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Presnova GV, Zhdanov GA, Filatova LY, Ulyashova MM, Presnov DE, Rubtsova MY. Improvement of Seed-Mediated Growth of Gold Nanoparticle Labels for DNA Membrane-Based Assays. BIOSENSORS 2022; 13:2. [PMID: 36671837 PMCID: PMC9855534 DOI: 10.3390/bios13010002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 12/03/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Gold nanoparticles (AuNPs) are popular labels for colorimetric detection of various analytes, involving proteins, nucleic acids, viruses, and whole cells because of their outstanding optical properties, inertness, and modification variability. In this work, we present an improved approach for enhancement of color intensity for DNA membrane microarrays based on seed-mediated growth of AuNP labels. Biotin-labeled DNA is hybridized with capture oligonucleotide probes immobilized on the microarrays. Then biotin is revealed by a streptavidin-AuNP conjugate followed by the detection of AuNPs. Optimization of seed-mediated enlargement of AuNPs by the reduction of tetrachloroauric acid with hydroxylamine made it possible to change the coloring of specific spots on the microarrays from pink to a more contrasting black with minor background staining. Mean size of the resulting AuNPs was four times larger than before the enhancement. Adjusting the pH of HAuCl4 solution to 3.5 and use of a large excess of hydroxylamine increased the signal/background ratio by several times. The method's applicability was demonstrated for quantification of a short oligonucleotide of 19 bases and full-length TEM-type β-lactamase genes of 860 bp responsible for the development of bacterial resistance against β-lactam antibiotics. Improved protocol for AuNP enlargement may be further transferred to any other membrane-based assays of nucleic acids with both instrumental and visual colorimetric detection.
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Affiliation(s)
- Galina V. Presnova
- Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Gleb A. Zhdanov
- Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Luibov Yu. Filatova
- Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Mariya M. Ulyashova
- Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Denis E. Presnov
- D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
- MSU Quantum Technology Centre, 119991 Moscow, Russia
- Cryoelectronics Lab, Faculty of Physics, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Maya Yu. Rubtsova
- Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
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2
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Information Visualisation for Antibiotic Detection Biochip Design and Testing. Processes (Basel) 2022. [DOI: 10.3390/pr10122680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Biochips are engineered substrates that have different spots that change colour according to biochemical reactions. These spots can be read together to detect different analytes (such as different types of antibiotic, pathogens, or biological agents). While some chips are designed so that each spot on its own can detect a particular analyte, chip designs that use a combination of spots to detect different analytes can be more efficient and detect a larger number of analytes with a smaller number of spots. These types of chip can, however, be more difficult to design, as an efficient and effective combination of biosensors needs to be selected for the chip. These need to be able to differentiate between a range of different analytes so the values can be combined in a way that demonstrates the confidence that a particular analyte is present or not. The study described in this paper examines the potential for information visualisation to support the process of designing and reading biochips by developing and evaluating applications that allow biologists to analyse the results of experiments aimed at detecting candidate bio-sensors (to be used as biochip spots) and examining how biosensors can combine to identify different analytes. Our results demonstrate the potential of information visualisation and machine learning techniques to improve the design of biochips.
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3
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Parween S, Asthana A, Nahar P. Fundamentals of Image-Based Assay (IBA) System for Affordable Point of Care Diagnostics. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Hou P, Deng R, Guo J, Chen W, Li X, Yu HZ. A WiFi scanner in conjunction with disposable multiplex paper assay for the quantitation of disease markers in blood plasma. Anal Bioanal Chem 2021; 413:4625-4634. [PMID: 33661349 DOI: 10.1007/s00216-021-03234-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/05/2021] [Accepted: 02/10/2021] [Indexed: 12/30/2022]
Abstract
Herein we report a quantitative, multiplex assay for disease markers in plasma based on an integrated setup of a portable scanner and a disposable paper-based analytical device (PAD). The quantitative analysis relies on the digital colorimetric reading of the three-layer PAD with 30 assay sites for performing respective chromogenic reactions for plasma uric acid, glucose, and triglyceride, which are considered as important risk factors for cardiovascular diseases. A portable scanner with WiFi transmission capability was used to produce high-quality color images of the PADs and wirelessly transfer them to a smartphone or other mobile devices for data processing. The concentrations of biomarkers in both standard solutions and plasma samples can be directly obtained using a custom-designed smartphone app that is also capable of constructing calibration curves. The detection limits of uric acid, glucose, and triglyceride were determined to be 0.50 mg/dL, 0.84 mmol/L, and 14 mg/dL, respectively, which are below the normal limits and adequate for clinical validation. Owing to the distinct advantages-simple, portable, and cost-effective-this mobile assay protocol can be used for point-of-care (POC) settings or resource-limited situations, and potentially for the diagnosis and prevention of infectious diseases.
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Affiliation(s)
- Pengfei Hou
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Rong Deng
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Jiqiang Guo
- Shanxi Bethune Hospital, Taiyuan, 030032, Shanxi, China
| | - Weiyi Chen
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Xiaochun Li
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China.
| | - Hua-Zhong Yu
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China.
- Department of Chemistry and Department of Molecular Biology & Biochemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
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5
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Wiederoder MS, Kendall E, Han JH, Ulrich R, DeVoe DL. Flow-through microfluidic immunosensors with refractive index-matched silica monoliths as volumetric optical detection elements. SENSORS AND ACTUATORS. B, CHEMICAL 2018; 254:878-886. [PMID: 29225421 PMCID: PMC5716804 DOI: 10.1016/j.snb.2017.07.137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A sensitive and rapid absorbance based immunosensor that utilizes ex situ functionalized porous silica monoliths as volumetric optical detection elements is demonstrated in this study. The porous monolith structure facilitates high capture probe density and short diffusion length scales, enabling sensitive and rapid assays. Silica monoliths, synthesized and functionalized with immunocapture probes off-chip before integration into a sealed thermoplastic microfluidic device, serve to capture target antigens during perfusion through the porous structure. Gold nanoparticle immunoconjugates are combined with silver enhancement to create microscale silver clusters, followed by perfusion of an aqueous sucrose solution to limit light scattering and enhance optical signal. Using this approach, detection limits as low as 1 ng/mL are achieved for a sandwich assay, with a dynamic range of at least 4 logs. The results confirm that the combination of on-chip index matching with functionalized porous silica monoliths can enables simple and practical flow-through immunoassays for the sensitive and rapid detection of target antigens.
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Affiliation(s)
- M. S. Wiederoder
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland, USA
| | - E.L. Kendall
- Department of Mechanical Engineering, University of Maryland, College Park, Maryland, USA
| | - J.-H. Han
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, Maryland, USA
| | - R.G. Ulrich
- Molecular and Translational Sciences, United States Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, Maryland, USA
| | - D. L. DeVoe
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland, USA
- Department of Mechanical Engineering, University of Maryland, College Park, Maryland, USA
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6
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Wiederoder MS, Smith S, Madzivhandila P, Mager D, Moodley K, DeVoe DL, Land KJ. Novel functionalities of hybrid paper-polymer centrifugal devices for assay performance enhancement. BIOMICROFLUIDICS 2017; 11:054101. [PMID: 28966698 PMCID: PMC5595585 DOI: 10.1063/1.5002644] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 08/31/2017] [Indexed: 05/11/2023]
Abstract
The presented work demonstrates novel functionalities of hybrid paper-polymer centrifugal devices for assay performance enhancement that leverage the advantages of both paper-based and centrifugal microfluidic platforms. The fluid flow is manipulated by balancing the capillary force of paper inserts with the centrifugal force generated by disc rotation to enhance the signal of a colorimetric lateral flow immunoassay for pathogenic E. coli. Low-cost centrifugation for pre-concentration of bacteria was demonstrated by sample sedimentation at high rotational speeds before supernatant removal by a paper insert via capillary force after deceleration. The live bacteria capture efficiency of the device was similar to a commercial centrifuge. This pre-concentrated sample when combined with gold nanoparticle immunoconjugate probes resulted in a detection limit that is 10× lower than a non-concentrated sample for a lateral flow immunoassay. Signal enhancement was also demonstrated through rotational speed variation to prevent the flow for on-device incubation and to reduce the flow rate, thus increasing the sample residence time for the improved capture of gold nanoparticle-bacteria complexes in an integrated paper microfluidic assay. Finally, multiple sequential steps including sample pre-concentration, filtration, incubation, target capture by an integrated paper microfluidic assay, silver enhancement and quenching, and index matching were completed within a single device. The detection limit was 105 colony forming units per ml, a 100× improvement over a similar paper-based lateral flow assay. The techniques utilize the advantages of paper-based microfluidic devices, while facilitating additional functionalities with a centrifugal microfluidic platform for detection performance enhancement in a low-cost, automated platform amenable to point-of-care environments.
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Affiliation(s)
| | - S Smith
- Council for Scientific and Industrial Research, Pretoria, South Africa
| | - P Madzivhandila
- Council for Scientific and Industrial Research, Pretoria, South Africa
| | - D Mager
- Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - K Moodley
- Council for Scientific and Industrial Research, Pretoria, South Africa
| | - D L DeVoe
- University of Maryland, College Park, Maryland 20742, USA
| | - K J Land
- Council for Scientific and Industrial Research, Pretoria, South Africa
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7
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Chen JL. Determination of tetracycline using imprinted polymethacrylates along with fluorescent CdTe quantum dots on plastic substrates. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2118-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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8
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Sauer U. Analytical Protein Microarrays: Advancements Towards Clinical Applications. SENSORS (BASEL, SWITZERLAND) 2017; 17:E256. [PMID: 28146048 PMCID: PMC5335935 DOI: 10.3390/s17020256] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/13/2017] [Accepted: 01/23/2017] [Indexed: 01/28/2023]
Abstract
Protein microarrays represent a powerful technology with the potential to serve as tools for the detection of a broad range of analytes in numerous applications such as diagnostics, drug development, food safety, and environmental monitoring. Key features of analytical protein microarrays include high throughput and relatively low costs due to minimal reagent consumption, multiplexing, fast kinetics and hence measurements, and the possibility of functional integration. So far, especially fundamental studies in molecular and cell biology have been conducted using protein microarrays, while the potential for clinical, notably point-of-care applications is not yet fully utilized. The question arises what features have to be implemented and what improvements have to be made in order to fully exploit the technology. In the past we have identified various obstacles that have to be overcome in order to promote protein microarray technology in the diagnostic field. Issues that need significant improvement to make the technology more attractive for the diagnostic market are for instance: too low sensitivity and deficiency in reproducibility, inadequate analysis time, lack of high-quality antibodies and validated reagents, lack of automation and portable instruments, and cost of instruments necessary for chip production and read-out. The scope of the paper at hand is to review approaches to solve these problems.
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Affiliation(s)
- Ursula Sauer
- AIT Austrian Institute of Technology GmbH, Center for Health and Bioresources, 3430 Tulln, Austria.
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9
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Wiederoder MS, Peterken L, Lu AX, Rahmanian OD, Raghavan SR, DeVoe DL. Optical detection enhancement in porous volumetric microfluidic capture elements using refractive index matching fluids. Analyst 2015; 140:5724-31. [PMID: 26160546 PMCID: PMC4516631 DOI: 10.1039/c5an00988j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Porous volumetric capture elements in microfluidic sensors are advantageous compared to planar capture surfaces due to higher reaction site density and decreased diffusion lengths that can reduce detection limits and total assay time. However a mismatch in refractive indices between the capture matrix and fluid within the porous interstices results in scattering of incident, reflected, or emitted light, significantly reducing the signal for optical detection. Here we demonstrate that perfusion of an index-matching fluid within a porous matrix minimizes scattering, thus enhancing optical signal by enabling the entire capture element volume to be probed. Signal enhancement is demonstrated for both fluorescence and absorbance detection, using porous polymer monoliths in a silica capillary and packed beds of glass beads within thermoplastic microchannels, respectively. Fluorescence signal was improved by a factor of 3.5× when measuring emission from a fluorescent compound attached directly to the polymer monolith, and up to 2.6× for a rapid 10 min direct immunoassay. When combining index matching with a silver enhancement step, a detection limit of 0.1 ng mL(-1) human IgG and a 5 log dynamic range was achieved. The demonstrated technique provides a simple method for enhancing optical sensitivity for a wide range of assays, enabling the full benefits of porous detection elements in miniaturized analytical systems to be realized.
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Affiliation(s)
- M. S. Wiederoder
- Department of Bioengineering, University of Maryland, College Park, Maryland, USA
| | - L. Peterken
- Department of Bioengineering, University of Maryland, College Park, Maryland, USA
| | - A. X. Lu
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland, USA
| | - O. D. Rahmanian
- Department of Bioengineering, University of Maryland, College Park, Maryland, USA
| | - S. R. Raghavan
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland, USA
| | - D. L. DeVoe
- Department of Bioengineering, University of Maryland, College Park, Maryland, USA
- Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland, USA
- Department of Mechanical Engineering, University of Maryland, College Park, Maryland, USA
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10
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Abstract
Options for biomedical analysis continue to evolve from many fields of study, employing diverse detection and quantification methods. New technologies in this arena focus on improving the sensitivity of analysis and the speed of testing, as well as producing systems at low cost which can be used on site as a point-of-care device for telemedicine applications. In this article, the most important original experimental platforms as well as current commercial approaches to biomedical analysis are critically chosen and reviewed, covering January 2010 to January 2014. While literature is quite broad and numerous, there is clear emphasis on biological recognition and imaging for the most impactful works. The analytical approaches are discussed in terms of their utility in diagnostics and biomedical testing.
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Affiliation(s)
- Christine F Woolley
- Chemistry and Biochemistry, Arizona State University, Physical Sciences Building, Room D-102, PO Box 871604, Tempe, Arizona 85287-1604, USA.
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11
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Shi X, Gao X, Zhang L, Li Y, Fan L, Yu HZ. Binary DNA hairpin-based colorimetric biochip for simultaneous detection of Pb2+ and Hg2+ in real-world samples. Analyst 2015; 140:2608-12. [DOI: 10.1039/c5an00120j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel microarray-format colorimetric biochip was constructed for simultaneously detecting the trace amounts of Pb2+ and Hg2+ in various real-world samples.
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Affiliation(s)
- Xiaoli Shi
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Xiaoyi Gao
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Lingling Zhang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Yunchao Li
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Louzhen Fan
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Hua-Zhong Yu
- Department of Chemistry
- Simon Fraser University
- Burnaby
- Canada
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12
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Shi X, Wen J, Li Y, Zheng Y, Zhou J, Li X, Yu HZ. DNA molecular beacon-based plastic biochip: a versatile and sensitive scanometric detection platform. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21788-21797. [PMID: 24852130 DOI: 10.1021/am5007029] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this paper, we report a novel DNA molecular beacon (MB)-based plastic biochip platform for scanometric detection of a range of analytical targets. Hairpin DNA strands, which are dually modified with amino and biotin groups at their two ends are immobilized on a disposable plastic (polycarbonate) substrate as recognition element and gold nanoparticle-assisted silver-staining as signal reading protocol. Initially, the immobilized DNA probes are in their folded forms; upon target binding the hairpin secondary structure of the probe strand is "forced" open (i.e., converted to the unfolded state). Nanogold-streptavidin conjugates can then bind the terminal biotin groups and promote the deposition of rather large silver particles which can be either directly visualized or quantified with a standard flatbed scanner. We demonstrate that with properly designed probe sequences and optimized preparation conditions, a range of molecular targets, such as DNA strands, proteins (thrombin) and heavy metal ions (Hg(2+)), can be detected with high sensitivity and excellent selectivity. The detection can be done in both standard physiological buffers and real world samples. This constitutes a platform technology for performing rapid, sensitive, cost-effective, and point-of-care (POC) chemical analysis and medical diagnosis.
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Affiliation(s)
- Xiaoli Shi
- Department of Chemistry, Beijing Normal University , Beijing 100875, P. R. China
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13
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Wong JXH, Liu FSF, Yu HZ. Mobile App-Based Quantitative Scanometric Analysis. Anal Chem 2014; 86:11966-71. [DOI: 10.1021/ac5035727] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jessica X. H. Wong
- Department of Chemistry and ‡Department of
Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - Frank S. F. Liu
- Department of Chemistry and ‡Department of
Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - Hua-Zhong Yu
- Department of Chemistry and ‡Department of
Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
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14
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Wang Y, Kar A, Paterson A, Kourentzi K, Le H, Ruchhoeft P, Willson R, Bao J. Transmissive Nanohole Arrays for Massively-Parallel Optical Biosensing. ACS PHOTONICS 2014; 1:241-245. [PMID: 25530982 PMCID: PMC4266487 DOI: 10.1021/ph400111u] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Indexed: 06/04/2023]
Abstract
A high-throughput optical biosensing technique is proposed and demonstrated. This hybrid technique combines optical transmission of nanoholes with colorimetric silver staining. The size and spacing of the nanoholes are chosen so that individual nanoholes can be independently resolved in massive parallel using an ordinary transmission optical microscope, and, in place of determining a spectral shift, the brightness of each nanohole is recorded to greatly simplify the readout. Each nanohole then acts as an independent sensor, and the blocking of nanohole optical transmission by enzymatic silver staining defines the specific detection of a biological agent. Nearly 10000 nanoholes can be simultaneously monitored under the field of view of a typical microscope. As an initial proof of concept, biotinylated lysozyme (biotin-HEL) was used as a model analyte, giving a detection limit as low as 0.1 ng/mL.
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Affiliation(s)
- Yanan Wang
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Archana Kar
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Andrew Paterson
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Katerina Kourentzi
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Han Le
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Paul Ruchhoeft
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
| | - Richard Willson
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
- Centro
de Biotecnología FEMSA, Departamento de Biotecnología
e Ingeniería de Alimentos, Tecnológico
de Monterrey, Monterrey, NL 64849, Mexico
| | - Jiming Bao
- Department of Electrical and Computer Engineering and Department of Chemical and Biomolecular
Engineering, University of Houston, Houston, Texas 77204, United States
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15
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Aptamer-functionalized silver nanoparticles for scanometric detection of platelet-derived growth factor-BB. Anal Chim Acta 2013; 812:152-60. [PMID: 24491776 DOI: 10.1016/j.aca.2013.12.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 12/09/2013] [Accepted: 12/18/2013] [Indexed: 12/30/2022]
Abstract
In this work, we reported a scanometric assay system based on the aptamer-functionalized silver nanoparticles (apt-AgNPs) for detection of platelet-derived growth factor-BB (PDGF-BB) protein. The aptamer and ssDNA were bound with silver nanoparticles by self-assembly of sulfhydryl group at 5' end to form the apt-AgNPs probe. The apt-AgNPs probe can catalyze the reduction of metallic ions in color agent to generate metal deposition that can be captured both by human eyes and a flatbed scanner. Two different color agents, silver enhancer solution and color agent 1 (10 mM HAuCl4+2 mM hydroquinone) were used to develop silver and gold shell on the surface of AgNPs separately. The results demonstrated that the formation of Ag core-Au shell structure had some advantages especially in the low concentrations. The apt-AgNPs probe coupled with color agent 1 showed remarkable superiority in both sensitivity and detection limit compared to the apt-AuNPs system. The apt-AgNPs system also produced a wider linear range from 1.56 ng mL(-1) to 100 ng mL(-1) for PDGF-BB with the detection limit lower than 1.56 ng mL(-1). The present strategy was applied to the determination of PDGF-BB in 10% serum, and the results showed that it had good specificity in complex biological media.
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