers in blood samples, and can be easily integrated into portable devices.
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Affiliation(s)
- Goulielmos-Zois Garyfallou
- School of Chemical Engineering and Advance Materials, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
| | - Orlando Ketebu
- School of Chemical Engineering and Advance Materials, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
| | - Samet Şahin
- School of Chemical Engineering and Advance Materials, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
- Department of Chemical and Process Engineering, Faculty of Engineering, Bilecik Şeyh Edebali University, 11230 Bilecik, Turkey.
| | | | - Michael Catt
- Institute of Neuroscience, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.
| | - Eileen Hao Yu
- School of Chemical Engineering and Advance Materials, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
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7
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Phal S, Lindholm-Sethson B, Geladi P, Shchukarev A, Tesfalidet S. Determination of methotrexate in spiked human blood serum using multi-frequency electrochemical immittance spectroscopy and multivariate data analysis. Anal Chim Acta 2017; 987:15-24. [PMID: 28916036 DOI: 10.1016/j.aca.2017.08.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 08/07/2017] [Accepted: 08/15/2017] [Indexed: 02/01/2023]
Abstract
This article describes an attempt to develop a sensor based on multi-frequency immittance spectroscopy for the determination of methotrexate (MTX) in blood serum using gold electrodes modified with antibodies. The attachment of antibodies was monitored with electrochemical immittance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The EIS measurements of MTX resulted in a data matrix of size 39 × 55. The data were analysed using multivariate data analysis and showed a concentration dependence and time dependence that could be separated. This allowed the calculation of a multivariate calibration model. The model showed good linear behavior on a logarithmic scale offering a detection limit of 5 × 10-12 mol L-1.
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Affiliation(s)
| | | | - Paul Geladi
- Corpus Data & Image Analysis AB, Rålambsvägen 66 B, Suit 1408, SE 112 56 Stockholm, Sweden
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8
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Mahmoudifard M, Vossoughi M, Soudi S, Soleimani M. Electrospun polyethersolfone nanofibrous membrane as novel platform for protein immobilization in microfluidic systems. J Biomed Mater Res B Appl Biomater 2017; 106:1108-1120. [PMID: 28503802 DOI: 10.1002/jbm.b.33923] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 04/04/2017] [Accepted: 04/29/2017] [Indexed: 11/07/2022]
Abstract
In the present study, the feasibility of electrospun polyethersolfone (PES) nanofibrous membrane as the solid substrate for microfluidic based immunoassays to enhance the density of immobilized antibody on the surface of membrane was assessed. Conversely, the efficacy of antibody immobilization was compared by two different strategies as 1-Ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC)/N-Hydroxysuccinimide (NHS) coupling chemistry and hydrophobic interaction. Compared to conventional immunoassays carried out in plates or gels, microfluidic based immunoassays grant a lot of advantages such as a consumption of little samples and reagents, shorter analysis time, and higher efficiency. Therefore, microfluidic immunoassays can be efficiently used as a point-of-care device in medical diagnosis. Surprisingly, we found the increase of specific surface areas of the microfluidic channels improve density of immobilized proteins and leads to higher signal strength. Anti-staphylococcus enterotoxin B (anti-SEB) was used as an analyte model to demonstrate the utility of our proposed platform. Fluorescent microscopy, Fourier transform infrared spectroscopic (FTIR), gas adsorption, contact angle, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Uv-Vis spectrophotometer and atomic force microscopy (AFM) techniques were used to assess the efficacy of antibody immobilization on the surface. To understand dominant mechanism of protein immobilization, zeta potential measurement was also carried out and it was found electrostatic attraction play significant role in antibody immobilization running into micro- channels containing through EDC/NHS. Moreover, incorporation of nanofibrous membrane causes significant improvement in the signal detection of microfluidic based immunoassay. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1108-1120, 2018.
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Affiliation(s)
- Matin Mahmoudifard
- Institute for nanoscience and nanotechnology, Sharif University of Technology, Tehran, Iran.,Nanotechnology and Tissue Engineering Department, Stem Cell Technology Research Center, Tehran, Iran
| | - Manouchehr Vossoughi
- Institute for nanoscience and nanotechnology, Sharif University of Technology, Tehran, Iran.,Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran
| | - Sara Soudi
- Department of immunology, Faculty of medical sciences, Tarbiat Modares University, Tehran, Iran
| | - Masoud Soleimani
- Department of Hematology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
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9
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Shi J, Sun X, Zhu J, Li J, Zhang H. One-step synthesis of amino-functionalized ultrasmall near infrared-emitting persistent luminescent nanoparticles for in vitro and in vivo bioimaging. NANOSCALE 2016; 8:9798-804. [PMID: 27120221 DOI: 10.1039/c6nr00590j] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Near infrared (NIR)-emitting persistent luminescent nanoparticles (NPLNPs) have attracted much attention in bioimaging because they can provide long-term in vivo imaging with a high signal-to-noise ratio (SNR). However, conventional NPLNPs with large particle sizes that lack modifiable surface groups suffer from many serious limitations in bioimaging. Herein, we report a one-step synthesis of amino-functionalized ZnGa2O4:Cr,Eu nanoparticles (ZGO) that have an ultrasmall size, where ethylenediamine served as the reactant to fabricate the ZGO as well as the surfactant ligand to control the nanocrystal size and form surface amino groups. The ZGO exhibited a narrow particle size distribution, a bright NIR emission and a long afterglow luminescence. In addition, due to the excellent conjugation ability of the surface amino groups, the ZGO can be easily conjugated with many bio-functional molecules, which has been successfully utilized to realize in vitro and in vivo imaging. More importantly, the ZGO achieved re-excitation imaging using 650 nm and 808 nm NIR light in situ, which is advantageous for long-term and higher SNR bioimaging.
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Affiliation(s)
- Junpeng Shi
- Key Lab of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China.
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10
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Yang L, Wang Z, Wang J, Jiang W, Jiang X, Bai Z, He Y, Jiang J, Wang D, Yang L. Doxorubicin conjugated functionalizable carbon dots for nucleus targeted delivery and enhanced therapeutic efficacy. NANOSCALE 2016; 8:6801-9. [PMID: 26957191 DOI: 10.1039/c6nr00247a] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Carbon dots (CDs) have shown great potential in imaging and drug/gene delivery applications. In this work, CDs functionalized with a nuclear localization signal peptide (NLS-CDs) were employed to transport doxorubicin (DOX) into cancer cells for enhanced antitumor activity. DOX was coupled to NLS-CDs (DOX-CDs) through an acid-labile hydrazone bond, which was cleavable in the weakly acidic intracellular compartments. The cytotoxicity of DOX-CD complexes was evaluated by the MTT assay and the cellular uptake was monitored using flow cytometry and confocal laser scanning microscopy. Cell imaging confirmed that DOX-CDs were mainly located in the nucleus. Furthermore, the complexes could efficiently induce apoptosis in human lung adenocarcinoma A549 cells. The in vivo therapeutic efficacy of DOX-CDs was investigated in an A549 xenograft nude mice model and the complexes exhibited an enhanced ability to inhibit tumor growth compared with free DOX. Thus, the DOX-CD conjugates may be exploited as promising drug delivery vehicles in cancer therapy.
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Affiliation(s)
- Lei Yang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Zheran Wang
- Department of Chemistry, University of the Cumberlands, 7000 College Station Drive, Williamsburg, KY 40769, USA
| | - Ju Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Weihua Jiang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Xuewei Jiang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Zhaoshi Bai
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Yunpeng He
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Jianqi Jiang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Dongkai Wang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Li Yang
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
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Wu H, Lin Q, Batchelor-McAuley C, Gonçalves LM, Lima CFRAC, Compton RG. Stochastic detection and characterisation of individual ferrocene derivative tagged graphene nanoplatelets. Analyst 2016; 141:2696-703. [DOI: 10.1039/c5an02550h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Graphene nanoplatelets (GNPs) are ‘tagged’ with 1-(biphen-4-yl)ferrocene, which has been studied via nano-impacts to derive the corresponding surface coverage.
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Affiliation(s)
- Haoyu Wu
- Department of Chemistry
- Physical and Theoretical Chemistry Laboratory
- University of Oxford
- Oxford OX1 3QZ
- UK
| | - Qianqi Lin
- Department of Chemistry
- Physical and Theoretical Chemistry Laboratory
- University of Oxford
- Oxford OX1 3QZ
- UK
| | | | - Luís Moreira Gonçalves
- LAQV-REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- 4169-007 Porto
- Portugal
| | - Carlos F. R. A. C. Lima
- CIQ
- Departamendo de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- 4169-007 Porto
- Portugal
| | - Richard G. Compton
- Department of Chemistry
- Physical and Theoretical Chemistry Laboratory
- University of Oxford
- Oxford OX1 3QZ
- UK
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Bastarrachea LJ, Goddard JM. Antimicrobial coatings with dual cationic and N-halamine character: characterization and biocidal efficacy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:4243-4251. [PMID: 25871333 DOI: 10.1021/acs.jafc.5b00445] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A method to prepare an antimicrobial coating for food-handling materials is reported. Alternating layers of branched polyethylenimine and styrene maleic anhydride copolymer were applied onto the surface of polypropylene. The resulting coatings had low surface energy and presented enhanced antimicrobial character due to the presence of both cationic and N-halamine forming structures. In its unchlorinated form, the coating inactivated Listeria monocytogenes by ∼3 logarithmic cycles. In the form of N-halamines >5 logarithmic cycles were reached. Microbial inactivation kinetics showed a Weibullian behavior when the coating was unchlorinated and a sigmoidal behavior when chlorinated. Microscopy confirmed that the reduction in the microbial load was due to biocidal effects of the coating and not bacterial adhesion onto the modified surface. The modified surface was able to be repeatedly rechlorinated. Such rechargeable antimicrobial coatings may support improving food safety by reducing cross-contamination of microorganisms from food-processing equipment.
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Affiliation(s)
- Luis J Bastarrachea
- Department of Food Science, University of Massachusetts, 102 Holdsworth Way, Amherst, Massachusetts 01003, United States
| | - Julie M Goddard
- Department of Food Science, University of Massachusetts, 102 Holdsworth Way, Amherst, Massachusetts 01003, United States
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13
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Li Y, He J, Xia C, Gao L, Yu C. Ultrasensitive electrochemical immunosensor based on orderly oriented conductive wires for the detection of human monocyte chemotactic protein-1 in serum. Biosens Bioelectron 2015; 70:392-7. [PMID: 25845330 DOI: 10.1016/j.bios.2015.03.071] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/26/2015] [Accepted: 03/27/2015] [Indexed: 12/12/2022]
Abstract
For the first time, a simple, ultrasensitive and label-free electrochemical monocyte chemotactic protein-1 (MCP-1) immunosensor based on orderly oriented conductive wires has been developed. A conductive wire, which is similar to an electron-conducting tunnel, was designed with Au nanoparticles (AuNPs) joined to Au@Pt core-shell microspheres via a cysteamine (CA) crosslinker. To enhance the sensitivity of the immunosensor, Au nanoparticles were electrodeposited onto the gold electrode, and CA was self-assembled via strong Au-S covalent bonds, providing an appropriate surface and promoting electron transfer. Next, Au@Pt core-shell microspheres with large surface area were grafted onto the modified electrode to immobilize more MCP-1 antibodies. MCP-1 is an initiating factor and biomarker of atherosclerotic diseases. Under optimal experimental conditions, differential pulse voltammetry (DPV) current changes were used to detect MCP-1 with a broad linear range of 0.09-360 pg mL(-1) and a low detection limit of 0.03 pg mL(-1) (S/N=3). The proposed immunosensor exhibited good selectivity, reproducibility and reusability. When applied to spiked serum samples, the data for the developed immunosensor were in agreement with an enzyme linked immunosorbent assay, suggesting that the electrochemical immunosensor would be suitable for practical detection.
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Affiliation(s)
- Yuliang Li
- Institute of Life Science and School of Public Health, Chongqing Medical University, Chongqing 400016, PR China
| | - Junlin He
- Institute of Life Science and School of Public Health, Chongqing Medical University, Chongqing 400016, PR China
| | - Chunyong Xia
- Institute of Life Science and School of Public Health, Chongqing Medical University, Chongqing 400016, PR China
| | - Liuliu Gao
- Institute of Life Science and School of Public Health, Chongqing Medical University, Chongqing 400016, PR China
| | - Chao Yu
- Institute of Life Science and School of Public Health, Chongqing Medical University, Chongqing 400016, PR China.
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Electrochemical immunosensor for prostate-specific antigens using a label-free second antibody based on silica nanoparticles and polymer brush. Bioelectrochemistry 2015; 101:75-83. [DOI: 10.1016/j.bioelechem.2014.08.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 08/04/2014] [Accepted: 08/05/2014] [Indexed: 01/19/2023]
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15
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Celikkol-Aydin S, Suo Z, Yang X, Ince B, Avci R. Sharp transition in the immunoimmobilization of E. coli O157:H7. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7755-7761. [PMID: 24911628 DOI: 10.1021/la501545n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This work focuses on immobilization of living enterohemorrhagic Escherichia coli O157:H7 on a gold surface as a function of the concentration of antibody tethered to the surface in the physiological environment of the organisms. Experiments are conducted using antibodies raised against bacterial surface lipopolysaccharides (LPS) tethered to gold-coated silicon wafers at surface concentrations spanning a range from submonolayers of antibodies to full coverage, an estimated 1 antibody per ∼100 nm(2). A careful optimization of surface chemistry is conducted to obtain the most efficient tethering of the antibodies to the surface. The mechanism of immobilizing the bacteria is antibody-antigen interactions between the tethered antibodies on the surface and the bacterial surface LPS firmly attached to the bacteria. This type of attachment is known as immunoimmobilization. The experiments suggest no noticeable bacterial attachment until the surface antibody concentration reaches ∼70% of a full monolayer of coverage. Above this critical antibody density, a sharp increase in immunoimmobilized bacteria is observed as they populate nearly 80% to 100% of the available surface area, reaching ∼1.2 cells/10 μm(2). This sharp increase in population is tentatively explained in terms of the minimum number of antibody-antigen interactions required per bacterium to immobilize the cell. This critical number is estimated to be ∼6000-8000 antibodies per bacterium (having a 1 μm(2) footprint on the surface) under the assumption that a full monolayer of antibodies is about 1 antibody per ∼100 nm(2). However, the large majority of the 6000-8000 antibodies are not expected to participate in antibody-antigen interactions, in that the loose LPS in solution will saturate many of these antibodies before bacteria have a chance to interact with them. Furthermore, the geometric considerations will further restrict the majority of the active antibodies from interacting with the surface antigens of the cell, reducing its effective contact area with the antibodies considerably.
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Affiliation(s)
- Sukriye Celikkol-Aydin
- Institute of Environmental Sciences, Bogazici University , Bebek, Istanbul 34342, Turkey
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Bastarrachea LJ, McLandsborough LA, Peleg M, Goddard JM. Antimicrobial N-halamine modified polyethylene: characterization, biocidal efficacy, regeneration, and stability. J Food Sci 2014; 79:E887-97. [PMID: 24754818 DOI: 10.1111/1750-3841.12455] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 03/11/2014] [Indexed: 11/27/2022]
Abstract
UNLABELLED Development of antimicrobial materials that regenerate antimicrobial activity represents a novel technology in preventing microbial cross-contamination. We report a method for the application of regenerably antimicrobial N-halamines onto the surface of polyethylene (PE) materials through layer-by-layer (LbL) assembly of polyethyleneimine and poly(acrylic acid). A total of 5, 10, 15, and 20 bilayers were applied. Modified PE had from 49.3 to 293.5 nmol cm(-2) antimicrobial N-halamines from 5 to 20 bilayers after 10 min of chlorination. Each variant of N-halamine modified PE was able to reduce by >5 logarithmic cycles Listeria monocytogenes. The stability of N-halamine modified PE was characterized after extended exposure to chlorine, acidic solutions, and an alkaline cleaner. After an initial conditioning period, materials generated more than double the quantity of N-halamines present on as prepared materials, retaining regenerability for up to 100 chlorination cycles. After the equivalent of 300 washing cycles by buffers (pH values 3, 5, and 7) or a commercial alkaline detergent, there was no change in the number of antimicrobial N-halamines on the modified materials. These results indicate that the reported LbL deposition technique results in antimicrobial N-halamine materials capable of long-term reuse and exposure to harsh chemicals as expected in a food-processing environment. Such robust, regenerably antimicrobial materials could be an effective technology in the food industry to prevent cross-contamination of pathogenic and spoilage microorganisms. PRACTICAL APPLICATION The food contact surface of polyethylene was modified by layer-by-layer deposition of 2 polymers, resulting in a rechargeably antimicrobial surface. Repeated exposure to chlorine regenerated its antimicrobial activity, resulting in greater than 99.999% reduction in Listeria monocytogenes. Materials were stable against repeated washing and exposure to acidic environments. These food contact materials could support current cleaning and sanitization protocols in improving food safety in the processing environment.
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Affiliation(s)
- Luis J Bastarrachea
- Dept. of Food Science, Univ. of Massachusetts, 102 Holdsworth way, Amherst, MA 01003, USA
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Gutierrez L, Nguyen TH. Interactions between rotavirus and natural organic matter isolates with different physicochemical characteristics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14460-8. [PMID: 24152034 DOI: 10.1021/la402893b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Interaction forces between rotavirus and Suwanee River natural organic matter (SRNOM) or Colorado River NOM (CRNOM) were studied by atomic force microscopy (AFM) in NaCl solutions and at unadjusted pH (5.7-5.9). Compared to CRNOM, SRNOM has more aromatic carbon and phenolic/carboxylic functional groups. CRNOM is characterized with aliphatic structure and considerable presence of polysaccharide moieties rich in hydroxyl functional groups. Strong repulsive forces were observed between rotavirus and silica or mica or SRNOM. The interaction decay length derived from the approaching curves for these systems involving rotavirus in high ionic strength solution was significantly higher than the theoretical Debye length. While no adhesion was observed for rotavirus and SRNOM, attraction was observed between CRNOM and rotavirus during approach and adhesion during retraction. Moreover, these adhesion forces decreased with increasing ionic strength. Interactions due to ionic hydrogen bonding between deprotonated carboxyl groups on rotavirus and hydroxyl functional groups on CRNOM were suggested as the dominant interaction mechanisms between rotavirus and CRNOM.
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Affiliation(s)
- Leonardo Gutierrez
- Department of Civil and Environmental Engineering, Safe Global Water Institute, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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Morán-Quiroz JL, Orozco-Guareño E, Manríquez R, Carbajal-Arízaga GG, de la Cruz W, Gomez-Salazar S. Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions. J Appl Polym Sci 2013. [DOI: 10.1002/app.39933] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- José Luis Morán-Quiroz
- Departamento de Química; Centro Universitario de Ciencias Exactas e Ingenierías; Universidad de Guadalajara; Blvd. Marcelino García Barragán 1451. Guadalajara Jalisco México
| | - Eulogio Orozco-Guareño
- Departamento de Química; Centro Universitario de Ciencias Exactas e Ingenierías; Universidad de Guadalajara; Blvd. Marcelino García Barragán 1451. Guadalajara Jalisco México
| | - Ricardo Manríquez
- Departamento de Madera; Celulosa y Papel, Centro Universitario de Ciencias Exactas e Ingenierías; Universidad de Guadalajara; Km 15.5 Carretera Guadalajara-Nogales Guadalajara Jalisco 45020 México
| | - Gregorio G. Carbajal-Arízaga
- Departamento de Química; Centro Universitario de Ciencias Exactas e Ingenierías; Universidad de Guadalajara; Blvd. Marcelino García Barragán 1451. Guadalajara Jalisco México
| | - Wencel de la Cruz
- Centro de Nanociencias y Nanotecnología; Universidad Nacional Autónoma de México; Km 107 Carretera Tijuana-Ensenada Ensenada Baja California 22830 México
| | - Sergio Gomez-Salazar
- Departamento de Ingeniería Química; Centro Universitario de Ciencias Exactas e Ingenierías; Universidad de Guadalajara; Blvd. Marcelino García Barragán 1451. Guadalajara Jalisco México
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Li HY, Tseng SH, Cheng TM, Chu HL, Lu YN, Wang FY, Tsai LY, Shieh JY, Yang JY, Juan CC, Tu LC, Chang CC. Rapid and highly sensitive detection of Enterovirus 71 by using nanogold-enhanced electrochemical impedance spectroscopy. NANOTECHNOLOGY 2013; 24:285102. [PMID: 23787733 DOI: 10.1088/0957-4484/24/28/285102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Enterovirus 71 (EV71) infection is an emerging infectious disease causing neurological complications and/or death within two to three days after the development of fever and rash. A low viral titre in clinical specimens makes the detection of EV71 difficult. Conventional approaches for detecting EV71 are time consuming, poorly sensitive, or complicated, and cannot be used effectively for clinical diagnosis. Furthermore, EV71 and Coxsackie virus A16 (CA16) may cross react in conventional assays. Therefore, a rapid, highly sensitive, specific, and user-friendly test is needed. We developed an EV71-specific nanogold-modified working electrode for electrochemical impedance spectroscopy in the detection of EV71. Our results show that EV71 can be distinguished from CA16, Herpes simplex virus, and lysozyme, with the modified nanogold electrode being able to detect EV71 in concentrations as low as 1 copy number/50 μl reaction volume, and the duration between sample preparation and detection being 11 min. This detection platform may have the potential for use in point-of-care diagnostics.
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Affiliation(s)
- Hsing-Yuan Li
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
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20
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Yang L, Zhu Z, Yu XY, Rodek E, Saraf L, Thevuthasan T, Cowin JP. In situ
SEM and ToF-SIMS analysis of IgG conjugated gold nanoparticles at aqueous surfaces. SURF INTERFACE ANAL 2013. [DOI: 10.1002/sia.5252] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Li Yang
- Chemical and Materials Sciences Division; Pacific Northwest National Laboratory; Richland WA 99354 USA
- Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory; Richland WA 99354 USA
| | - Zihua Zhu
- Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory; Richland WA 99354 USA
| | - Xiao-Ying Yu
- Atmospheric Sciences and Global Climate Change Division; Pacific Northwest National Laboratory; Richland WA 99354 USA
| | - Eugene Rodek
- SPI Supplies/Structure Probe, Inc.; West Chester PA 19380
| | - Lax Saraf
- Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory; Richland WA 99354 USA
| | - Theva Thevuthasan
- Environmental Molecular Sciences Laboratory; Pacific Northwest National Laboratory; Richland WA 99354 USA
| | - James P. Cowin
- Chemical and Materials Sciences Division; Pacific Northwest National Laboratory; Richland WA 99354 USA
- Cowin In-Situ Science, L. L. C., Richland; WA 99354 USA
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21
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Azzazy HM, Mansour MM, Samir TM, Franco R. Gold nanoparticles in the clinical laboratory: principles of preparation and applications. ACTA ACUST UNITED AC 2012; 50:193-209. [DOI: 10.1515/cclm.2011.732] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2011] [Accepted: 08/28/2011] [Indexed: 12/20/2022]
Abstract
AbstractIn order to meet the challenges of effective healthcare, the clinical laboratory is constantly striving to improve testing sensitivity while reducing the required time and cost. Gold nanoparticles (AuNPs) are proposed as one of the most promising tools to meet such goals. They have unique optophysical properties which enable sensitive detection of biomarkers, and are easily amenable to modification for use in different assay formats including immunoassays and molecular assays. Additionally, their preparation is relatively simple and their detection methods are quite versatile. AuNPs are showing substantial promise for effective practical applications and commercial utilization is already underway. This article covers the principles of preparation of AuNPs and their use for development of different diagnostic platforms.
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22
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Zhou YG, Rees NV, Compton RG. The electrochemical detection of tagged nanoparticles via particle-electrode collisions: nanoelectroanalysis beyond immobilisation. Chem Commun (Camb) 2012; 48:2510-2. [DOI: 10.1039/c2cc17481b] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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23
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Kondratiev VV, Pogulaichenko NA, Hui S, Tolstopjatova EG, Malev VV. Electroless deposition of gold into poly-3,4-ethylenedioxythiophene films and their characterization performed in chloride-containing solutions. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1518-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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He L, Lin D, Wang Y, Xiao Y, Che J. Electroactive SWNT/PEGDA hybrid hydrogel coating for bio-electrode interface. Colloids Surf B Biointerfaces 2011; 87:273-9. [PMID: 21676598 DOI: 10.1016/j.colsurfb.2011.05.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 05/16/2011] [Accepted: 05/17/2011] [Indexed: 12/23/2022]
Abstract
Electric interface between neural tissue and electrode plays a significant role in the development of implanted devices for continuous monitoring and functional stimulation of central nervous system in terms of electroactivity, biocompatibility and long-term stability. To engineer an interface that possesses these merits, a polymeric hydrogel based on poly(ethylene glycol) diacrylate (PEGDA) and single-walled carbon nanotubes (SWNTs) were employed to fabricate a hybrid hydrogel via covalent anchoring strategy, i.e., self-assembly of cysteamine (Cys) followed by Michael addition between Cys and PEGDA. XPS characterization proves that the Cys molecules are linked to gold surface via the strong S-Au bond and that the PEGDA macromers are covalently bonded to Cys. FTIR spectra indicate the formation of hybrid hydrogel coating during photopolymerization. Electrochemical measurements using cyclic voltammetry (CV) and impedance spectrum clearly show the enhancement of electric properties to the hydrogel by the SWNTs. The charge transfer of the hybrid hydrogel-based electrode is quasi-reversible and charge transfer resistance decreases to the tenth of that of the pure hydrogel due to electron hopping along the SWNTs. Additionally, this hybrid hydrogel provides a favorable biomimetic microenvironment for cell attachment and growth due to its inherent biocompatibility. Combination of these merits yields hybrid hydrogels that can be good candidates for application to biosensors and biomedical devices. More importantly, the hybrid hydrogel coatings fabricated via the current strategy have good adhesion to the electrode substrate which is highly desired for chronically implantable devices.
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Affiliation(s)
- Lei He
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, China
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25
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Baptista PV, Doria G, Quaresma P, Cavadas M, Neves CS, Gomes I, Eaton P, Pereira E, Franco R. Nanoparticles in molecular diagnostics. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2011; 104:427-88. [PMID: 22093226 DOI: 10.1016/b978-0-12-416020-0.00011-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The aim of this chapter is to provide an overview of the available and emerging molecular diagnostic methods that take advantage of the unique nanoscale properties of nanoparticles (NPs) to increase the sensitivity, detection capabilities, ease of operation, and portability of the biodetection assemblies. The focus will be on noble metal NPs, especially gold NPs, fluorescent NPs, especially quantum dots, and magnetic NPs, the three main players in the development of probes for biological sensing. The chapter is divided into four sections: a first section covering the unique physicochemical properties of NPs of relevance for their utilization in molecular diagnostics; the second section dedicated to applications of NPs in molecular diagnostics by nucleic acid detection; and the third section with major applications of NPs in the area of immunoassays. Finally, a concluding section highlights the most promising advances in the area and presents future perspectives.
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Affiliation(s)
- Pedro V Baptista
- Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Centro de Investigação em Genética Molecular Humana (CIGMH), Universidade Nova de Lisboa, Caparica, Portugal
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26
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Mazloum-Ardakani M, Beitollahi H, Mohseni MAS, Benvidi A, Naeimi H, Nejati-Barzoki M, Taghavinia N. Simultaneous determination of epinephrine and acetaminophen concentrations using a novel carbon paste electrode prepared with 2,2′-[1,2 butanediylbis(nitriloethylidyne)]-bis-hydroquinone and TiO2 nanoparticles. Colloids Surf B Biointerfaces 2010; 76:82-7. [DOI: 10.1016/j.colsurfb.2009.10.019] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Revised: 10/05/2009] [Accepted: 10/09/2009] [Indexed: 10/20/2022]
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27
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Yang M, Kostov Y, Bruck HA, Rasooly A. Gold nanoparticle-based enhanced chemiluminescence immunosensor for detection of Staphylococcal Enterotoxin B (SEB) in food. Int J Food Microbiol 2009; 133:265-71. [PMID: 19540011 DOI: 10.1016/j.ijfoodmicro.2009.05.029] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 05/26/2009] [Accepted: 05/27/2009] [Indexed: 10/20/2022]
Abstract
Staphylococcal enterotoxins (SEs) are major cause of foodborne diseases, so sensitive detection (<1 ng/ml) methods are needed for SE detection in food. The surface area, geometric and physical properties of gold nanoparticles make them well-suited for enhancing interactions with biological molecules in assays. To take advantage of the properties of gold nanoparticles for immunodetection, we have developed a gold nanoparticle-based enhanced chemiluminescence (ECL) immunosensor for detection of Staphylococcal Enterotoxin B (SEB) in food. Anti-SEB primary antibodies were immobilized onto a gold nanoparticle surface through physical adsorption and then the antibody-gold nanoparticle mixture was immobilized onto a polycarbonate surface. SEB was detected by a "sandwich-type" ELISA assay on the polycarbonate surface with a secondary antibody and ECL detection. The signal from ECL was read using a point-of-care detector based on a cooled charge-coupled device (CCD) sensor or a plate reader. The system was used to test for SEB in buffer and various foods (mushrooms, tomatoes, and baby food meat). The limit of detection was found to be approximately 0.01 ng/mL, which is approximately 10 times more sensitive than traditional ELISA. The gold nanoparticles were relatively easy to use for antibody immobilization because of their physical adsorption mechanism; no other reagents were required for immobilization. The use of our simple and inexpensive detector combined with the gold nanoparticle-based ECL method described here is adaptable to simplify and increase sensitivity of any immunological assay and for point-of-care diagnostics.
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Affiliation(s)
- Minghui Yang
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, MD 21250, USA
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