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Takuma M, Fujita H, Zushi N, Nagano H, Azuma R, Kiyosawa T, Fujie T. An intrinsically semi-permeable PDMS nanosheet encapsulating adipose tissue-derived stem cells for enhanced angiogenesis. Biomater Sci 2024; 12:3401-3410. [PMID: 38804980 DOI: 10.1039/d4bm00460d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Cell encapsulation devices are expected to be promising tools that can control the release of therapeutic proteins secreted from transplanted cells. The protein permeability of the device membrane is important because it allows the isolation of transplanted cells while enabling the effectiveness of the device. In this study, we investigated free-standing polymeric ultra-thin films (nanosheets) as an intrinsically semi-permeable membrane made from polydimethylsiloxane (PDMS). The PDMS nanosheet with a thickness of 600 nm showed intrinsic protein permeability, and the device fabricated with the PDMS nanosheet showed that VEGF secreted from implanted adipose tissue-derived stem cells (ASCs) could be released for at least 5 days. The ASC encapsulation device promoted angiogenesis and the development of granulation tissue 1 week after transplantation to the subcutaneous area of a mouse. This cell encapsulation device consisting of PDMS nanosheets provides a new method for pre-vascularization of the subcutaneous area in cell transplantation therapy.
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Affiliation(s)
- Megumi Takuma
- School of Life Science and Technology, Tokyo Institute of Technology, B-50, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
| | - Hajime Fujita
- School of Life Science and Technology, Tokyo Institute of Technology, B-50, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
| | - Nanami Zushi
- School of Life Science and Technology, Tokyo Institute of Technology, B-50, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
| | - Hisato Nagano
- Department of Plastic and Reconstructive Surgery, National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
| | - Ryuichi Azuma
- Department of Plastic and Reconstructive Surgery, National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
| | - Tomoharu Kiyosawa
- Department of Plastic and Reconstructive Surgery, National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
| | - Toshinori Fujie
- School of Life Science and Technology, Tokyo Institute of Technology, B-50, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.
- Research Center for Autonomous Systems Materialogy (ASMat), Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan
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2
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Krishna S, Jung ST, Lee EY. Escherichia coli and Pichia pastoris: microbial cell-factory platform for -full-length IgG production. Crit Rev Biotechnol 2024:1-23. [PMID: 38797692 DOI: 10.1080/07388551.2024.2342969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 03/18/2024] [Indexed: 05/29/2024]
Abstract
Owing to the unmet demand, the pharmaceutical industry is investigating an alternative host to mammalian cells to produce antibodies for a variety of therapeutic and research applications. Regardless of some disadvantages, Escherichia coli and Pichia pastoris are the preferred microbial hosts for antibody production. Despite the fact that the production of full-length antibodies has been successfully demonstrated in E. coli, which has mostly been used to produce antibody fragments, such as: antigen-binding fragments (Fab), single-chain fragment variable (scFv), and nanobodies. In contrast, Pichia, a eukaryotic microbial host, is mostly used to produce glycosylated full-length antibodies, though hypermannosylated glycan is a major challenge. Advanced strategies, such as the introduction of human-like glycosylation in endotoxin-edited E. coli and cell-free system-based glycosylation, are making progress in creating human-like glycosylation profiles of antibodies in these microbes. This review begins by explaining the structural and functional requirements of antibodies and continues by describing and analyzing the potential of E. coli and P. pastoris as hosts for providing a favorable environment to create a fully functional antibody. In addition, authors compare these microbes on certain features and predict their future in antibody production. Briefly, this review analyzes, compares, and highlights E. coli and P. pastoris as potential hosts for antibody production.
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Affiliation(s)
- Shyam Krishna
- Department of Chemical Engineering (BK21 FOUR Integrated Engineering Program), Kyung Hee University, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Sang Taek Jung
- BK21 Graduate Program, Department of Biomedical Sciences, Graduate School, Korea University, Seoul, Republic of Korea
| | - Eun Yeol Lee
- Department of Chemical Engineering (BK21 FOUR Integrated Engineering Program), Kyung Hee University, Yongin-si, Gyeonggi-do, Republic of Korea
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3
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Mi W, Zhang X, Wang B, Sun R, Ma S, Hu Z, Dai X. Absolute protein quantification based on calibrated particle counting using electrospray-differential mobility analysis. Anal Chim Acta 2024; 1304:342534. [PMID: 38637035 DOI: 10.1016/j.aca.2024.342534] [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: 11/03/2023] [Revised: 03/13/2024] [Accepted: 03/25/2024] [Indexed: 04/20/2024]
Abstract
The traceability of in vitro diagnostics or drug products is based on the accurate quantification of proteins. In this study, we developed an absolute quantification approach for proteins. This method is based on calibrated particle counting using electrospray-differential mobility analysis (ES-DMA) coupled with a condensation particle counter (CPC). The absolute concentration of proteins was quantified with the observed protein particle number measured with ES-DMA-CPC, and the detection efficiency was determined by calibrators. The measurement performance and quantitative level were verified using two certificated reference materials, BSA and NIMCmAb. The linear regression fit for the detection efficiency values of three reference materials and one highly purified protein (myoglobin, BSA, NIMCmAb and fibrinogen) indicated that the detection efficiency and the particle size distribution of these proteins exhibited a linear relationship. Moreover, to explore the suitability of the detection efficiency-particle size curve for protein quantification, the concentrations of three typical proteinaceous particles, including two high molecular weight proteins (NIST reference material 8671 and D-dimer) and one protein complex (glutathione S-transferase dimer), were determined. This work suggests that this calibrated particle counting method is an efficient approach for nondestructive, rapid and accurate quantification of proteins, especially for measuring proteinaceous particles with tremendous size and without reference standards.
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Affiliation(s)
- Wei Mi
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China.
| | - Xinyi Zhang
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China
| | - Bin Wang
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China
| | - Ruixue Sun
- College of Life Sciences, China Jiliang University, Xueyuan Street 258, Hangzhou, 310018, China
| | - Shangying Ma
- College of Life Sciences, China Jiliang University, Xueyuan Street 258, Hangzhou, 310018, China
| | - Zhishang Hu
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China.
| | - Xinhua Dai
- National Institute of Metrology, No.18 Beisanhuan Donglu, Beijing, 100029, China.
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4
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Chao M, Pan Q, Li G, Peng C, Wang J, Wang Z. Highly Efficient Fabrication of Fluorescent "Turn-On" Lateral Flow Strips for Highly Sensitive Detection of Small Molecules Based on Self-Assembly of AuAg Nanoclusters. Anal Chem 2024; 96:7714-7722. [PMID: 38687680 DOI: 10.1021/acs.analchem.4c00956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Currently, fluorescent "turn-on" lateral flow assay (FONLFA) has shown enhanced "naked eye" detection sensitivity for small molecules, while it is urgent to adopt biocompatible fluorescent nanomaterials and needs new strategies to simplify the preparation process. In this study, a highly effective method was proposed to produce FONLFA strips for the detection of small molecules. The gold-silver nanoclusters (AuAgNCs) were immobilized onto the nitrocellulose membrane of the strips by the self-assembly of poly(sodium 4-styrenesulfonate), antigen, and AuAgNCs. The immobilization process entails a straightforward mixing of the three components, taking merely 1 min, thereby bypassing the necessity for chemical modification of fluorescent nanomaterials. The strategy offers a significantly simplified process, which substantially enhances the efficiency of the strip fabrication. Utilizing this method, a FONLFA was developed for carbendazim with a visual limit of detection (vLOD) reduced by 40-fold compared with the conventional colorimetric lateral flow assay (LFA). Furthermore, the approach demonstrates versatility by enabling the immobilization of AuAgNCs and streptavidin, which facilitates the development of aptamer-based FONLFAs. The designed aptamer-based FONLFA for kanamycin exhibited a 50-fold reduction in the vLOD compared with conventional colorimetric LFAs. Therefore, FONLFA holds promising potential for widespread applications in the analysis of small molecules.
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Affiliation(s)
- Mengjia Chao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Qiuli Pan
- Shandong Institute for Food and Drug Control, No. 2749 Xinluo Street, Jinan High-Tech Zone, Shandong 250101, PR China
| | - Guowen Li
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Chifang Peng
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- International Joint Laboratory on Food Safety, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
| | - Jun Wang
- Shandong Institute for Food and Drug Control, No. 2749 Xinluo Street, Jinan High-Tech Zone, Shandong 250101, PR China
| | - Zhouping Wang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
- International Joint Laboratory on Food Safety, Jiangnan University, Lihu Road 1800, Wuxi 214122, PR China
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5
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Liu S, Shu R, Zhao C, Sun C, Zhang M, Wang S, Li B, Dou L, Ji Y, Wang Y, Zhang D, Wang Z, Wang J. Precise Spectral Overlap-Based Donor-Acceptor Pair for a Sensitive Traffic Light-Typed Bimodal Multiplexed Lateral Flow Immunoassay. Anal Chem 2024; 96:5046-5055. [PMID: 38488055 DOI: 10.1021/acs.analchem.4c00881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Bimodal-type multiplexed immunoassays with complementary mode-based correlation analysis are gaining increasing attention for enhancing the practicability of the lateral flow immunoassay (LFIA). Nonetheless, the restriction in visually indistinguishable multitargets induced by a single fluorescent color and difficulty in single acceptor ineffectual fluorescence quenching due to the various spectra of multiple different donors impede the further execution of colorimetric-fluorescence bimodal-type multiplexed LFIAs. Herein, the precise spectral overlap-based donor-acceptor pair construction strategy is proposed by regulating the size of the nanocore, coating it with an appropriate nanoshell, and selecting a suitable fluorescence donor with distinct colors. By in situ coating Prussian blue nanoparticles (PBNPs) on AuNPs with a tunable size and absorption spectrum, the resultant APNPs demonstrate efficient fluorescence quenching ability, higher colloidal stability, remarkable colorimetric intensity, and an enhanced antibody coupling efficiency, all of which facilitate highly sensitive bimodal-type LFIA analysis. Following integration with competitive-type immunoreaction, this precise spectral overlap-supported spatial separation traffic light-typed colorimetric-fluorescence dual-response assay (coined as the STCFD assay) with the limits of detection of 0.013 and 0.152 ng mL-1 for ractopamine and clenbuterol, respectively, was proposed. This work illustrates the superiority of the rational design of a precise spectral overlap-based donor-acceptor pair, hinting at the enormous potential of the STCFD assay in the point-of-care field.
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Affiliation(s)
- Sijie Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Rui Shu
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Cong Zhao
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Chenyang Sun
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Mingrui Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Shaochi Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Bingzhi Li
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Leina Dou
- National Key Laboratory of Veterinary Public Health Security, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Yanwei Ji
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Yanru Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Daohong Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Zhanhui Wang
- National Key Laboratory of Veterinary Public Health Security, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Jianlong Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China
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6
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Peles J, Cacace B, Carbrello C, Giglia S, Zydney AL. Protein fouling during constant-flux virus filtration: Mechanisms and modeling. Biotechnol Bioeng 2023; 120:3357-3367. [PMID: 37489799 DOI: 10.1002/bit.28511] [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: 04/10/2023] [Revised: 06/16/2023] [Accepted: 07/12/2023] [Indexed: 07/26/2023]
Abstract
As biomanufacturers consider the transition from batch to continuous processing, it will be necessary to re-examine the design and operating conditions for many downstream processes. For example, the integration of virus removal filtration in continuous biomanufacturing will likely require operation at low and constant filtrate flux instead of the high (constant) transmembrane pressures (TMPs) currently employed in traditional batch processing. The objective of this study was to examine the effect of low operating filtrate flux (5-100 L/m2 /h) on protein fouling during normal flow filtration of human serum Immunoglobulin G (hIgG) through the Viresolve® Pro membrane, including a direct comparison of the fouling behavior during constant-flux and constant-pressure operation. The filter capacity, defined as the volumetric throughput of hIgG solution at which the TMP increased to 30 psi, showed a distinct minimum at intermediate filtrate flux (around 20-30 L/m2 /h). The fouling data were well-described using a previously-developed mechanistic model based on sequential pore blockage and cake filtration, suitably modified for operation at constant flux. Simple analytical expressions for the pressure profiles were developed in the limits of very low and high filtrate flux, enabling rapid estimation of the filter performance and capacity. The model calculations highlight the importance of both the pressure-dependent rate of pore blockage and the compressibility of the protein cake to the fouling behavior. These results provide important insights into the overall impact of constant-flux operation on the protein fouling behavior and filter capacity during virus removal filtration using the Viresolve® Pro membrane.
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Affiliation(s)
- Joshua Peles
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA
| | | | | | - Sal Giglia
- MilliporeSigma, Bedford, Massachusetts, USA
| | - Andrew L Zydney
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA
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7
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Kartowikromo KY, Olajide OE, Hamid AM. Collision cross section measurement and prediction methods in omics. JOURNAL OF MASS SPECTROMETRY : JMS 2023; 58:e4973. [PMID: 37620034 PMCID: PMC10530098 DOI: 10.1002/jms.4973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/26/2023] [Accepted: 07/20/2023] [Indexed: 08/26/2023]
Abstract
Omics studies such as metabolomics, lipidomics, and proteomics have become important for understanding the mechanisms in living organisms. However, the compounds detected are structurally different and contain isomers, with each structure or isomer leading to a different result in terms of the role they play in the cell or tissue in the organism. Therefore, it is important to detect, characterize, and elucidate the structures of these compounds. Liquid chromatography and mass spectrometry have been utilized for decades in the structure elucidation of key compounds. While prediction models of parameters (such as retention time and fragmentation pattern) have also been developed for these separation techniques, they have some limitations. Moreover, ion mobility has become one of the most promising techniques to give a fingerprint to these compounds by determining their collision cross section (CCS) values, which reflect their shape and size. Obtaining accurate CCS enables its use as a filter for potential analyte structures. These CCS values can be measured experimentally using calibrant-independent and calibrant-dependent approaches. Identification of compounds based on experimental CCS values in untargeted analysis typically requires CCS references from standards, which are currently limited and, if available, would require a large amount of time for experimental measurements. Therefore, researchers use theoretical tools to predict CCS values for untargeted and targeted analysis. In this review, an overview of the different methods for the experimental and theoretical estimation of CCS values is given where theoretical prediction tools include computational and machine modeling type approaches. Moreover, the limitations of the current experimental and theoretical approaches and their potential mitigation methods were discussed.
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Affiliation(s)
| | - Orobola E Olajide
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama, USA
| | - Ahmed M Hamid
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama, USA
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8
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Reiser M, Girelli A, Ragulskaya A, Das S, Berkowicz S, Bin M, Ladd-Parada M, Filianina M, Poggemann HF, Begam N, Akhundzadeh MS, Timmermann S, Randolph L, Chushkin Y, Seydel T, Boesenberg U, Hallmann J, Möller J, Rodriguez-Fernandez A, Rosca R, Schaffer R, Scholz M, Shayduk R, Zozulya A, Madsen A, Schreiber F, Zhang F, Perakis F, Gutt C. Resolving molecular diffusion and aggregation of antibody proteins with megahertz X-ray free-electron laser pulses. Nat Commun 2022; 13:5528. [PMID: 36130930 PMCID: PMC9490738 DOI: 10.1038/s41467-022-33154-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 08/26/2022] [Indexed: 11/09/2022] Open
Abstract
X-ray free-electron lasers (XFELs) with megahertz repetition rate can provide novel insights into structural dynamics of biological macromolecule solutions. However, very high dose rates can lead to beam-induced dynamics and structural changes due to radiation damage. Here, we probe the dynamics of dense antibody protein (Ig-PEG) solutions using megahertz X-ray photon correlation spectroscopy (MHz-XPCS) at the European XFEL. By varying the total dose and dose rate, we identify a regime for measuring the motion of proteins in their first coordination shell, quantify XFEL-induced effects such as driven motion, and map out the extent of agglomeration dynamics. The results indicate that for average dose rates below 1.06 kGy μs-1 in a time window up to 10 μs, it is possible to capture the protein dynamics before the onset of beam induced aggregation. We refer to this approach as correlation before aggregation and demonstrate that MHz-XPCS bridges an important spatio-temporal gap in measurement techniques for biological samples.
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Affiliation(s)
- Mario Reiser
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden.
| | - Anita Girelli
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Anastasia Ragulskaya
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Sudipta Das
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Sharon Berkowicz
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Maddalena Bin
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Marjorie Ladd-Parada
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Mariia Filianina
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Hanna-Friederike Poggemann
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden.,Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Nafisa Begam
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | | | - Sonja Timmermann
- Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072, Siegen, Germany
| | - Lisa Randolph
- Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072, Siegen, Germany
| | - Yuriy Chushkin
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, CS 40220, 38043, Grenoble Cedex 9, France
| | - Tilo Seydel
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042, Grenoble Cedex 9, France
| | - Ulrike Boesenberg
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Jörg Hallmann
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Johannes Möller
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | | | - Robert Rosca
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Robert Schaffer
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Markus Scholz
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Roman Shayduk
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Alexey Zozulya
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Anders Madsen
- European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869, Schenefeld, Germany
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Fivos Perakis
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91, Stockholm, Sweden.
| | - Christian Gutt
- Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072, Siegen, Germany.
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Conner CG, McAndrew J, Menegatti S, Velev OD. An accelerated antibody aggregation test based on time sequenced dynamic light scattering. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Xiong J, He S, Wang Z, Xu Y, Zhang L, Zhang H, Jiang H. Dual-readout fluorescence quenching immunochromatographic test strips for highly sensitive simultaneous detection of chloramphenicol and amantadine based on gold nanoparticle-triggered photoluminescent nanoswitch control. JOURNAL OF HAZARDOUS MATERIALS 2022; 429:128316. [PMID: 35101753 DOI: 10.1016/j.jhazmat.2022.128316] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/17/2022] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Herein, a novel fluorescence quenching immunochromatographic test strip (FQICTS) for simultaneous detection of chloramphenicol (CAP) and amantadine (AMD) was developed on the basis of inner filter effect (IFE), with the combination of gold nanoparticles (AuNPs) and highly luminescent green-emitting gold nanoclusters (AuNCs) as the IFE quencher/donor pair. The AuNPs could quench the excitation light and emission light of AuNCs and achieve a high IFE efficiency due to dual spectral overlapping. Under optimal conditions, the "turn-on" mode of the AuNCs-based dual-readout FQICTS showed good linearity for CAP detection in chicken samples from 0.05 ng/g to 10 ng/g, with a limit of detection (LOD) of 0.043 ng/g. The linear range of AMD is 0.5-50 ng/g, with LOD of 0.45 ng/g. The visual LODs of CAP and AMD in "turn-on" mode were 200 and 10 times lower than that in "turn-off" mode, respectively. The "turn-on" mode of FQICTS showed high recovery for detecting CAP (82.5-94.5%) and AMD (81.9-110.7%) spiked into chicken samples. The performance and practicability of the established method were verified with commercial enzyme-immunoassay kits, and good correlations were observed. Overall, the newly developed AuNCs-based dual-readout FQICTS is a promising on-site screening tool for rapid, high-sensitivity detection of multiple food contaminants in practical applications.
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Affiliation(s)
- Jincheng Xiong
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Shuang He
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Zile Wang
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Yuliang Xu
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Liang Zhang
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Huixia Zhang
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China
| | - Haiyang Jiang
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, Beijing Laboratory for Food Quality and Safety, Beijing 100193, People's Republic of China.
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11
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Mao X, Wang Y, Jiang L, Zhang H, Zhao Y, Liu P, Liu J, Hammock BD, Zhang C. A Polydopamine-Coated Gold Nanoparticles Quenching Quantum Dots-Based Dual-Readout Lateral Flow Immunoassay for Sensitive Detection of Carbendazim in Agriproducts. BIOSENSORS 2022; 12:bios12020083. [PMID: 35200343 PMCID: PMC8869244 DOI: 10.3390/bios12020083] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/27/2022] [Accepted: 01/28/2022] [Indexed: 06/12/2023]
Abstract
In this study, a fluorometric and colorimetric dual-readout lateral flow immunoassay (LFIA) using antibody functionalized polydopamine-coated gold nanoparticles (Au@PDAs) as a probe was developed for the detection of carbendazim (CBD). Colloidal gold nanoparticles (AuNPs) were coated with polydopamines (PDA) by the oxidation of dopamine to synthesize Au@PDA nanoparticles. The Au@PDA nanoparticles mediated ZnCdSe/ZnS quantum dots (QDs) fluorescence quenching and recovery, resulting in a reverse fluorescence enhancement detection format of CBD. The CBD detection was obtained by the competition between the CBD and the immobilized antigen for Au@PDAs labelled antibody binding, resulting in a significant fluorescence increase and colorimetry decrease corresponded to the concentration of CBD. Dual readout modes were incorporated into the LFIA using the colorimetry signal under natural light and the fluorescence signal under UV light. The cut-off value in the mode of the colorimetric signal and fluorometric signal for CBD detection was 0.5 μg/mL and 0.0156 μg/mL, respectively. The sensitivity of LFIA of the fluorescence mode was 32 times higher than that of the colorimetry mode. There was negligible cross reactivity obtained by using LFIA for the determination of thiabendazole, benomyl, thiophanate-methyl, and thiophanate-ethyl. Consistent and satisfactory results have been achieved by comparing the results of Au@PDAs-QDs-LFIA and liquid chromatography-tandem mass spectrometry (LC-MS/MS) testing spiked cucumber and strawberry samples, indicating good reliability of the Au@PDAs-QDs-LFIA.
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Affiliation(s)
- Xinxin Mao
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (X.M.); (L.J.); (J.L.)
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
| | - Yulong Wang
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
| | - Lan Jiang
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (X.M.); (L.J.); (J.L.)
| | - Hanxiaoya Zhang
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
| | - Yun Zhao
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
| | - Pengyan Liu
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
| | - Juanjuan Liu
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (X.M.); (L.J.); (J.L.)
| | - Bruce D. Hammock
- Department of Entomology and Nematology, UCD Comprehensive Cancer Center, University of California, Davis, CA 95616, USA;
| | - Cunzheng Zhang
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (X.M.); (L.J.); (J.L.)
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; (Y.W.); (H.Z.); (Y.Z.); (P.L.)
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- School of Biology and Food Engineering, Jiangsu University, Zhenjiang 212000, China
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12
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Yuan H, Cheng HW, Mears LLE, Huang R, Su R, Qi W, He Z, Valtiner M. Lipid Anchoring Improves Lubrication and Wear Resistance of the Collagen I Matrix. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13810-13815. [PMID: 34788036 PMCID: PMC8638261 DOI: 10.1021/acs.langmuir.1c01581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 11/06/2021] [Indexed: 05/12/2023]
Abstract
Osteoarthritis is a prevalent degenerative joint disease characterized by progressive articular cartilage loss and destruction. The resultant increase in friction causes severe pain. The collagen I matrix (COL I) has been used clinically for cartilage repair; however, how COL I acts at cartilage surfaces is unclear. Here, we studied adsorption and lubrication of synovial fluid components, albumin, γ-globulin, and the phospholipid DPPC, on COL I under physiological conditions using surface plasmon resonance and an in situ sensing surface force apparatus. Our results revealed COL I had poor lubrication ability, a fairly high coefficient of friction (COF, μ = 0.651 ± 0.013), and surface damage under a 7 mN load. DPPC formed an improved lubricating layer on COL I (μ = 0.072 ± 0.016). In sharp contrast, albumin and γ-globulin exhibited poor lubrication with an order of magnitude higher COF but still provided benefits by protecting COL I from wear. Hence, DPPC on COL I may help optimize COL I implantation design.
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Affiliation(s)
- Hui Yuan
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Hsiu-Wei Cheng
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Laura LE Mears
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
| | - Renliang Huang
- School
of Marine Science and Technology, Tianjin
University, Tianjin 300072, China
| | - Rongxin Su
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Wei Qi
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Zhimin He
- State
Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of
Membrane Science and Desalination Technology, School of Chemical Engineering
and Technology, Tianjin University and Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Markus Valtiner
- Institute
of Applied Physics, Vienna University of
Technology, Vienna 1040, Austria
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13
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nES-DMA with Charge-reduction based on Soft X-ray Radiation: Analysis of a Recombinant Monoclonal Antibody. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1182:122925. [PMID: 34543886 DOI: 10.1016/j.jchromb.2021.122925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 08/05/2021] [Accepted: 09/01/2021] [Indexed: 11/22/2022]
Abstract
Due to the fast growing importance of monoclonal antibodies in biomedical research, bioanalytics and human therapy, sensitive, fast and reliable methods are needed to monitor their production, target their characteristics, and for their final quality control. Application of a nano electrospray (nES) with soft X-ray radiation (SXR) based charge reduction and differential mobility analysis (DMA, aka nano electrospray gas-phase electrophoretic mobility molecular analysis, nES GEMMA) allows the size-separation and detection of macromolecules and (bio-)nanoparticles from a few nm up to several hundreds of nm in diameter in a native-like environment. The current study focuses on the analysis of a 148 kDa recombinant monoclonal antibody (rmAb) with the above mentioned instrumental setup and applying an universal detector, i.e. a water-based condensation particle detector (CPC). Next to the intact rmAb, its aggregates and fragment products after digestion with IdeS protease were analyzed. Additionally, influence of temperature treatment and pH variation on the stability of the rmAb was monitored. In this context, changes in electrophoretic mobility diameter (EMD) values, peak shape, and signal intensity based on particle numbers were of interest. Molecular weights calculated by application of a correlation derived from respective standard protein compounds were compared to mass spectrometric values and were found to be in good accordance. To conclude, we demonstrate that nES-DMA is a valuable tool in the characterization and quality control of rmABs.
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14
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Weiss VU, Denderz N, Allmaier G, Marchetti‐Deschmann M. Online hyphenation of size-exclusion chromatography and gas-phase electrophoresis facilitates the characterization of protein aggregates. Electrophoresis 2021; 42:1202-1208. [PMID: 33651392 PMCID: PMC8252587 DOI: 10.1002/elps.202100018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/06/2021] [Accepted: 02/07/2021] [Indexed: 11/07/2022]
Abstract
Gas-phase electrophoresis yields size distributions of polydisperse, aerosolized analytes based on electrophoretic principles. Nanometer-sized, surface-dry, single-charged particles are separated in a high laminar sheath flow of particle-free air and an orthogonal tunable electric field. Additionally, nano Electrospray Gas-Phase Electrophoretic Mobility Molecular Analyzer (nES GEMMA) data are particle-number based. Therefore, small particles can be detected next to larger ones without a bias, for example, native proteins next to their aggregates. Analyte transition from the liquid to the gas phase is a method inherent prerequisite. In this context, nonvolatile sample buffers influence results. In the worst case, the (bio-)nanoparticle signal is lost due to an increased baseline and unspecific clustering of nonvolatile components. We present a novel online hyphenation of liquid chromatography and gas-phase electrophoresis, coupling a size-exclusion chromatography (SEC) column to an advanced nES GEMMA. Via this novel approach, it is possible to (i) separate analyte multimers already present in liquid phase from aggregates formed during the nES process, (ii) differentiate liquid phase and spray-induced multimers, and (iii) to remove nonvolatile buffer components online before SEC-nES GEMMA analysis. Due to these findings, SEC-nES GEMMA has the high potential to help to understand aggregation processes in biological buffers adding the benefit of actual size determination for noncovalent assemblies formed in solution. As detection and characterization of protein aggregation in large-scale pharmaceutical production or sizing of noncovalently bound proteins are findings directly related to technologically and biologically relevant situations, we proposed the presented method to be a valuable addition to LC-MS approaches.
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Affiliation(s)
- Victor U. Weiss
- Institute for Chemical Technologies and AnalyticsTU Wien (Vienna University of Technology)ViennaAustria
| | - Natalia Denderz
- Institute for Chemical Technologies and AnalyticsTU Wien (Vienna University of Technology)ViennaAustria
| | - Günter Allmaier
- Institute for Chemical Technologies and AnalyticsTU Wien (Vienna University of Technology)ViennaAustria
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15
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Quantifying protein aggregation kinetics using electrospray differential mobility analysis. J Pharm Biomed Anal 2020; 177:112845. [DOI: 10.1016/j.jpba.2019.112845] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/27/2019] [Accepted: 08/28/2019] [Indexed: 11/18/2022]
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16
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Dodds JN, Baker ES. Ion Mobility Spectrometry: Fundamental Concepts, Instrumentation, Applications, and the Road Ahead. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:2185-2195. [PMID: 31493234 PMCID: PMC6832852 DOI: 10.1007/s13361-019-02288-2] [Citation(s) in RCA: 250] [Impact Index Per Article: 50.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 07/08/2019] [Accepted: 07/15/2019] [Indexed: 05/07/2023]
Abstract
Ion mobility spectrometry (IMS) is a rapid separation technique that has experienced exponential growth as a field of study. Interfacing IMS with mass spectrometry (IMS-MS) provides additional analytical power as complementary separations from each technique enable multidimensional characterization of detected analytes. IMS separations occur on a millisecond timescale, and therefore can be readily nested into traditional GC and LC/MS workflows. However, the continual development of novel IMS methods has generated some level of confusion regarding the advantages and disadvantages of each. In this critical insight, we aim to clarify some common misconceptions for new users in the community pertaining to the fundamental concepts of the various IMS instrumental platforms (i.e., DTIMS, TWIMS, TIMS, FAIMS, and DMA), while addressing the strengths and shortcomings associated with each. Common IMS-MS applications are also discussed in this review, such as separating isomeric species, performing signal filtering for MS, and incorporating collision cross-section (CCS) values into both targeted and untargeted omics-based workflows as additional ion descriptors for chemical annotation. Although many challenges must be addressed by the IMS community before mobility information is collected in a routine fashion, the future is bright with possibilities.
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Affiliation(s)
- James N Dodds
- Department of Chemistry, North Carolina State University, Raleigh, NC, 27695, USA
| | - Erin S Baker
- Department of Chemistry, North Carolina State University, Raleigh, NC, 27695, USA.
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17
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An estimate to the first approximation of microtubule rupture force. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2019; 48:569-577. [PMID: 31134309 DOI: 10.1007/s00249-019-01371-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 02/18/2019] [Accepted: 05/17/2019] [Indexed: 10/26/2022]
Abstract
Microtubule mechanical properties are essential for understanding basic cellular processes, including cell motility and division, but the forces that result in microtubule rupture or breakage have not yet been measured directly. These forces are essential to understand the mechanical properties of the cytoskeleton and responses by cells to both normal conditions and stress caused by injury or disease. Here we estimate the force required to rupture a microtubule by analyzing kinesin-14 Ncd motor-induced microtubule breakage in ensemble motility assays. We model the breakage events as caused by Ncd motors pulling or pushing on single microtubules that are clamped at one end by other motors attached to the glass surface. The number of pulling or pushing Ncd motors is approximated from the length of the microtubule bound to the surface and the forces produced by the pulling or pushing motors are estimated from forces produced by the Ncd motor in laser-trap assays, reported by others. Our analysis provides an estimate, to the first approximation, of ~ 500 pN for the minimal force required to rupture a 13-pf microtubule. The value we report is close to the forces estimated from microtubule stretching/fragmentation experiments and overlaps with the forces applied by AFM in microtubule indentation assays that destabilize microtubules and break microtubule protofilaments. It is also consistent with the forces required to disrupt protein noncovalent bonds in force spectroscopy experiments. These findings are relevant to microtubule deformation and breakage caused by cellular tension in vivo.
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18
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Torbensen K, Patel AN, Anne A, Chovin A, Demaille C, Bataille L, Michon T, Grelet E. Immuno-Based Molecular Scaffolding of Glucose Dehydrogenase and Ferrocene Mediator on fd Viral Particles Yields Enhanced Bioelectrocatalysis. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01263] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Kristian Torbensen
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Anisha N. Patel
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Agnès Anne
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Arnaud Chovin
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Christophe Demaille
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Laure Bataille
- UMR 1332 Biologie du Fruit et Pathologie, INRA, Université de Bordeaux, 71, Avenue Edouard Bourlaux, CS 20032-33882 CEDEX Villenave d’Ornon, France
| | - Thierry Michon
- UMR 1332 Biologie du Fruit et Pathologie, INRA, Université de Bordeaux, 71, Avenue Edouard Bourlaux, CS 20032-33882 CEDEX Villenave d’Ornon, France
| | - Eric Grelet
- Centre de Recherche Paul-Pascal, UMR 5031 CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600 Pessac, France
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19
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Wang HL, Huang CP, Su CH, Tsai DH. A facile quantification of hyaluronic acid and its crosslinking using gas-phase electrophoresis. Anal Bioanal Chem 2019; 411:1443-1451. [PMID: 30659324 DOI: 10.1007/s00216-019-01584-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 12/26/2018] [Accepted: 01/03/2019] [Indexed: 12/11/2022]
Abstract
We report a facile, high-resolution approach to quantitatively characterize hyaluronic acid (HA) and study its crosslinking reaction using electrospray-differential mobility analysis (ES-DMA). Mobility size distributions, number concentrations, molecular mass distributions, and polydispersity index of HAs were obtained successfully via a rapid analysis by ES-DMA (< 30 min). The limit of detection, the limit of quantification, and the precision of the mobility size measurement achieve 2.5 nm, 4.0 nm, and 0.3 nm, respectively. Size exclusion chromatography (SEC) was employed as an orthogonal approach, showing that the averaged molecular mass and polydispersity index of HA measured by ES-DMA were close to the results of SEC on a semi-quantitative basis. The 1,4-butanediol diglycidyl ether (BDDE)-induced crosslinking of HA was also able to be successfully characterized through a time-dependent study using ES-DMA, which has shown the promise of direct analysis of solution-based reactions. Both the extent and the rate of HA crosslinking (induced by BDDE) were proportional to reaction temperature and concentration ratio of HA to BDDE. The activation energy of the reaction-limited BDDE-induced crosslinking of HA was found to be ≈ 21 kJ/mol. The prototype study demonstrates ES-DMA as a new method for a rapid quantitative characterization of HA and its derivative product and providing a capability of real-time monitoring of the HA crosslinking during formulation process. Graphical abstract.
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Affiliation(s)
- Hung-Li Wang
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan, Republic of China
| | - Chin-Ping Huang
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, 31040, Taiwan, Republic of China
| | - Chiu-Hun Su
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu, 31040, Taiwan, Republic of China
| | - De-Hao Tsai
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300, Taiwan, Republic of China.
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20
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Inner-filter effect based fluorescence-quenching immunochromotographic assay for sensitive detection of aflatoxin B1 in soybean sauce. Food Control 2018. [DOI: 10.1016/j.foodcont.2018.06.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Intracellular and transdermal protein delivery mediated by non-covalent interactions with a synthetic guanidine-rich molecular carrier. Int J Pharm 2017. [DOI: 10.1016/j.ijpharm.2017.06.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Patel AN, Anne A, Chovin A, Demaille C, Grelet E, Michon T, Taofifenua C. Scaffolding of Enzymes on Virus Nanoarrays: Effects of Confinement and Virus Organization on Biocatalysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603163. [PMID: 28098963 DOI: 10.1002/smll.201603163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/18/2016] [Indexed: 06/06/2023]
Abstract
Organizing active enzyme molecules on nanometer-sized scaffolds is a promising strategy for designing highly efficient supported catalytic systems for biosynthetic and sensing applications. This is achieved by designing model nanoscale enzymatic platforms followed by thorough analysis of the catalytic activity. Herein, the virus fd bacteriophage is considered as an enzyme nanocarrier to study the scaffolding effects on enzymatic activity. Nanoarrays of randomly oriented, or directionally patterned, fd bacteriophage virus are functionalized with the enzyme glucose oxidase (GOx), using an immunological assembly strategy, directly on a gold electrode support. The scaffolding process on the virus capsid is monitored in situ by AFM (atomic force microscopy) imaging, while cyclic voltammetry is used to interrogate the catalytic activity of the resulting functional GOx-fd nanoarrays. Kinetic analysis reveals the ability to modulate the activity of GOx via nanocarrier patterning. The results evidence, for the first time, enhancement of the enzymatic activity due to scaffolding on a filamentous viral particle.
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Affiliation(s)
- Anisha N Patel
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205, Paris Cedex 13, France
| | - Agnès Anne
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205, Paris Cedex 13, France
| | - Arnaud Chovin
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205, Paris Cedex 13, France
| | - Christophe Demaille
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205, Paris Cedex 13, France
| | - Eric Grelet
- Centre de Recherche Paul-Pascal, UPR 8641 CNRS, Université de Bordeaux, 115 avenue Schweitzer, 33600, Pessac, France
| | - Thierry Michon
- Biologie du Fruit et Pathologie, UMR 1332 INRA, Université de Bordeaux, 71 avenue Edouard Bourlaux, CS20032, 33882, Villenave d'Ornon Cedex, France
| | - Cécilia Taofifenua
- Laboratoire d'Electrochimie Moléculaire, UMR 7591 CNRS, Université Paris Diderot, Sorbonne Paris Cité, 15 rue Jean-Antoine de Baïf, F-75205, Paris Cedex 13, France
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23
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Brinet D, Gaie-Levrel F, Delatour V, Kaffy J, Ongeri S, Taverna M. In vitro monitoring of amyloid β-peptide oligomerization by Electrospray differential mobility analysis: An alternative tool to evaluate Alzheimer's disease drug candidates. Talanta 2017; 165:84-91. [DOI: 10.1016/j.talanta.2016.12.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 12/04/2016] [Accepted: 12/06/2016] [Indexed: 11/27/2022]
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24
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Jiang H, Li X, Xiong Y, Pei K, Nie L, Xiong Y. Silver Nanoparticle-Based Fluorescence-Quenching Lateral Flow Immunoassay for Sensitive Detection of Ochratoxin A in Grape Juice and Wine. Toxins (Basel) 2017; 9:toxins9030083. [PMID: 28264472 PMCID: PMC5371838 DOI: 10.3390/toxins9030083] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 02/23/2017] [Accepted: 02/23/2017] [Indexed: 12/12/2022] Open
Abstract
A silver nanoparticle (AgNP)-based fluorescence-quenching lateral flow immunoassay with competitive format (cLFIA) was developed for sensitive detection of ochratoxin A (OTA) in grape juice and wine samples in the present study. The Ru(phen)32+-doped silica nanoparticles (RuNPs) were sprayed on the test and control line zones as background fluorescence signals. The AgNPs were designed as the fluorescence quenchers of RuNPs because they can block the exciting light transferring to the RuNP molecules. The proposed method exhibited high sensitivity for OTA detection, with a detection limit of 0.06 µg/L under optimized conditions. The method also exhibited a good linear range for OTA quantitative analysis from 0.08 µg/L to 5.0 µg/L. The reliability of the fluorescence-quenching cLFIA method was evaluated through analysis of the OTA-spiked red grape wine and juice samples. The average recoveries ranged from 88.0% to 110.0% in red grape wine and from 92.0% to 110.0% in grape juice. Meanwhile, less than a 10% coefficient variation indicated an acceptable precision of the cLFIA method. In summary, the new AgNP-based fluorescence-quenching cLFIA is a simple, rapid, sensitive, and accurate method for quantitative detection of OTA in grape juice and wine or other foodstuffs.
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Affiliation(s)
- Hu Jiang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
- Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, China.
| | - Xiangmin Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
- Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, China.
| | - Ying Xiong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
| | - Ke Pei
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
| | - Lijuan Nie
- Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, China.
| | - Yonghua Xiong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
- Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, China.
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Clouet-Foraison N, Gaie-Levrel F, Coquelin L, Ebrard G, Gillery P, Delatour V. Absolute Quantification of Bionanoparticles by Electrospray Differential Mobility Analysis: An Application to Lipoprotein Particle Concentration Measurements. Anal Chem 2017; 89:2242-2249. [DOI: 10.1021/acs.analchem.6b02909] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Noémie Clouet-Foraison
- Laboratoire National de Métrologie et d’Essais, LNE, Chemistry and Biology Division, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France
| | - Francois Gaie-Levrel
- Laboratoire National de Métrologie et d’Essais, LNE, Chemistry and Biology Division, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France
| | - Loic Coquelin
- Laboratoire National de Métrologie et d’Essais, LNE, Chemistry and Biology Division, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France
| | - Géraldine Ebrard
- Laboratoire National de Métrologie et d’Essais, LNE, Chemistry and Biology Division, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France
| | - Philippe Gillery
- University
of
Reims Champagne-Ardenne, Faculty of Medicine, UMR CNRS/URCA n°7369
and University Hospital of Reims, Laboratory of Pediatric Biology
and Research, 45 rue Cognacq-Jay, 51092 Reims Cedex, France
| | - Vincent Delatour
- Laboratoire National de Métrologie et d’Essais, LNE, Chemistry and Biology Division, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France
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26
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Engel NY, Weiss VU, Marchetti-Deschmann M, Allmaier G. nES GEMMA Analysis of Lectins and Their Interactions with Glycoproteins - Separation, Detection, and Sampling of Noncovalent Biospecific Complexes. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:77-86. [PMID: 27644941 PMCID: PMC5174143 DOI: 10.1007/s13361-016-1483-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 07/24/2016] [Accepted: 08/13/2016] [Indexed: 06/06/2023]
Abstract
In order to better understand biological events, lectin-glycoprotein interactions are of interest. The possibility to gather more information than the mere positive or negative response for interactions brought mass spectrometry into the center of many research fields. The presented work shows the potential of a nano-electrospray gas-phase electrophoretic mobility molecular analyzer (nES GEMMA) to detect weak, noncovalent, biospecific interactions besides still unbound glycoproteins and unreacted lectins without prior liquid phase separation. First results for Sambucus nigra agglutinin, concanavalin A, and wheat germ agglutinin and their retained noncovalent interactions with glycoproteins in the gas phase are presented. Electrophoretic mobility diameters (EMDs) were obtained by nES GEMMA for all interaction partners correlating very well with molecular masses determined by matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) of the individual molecules. Moreover, EMDs measured for the lectin-glycoprotein complexes were in good accordance with theoretically calculated mass values. Special focus was laid on complex formation for different lectin concentrations and binding specificities to evaluate the method with respect to results obtained in the liquid phase. The latter was addressed by capillary electrophoresis on-a-chip (CE-on-a-chip). Of exceptional interest was the fact that the formed complexes could be sampled according to their size onto nitrocellulose membranes after gas-phase separation. Subsequent immunological investigation further proved that the collected complex actually retained its native structure throughout nES GEMMA analysis and sampling. Graphical Abstract ᅟ.
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Affiliation(s)
- Nicole Y Engel
- Institute of Chemical Technologies and Analytics, TU Wien (Vienna University of Technology), Getreidemarkt 9/164-IAC, A-1060, Vienna, Austria
| | - Victor U Weiss
- Institute of Chemical Technologies and Analytics, TU Wien (Vienna University of Technology), Getreidemarkt 9/164-IAC, A-1060, Vienna, Austria
| | - Martina Marchetti-Deschmann
- Institute of Chemical Technologies and Analytics, TU Wien (Vienna University of Technology), Getreidemarkt 9/164-IAC, A-1060, Vienna, Austria
| | - Günter Allmaier
- Institute of Chemical Technologies and Analytics, TU Wien (Vienna University of Technology), Getreidemarkt 9/164-IAC, A-1060, Vienna, Austria.
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27
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Berto M, Casalini S, Di Lauro M, Marasso SL, Cocuzza M, Perrone D, Pinti M, Cossarizza A, Pirri CF, Simon DT, Berggren M, Zerbetto F, Bortolotti CA, Biscarini F. Biorecognition in Organic Field Effect Transistors Biosensors: The Role of the Density of States of the Organic Semiconductor. Anal Chem 2016; 88:12330-12338. [DOI: 10.1021/acs.analchem.6b03522] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Marcello Berto
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Stefano Casalini
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Michele Di Lauro
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Simone L. Marasso
- Dipartimento
di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
- IMEM-CNR, Parco Area delle Scienze 37, 43124 Parma, Italy
| | - Matteo Cocuzza
- Dipartimento
di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
- IMEM-CNR, Parco Area delle Scienze 37, 43124 Parma, Italy
| | - Denis Perrone
- Istituto Italiano di Tecnologia, Center for Sustainable
Futures, Corso Trento
21, 10129 Torino, Italy
| | - Marcello Pinti
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Andrea Cossarizza
- Dipartimento
di Scienze Mediche e Chirurgiche Materno-Infantili e dell’Adulto, Università di Modena e Reggio Emilia, Via Campi 287, 41125 Modena, Italy
| | - Candido F. Pirri
- Dipartimento
di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
- Istituto Italiano di Tecnologia, Center for Sustainable
Futures, Corso Trento
21, 10129 Torino, Italy
| | - Daniel T. Simon
- Laboratory
of Organic Electronics, Department of Science and Technology, ITN, Linköping University, S-601 74 Norrköping, Sweden
| | - Magnus Berggren
- Laboratory
of Organic Electronics, Department of Science and Technology, ITN, Linköping University, S-601 74 Norrköping, Sweden
| | - Francesco Zerbetto
- Dipartimento
di Chimica “G. Ciamician”, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Carlo A. Bortolotti
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Fabio Biscarini
- Dipartimento
di Scienze della Vita, Università di Modena e Reggio Emilia, Via Campi 103, 41125 Modena, Italy
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28
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Yordanov G, Gemeiner P, Katrlík J. Study of interactions between blood plasma proteins and poly(butyl cyanoacrylate) drug nanocarriers by surface plasmon resonance. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.05.080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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29
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Weiss VU, Urey C, Gondikas A, Golesne M, Friedbacher G, von der Kammer F, Hofmann T, Andersson R, Marko-Varga G, Marchetti-Deschmann M, Allmaier G. Nano electrospray gas-phase electrophoretic mobility molecular analysis (nES GEMMA) of liposomes: applicability of the technique for nano vesicle batch control. Analyst 2016; 141:6042-6050. [PMID: 27549027 PMCID: PMC5066478 DOI: 10.1039/c6an00687f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 08/03/2016] [Indexed: 01/28/2023]
Abstract
Liposomes are biodegradable nanoparticle vesicles consisting of a lipid bilayer encapsulating an aqueous core. Entrapped cargo material is shielded from the extra-vesicular medium and sustained release of encapsulated material can be achieved. However, application of liposomes as nano-carriers demands their characterization concerning size and size distribution, particle-number concentration, occurrence of vesicle building blocks in solution and determination of the resulting vesicle encapsulation capacity. These questions can be targeted via gas-phase electrophoretic mobility molecular analysis (GEMMA) based on a nano electrospray (nES) charge-reduction source. This instrument separates single-charged nanoparticles in the gas-phase according to size in a high-laminar sheath-flow by means of an orthogonal, tunable electric field. nES GEMMA analysis enables to confirm liposome integrity after passage through the instrument (in combination with atomic force microscopy) as well as to exclude vesicle aggregation. Additionally, nanoparticle diameters at peak apexes and size distribution data are obtained. Differences of hydrodynamic and dry particle diameter values, as well as the effect of number- and mass-based concentration data analysis on obtained liposome diameters are shown. Furthermore, the repeatability of liposome preparation is studied, especially upon incorporation of PEGylated lipids in the bilayer. Finally, the instruments applicability to monitor mechanical stress applied to vesicles is demonstrated.
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Affiliation(s)
- Victor U Weiss
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
| | - Carlos Urey
- Department of Surgery, University of Lund, Lund, Sweden
| | - Andreas Gondikas
- Department of Environmental Geosciences and Environmental Science Research Network, University of Vienna, Vienna, Austria
| | - Monika Golesne
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
| | - Gernot Friedbacher
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
| | - Frank von der Kammer
- Department of Environmental Geosciences and Environmental Science Research Network, University of Vienna, Vienna, Austria
| | - Thilo Hofmann
- Department of Environmental Geosciences and Environmental Science Research Network, University of Vienna, Vienna, Austria
| | | | | | | | - Günter Allmaier
- Institute of Chemical Technologies and Analytics, TU Wien, Vienna, Austria.
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30
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Lin WW, Chen IJ, Cheng TC, Tung YC, Chu PY, Chuang CH, Hsieh YC, Huang CC, Wang YT, Kao CH, Roffler SR, Cheng TL. A Secondary Antibody-Detecting Molecular Weight Marker with Mouse and Rabbit IgG Fc Linear Epitopes for Western Blot Analysis. PLoS One 2016; 11:e0160418. [PMID: 27494183 PMCID: PMC4975442 DOI: 10.1371/journal.pone.0160418] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 07/19/2016] [Indexed: 11/18/2022] Open
Abstract
Molecular weight markers that can tolerate denaturing conditions and be auto-detected by secondary antibodies offer great efficacy and convenience for Western Blotting. Here, we describe M&R LE protein markers which contain linear epitopes derived from the heavy chain constant regions of mouse and rabbit immunoglobulin G (IgG Fc LE). These markers can be directly recognized and stained by a wide range of anti-mouse and anti-rabbit secondary antibodies. We selected three mouse (M1, M2 and M3) linear IgG1 and three rabbit (R1, R2 and R3) linear IgG heavy chain epitope candidates based on their respective crystal structures. Western blot analysis indicated that M2 and R2 linear epitopes are effectively recognized by anti-mouse and anti-rabbit secondary antibodies, respectively. We fused the M2 and R2 epitopes (M&R LE) and incorporated the polypeptide in a range of 15–120 kDa auto-detecting markers (M&R LE protein marker). The M&R LE protein marker can be auto-detected by anti-mouse and anti-rabbit IgG secondary antibodies in standard immunoblots. Linear regression analysis of the M&R LE protein marker plotted as gel mobility versus the log of the marker molecular weights revealed good linearity with a correlation coefficient R2 value of 0.9965, indicating that the M&R LE protein marker displays high accuracy for determining protein molecular weights. This accurate, regular and auto-detected M&R LE protein marker may provide a simple, efficient and economical tool for protein analysis.
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Affiliation(s)
- Wen-Wei Lin
- Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - I-Ju Chen
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ta-Chun Cheng
- Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yi-Ching Tung
- Department of Public Health and Environmental Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Pei-Yu Chu
- Department of Medical Laboratory Science and Biotechnology, College of Health Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chih-Hung Chuang
- Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yuan-Chin Hsieh
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chien-Chiao Huang
- Graduate Institute of Clinical Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yeng-Tseng Wang
- Department of Biochemistry, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chien-Han Kao
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Steve R. Roffler
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
- * E-mail: (TLC); (SRR)
| | - Tian-Lu Cheng
- Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Center for Biomarkers and Biotech Drugs, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan
- * E-mail: (TLC); (SRR)
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31
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Wang W, Voigt A, Wolff MW, Reichl U, Sundmacher K. Binding kinetics and multi-bond: Finding correlations by synthesizing interactions between ligand-coated bionanoparticles and receptor surfaces. Anal Biochem 2016; 505:8-17. [PMID: 27108189 DOI: 10.1016/j.ab.2016.04.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 03/08/2016] [Accepted: 04/03/2016] [Indexed: 12/11/2022]
Abstract
The number of bonds formed between one single bionanoparticle and many surface receptors is an important subject to be studied but is seldom quantitatively investigated. A new evaluation of the correlation between binding kinetics and number of bonds is presented by varying ligand density and receptor density. An experimental system was developed using measurements with surface plasmon resonance spectroscopy. A corresponding multi-site adsorption model elucidated the correlation. The results show that with the increase of the receptor density, the adsorption rate first decreased when the number of bonds was below a maximum value and then increased when the number of bonds stayed at this maximum value. The investigation on ligand density variation suggests that the coating density on top of the bionanoparticle surface may have a particular value below which more ligand will accelerate the adsorption rate. The ratio of ligand amount bound by the receptors to the total ligand amount associated with a single bionanoparticle will remain constant even if one attaches more ligands to a bionanoparticle. We envision that the bionanoparticle desorption will not depend on density changes from either ligand or receptor when the number of bonds reaches a specific efficient value.
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Affiliation(s)
- Wenjing Wang
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany.
| | - Andreas Voigt
- Chair for Process Systems Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Michael W Wolff
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Bioprocess Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Udo Reichl
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Bioprocess Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
| | - Kai Sundmacher
- Max Planck Institute for Dynamics of Complex Technical Systems, D-39106 Magdeburg, Germany; Chair for Process Systems Engineering, Otto-von-Guericke University Magdeburg, D-39106 Magdeburg, Germany
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32
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de Puig H, Tam JO, Yen CW, Gehrke L, Hamad-Schifferli K. Extinction Coefficient of Gold Nanostars. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2015; 119:17408-17415. [PMID: 28018519 PMCID: PMC5176261 DOI: 10.1021/acs.jpcc.5b03624] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Gold nanostars (NStars) are highly attractive for biological applications due to their surface chemistry, facile synthesis and optical properties. Here, we synthesize NStars in HEPES buffer at different HEPES/Au ratios, producing NStars of different sizes and shapes, and therefore varying optical properties. We measure the extinction coefficient of the synthesized NStars at their maximum surface plasmon resonances (SPR), which range from 5.7 × 108 to 26.8 × 108 M-1cm-1. Measured values correlate with those obtained from theoretical models of the NStars using the discrete dipole approximation (DDA), which we use to simulate the extinction spectra of the nanostars. Finally, because NStars are typically used in biological applications, we conjugate DNA and antibodies to the NStars and calculate the footprint of the bound biomolecules.
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Affiliation(s)
- Helena de Puig
- Dept. of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Justina O. Tam
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology Cambridge, MA USA 02139
- Winchester Engineering Analytical Center, Food and Drug Administration. Winchester MA USA 01890
| | - Chun-Wan Yen
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology Cambridge, MA USA 02139
- Winchester Engineering Analytical Center, Food and Drug Administration. Winchester MA USA 01890
| | - Lee Gehrke
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology Cambridge, MA USA 02139
- Dept. of Microbiology and Immunobiology, Harvard Medical School, Boston 02115
- Corresponding Authors: Kimberly Hamad-Schifferli, , Lee Gehrke,
| | - Kimberly Hamad-Schifferli
- Dept. of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
- Corresponding Authors: Kimberly Hamad-Schifferli, , Lee Gehrke,
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33
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Tajiri T, Matsumoto S, Imato T, Okamoto T, Haraguchi M. Optical characterization of the antigen-antibody thin layer using the whispering gallery mode. ANAL SCI 2015; 30:799-804. [PMID: 25109641 DOI: 10.2116/analsci.30.799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We immobilized an antibody (anti-β-Galactosidase) on a polystyrene microsphere by using a covalent bond, and observed the resonance peaks in the scattered light intensity spectra related to the whispering gallery mode (WGM) excitation of the microsphere. The amount and the optical parameters, i.e., thickness and refractive index, of anti-β-Galactosidase on the sphere surface were evaluated based on an absorbance measurement and a resonance peak shift measurement, respectively. Moreover, we measured the variation of the WGM spectra depending on the concentration of the enzyme solution (β-Galactosidase), which allowed us to optically evaluate the thickness and the refractive index of the antigen-antibody layer from the shift of the WGM spectra peak.
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34
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Rapid Simultaneous Detection of Anti-protozoan Drugs Using a Lateral-Flow Immunoassay Format. Appl Biochem Biotechnol 2015; 176:387-98. [DOI: 10.1007/s12010-015-1582-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 03/12/2015] [Indexed: 12/21/2022]
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35
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Tai JT, Lai YC, Yang JH, Ho HC, Wang HF, Ho RM, Tsai DH. Quantifying Nanosheet Graphene Oxide Using Electrospray-Differential Mobility Analysis. Anal Chem 2015; 87:3884-9. [DOI: 10.1021/ac504671k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jui-Ting Tai
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Yen-Chih Lai
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
- Center
for Measurement Standards, Industrial Technology Research Institute, Hsinchu 31040, Taiwan, Republic of China
| | - Jian-He Yang
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Hsin-Chia Ho
- Center
for Measurement Standards, Industrial Technology Research Institute, Hsinchu 31040, Taiwan, Republic of China
| | - Hsiao-Fang Wang
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - Rong-Ming Ho
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
| | - De-Hao Tsai
- Department
of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, Republic of China
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36
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Parkes M, Myant C, Cann PM, Wong JS. Synovial Fluid Lubrication: The Effect of Protein Interactions on Adsorbed and Lubricating Films. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.biotri.2015.05.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Offman E, Edginton AN. A PBPK workflow for first-in-human dose selection of a subcutaneously administered pegylated peptide. J Pharmacokinet Pharmacodyn 2015; 42:135-50. [PMID: 25650156 DOI: 10.1007/s10928-015-9406-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Accepted: 01/24/2015] [Indexed: 12/12/2022]
Abstract
Predicting the pharmacokinetic (PK) time course of a subcutaneously (SC) administered novel therapeutic protein using in silico approaches offers an opportunity to streamline the drug development process by facilitating selection of starting and target doses in initial human trials. Herein, we propose a workflow for predicting the human exposure time course following SC administration. Leveraging knowledge obtained following both intravenous and SC administration in monkeys, this workflow employs the development of a whole body physiologically-based pharmacokinetic (PBPK) model incorporating vascular circulation, lymphatic uptake and both renal and non-specific clearance mechanisms to predict the PK of a novel pegylated peptide. Optimization of the model was initially performed in monkeys, after which the model was scaled up to human proportion. Inclusion of a SC depot compartment allowed for precise simulation of the SC time course in monkeys. Simulated human exposure after SC administration was within approximately 20 % of the observed values and successfully predicted the time course of two subsequent dosing levels. This workflow represents one of the first publications of a PBPK workflow to predict the time course of a SC administered therapeutic protein based off of a single, non-human primate species and shows promise in facilitating the dose selection in first-in-human dose escalation studies for novel protein therapeutics.
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Affiliation(s)
- Elliot Offman
- School of Pharmacy, University of Waterloo, 200 University Ave W, Waterloo, ON, N2L 3G1, Canada,
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38
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Hamid Mujawar L, van Amerongen A, Norde W. Influence of Pluronic F127 on the distribution and functionality of inkjet-printed biomolecules in porous nitrocellulose substrates. Talanta 2015; 131:541-7. [DOI: 10.1016/j.talanta.2014.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 07/30/2014] [Accepted: 08/02/2014] [Indexed: 10/24/2022]
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39
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Abundance of the multiheme c-type cytochrome OmcB increases in outer biofilm layers of electrode-grown Geobacter sulfurreducens. PLoS One 2014; 9:e104336. [PMID: 25090411 PMCID: PMC4121341 DOI: 10.1371/journal.pone.0104336] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 07/14/2014] [Indexed: 11/25/2022] Open
Abstract
When Geobacter sulfurreducens utilizes an electrode as its electron acceptor, cells embed themselves in a conductive biofilm tens of microns thick. While environmental conditions such as pH or redox potential have been shown to change close to the electrode, less is known about the response of G. sulfurreducens to growth in this biofilm environment. To investigate whether respiratory protein abundance varies with distance from the electrode, antibodies against an outer membrane multiheme cytochrome (OmcB) and cytoplasmic acetate kinase (AckA) were used to determine protein localization in slices spanning ∼25 µm-thick G. sulfurreducens biofilms growing on polished electrodes poised at +0.24 V (vs. Standard Hydrogen Electrode). Slices were immunogold labeled post-fixing, imaged via transmission electron microscopy, and digitally reassembled to create continuous images allowing subcellular location and abundance per cell to be quantified across an entire biofilm. OmcB was predominantly localized on cell membranes, and 3.6-fold more OmcB was detected on cells 10–20 µm distant from the electrode surface compared to inner layers (0–10 µm). In contrast, acetate kinase remained constant throughout the biofilm, and was always associated with the cell interior. This method for detecting proteins in intact conductive biofilms supports a model where the utilization of redox proteins changes with depth.
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40
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Chunta S, Suk-Anake J, Chansiri K, Promptmas C. A piezoelectric-based immunosensor for high density lipoprotein particle measurement. Analyst 2014; 139:4586-92. [DOI: 10.1039/c4an00601a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Tseng YH, Pease LF. Electrospray differential mobility analysis for nanoscale medicinal and pharmaceutical applications. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2014; 10:1591-600. [PMID: 24846522 DOI: 10.1016/j.nano.2014.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Revised: 04/21/2014] [Accepted: 05/12/2014] [Indexed: 12/14/2022]
Abstract
Nanoscale characterization tools hold the potential to overcome long-standing medicinal and pharmaceutical challenges. For example, electrospray differential mobility analysis (ES-DMA) is an emerging tool that rapidly provides label-free multimodal size distributions for proteins and particles from ~1 nm to <500 nm with subnanometer precision. Here we critically review the contributions of this tool to medicine, pharmaceutical practice, and pharmaceutical production. Our review critically evaluates, first, the use of ES-DMA for diagnostic strategies that detect and quantify lipoproteins, bacterial infections, viruses and amyloid fibrillation and then focuses on ES-DMA's contribution to treatment strategies that employ tailored virus-like particles as vaccines and decorated nanoparticle vectors for gene delivery. Our review also highlights ES-DMA's contribution to viral clearance and antibody aggregation and potential as a process analytical technology (PAT). FROM THE CLINICAL EDITOR Electrospray differential mobility analysis is an emerging nanotechnology-based tool with potential clinical utility in the detection and quantification of lipoproteins, glycoproteins, viruses, amyloids, bacterial infections. Its contribution to treatment strategies and pharmaceutical production is also discussed in this comprehensive review.
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Affiliation(s)
- Yen-Hsun Tseng
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Leonard F Pease
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA; Department of Internal Medicine, Division of Gastroenterology, University of Utah, Salt Lake City, UT, USA; Department of Pharmaceutics & Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT, USA.
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Tercero N, Kotarek J. Voltammetric Monitoring of Protein Aggregation from Solution Using Tris-(2,2′-Bipyridine) Osmium(II) Chloride Complex as an Electrocatalytic Mediator. ELECTROANAL 2014. [DOI: 10.1002/elan.201300463] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Larriba C, Hogan CJ. Ion Mobilities in Diatomic Gases: Measurement versus Prediction with Non-Specular Scattering Models. J Phys Chem A 2013; 117:3887-901. [DOI: 10.1021/jp312432z] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Carlos Larriba
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455,
United States
| | - Christopher J. Hogan
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455,
United States
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Periyakaruppan A, Gandhiraman RP, Meyyappan M, Koehne JE. Label-Free Detection of Cardiac Troponin-I Using Carbon Nanofiber Based Nanoelectrode Arrays. Anal Chem 2013; 85:3858-63. [DOI: 10.1021/ac302801z] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Ram P. Gandhiraman
- Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - M. Meyyappan
- Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Jessica E. Koehne
- Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California 94035, United States
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Kurihara Y, Takama M, Masubuchi M, Ooya T, Takeuchi T. Microfluidic reflectometric interference spectroscopy-based sensing for exploration of protein–protein interaction conditions. Biosens Bioelectron 2013; 40:247-51. [DOI: 10.1016/j.bios.2012.07.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 07/02/2012] [Accepted: 07/19/2012] [Indexed: 01/17/2023]
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Read T, Olkhov RV, Shaw AM. Measurement of the localised plasmon penetration depth for gold nanoparticles using a non-invasive bio-stacking method. Phys Chem Chem Phys 2013; 15:6122-7. [DOI: 10.1039/c3cp50758k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Label-free optical biosensors based on integrated photonic devices have demonstrated sensitive and selective detection of biological analytes. Integrating these sensor platforms into microfluidic devices reduces the required sample volume and enables rapid delivery of sample to the sensor surface, thereby improving response times. Conventionally, these devices are embedded in or adjacent to the substrate; therefore, the effective sensing area lies within the slow-flow region at the floor of the channel, reducing the efficiency of sample delivery. Recently, a suspended waveguide sensor was developed in which the device is elevated off of the substrate and the sensing region does not rest on the substrate. This geometry places the sensing region in the middle of the parabolic velocity profile, reduces the distance that a particle must travel by diffusion to be detected, and allows binding to both surfaces of the sensor. We use a finite element model to simulate advection, diffusion, and specific binding of interleukin 6, a signaling protein, to this waveguide-based biosensor at a range of elevations within a microfluidic channel. We compare the transient performance of these suspended waveguide sensors with that of traditional planar devices, studying both the detection threshold response time and the time to reach equilibrium. We also develop a theoretical framework for predicting the behavior of these suspended sensors. These simulation and theoretical results provide a roadmap for improving sensor performance and minimizing the amount of sample required to make measurements.
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Guha S, Wayment JR, Li M, Tarlov MJ, Zachariah MR. Protein adsorption–desorption on electrospray capillary walls – No influence on aggregate distribution. J Colloid Interface Sci 2012; 377:476-84. [DOI: 10.1016/j.jcis.2012.03.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 03/19/2012] [Accepted: 03/20/2012] [Indexed: 02/02/2023]
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Kang H, Clarke ML, Lacerda SHDP, Karim A, Pease LF, Hwang J. Multimodal optical studies of single and clustered colloidal quantum dots for the long-term optical property evaluation of quantum dot-based molecular imaging phantoms. BIOMEDICAL OPTICS EXPRESS 2012; 3:1312-25. [PMID: 22741078 PMCID: PMC3370972 DOI: 10.1364/boe.3.001312] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/20/2012] [Accepted: 04/20/2012] [Indexed: 05/04/2023]
Abstract
Understanding the optical properties of clustered quantum dots (QDs) is essential to the design of QD-based optical phantoms for molecular imaging. Single and clustered core/shell colloidal QDs of dimers, trimers, and tetramers are self-assembled, separated, and preferentially collected using electrospray differential mobility analysis (ES-DMA) with electrostatic deposition. Multimodal optical characterization and analysis of their dynamical photoluminescence (PL) properties enables the long-term evaluation of the physicochemical and optical properties of QDs in a single or a clustered state. A multimodal time-correlated spectroscopic confocal microscope capable of simultaneously measuring the time evolution of PL intensity fluctuation, PL lifetime, and emission spectra reveals the long-term dynamic optical properties of interacting QDs in individual dimeric clusters of QDs. This new method will benefit research into the quantitative interpretation of fluorescence intensity and lifetime results in QD-based molecular imaging techniques. The process of photooxidation leads to coupling of the QDs in a dimer, leading to unique optical properties when compared to an isolated QD. These results guide the design and evaluation of QD-based phantom materials for the validation of the PL measurements for quantitative molecular imaging of biological samples labeled with QD probes.
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Affiliation(s)
- HyeongGon Kang
- Radiation and Biomolecular Physics Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Matthew L. Clarke
- Radiation and Biomolecular Physics Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Silvia H. De Paoli Lacerda
- Center for Biologics Evaluation and Research, Food and Drug Administration (FDA), Bethesda, MD 20892, USA
| | - Alamgir Karim
- Poymers Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
- Current Address: College of Polymer Science and Polymer Engineering, Goodyear Polymer Center, The University of Akron, Akron, OH 44325, USA
| | - Leonard F. Pease
- Departments of Chemical Engineering, Pharmaceutics & Pharmaceutical Chemistry, and Internal Medicine, University of Utah, Salt Lake City, UT 84112, USA
| | - Jeeseong Hwang
- Radiation and Biomolecular Physics Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
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