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Lin TE, Darvishi S. A Brief Review of In Situ and Operando Electrochemical Analysis of Bacteria by Scanning Probes. BIOSENSORS 2023; 13:695. [PMID: 37504094 PMCID: PMC10377567 DOI: 10.3390/bios13070695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 06/23/2023] [Accepted: 06/28/2023] [Indexed: 07/29/2023]
Abstract
Bacteria are similar to social organisms that engage in critical interactions with one another, forming spatially structured communities. Despite extensive research on the composition, structure, and communication of bacteria, the mechanisms behind their interactions and biofilm formation are not yet fully understood. To address this issue, scanning probe techniques such as atomic force microscopy (AFM), scanning electrochemical microscopy (SECM), scanning electrochemical cell microscopy (SECCM), and scanning ion-conductance microscopy (SICM) have been utilized to analyze bacteria. This review article focuses on summarizing the use of electrochemical scanning probes for investigating bacteria, including analysis of electroactive metabolites, enzymes, oxygen consumption, ion concentrations, pH values, biofilms, and quorum sensing molecules to provide a better understanding of bacterial interactions and communication. SECM has been combined with other techniques, such as AFM, inverted optical microscopy, SICM, and fluorescence microscopy. This allows a comprehensive study of the surfaces of bacteria while also providing more information on their metabolic activity. In general, the use of scanning probes for the detection of bacteria has shown great promise and has the potential to provide a powerful tool for the study of bacterial physiology and the detection of bacterial infections.
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Affiliation(s)
- Tzu-En Lin
- Institute of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
| | - Sorour Darvishi
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
- Berkeley Sensor and Actuator Center, University of California, Berkeley, CA 94720, USA
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Lin YH, Tsai CN, Chen PF, Lin YT, Darvishi S, Girault HH, Lin TY, Liao MY, Lin TE. AI-Assisted Fusion of Scanning Electrochemical Microscopy Images Using Novel Soft Probe. ACS MEASUREMENT SCIENCE AU 2022; 2:576-583. [PMID: 36785775 PMCID: PMC9885998 DOI: 10.1021/acsmeasuresciau.2c00032] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 08/01/2022] [Accepted: 08/02/2022] [Indexed: 06/18/2023]
Abstract
Scanning electrochemical microscopy (SECM) is one of the scanning probe techniques that has attracted considerable attention because of its ability to interrogate surface morphology or electrochemical reactivity. However, the quality of SECM images generally depends on the sizes of the electrodes and many uncontrollable factors. Furthermore, manipulating fragile glass ultramicroelectrodes and blurred images sometimes frustrate researchers. To overcome the challenges of modern SECM, we developed novel soft gold probes and then established the AI-assisted methodology for image fusion. A novel gold microelectrode probe with high softness was developed to scan fragile samples. The distribution of EGFR (protein biomarker) in oral cancer was investigated. Then, we fused the optical microscopic and SECM images to enhance the image quality using Matlab software. However, thousands of fused images were generated by changing the parameters for image fusion, which is annoying for researchers. Thus, a deep learning model was built to select the best-fused images according to the contrast and clarity of the fused images. Therefore, the quality of the SECM images was improved using a novel soft probe and combining the image fusion technique. In the future, a new scanning probe with AI-assisted fused SECM image processing may be interpreted more preciously and contribute to the early detection of cancers.
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Affiliation(s)
- Yi-Hong Lin
- Institute
of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 30010 Hsinchu, Taiwan
| | - Chih-Ning Tsai
- Institute
of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 30010 Hsinchu, Taiwan
| | - Po-Feng Chen
- Institute
of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 30010 Hsinchu, Taiwan
| | - Yen-Tzu Lin
- Institute
of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 30010 Hsinchu, Taiwan
| | - Sorour Darvishi
- Department
of Chemistry and Chemical Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), Valais Wallis, CH-1950 Sion, Switzerland
| | - Hubert H. Girault
- Department
of Chemistry and Chemical Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), Valais Wallis, CH-1950 Sion, Switzerland
| | - Tung-Yi Lin
- Institute
of Traditional Medicine, National Yang Ming
Chiao Tung University, Taipei 11221, Taiwan
- Biomedical
Industry Ph.D. Program, National Yang Ming
Chiao Tung University, Taipei 11221, Taiwan
| | - Mei-Yi Liao
- Department
of Applied Chemistry, National Pingtung
University, Pingtung 90003, Taiwan
| | - Tzu-En Lin
- Institute
of Biomedical Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, 30010 Hsinchu, Taiwan
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Chen H, Kong X, Wang D, Zhang M. Flexible Disk Ultramicroelectrode for High-Resolution and Substrate-Tolerable Scanning Electrochemical Microscopy Imaging. Anal Chem 2022; 94:17320-17327. [PMID: 36448925 DOI: 10.1021/acs.analchem.2c04465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
A simple and universal strategy for fabricating flexible 25 μm platinum (Pt) disk ultramicroelectrodes (UMEs) was proposed, where a pulled borosilicate glass micropipette acted as a mold for shaping the flexible tip with flexible epoxy resin. The whole preparation procedure was highly efficient, enabling 10 or more probes to be manually fabricated within 10 h. Intriguingly, this technique permits an adjustable RG ratio, tip length, and stiffness, which could be tuned according to varying experimental demands. Besides, the electroactive area of the probe could be exposed and made renewable with a thin blade, allowing its reuse in multiple experiments. The flexibility characterization was then employed to optimize the resin/hardener mass ratio of epoxy resin and the tip position during HF etching in the fabrication process, suggesting that more hardener, a larger RG value, or a longer tip length obtained stronger deformation resistance. Subsequently, the as-prepared probe was examined by optical microscopy, cyclic voltammetry, and SECM approach curves. The results demonstrated the probe possessed good geometry with a small RG ratio of less than 3 and exceptional electrochemical properties, and its insulating sheath remained undeformed after blade cutting. Owing to the tip's flexibility, it could be operated in contactless mode with an extremely low working distance and even in contact mode scanning to achieve high spatial resolution and high sensitivity while guaranteeing that the tip and samples would suffer minimal damage if the tip crashed. Finally, the flexible probe was successfully employed in three scanning scenarios where tilted and 3D structured PDMS microchips, a latent fingerprint deposited on the stiff copper sheet, and soft egg white were included. In all, the flexible probe encompasses the advantages of traditional disk UMEs and circumvents their principal drawbacks of tip crash and causing sample scratches, which is thus more compatible with large specimens of 3D structured, stiff, or even soft topography.
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Affiliation(s)
- Hongyu Chen
- Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing100083, China
| | - Xiangyi Kong
- Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing100083, China
| | - Dongrui Wang
- Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing100083, China
| | - Meiqin Zhang
- Beijing Key Laboratory for Bioengineering and Sensing Technology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing100083, China
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Scanning gel electrochemical microscopy: Combination with quartz crystal microbalance for studying the electrolyte residue. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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A Review: Scanning Electrochemical Microscopy (SECM) for Visualizing the Real-Time Local Catalytic Activity. Catalysts 2021. [DOI: 10.3390/catal11050594] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Scanning electrochemical microscopy (SECM) is a powerful scanning probe technique for measuring the in situ electrochemical reactions occurring at various sample interfaces, such as the liquid-liquid, solid-liquid, and liquid-gas. The tip/probe of SECM is usually an ultramicroelectrode (UME) or a nanoelectrode that can move towards or over the sample of interest controlled by a precise motor positioning system. Remarkably, electrocatalysts play a crucial role in addressing the surge in global energy consumption by providing sustainable alternative energy sources. Therefore, the precise measurement of catalytic reactions offers profound insights for designing novel catalysts as well as for enhancing their performance. SECM proves to be an excellent tool for characterization and screening catalysts as the probe can rapidly scan along one direction over the sample array containing a large number of different compositions. These features make SECM more appealing than other conventional methodologies for assessing bulk solutions. SECM can be employed for investigating numerous catalytic reactions including the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), water oxidation, glucose oxidation reaction (GOR), and CO2 reduction reaction (CO2RR) with high spatial resolution. Moreover, for improving the catalyst design, several SECM modes can be applied based on the catalytic reactions under evaluation. This review aims to present a brief overview of the recent applications of electrocatalysts and their kinetics as well as catalytic sites in electrochemical reactions, such as oxygen reduction, water oxidation, and methanol oxidation.
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Guiné RPF, De Lemos ET. Development of New Dairy Products with Functional Ingredients. JOURNAL OF CULINARY SCIENCE & TECHNOLOGY 2018. [DOI: 10.1080/15428052.2018.1552901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Raquel P. F. Guiné
- CI&DETS Research Centre and Department of Food Industry, Polytechnic Institute of Viseu, Viseu, Portugal
| | - Edite Teixeira De Lemos
- CI&DETS Research Centre and Department of Food Industry, Polytechnic Institute of Viseu, Viseu, Portugal
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Conzuelo F, Schulte A, Schuhmann W. Biological imaging with scanning electrochemical microscopy. Proc Math Phys Eng Sci 2018; 474:20180409. [PMID: 30839832 PMCID: PMC6237495 DOI: 10.1098/rspa.2018.0409] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 09/04/2018] [Indexed: 12/27/2022] Open
Abstract
Scanning electrochemical microscopy (SECM) is a powerful and versatile technique for visualizing the local electrochemical activity of a surface as an ultramicroelectrode tip is moved towards or over a sample of interest using precise positioning systems. In comparison with other scanning probe techniques, SECM not only enables topographical surface mapping but also gathers chemical information with high spatial resolution. Considerable progress has been made in the analysis of biological samples, including living cells and immobilized biomacromolecules such as enzymes, antibodies and DNA fragments. Moreover, combinations of SECM with comple-mentary analytical tools broadened its applicability and facilitated multi-functional analysis with extended life science capabilities. The aim of this review is to present a brief topical overview on recent applications of biological SECM, with particular emphasis on important technical improvements of this surface imaging technique, recommended applications and future trends.
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Affiliation(s)
- Felipe Conzuelo
- Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty for Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
| | - Albert Schulte
- School of Biomolecular Science and Engineering (BSE), Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Wolfgang Schuhmann
- Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty for Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
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Ge Y, Wei M, Li C, Chen Y, Lv J, Meng K, Wang W, Li J. Reactive oxygen species metabolism and phenylpropanoid pathway involved in disease resistance against Penicillium expansum in apple fruit induced by ϵ-poly-l-lysine. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:5082-5088. [PMID: 29604076 DOI: 10.1002/jsfa.9046] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 03/10/2018] [Accepted: 03/27/2018] [Indexed: 05/13/2023]
Abstract
BACKGROUND Blue mould caused by Penicillium expansum comprises a notable disease of apple fruit during storage. ϵ-Poly-l-lysine (PL) consists of ϵ-amino and α-hydroxyl and has been used in food preservation. In the present study, apple fruits (cv. Fuji) were used to investigate the effects of PL dipping treatment, at different concentrations of PL, on the lesion diameter of fruit inoculated with P. expansum, aiming to screen the optimal concentration for controlling blue mould. The effects of PL at the optimal concentration on reactive oxygen species (ROS) metabolism and the phenylpropanoid pathway were also investigated. RESULTS The results indicated that 25, 50, 100 and 200 µL L-1 PL treatment significantly decreased the lesion diameter in apple fruit inoculated with P. expansum and the smallest lesion diameter was determined for 50 µL L-1 PL-treated fruits. The results also indicated that 50 µL L-1 PL treatment increased the hydrogen peroxide content and the activities of enzymes involved in ROS metabolism, including superoxide dismutase, catalase, ascorbate peroxidase, glutathione reductase and peroxidase in apple fruit. The activity of phenylalanine ammonia-lyase and the contents of lignin, total phenolic compounds and flavonoids were also enhanced by PL treatment. CONCLUSION The disease resistance to P. expansum in apple fruits enhanced by PL treatment is related to activating ROS metabolism and the phenylpropanoid pathway and the accumulation of antifungal compounds. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Yonghong Ge
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Meilin Wei
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Canying Li
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Yanru Chen
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Jingyi Lv
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Kun Meng
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
| | - Wenhui Wang
- Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng, China
| | - Jianrong Li
- College of Food Science and Technology, Bohai University, Food Safety Key Laboratory of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, China
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9
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Advances and Perspectives in Chemical Imaging in Cellular Environments Using Electrochemical Methods. CHEMOSENSORS 2018. [DOI: 10.3390/chemosensors6020024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Lin TE, Rapino S, Girault HH, Lesch A. Electrochemical imaging of cells and tissues. Chem Sci 2018; 9:4546-4554. [PMID: 29899947 PMCID: PMC5969511 DOI: 10.1039/c8sc01035h] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 04/09/2018] [Indexed: 01/10/2023] Open
Abstract
This minireview summarizes the recent achievements of electrochemical imaging platforms to map cellular functions in biological specimens using electrochemical scanning nano/micro-probe microscopy and 2D chips containing microelectrode arrays.
The technological and experimental progress in electrochemical imaging of biological specimens is discussed with a view on potential applications for skin cancer diagnostics, reproductive medicine and microbial testing. The electrochemical analysis of single cell activity inside cell cultures, 3D cellular aggregates and microtissues is based on the selective detection of electroactive species involved in biological functions. Electrochemical imaging strategies, based on nano/micrometric probes scanning over the sample and sensor array chips, respectively, can be made sensitive and selective without being affected by optical interference as many other microscopy techniques. The recent developments in microfabrication, electronics and cell culturing/tissue engineering have evolved in affordable and fast-sampling electrochemical imaging platforms. We believe that the topics discussed herein demonstrate the applicability of electrochemical imaging devices in many areas related to cellular functions.
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Affiliation(s)
- Tzu-En Lin
- Laboratory of Physical and Analytical Electrochemistry (LEPA) , École Polytechnique Fédéderale de Lausanne , EPFL Valais Valais , Rue de l'Industrie 17 , CP 440 , 1951 Sion , Switzerland .
| | - Stefania Rapino
- Chemistry Department "Giacomo Ciamician" , University of Bologna , Via Selmi 2 , 40126 Bologna , Italy
| | - Hubert H Girault
- Laboratory of Physical and Analytical Electrochemistry (LEPA) , École Polytechnique Fédéderale de Lausanne , EPFL Valais Valais , Rue de l'Industrie 17 , CP 440 , 1951 Sion , Switzerland .
| | - Andreas Lesch
- Laboratory of Physical and Analytical Electrochemistry (LEPA) , École Polytechnique Fédéderale de Lausanne , EPFL Valais Valais , Rue de l'Industrie 17 , CP 440 , 1951 Sion , Switzerland .
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Lin TE, Lu YJ, Sun CL, Pick H, Chen JP, Lesch A, Girault HH. Weiche elektrochemische Sonden zum Abbilden der Verteilung von Biomarkern und injizierten Nanomaterialien in tierischem und menschlichem Gewebe. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tzu-En Lin
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sitten Schweiz
| | - Yu-Jen Lu
- Department of Neurosurgery; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
- Chang Gung University College of Medicine; Guishan Taoyuan 33302 Taiwan
| | - Chia-Liang Sun
- Department of Neurosurgery; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
- Department of Chemical and Materials Engineering; Chang Gung University; Guishan Taoyuan 33302 Taiwan
| | - Horst Pick
- Laboratory of Biophysical Chemistry of Macromolecules; École Polytechnique Fédérale de Lausanne, EPFL; 1015 Lausanne Schweiz
| | - Jyh-Ping Chen
- Department of Chemical and Materials Engineering; Chang Gung University; Guishan Taoyuan 33302 Taiwan
- Department of Plastic and Reconstructive Surgery and Craniofacial Research Center; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
| | - Andreas Lesch
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sitten Schweiz
| | - Hubert H. Girault
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sitten Schweiz
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Lin TE, Lu YJ, Sun CL, Pick H, Chen JP, Lesch A, Girault HH. Soft Electrochemical Probes for Mapping the Distribution of Biomarkers and Injected Nanomaterials in Animal and Human Tissues. Angew Chem Int Ed Engl 2017; 56:16498-16502. [DOI: 10.1002/anie.201709271] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Tzu-En Lin
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sion Switzerland
| | - Yu-Jen Lu
- Department of Neurosurgery; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
- Chang Gung University College of Medicine; Guishan Taoyuan 33302 Taiwan
| | - Chia-Liang Sun
- Department of Neurosurgery; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
- Department of Chemical and Materials Engineering; Chang Gung University; Guishan Taoyuan 33302 Taiwan
| | - Horst Pick
- Laboratory of Biophysical Chemistry of Macromolecules; École Polytechnique Fédérale de Lausanne, EPFL; 1015 Lausanne Switzerland
| | - Jyh-Ping Chen
- Department of Chemical and Materials Engineering; Chang Gung University; Guishan Taoyuan 33302 Taiwan
- Department of Plastic and Reconstructive Surgery and Craniofacial Research Center; Linkou Chang Gung Memorial Hospital; Guishan Taoyuan 33305 Taiwan
| | - Andreas Lesch
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sion Switzerland
| | - Hubert H. Girault
- Laboratoire d'Electrochimie Physique et Analytique; École Polytechnique Fédérale de Lausanne; EPFL Valais Wallis; 1951 Sion Switzerland
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