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Schmidt C, Schierack P, Gerber U, Schröder C, Choi Y, Bald I, Lehmann W, Rödiger S. Streptavidin Homologues for Applications on Solid Surfaces at High Temperatures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:628-636. [PMID: 31895565 DOI: 10.1021/acs.langmuir.9b02339] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
One of the most commonly used bonds between two biomolecules is the bond between biotin and streptavidin (SA) or streptavidin homologues (SAHs). A high dissociation constant and the consequent high-temperature stability even allows for its use in nucleic acid detection under polymerase chain reaction (PCR) conditions. There are a number of SAHs available, and for assay design, it is of great interest to determine as to which SAH will perform the best under assay conditions. Although there are numerous single studies on the characterization of SAHs in solution or selected solid phases, there is no systematic study comparing different SAHs for biomolecule-binding, hybridization, and PCR assays on solid phases. We compared streptavidin, core streptavidin, traptavidin, core traptavidin, neutravidin, and monomeric streptavidin on the surface of microbeads (10-15 μm in diameter) and designed multiplex microbead-based experiments and analyzed simultaneously the binding of biotinylated oligonucleotides and the hybridization of oligonucleotides to complementary capture probes. We also bound comparably large DNA origamis to capture probes on the microbead surface. We used a real-time fluorescence microscopy imaging platform, with which it is possible to subject samples to a programmable time and temperature profile and to record binding processes on the microbead surface depending on the time and temperature. With the exception of core traptavidin and monomeric streptavidin, all other SA/SAHs were suitable for our investigations. We found hybridization efficiencies close to 100% for streptavidin, core streptavidin, traptavidin, and neutravidin. These could all be considered equally suitable for hybridization, PCR applications, and melting point analysis. The SA/SAH-biotin bond was temperature-sensitive when the oligonucleotide was mono-biotinylated, with traptavidin being the most stable followed by streptavidin and neutravidin. Mono-biotinylated oligonucleotides can be used in experiments with temperatures up to 70 °C. When oligonucleotides were bis-biotinylated, all SA/SAH-biotin bonds had similar temperature stability under PCR conditions, even if they comprised a streptavidin variant with slower biotin dissociation and increased mechanostability.
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Affiliation(s)
- Carsten Schmidt
- Faculty of Environment and Natural Sciences, Institute of Biotechnology , Brandenburg University of Technology Cottbus-Senftenberg , Universitätsplatz 1 , D-01968 Senftenberg , Germany
| | - Peter Schierack
- Faculty of Environment and Natural Sciences, Institute of Biotechnology , Brandenburg University of Technology Cottbus-Senftenberg , Universitätsplatz 1 , D-01968 Senftenberg , Germany
| | - Ulrike Gerber
- Faculty of Environment and Natural Sciences, Institute of Biotechnology , Brandenburg University of Technology Cottbus-Senftenberg , Universitätsplatz 1 , D-01968 Senftenberg , Germany
| | - Christian Schröder
- Faculty of Environment and Natural Sciences, Institute of Biotechnology , Brandenburg University of Technology Cottbus-Senftenberg , Universitätsplatz 1 , D-01968 Senftenberg , Germany
| | - Youngeun Choi
- Optical Spectroscopy and Chemical Imaging, Institute of Chemistry , University of Potsdam , Karl-Liebknecht-Straße 24-25, Building 29 , D-14476 Potsdam , Germany
- Division 1-Analytical Chemistry and Reference Materials , BAM Federal Institute for Materials Research and Testing , Richard-Willstätter Str. 11 , 12489 Berlin , Germany
| | - Ilko Bald
- Optical Spectroscopy and Chemical Imaging, Institute of Chemistry , University of Potsdam , Karl-Liebknecht-Straße 24-25, Building 29 , D-14476 Potsdam , Germany
- Division 1-Analytical Chemistry and Reference Materials , BAM Federal Institute for Materials Research and Testing , Richard-Willstätter Str. 11 , 12489 Berlin , Germany
| | - Werner Lehmann
- Attomol GmbH , Schulweg 6 , D-03205 Bronkow , Lipten, Germany
| | - Stefan Rödiger
- Faculty of Environment and Natural Sciences, Institute of Biotechnology , Brandenburg University of Technology Cottbus-Senftenberg , Universitätsplatz 1 , D-01968 Senftenberg , Germany
- Faculty of Health Sciences , Joint Faculty of the Brandenburg University of Technology Cottbus-Senftenberg, The Brandenburg Medical School Theodor Fontane and The University of Potsdam , D-01968 Senftenberg , Germany
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2
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Kamperman T, Koerselman M, Kelder C, Hendriks J, Crispim JF, de Peuter X, Dijkstra PJ, Karperien M, Leijten J. Spatiotemporal material functionalization via competitive supramolecular complexation of avidin and biotin analogs. Nat Commun 2019; 10:4347. [PMID: 31554812 PMCID: PMC6761202 DOI: 10.1038/s41467-019-12390-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 09/05/2019] [Indexed: 12/21/2022] Open
Abstract
Spatiotemporal control over engineered tissues is highly desirable for various biomedical applications as it emulates the dynamic behavior of natural tissues. Current spatiotemporal biomaterial functionalization approaches are based on cytotoxic, technically challenging, or non-scalable chemistries, which has hampered their widespread usage. Here we report a strategy to spatiotemporally functionalize (bio)materials based on competitive supramolecular complexation of avidin and biotin analogs. Specifically, an injectable hydrogel is orthogonally post-functionalized with desthiobiotinylated moieties using multivalent neutravidin. In situ exchange of desthiobiotin by biotin enables spatiotemporal material functionalization as demonstrated by the formation of long-range, conformal, and contra-directional biochemical gradients within complex-shaped 3D hydrogels. Temporal control over engineered tissue biochemistry is further demonstrated by timed presentation and sequestration of growth factors using desthiobiotinylated antibodies. The method's universality is confirmed by modifying hydrogels with biotinylated fluorophores, peptides, nanoparticles, enzymes, and antibodies. Overall, this work provides a facile, cytocompatible, and universal strategy to spatiotemporally functionalize materials.
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Affiliation(s)
- Tom Kamperman
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands.
| | - Michelle Koerselman
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Cindy Kelder
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Jan Hendriks
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - João F Crispim
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Xandra de Peuter
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Pieter J Dijkstra
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Marcel Karperien
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands
| | - Jeroen Leijten
- Faculty of Science and Technology, Technical Medical Centre, Department of Developmental BioEngineering, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands.
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3
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Menzi M, Wild B, Pradère U, Malinowska AL, Brunschweiger A, Lightfoot HL, Hall J. Towards Improved Oligonucleotide Therapeutics Through Faster Target Binding Kinetics. Chemistry 2017; 23:14221-14230. [PMID: 28746731 DOI: 10.1002/chem.201701670] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Indexed: 01/19/2023]
Abstract
When used as inhibitors of gene expression in vivo, oligonucleotides require modification of their structures to boost their binding affinity for complementary target RNAs. To date, hundreds of modifications have been designed and tested but few have proven to be useful. Among those investigated are mono- and polyamino-groups. These are positively charged at physiological pH and have been appended to oligonucleotides in an effort to reduce electrostatic repulsion during hybridization to RNAs, but have generally shown relatively minor benefits to binding. We conjugated spermine to uracils in oligonucleotides via a triazole linker so that the polyamine fits in the major groove of a subsequently formed RNA-duplex. The modifications produced large increases in target-binding affinity of the oligonucleotides. Using surface plasmon resonance-based assays, we showed that the increases derived mainly from faster annealing (kon ). We propose that the spermine fragments play a similar role to that of natural polyamines during oligonucleotide-target interactions in cells, and may be advantageous for oligonucleotides that operate catalytic mechanisms.
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Affiliation(s)
- Mirjam Menzi
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
| | - Bettina Wild
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
| | - Ugo Pradère
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
| | - Anna L Malinowska
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
| | - Andreas Brunschweiger
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 6, 44227, Dortmund, Germany
| | - Helen L Lightfoot
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
| | - Jonathan Hall
- Institute of Pharmaceutical Sciences, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland
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4
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Mendez-Gonzalez D, Laurenti M, Latorre A, Somoza A, Vazquez A, Negredo AI, López-Cabarcos E, Calderón OG, Melle S, Rubio-Retama J. Oligonucleotide Sensor Based on Selective Capture of Upconversion Nanoparticles Triggered by Target-Induced DNA Interstrand Ligand Reaction. ACS APPLIED MATERIALS & INTERFACES 2017; 9:12272-12281. [PMID: 28332400 PMCID: PMC5391500 DOI: 10.1021/acsami.7b00575] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 03/23/2017] [Indexed: 05/20/2023]
Abstract
We present a sensor that exploits the phenomenon of upconversion luminescence to detect the presence of specific sequences of small oligonucleotides such as miRNAs among others. The sensor is based on NaYF4:Yb,Er@SiO2 nanoparticles functionalized with ssDNA that contain azide groups on the 3' ends. In the presence of a target sequence, interstrand ligation is possible via the click-reaction between one azide of the upconversion probe and a DBCO-ssDNA-biotin probe present in the solution. As a result of this specific and selective process, biotin is covalently attached to the surface of the upconversion nanoparticles. The presence of biotin on the surface of the nanoparticles allows their selective capture on a streptavidin-coated support, giving a luminescent signal proportional to the amount of target strands present in the test samples. With the aim of studying the analytical properties of the sensor, total RNA samples were extracted from healthy mosquitoes and were spiked-in with a specific target sequence at different concentrations. The result of these experiments revealed that the sensor was able to detect 10-17 moles per well (100 fM) of the target sequence in mixtures containing 100 ng of total RNA per well. A similar limit of detection was found for spiked human serum samples, demonstrating the suitability of the sensor for detecting specific sequences of small oligonucleotides under real conditions. In contrast, in the presence of noncomplementary sequences or sequences having mismatches, the luminescent signal was negligible or conspicuously reduced.
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Affiliation(s)
- Diego Mendez-Gonzalez
- Department of Physical
Chemistry II, Faculty of Pharmacy, Complutense
University of Madrid, 28040 Madrid, Spain
| | - Marco Laurenti
- Department of Physical
Chemistry II, Faculty of Pharmacy, Complutense
University of Madrid, 28040 Madrid, Spain
| | - Alfonso Latorre
- Nanobiotecnología
(IMDEA-Nanociencia), Unidad Asociada al
Centro Nacional de Biotecnología (CSIC), 28049 Madrid, Spain
| | - Alvaro Somoza
- Nanobiotecnología
(IMDEA-Nanociencia), Unidad Asociada al
Centro Nacional de Biotecnología (CSIC), 28049 Madrid, Spain
| | - Ana Vazquez
- Laboratorio de Arbovirus, Centro
Nacional de Microbiología-Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Ana Isabel Negredo
- Laboratorio de Arbovirus, Centro
Nacional de Microbiología-Instituto de Salud Carlos III, Majadahonda, 28220 Madrid, Spain
| | - Enrique López-Cabarcos
- Department of Physical
Chemistry II, Faculty of Pharmacy, Complutense
University of Madrid, 28040 Madrid, Spain
| | - Oscar G. Calderón
- Faculty of Optics and Optometry, Complutense
University of Madrid, Arcos de Jalón 118, 28037 Madrid, Spain
| | - Sonia Melle
- Faculty of Optics and Optometry, Complutense
University of Madrid, Arcos de Jalón 118, 28037 Madrid, Spain
- E-mail: (S.M.)
| | - Jorge Rubio-Retama
- Department of Physical
Chemistry II, Faculty of Pharmacy, Complutense
University of Madrid, 28040 Madrid, Spain
- E-mail: (J.R.-R.)
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5
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D'Agata R, Palladino P, Spoto G. Streptavidin-coated gold nanoparticles: critical role of oligonucleotides on stability and fractal aggregation. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:1-11. [PMID: 28144559 PMCID: PMC5238629 DOI: 10.3762/bjnano.8.1] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 12/08/2016] [Indexed: 05/12/2023]
Abstract
Gold nanoparticles (AuNPs) exhibit unique properties that can be modulated through a tailored surface functionalization, enabling their targeted use in biochemical sensing and medical diagnostics. In particular, streptavidin-modified AuNPs are increasingly used for biosensing purposes. We report here a study of AuNPs surface-functionalized with streptavidin-biotinylated oligonucleotide, focussing on the role played by the oligonucleotide probes in the stabilization/destabilization of the functionalized nanoparticle dispersion. The behaviour of the modified AuNP dispersion as a consequence of the competitive displacement of the biotinylated oligonucleotide has been investigated and the critical role of displaced oligonucletides in triggering the quasi one-dimensional aggregation of nanoparticles is demonstrated for the first time. The thorough understanding of the fundamental properties of bioconjugated AuNPs is of great importance for the design of highly sensitive and reliable functionalized AuNP-based assays.
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Affiliation(s)
- Roberta D'Agata
- Consorio Interuniversitario “Istituto Nazionale Biostrutture e Biosistemi”, c/o Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, I-95125, Catania, Italy
| | - Pasquale Palladino
- Consorio Interuniversitario “Istituto Nazionale Biostrutture e Biosistemi”, c/o Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, I-95125, Catania, Italy
| | - Giuseppe Spoto
- Consorio Interuniversitario “Istituto Nazionale Biostrutture e Biosistemi”, c/o Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, I-95125, Catania, Italy
- Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, I-95125, Catania, Italy
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6
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Stephan M, Kramer C, Steinem C, Janshoff A. Binding assay for low molecular weight analytes based on reflectometry of absorbing molecules in porous substrates. Analyst 2015; 139:1987-92. [PMID: 24599267 DOI: 10.1039/c4an00009a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Small molecule sensing is of great importance in pharmaceutical research. While there exist well established screening methods such as EMSA (electrophoretic motility shift assay) or biointeraction chromatography to report on successful binding interactions, there are only a few techniques that allow studying and quantifying the interaction of low molecular weight analytes with a binding partner directly. We report on a binding assay for small molecules based on the reflectivity change of a porous transparent film upon immobilisation of an absorbing substance on the pore walls. The porous matrix acts as a thin optical transparent film to produce interference fringes and accumulates molecules at the inner wall to amplify the sensor response. The benefits and limits of the assay are demonstrated by investigating the binding of biotin labelled with an atto dye to avidin physisorbed within an anodic aluminium oxide membrane.
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Affiliation(s)
- Milena Stephan
- Department of Physical Chemistry, Georg-August University, Göttingen, Germany.
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7
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Mavrogiannopoulou E, Petrou PS, Koukouvinos G, Yannoukakos D, Siafaka-Kapadai A, Fornal K, Awsiuk K, Budkowski A, Kakabakos SE. Improved DNA microarray detection sensitivity through immobilization of preformed in solution streptavidin/biotinylated oligonucleotide conjugates. Colloids Surf B Biointerfaces 2015; 128:464-472. [PMID: 25805150 DOI: 10.1016/j.colsurfb.2015.02.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 02/24/2015] [Accepted: 02/25/2015] [Indexed: 11/18/2022]
Abstract
A novel immobilization approach involving binding of preformed streptavidin/biotinylated oligonucleotide conjugates onto surfaces coated with biotinylated bovine serum albumin is presented. Microarrays prepared according to the proposed method were compared, in terms of detection sensitivity and specificity, with other immobilization schemes employing coupling of biotinylated oligonucleotides onto directly adsorbed surface streptavidin, or sequential coupling of streptavidin and biotinylated oligonucleotides onto a layer of adsorbed biotinylated bovine serum albumin. A comparison was performed employing biotinylated oligonucleotides corresponding to wild- and mutant-type sequences of seven single point mutations of the BRCA1 gene. With respect to the other immobilization protocols, the proposed oligonucleotide immobilization approach offered the highest hybridization signals (at least 5 times higher) and permitted more elaborative washings, thus providing considerably higher discrimination between complimentary and non-complementary DNA sequences for all mutations tested. In addition, the hybridization kinetics were significantly enhanced compared to two other immobilization protocols, permitting PCR sample analysis in less than 40 min. Thus, the proposed oligonucleotide immobilization approach offered improved detection sensitivity and discrimination ability along with considerably reduced analysis time, and it is expected to find wide application in DNA mutation detection.
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Affiliation(s)
- E Mavrogiannopoulou
- Immunoassay/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR "Demokritos", GR-15310 Aghia Paraskevi, Greece
| | - P S Petrou
- Immunoassay/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR "Demokritos", GR-15310 Aghia Paraskevi, Greece
| | - G Koukouvinos
- Immunoassay/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR "Demokritos", GR-15310 Aghia Paraskevi, Greece
| | - D Yannoukakos
- Molecular Diagnostics Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR "Demokritos", GR-15310 Aghia Paraskevi, Greece
| | - A Siafaka-Kapadai
- Biochemistry Lab, Department of Chemistry, University of Athens, GR-15771 Panepistimiopolis, Athens, Greece
| | - K Fornal
- M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - K Awsiuk
- M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - A Budkowski
- M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - S E Kakabakos
- Immunoassay/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, NCSR "Demokritos", GR-15310 Aghia Paraskevi, Greece.
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8
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Abstract
Abstract
This work compiles information on the principles of diagnostic immunochemical methods and the recent advances in this field. It presents an overview of modern techniques for the production of diagnostic antibodies, their modification with the aim of improving their diagnostic potency, the different types of immunochemical detection systems, and the increasing diagnostic applications for human health that include specific disease markers, individualized diagnosis of cancer subtypes, therapeutic and addictive drugs, food residues, and environmental contaminants. A special focus lies in novel developments of immunosensor techniques, promising approaches to miniaturized detection units and the associated microfluidic systems. The trends towards high-throughput systems, multiplexed analysis, and miniaturization of the diagnostic tools are discussed. It is also made evident that progress in the last few years has largely relied on novel chemical approaches.
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9
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Zhu S, Panne U, Rurack K. A rapid method for the assessment of the surface group density of carboxylic acid-functionalized polystyrene microparticles. Analyst 2013; 138:2924-30. [PMID: 23531901 DOI: 10.1039/c3an36578f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Particle-based assays are becoming versatile analytical tools due to their cost-effectiveness, speed, straightforward and diverse functionalization chemistries, especially when polystyrene particles are used. The introduction of functional groups (-COOH, -NH2, etc.) to the surface of such polystyrene particles promotes their application in bioanalytics. However, the traditional method to determine the amount of surface carboxylate groups is conductivity titration, which is usually time- and resources-consuming and discontinuous. Here, we synthesized polystyrene microparticles with different contents of carboxylate groups, and then investigated a simpler and potentially continuous approach to determine the amount of surface carboxylate groups by Zeta potential measurements. The results were compared to the traditional titration method and to actual coupling efficiencies of the functionalized particles with a model oligonucleotide probe as determined by flow cytometry. All quantification methods revealed good agreement.
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Affiliation(s)
- Shengchao Zhu
- Abt. 1 Analytische Chemie, Referenzmaterialien, BAM Bundesanstalt für Materialforschung und -prüfung, Richard-Willstätter-Str. 11, D-12489 Berlin, Germany
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10
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Rebhan MAE, Brunschweiger A, Hall J. Measurement by SPR of Very Low Dissociation Rates: Oxidation-Mediated Loss of Biotin-Streptavidin Affinity. Chembiochem 2013; 14:2091-4. [DOI: 10.1002/cbic.201300468] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Indexed: 12/17/2022]
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11
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Ma DL, He HZ, Chan DSH, Leung CH. Simple DNA-based logic gates responding to biomolecules and metal ions. Chem Sci 2013. [DOI: 10.1039/c3sc50924a] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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12
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Lin MY, Ho FH, Yang CY, Yeh JA, Yang YS. Functionalization, re-functionalization and rejuvenation of ssDNA nanotemplates. Chem Commun (Camb) 2012; 48:4902-4. [PMID: 22499154 DOI: 10.1039/c2cc30748k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-stranded DNA (ssDNA) with repetitive sequence was demonstrated to be a versatile nanotemplate for introducing biological activity in a self-assembled manner. Re-functionalization and rejuvenation of the ssDNA nanotemplate were achieved under mild biological conditions without using high temperature and strong alkaline treatment to denature DNA.
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Affiliation(s)
- Ming-Yu Lin
- Institute of Molecular Medicine and Bioengineering, National Chiao Tung University, Hsinchu, Taiwan
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13
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Zhang Y, Wang TH. Micro Magnetic Gyromixer for Speeding up Reactions in Droplets. MICROFLUIDICS AND NANOFLUIDICS 2012; 12:787-794. [PMID: 22707926 PMCID: PMC3374403 DOI: 10.1007/s10404-011-0922-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We report a novel micro magnetic gyromixer designed for accelerating mixing hence reactions in droplets. The gyromixer is fabricated with magnetite-PDMS composite using soft lithography. The mixer spins and balances itself on the droplet surface through the gyroscopic effect, rapidly homogenizing the enclosed reagents by stretching and folding internal fluid streamlines to enhance mixing. We examined the capability of the gyromixer for improving biochemical reactions in droplets by monitoring the biotin-streptavidin binding as a linker in a quantum dot fluorescence resonant energy transfer (QD-FRET) sensing system. The remotely controlled gyromixer exhibits high flexibility and potential for integration in a variety of droplet-based miniaturized total analysis systems (μTAS) to reduce turnaround times.
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Affiliation(s)
- Yi Zhang
- Department of Biomedical Engineering, Johns Hopkins University. Clark 122, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Tza-Huei Wang
- Department of Mechanical Engineering, Department of Biomedical Engineering, Sidney Kimmel Comprehensive Cancer Center, Center of Cancer Nanotechnology Excellence at Johns Hopkins, Johns Hopkins University, Latrobe 108, 3400 North Charles Street, Baltimore, MD 21218, USA
- Correspondence should be addressed to Dr. Tza-Huei (Jeff) Wang Tel: 410-516-7086
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