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Das A, Fehse S, Polack M, Panneerselvam R, Belder D. Surface-Enhanced Raman Spectroscopic Probing in Digital Microfluidics through a Microspray Hole. Anal Chem 2023; 95:1262-1272. [PMID: 36577121 DOI: 10.1021/acs.analchem.2c04053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We report a novel approach for surface-enhanced Raman spectroscopy (SERS) detection in digital microfluidics (DMF). This is made possible by a microspray hole (μSH) that uses an electrostatic spray (ESTAS) for sample transfer from inside the chip to an external SERS substrate. To realize this, a new ESTAS-compatible stationary SERS substrate was developed and characterized for sensitive and reproducible SERS measurements. In a proof-of-concept study, we successfully applied the approach to detect various analyte molecules using the DMF chip and achieved micro-molar detection limits. Moreover, this technique was exemplarily employed to study an organic reaction occurring in the DMF device, providing vibrational spectroscopic data.
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Affiliation(s)
- Anish Das
- Institute of Analytical Chemistry, Leipzig University, Linnéstraße 3, Leipzig 04103, Germany
| | - Sebastian Fehse
- Institute of Analytical Chemistry, Leipzig University, Linnéstraße 3, Leipzig 04103, Germany
| | - Matthias Polack
- Institute of Analytical Chemistry, Leipzig University, Linnéstraße 3, Leipzig 04103, Germany
| | - Rajapandiyan Panneerselvam
- Institute of Analytical Chemistry, Leipzig University, Linnéstraße 3, Leipzig 04103, Germany.,Department of Chemistry, SRM University AP, Amaravati, Andhra Pradesh 522502, India
| | - Detlev Belder
- Institute of Analytical Chemistry, Leipzig University, Linnéstraße 3, Leipzig 04103, Germany
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3
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Sun D, Cao F, Tian Y, Li A, Xu W, Chen Q, Shi W, Xu S. Label-Free Detection of Multiplexed Metabolites at Single-Cell Level via a SERS-Microfluidic Droplet Platform. Anal Chem 2019; 91:15484-15490. [DOI: 10.1021/acs.analchem.9b03294] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Dan Sun
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Fanghao Cao
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
- School of Chemical Engineering and New Energy Materials, Zhuhai College, Jilin University, Zhuhai 519041, P.R. China
| | - Yu Tian
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Aisen Li
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
- College of Physics, Jilin University, Changchun 130012, P.R. China
| | - Weiqing Xu
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
| | - Qidan Chen
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
- School of Chemical Engineering and New Energy Materials, Zhuhai College, Jilin University, Zhuhai 519041, P.R. China
| | - Wei Shi
- Key Lab for Molecular Enzymology & Engineering of Ministry of Education, Jilin University, Changchun 130012, P.R. China
| | - Shuping Xu
- State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, Jilin University, Changchun 130012, P.R. China
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Khondakar KR, Dey S, Wuethrich A, Sina AAI, Trau M. Toward Personalized Cancer Treatment: From Diagnostics to Therapy Monitoring in Miniaturized Electrohydrodynamic Systems. Acc Chem Res 2019; 52:2113-2123. [PMID: 31293158 DOI: 10.1021/acs.accounts.9b00192] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Historically, cancer was seen and treated as a single disease. Over the years, this image has shifted, and it is now generally accepted that cancer is a complex and dynamic disease that engages multiple progression pathways in each patient. The shift from treating cancer as single disease to tailoring the therapy based on the individual's characteristic cancer profile promises to improve the clinical outcome and has also given rise to the field of personalized cancer treatment. To advise a suitable therapy plan and adjust personalized treatment, a reliable and fast diagnostic strategy is required. The advances in nanotechnology, microfluidics, and biomarker research have spurred the development of powerful miniaturized diagnostic systems that show high potential for use in personalized cancer treatment. These devices require only minute sample volumes and have the capability to create instant cancer snapshots that could be used as tool for cancer risk indication, early detection, tumor classification, and recurrence. Miniaturized systems can combine a whole sample-to-answer workflow including sample handling, preparation, analysis, and detection. As such, this concept is also often referred to as "lab-on-a-chip". An inherit challenge of monitoring personalized cancer treatment using miniaturized systems is that cancer biomarkers are often only detectable at trace concentrations present in a complex biological sample rich in interfering molecules, necessitating highly specific and sensitive biosensing strategies. To address the need for trace level detection, highly sensitive fluorescence, absorbance, surface-enhanced Raman spectroscopy (SERS), electrochemical, mass spectrometric, and chemiluminescence approaches were developed. To reduce sample matrix interferences, ingenious device modifications including coatings and nanoscopic fluid flow manipulation have been developed. Of the latter, our group has exploited the use of alternating current electrohydrodynamic (ac-EHD) fluid flows as an efficient strategy to reduce nonspecific nontarget biosensor binding and speed-up assay times. ac-EHD provides fluid motion induced by an electric field with the ability to generate surface shear forces in nanometer distance to the biosensing surface (known as nanoshearing phenomenon). This is ideally suited to increase the collision frequency of cancer biomarkers with the biosensing surface and shear off nontarget molecules thereby minimizing nonspecific binding. In this Account, we review recent advancements in miniaturized diagnostic system development with potential use in personalized cancer treatment and monitoring. We focus on integrated microfluidic structures for controlled sample flow manipulation followed by on-device biomarker interrogation. We further highlight the progress in our group, emphasis fundamentals and applications of ac-EHD-enhanced miniaturized systems, and outline promising detection concepts for comprehensive cancer biomarker profiling. The advances are discussed based on the type of cancer biomarkers and cover circulating tumor cells, proteins, extracellular vesicles, and nucleic acids. The potential of miniaturized diagnostic systems for personalized cancer treatment and monitoring is underlined with representative examples including device illustrations. In the final section, we critically discuss the future of personalized diagnostics and what challenges should be addressed to make these devices clinically translatable.
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Affiliation(s)
- Kamil Reza Khondakar
- Centre for Personalised Nanomedicine, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner College
and Cooper Roads (Bldg 75), Brisbane, QLD 4072, Australia
| | - Shuvashis Dey
- Centre for Personalised Nanomedicine, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner College
and Cooper Roads (Bldg 75), Brisbane, QLD 4072, Australia
| | - Alain Wuethrich
- Centre for Personalised Nanomedicine, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner College
and Cooper Roads (Bldg 75), Brisbane, QLD 4072, Australia
| | - Abu Ali Ibn Sina
- Centre for Personalised Nanomedicine, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner College
and Cooper Roads (Bldg 75), Brisbane, QLD 4072, Australia
| | - Matt Trau
- Centre for Personalised Nanomedicine, Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner College
and Cooper Roads (Bldg 75), Brisbane, QLD 4072, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
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Wang M, Zhao C, Miao X, Zhao Y, Rufo J, Liu YJ, Huang TJ, Zheng Y. Plasmofluidics: Merging Light and Fluids at the Micro-/Nanoscale. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:4423-44. [PMID: 26140612 PMCID: PMC4856436 DOI: 10.1002/smll.201500970] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/07/2015] [Indexed: 05/14/2023]
Abstract
Plasmofluidics is the synergistic integration of plasmonics and micro/nanofluidics in devices and applications in order to enhance performance. There has been significant progress in the emerging field of plasmofluidics in recent years. By utilizing the capability of plasmonics to manipulate light at the nanoscale, combined with the unique optical properties of fluids and precise manipulation via micro/nanofluidics, plasmofluidic technologies enable innovations in lab-on-a-chip systems, reconfigurable photonic devices, optical sensing, imaging, and spectroscopy. In this review article, the most recent advances in plasmofluidics are examined and categorized into plasmon-enhanced functionalities in microfluidics and microfluidics-enhanced plasmonic devices. The former focuses on plasmonic manipulations of fluids, bubbles, particles, biological cells, and molecules at the micro/nanoscale. The latter includes technological advances that apply microfluidic principles to enable reconfigurable plasmonic devices and performance-enhanced plasmonic sensors. The article is concluded with perspectives on the upcoming challenges, opportunities, and possible future directions of the emerging field of plasmofluidics.
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Affiliation(s)
- Mingsong Wang
- Department of Mechanical Engineering, Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin, Austin, Texas 78712, USA
| | - Chenglong Zhao
- Department of Physics Electro-Optics, Graduate Program University of Dayton, Dayton, Ohio 45469, USA
| | - Xiaoyu Miao
- Google, Inc., 1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA
| | - Yanhui Zhao
- Department of Engineering Science and Mechanics, Department of Biomedical Engineering, Materials Research Institute, Huck Institute of Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Joseph Rufo
- Department of Engineering Science and Mechanics, Department of Biomedical Engineering, Materials Research Institute, Huck Institute of Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Yan Jun Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR) 3 Research Link, Singapore 117602, Singapore
| | - Tony Jun Huang
- Department of Engineering Science and Mechanics, Department of Biomedical Engineering, Materials Research Institute, Huck Institute of Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Yuebing Zheng
- Department of Mechanical Engineering, Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin, Austin, Texas 78712, USA
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Fagaschewski J, Sellin D, Wiedenhöfer C, Bohne S, Trieu HK, Hilterhaus L. Spatially resolved in situ determination of reaction progress using microfluidic systems and FT-IR spectroscopy as a tool for biocatalytic process development. Bioprocess Biosyst Eng 2015; 38:1399-405. [DOI: 10.1007/s00449-015-1381-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Accepted: 02/20/2015] [Indexed: 11/29/2022]
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7
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Microfluidic platform towards point-of-care diagnostics in infectious diseases. J Chromatogr A 2014; 1377:13-26. [PMID: 25544727 DOI: 10.1016/j.chroma.2014.12.041] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/06/2014] [Accepted: 12/09/2014] [Indexed: 01/09/2023]
Abstract
Rapid and timely diagnosis of infectious diseases is a critical determinant of clinical outcomes and general public health. For the detection of various pathogens, microfluidics-based platforms offer many advantages, including speed, cost, portability, high throughput, and automation. This review provides an overview of the recent advances in microfluidic technologies for point-of-care (POC) diagnostics for infectious diseases. The key aspects of such technologies for the development of a fully integrated POC platform are introduced, including sample preparation, on-chip nucleic acid analysis and immunoassay, and system integration/automation. The current challenges to practical implementation of this technology are discussed together with future perspectives.
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Chrimes AF, Khoshmanesh K, Stoddart PR, Mitchell A, Kalantar-Zadeh K. Microfluidics and Raman microscopy: current applications and future challenges. Chem Soc Rev 2014; 42:5880-906. [PMID: 23624774 DOI: 10.1039/c3cs35515b] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Raman microscopy systems are becoming increasingly widespread and accessible for characterising chemical species. Microfluidic systems are also progressively finding their way into real world applications. Therefore, it is anticipated that the integration of Raman systems with microfluidics will become increasingly attractive and practical. This review aims to provide an overview of Raman microscopy-microfluidics integrated systems for researchers who are actively interested in utilising these tools. The fundamental principles and application strengths of Raman microscopy are discussed in the context of microfluidics. Various configurations of microfluidics that incorporate Raman microscopy methods are presented, with applications highlighted. Data analysis methods are discussed, with a focus on assisting the interpretation of Raman-microfluidics data from complex samples. Finally, possible future directions of Raman-microfluidic systems are presented.
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Affiliation(s)
- Adam F Chrimes
- School of Electrical and Computer Engineering, RMIT University, 124 LaTrobe St, Melbourne, Australia.
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9
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Intartaglia R, Das G, Bagga K, Gopalakrishnan A, Genovese A, Povia M, Di Fabrizio E, Cingolani R, Diaspro A, Brandi F. Laser synthesis of ligand-free bimetallic nanoparticles for plasmonic applications. Phys Chem Chem Phys 2013. [DOI: 10.1039/c2cp42656k] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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10
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Yue J, Schouten JC, Nijhuis TA. Integration of Microreactors with Spectroscopic Detection for Online Reaction Monitoring and Catalyst Characterization. Ind Eng Chem Res 2012. [DOI: 10.1021/ie301258j] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jun Yue
- Laboratory of Chemical Reactor Engineering, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology,
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Jaap C. Schouten
- Laboratory of Chemical Reactor Engineering, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology,
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - T. Alexander Nijhuis
- Laboratory of Chemical Reactor Engineering, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology,
P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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11
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Enzyme-free detection and quantification of double-stranded nucleic acids. Anal Bioanal Chem 2012; 404:415-22. [PMID: 22695500 DOI: 10.1007/s00216-012-6133-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 04/24/2012] [Accepted: 05/21/2012] [Indexed: 01/01/2023]
Abstract
We have developed a fully enzyme-free SERRS hybridization assay for specific detection of double-stranded DNA sequences. Although all DNA detection methods ranging from PCR to high-throughput sequencing rely on enzymes, this method is unique for being totally non-enzymatic. The efficiency of enzymatic processes is affected by alterations, modifications, and/or quality of DNA. For instance, a limitation of most DNA polymerases is their inability to process DNA damaged by blocking lesions. As a result, enzymatic amplification and sequencing of degraded DNA often fail. In this study we succeeded in detecting and quantifying, within a mixture, relative amounts of closely related double-stranded DNA sequences from Rupicapra rupicapra (chamois) and Capra hircus (goat). The non-enzymatic SERRS assay presented here is the corner stone of a promising approach to overcome the failure of DNA polymerase when DNA is too degraded or when the concentration of polymerase inhibitors is too high. It is the first time double-stranded DNA has been detected with a truly non-enzymatic SERRS-based method. This non-enzymatic, inexpensive, rapid assay is therefore a breakthrough in nucleic acid detection.
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Fan M, Wang P, Escobedo C, Sinton D, Brolo AG. Surface-enhanced Raman scattering (SERS) optrodes for multiplexed on-chip sensing of nile blue A and oxazine 720. LAB ON A CHIP 2012; 12:1554-1560. [PMID: 22398836 DOI: 10.1039/c2lc20648j] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The fabrication and on-chip integration of surface-enhanced Raman scattering (SERS) optrodes are presented. In the optrode configuration, both the laser excitation and the back-scattered Raman signal are transmitted through the same optical fiber. The SERS-active component of the optrode was fabricated through the self-assembly of silver nanoparticles on the tip of optical fibers. The application of SERS optrodes to detect dyes in aqueous solution indicated a limit of quantification below 1 nM, using nile blue A as a molecular probe. Using the optrode-integrated microfluidic chip, it was possible to detect several different dyes from solutions sequentially injected into the same channel. This approach for sequential detection of different analytes is applicable to monitoring on-chip chemical processes. The narrow bandwidth of the vibrational information generated by SERS allowed solutions of different compositions of two chemically similar dyes to be distinguished using a dilution microfluidic chip. These results demonstrate the advantages of the SERS-optrode for microfluidics applications by illustrating the potential of this vibrational method to quantify components in a mixture.
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Affiliation(s)
- Meikun Fan
- Department of Chemistry, University of Victoria, Victoria, BC V8W 3V6, Canada
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Syme CD, Martino C, Yusvana R, Sirimuthu NMS, Cooper JM. Quantitative Characterization of Individual Microdroplets using Surface-Enhanced Resonance Raman Scattering Spectroscopy. Anal Chem 2012; 84:1491-5. [DOI: 10.1021/ac202705a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Christopher D. Syme
- Advanced Medical Diagnostics
group, School of Engineering, University of Glasgow, Glasgow, G12 8LT, Scotland,
U.K
| | - Chiara Martino
- Advanced Medical Diagnostics
group, School of Engineering, University of Glasgow, Glasgow, G12 8LT, Scotland,
U.K
| | - Rama Yusvana
- Advanced Medical Diagnostics
group, School of Engineering, University of Glasgow, Glasgow, G12 8LT, Scotland,
U.K
| | - Narayana M. S. Sirimuthu
- Advanced Medical Diagnostics
group, School of Engineering, University of Glasgow, Glasgow, G12 8LT, Scotland,
U.K
| | - Jonathan M. Cooper
- Advanced Medical Diagnostics
group, School of Engineering, University of Glasgow, Glasgow, G12 8LT, Scotland,
U.K
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14
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Microfluidic Raman Spectroscopy for Bio-chemical Sensing and Analysis. SPRINGER SERIES ON CHEMICAL SENSORS AND BIOSENSORS 2012. [DOI: 10.1007/978-3-642-25498-7_9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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März A, Henkel T, Cialla D, Schmitt M, Popp J. Droplet formation via flow-through microdevices in Raman and surface enhanced Raman spectroscopy--concepts and applications. LAB ON A CHIP 2011; 11:3584-3592. [PMID: 21964776 DOI: 10.1039/c1lc20638a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This review outlines concepts and applications of droplet formation via flow-through microdevices in Raman and surface enhanced Raman spectroscopy (SERS) as well as the advantages of the approach. Even though the droplet-based flow-through technique is utilized in various fields, the review focuses on implementing droplet-based fluidic systems in Raman and SERS as these highly specific detection methods are of major interest in the field of analytics. With the combination of Raman or SERS with droplet-based fluidics, it is expected to achieve novel opportunities for analytics. Besides the approach of using droplet-based microfluidic devices as a detection platform, the unique properties of flow-through systems for the formation of droplets are capitalized to produce SERS active substrates and to accomplish uniform sample preparation. Within this contribution, previous reported applications on droplet-based flow-through Raman and SERS approaches and the additional benefit with regard to the importance in the field of analytics are considered.
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Affiliation(s)
- Anne März
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
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Chrimes AF, Kayani AA, Khoshmanesh K, Stoddart PR, Mulvaney P, Mitchell A, Kalantar-Zadeh K. Dielectrophoresis-Raman spectroscopy system for analysing suspended nanoparticles. LAB ON A CHIP 2011; 11:921-8. [PMID: 21267497 DOI: 10.1039/c0lc00481b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A microfluidic dielectrophoresis platform consisting of curved microelectrodes was developed and integrated with a Raman spectroscopy system. The electrodes were patterned on a quartz substrate, which has insignificant Raman response, and integrated with a microfluidic channel that was imprinted in poly-dimethylsiloxane (PDMS). We will show that this novel integrated system can be efficiently used for the determination of suspended particle types and the direct mapping of their spatial concentrations. We will also illustrate the system's unique advantages over conventional optical systems. Nanoparticles of tungsten trioxide (WO(3)) and polystyrene were used in the investigations, as they are Raman active and can be homogeneously suspended in water.
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Affiliation(s)
- Adam F Chrimes
- School of Electrical and Computer Engineering, RMIT University, Victoria, Australia.
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17
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Gill R, Le Ru EC. Fluorescence enhancement at hot-spots: the case of Ag nanoparticle aggregates. Phys Chem Chem Phys 2011; 13:16366-72. [DOI: 10.1039/c1cp21008d] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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18
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Gao R, Choi N, Chang SI, Kang SH, Song JM, Cho SI, Lim DW, Choo J. Highly sensitive trace analysis of paraquat using a surface-enhanced Raman scattering microdroplet sensor. Anal Chim Acta 2010; 681:87-91. [DOI: 10.1016/j.aca.2010.09.036] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Revised: 09/17/2010] [Accepted: 09/21/2010] [Indexed: 11/26/2022]
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19
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DNA–WT1 protein interaction studied by surface-enhanced Raman spectroscopy. Anal Bioanal Chem 2010; 396:1415-21. [DOI: 10.1007/s00216-009-3364-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Revised: 11/27/2009] [Accepted: 12/01/2009] [Indexed: 02/06/2023]
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20
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Strelau KK, Kretschmer R, Möller R, Fritzsche W, Popp J. SERS as tool for the analysis of DNA-chips in a microfluidic platform. Anal Bioanal Chem 2009; 396:1381-4. [DOI: 10.1007/s00216-009-3374-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2009] [Revised: 11/25/2009] [Accepted: 12/02/2009] [Indexed: 11/29/2022]
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21
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Chan KLA, Gulati S, Edel JB, de Mello AJ, Kazarian SG. Chemical imaging of microfluidic flows using ATR-FTIR spectroscopy. LAB ON A CHIP 2009; 9:2909-2913. [PMID: 19789743 DOI: 10.1039/b909573j] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Elucidating the chemical composition of microfluidic flows is crucial in both understanding and optimising reactive processes within small-volume environments. Herein we report the implementation of a novel detection methodology based on Attenuated Total Reflection (ATR)-Fourier Transform Infra-Red (FTIR) spectroscopic imaging using an infrared focal plane array detector for microfluidic applications. The method is based on the combination of an inverted prism-shape ATR crystal with a poly(dimethylsiloxane)-based microfluidic mixing device. To demonstrate the efficacy of this approach, we report the direct measurement and imaging of the mixing of two liquids of different viscosities and the imaging and mixing of H2O and D2O with consecutive H/D isotope exchange. This chemically specific imaging approach allows direct analysis of fluid composition as a function of spatial position without the use of added labels or dyes, and can be used to study many processes in microfluidics ranging from reactions to separations.
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Affiliation(s)
- K L Andrew Chan
- Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom
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22
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Grabolle M, Kapusta P, Nann T, Shu X, Ziegler J, Resch-Genger U. Fluorescence Lifetime Multiplexing with Nanocrystals and Organic Labels. Anal Chem 2009; 81:7807-13. [DOI: 10.1021/ac900934a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Markus Grabolle
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Peter Kapusta
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Thomas Nann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Xu Shu
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Jan Ziegler
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
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Lui C, Cady NC, Batt CA. Nucleic Acid-based Detection of Bacterial Pathogens Using Integrated Microfluidic Platform Systems. SENSORS (BASEL, SWITZERLAND) 2009; 9:3713-44. [PMID: 22412335 PMCID: PMC3297159 DOI: 10.3390/s90503713] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Revised: 05/12/2009] [Accepted: 05/18/2009] [Indexed: 01/19/2023]
Abstract
The advent of nucleic acid-based pathogen detection methods offers increased sensitivity and specificity over traditional microbiological techniques, driving the development of portable, integrated biosensors. The miniaturization and automation of integrated detection systems presents a significant advantage for rapid, portable field-based testing. In this review, we highlight current developments and directions in nucleic acid-based micro total analysis systems for the detection of bacterial pathogens. Recent progress in the miniaturization of microfluidic processing steps for cell capture, DNA extraction and purification, polymerase chain reaction, and product detection are detailed. Discussions include strategies and challenges for implementation of an integrated portable platform.
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Affiliation(s)
- Clarissa Lui
- Department of Biomedical Engineering / Cornell University, 317 Stocking Hall, Ithaca, NY 14853, USA
| | - Nathaniel C. Cady
- College of Nanoscale Science and Engineering / University at Albany State University of New York, 255 Fuller Rd., Albany, NY 12203, USA; E-Mail: (N.C.C.)
| | - Carl A. Batt
- Department of Food Science / Cornell University, 312 Stocking Hall, Ithaca, NY 14853, USA; E-Mail: (C.A.B.)
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24
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Huh YS, Chung AJ, Cordovez B, Erickson D. Enhanced on-chip SERS based biomolecular detection using electrokinetically active microwells. LAB ON A CHIP 2009; 9:433-9. [PMID: 19156293 PMCID: PMC2718423 DOI: 10.1039/b809702j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Here we present a novel microfluidic technique for on-chip surface enhanced Raman spectroscopy (SERS) based biomolecular detection, exploiting the use of electrokinetically active microwells. Briefly, the chip comprises of a series of microfluidic channels containing embedded microwells that, when electrically actuated, either locally attract or repulse species from solution through a combination of electrokinetic effects. We demonstrate that the approach combines the advantages of existing homogeneous (solution phase) and heterogeneous (surface phase) on-chip techniques by enabling active mixing to enhance the rate of binding between the SERS enhancers and the biomolecular targets as well as rapid concentration of the product for surface phase optical interrogation. This paper describes the chip design and fabrication procedure, experimental results illustrating the optimal conditions for our concentration and mixing processes, and a numerical analysis of the flow pattern. To demonstrate the usefulness of the device we apply it to the quantitative detection of nucleic acid sequences associated with Dengue virus serotype 2. We report a limit of detection for Dengue sequences of 30 pM and show excellent specificity against other serotypes.
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Affiliation(s)
- Yun Suk Huh
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA.
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25
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Quang LX, Lim C, Seong GH, Choo J, Do KJ, Yoo SK. A portable surface-enhanced Raman scattering sensor integrated with a lab-on-a-chip for field analysis. LAB ON A CHIP 2008; 8:2214-9. [PMID: 19023489 DOI: 10.1039/b808835g] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
An integrated real-time sensing system that uses a portable Raman spectrometer and a micropillar array chip has been developed for field analysis. The problem of poor detection sensitivity, caused by miniaturization in the portable Raman spectrometer, was overcome by using the surface-enhanced Raman scattering (SERS) technique. The problem of poor reproducibility in the SERS detection, caused by different particle sizes and inhomogeneous degrees of aggregation, was also overcome by using continuous flow and homogeneous mixing between the analytes and nanocolloidal silver in a micropillar array microfluidic chip. Two hazardous materials, dipicolinic acid and malachite green, were quantitatively analysed using our integrated portable Raman sensor system. The observed limit of detection was estimated to be 200 ppb and 500 ppb, respectively. Our proposed analytical method, using a micropillar array PDMS chip and a portable SERS system, offers a rapid and reproducible trace detection capability for hazardous materials in the field.
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Affiliation(s)
- Ly Xuan Quang
- Department of Applied Chemistry, Hanyang University, Ansan, 426-791, South Korea
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26
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Multiple surface plasmon resonances and near-infrared field enhancement of gold nanowells. Anal Chem 2008; 80:4945-50. [PMID: 18507399 DOI: 10.1021/ac800149d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arrays of Au nanowells (NWs) were fabricated by electron-beam lithography (EBL) and characterized by surface plasmon resonance (SPR) and surface-enhanced Raman scattering (SERS). It is revealed that these Au NW arrays exhibit multiple SP resonances that can be tuned by adjusting the geometrical characteristics of the NWs. SERS activity of Au NWs was confirmed for a range of excitation wavelengths and a number of model compounds including rhodamine 6G (R6G), phthalazine, and single-stranded oligonucleotides. According to numerical simulations based on the discrete dipole approximation (DDA), SERS enhancement originates from high electromagnetic fields (hot spots) localized both inside and outside individual NWs. In addition, far-field intercoupling effects between NWs have been observed experimentally in arrays with subwavelength pitch sizes. We show that the SERS enhancement factors can also be tuned and optimized by adjusting the geometry of NWs.
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27
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Chen L, Choo J. Recent advances in surface-enhanced Raman scattering detection technology for microfluidic chips. Electrophoresis 2008; 29:1815-28. [DOI: 10.1002/elps.200700554] [Citation(s) in RCA: 180] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Hering KK, Möller R, Fritzsche W, Popp J. Microarray-Based Detection of Dye-Labeled DNA by SERRS Using Particles Formed by Enzymatic Silver Deposition. Chemphyschem 2008; 9:867-72. [PMID: 18386261 DOI: 10.1002/cphc.200700591] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Faulds K, Jarvis R, Smith WE, Graham D, Goodacre R. Multiplexed detection of six labelled oligonucleotides using surface enhanced resonance Raman scattering (SERRS). Analyst 2008; 133:1505-12. [DOI: 10.1039/b800506k] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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31
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Ackermann KR, Henkel T, Popp J. Quantitative Online Detection of Low-Concentrated Drugs via a SERS Microfluidic System. Chemphyschem 2007; 8:2665-70. [DOI: 10.1002/cphc.200700554] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Hering K, Cialla D, Ackermann K, Dörfer T, Möller R, Schneidewind H, Mattheis R, Fritzsche W, Rösch P, Popp J. SERS: a versatile tool in chemical and biochemical diagnostics. Anal Bioanal Chem 2007; 390:113-24. [DOI: 10.1007/s00216-007-1667-3] [Citation(s) in RCA: 406] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Revised: 09/28/2007] [Accepted: 10/01/2007] [Indexed: 11/27/2022]
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33
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Hunt HC, Wilkinson JS. Optofluidic integration for microanalysis. MICROFLUIDICS AND NANOFLUIDICS 2007; 4:53-79. [PMID: 32214954 PMCID: PMC7087941 DOI: 10.1007/s10404-007-0223-y] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Accepted: 07/25/2007] [Indexed: 05/09/2023]
Abstract
This review describes recent research in the application of optical techniques to microfluidic systems for chemical and biochemical analysis. The "lab-on-a-chip" presents great benefits in terms of reagent and sample consumption, speed, precision, and automation of analysis, and thus cost and ease of use, resulting in rapidly escalating adoption of microfluidic approaches. The use of light for detection of particles and chemical species within these systems is widespread because of the sensitivity and specificity which can be achieved, and optical trapping, manipulation and sorting of particles show significant benefits in terms of discrimination and reconfigurability. Nonetheless, the full integration of optical functions within microfluidic chips is in its infancy, and this review aims to highlight approaches, which may contribute to further miniaturisation and integration.
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Affiliation(s)
- Hamish C. Hunt
- Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, Hampshire SO17 1BJ UK
| | - James S. Wilkinson
- Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, Hampshire SO17 1BJ UK
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34
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Abstract
The direction of modern analytical techniques is to push for lower detection limits, improved selectivity and sensitivity, faster analysis time, higher throughput, and more inexpensive analysis systems with ever-decreasing sample volumes. These very ambitious goals are exacerbated by the need to reduce the overall size of the device and the instrumentation - the quest for functional micrototal analysis systems epitomizes this. Microfluidic devices fabricated in glass, and more recently, in a variety of polymers, brings us a step closer to being able to achieve these stringent goals and to realize the economical fabrication of sophisticated instrumentation. However, this places a significant burden on the detection systems associated with microchip-based analysis systems. There is a need for a universal detector that can efficiently detect sample analytes in real time and with minimal sample manipulation steps, such as lengthy labeling protocols. This review highlights the advances in uncommon or less frequently used detection methods associated with microfluidic devices. As a result, the three most common methods - LIF, electrochemical, and mass spectrometric techniques - are omitted in order to focus on the more esoteric detection methods reported in the literature over the last 2 years.
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Affiliation(s)
- Pertti J Viskari
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA
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35
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Zhang X, Cooper JM, Monaghan PB, Haswell SJ. Continuous flow separation of particles within an asymmetric microfluidic device. LAB ON A CHIP 2006; 6:561-6. [PMID: 16572220 DOI: 10.1039/b515272k] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
A microfluidic based device has been developed for the continuous separation of polymer microspheres, taking advantage of the flow characteristics of systems. The chip consists of an asymmetric cavity with variable channel width which enables continuous amplification of the particle separation for different size particles within the laminar flow profile. The process has been examined by varying the sample inlet position, the sample to media flow rate ratio, and the total flow rate. This technique can be applied for manipulating both microscale biological and colloidal particles within microfluidic systems.
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Affiliation(s)
- Xunli Zhang
- Department of Chemistry, University of Hull, Hull, United Kingdom
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36
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Ryder AG. Surface enhanced Raman scattering for narcotic detection and applications to chemical biology. Curr Opin Chem Biol 2006; 9:489-93. [PMID: 16055368 DOI: 10.1016/j.cbpa.2005.07.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2005] [Accepted: 07/20/2005] [Indexed: 10/25/2022]
Abstract
Raman spectroscopy is rapidly finding favour for applications in the life science because of the ease with which it can be used to extract significant data from tissue and cells. However, the Raman effect is an inherently weak effect, which hinders the analysis of low concentration analytes. Raman sensitivity can be improved via the surface enhanced Raman scattering (SERS) effect. In SERS, Raman spectra are dramatically amplified when a molecule is adsorbed onto nano-roughened noble metal surfaces such as silver and gold. The degree of enhancement enables single-molecule detection, which offers the potential for the unambiguous identification of analytes at concentrations that are useful in both a forensic and a chemical biology context. Here we discuss some of the practical applications of SERS to both low-level narcotic detection, and how this can be applied to chemical biology.
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Affiliation(s)
- Alan G Ryder
- Department of Chemistry, and National Centre for Biomedical Engineering Science, National University of Ireland-Galway, Galway, Ireland.
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37
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Barnes SE, Cygan ZT, Yates JK, Beers KL, Amis EJ. Raman spectroscopic monitoring of droplet polymerization in a microfluidic device. Analyst 2006; 131:1027-33. [PMID: 17047803 DOI: 10.1039/b603693g] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microfluidic methodologies are becoming increasingly important for rapid formulation and screening of materials, and development of analytical tools for multiple sample screening is a critical step in achieving a combinatorial 'lab on a chip' approach. This work demonstrates the application of Raman spectroscopy for analysis of monomer composition and degree of conversion of methacrylate-based droplets in a microfluidic device. Droplet formation was conducted by flow focusing on the devices, and a gradient of component composition was created by varying the flow rates of the droplet-phase fluids into the microchannels. Raman data were collected using a fiber optic probe from a stationary array of the droplets/particles on the device, followed by partial least squares (PLS) calibration of the first derivative (1600 cm(-1) to 1550 cm(-1)) allowing successful measurement of monomer composition with a standard error of calibration (SEC) of +/-1.95% by volume. Following photopolymerization, the percentage of double bond conversion of the individual particles was calculated from the depletion of the normalized intensity of the C[double bond, length as m-dash]C stretching vibration at 1605 cm(-1). Raman data allowed accurate measurement of the decrease in double bond conversion as a function of increasing crosslinker concentration. The results from the research demonstrate that Raman spectroscopy is an effective, on-chip analytical tool for screening polymeric materials on the micrometre scale.
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Affiliation(s)
- Susan E Barnes
- NIST Combinatorial Methods Center, Polymers Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20879-8542, USA
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38
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McCabe AF, Eliasson C, Prasath RA, Hernandez-Santana A, Stevenson L, Apple I, Cormack PAG, Graham D, Smith WE, Corish P, Lipscomb SJ, Holland ER, Prince PD. SERRS labelled beads for multiplex detection. Faraday Discuss 2006; 132:303-8; discussion 309-19. [PMID: 16833125 DOI: 10.1039/b506942d] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Beads labelled using surface enhanced resonance Raman scattering (SERRS) are highly sensitive and specific tags, with potential applications in biological assays, including molecular diagnostics. The beads consist of a nucleus containing dye labelled silver-nanoparticle aggregates surrounded by a polymer core. The nuclei generate strong SERRS signals. To illustrate the coding advantage created by the sharp, molecularly specific SERRS signals, four specially designed SERRS dyes have been used as labels and three of these have been combined in a multiplex analysis. These dyes use specific groups such as benzotriazole and 8-hydroxyquinoline to improve binding to the surface of the silver particles. The aggregation state of the particles is held constant by the polymer core, this nucleus also contains many dye labels, yielding a very high Raman scattering intensity for each bead. To functionalise these beads for use in biological assays an outer polymer shell can be added, which allows the attachment of oligonucleotide probes. Oligonucleotide modified beads can then be used for detection of specific oligonucleotide targets. The specificity of SERRS will allow for the detection of multiple targets within a single assay.
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Affiliation(s)
- Ailie F McCabe
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, UK
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39
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Khan I, Cunningham D, Littleford RE, Graham D, Smith WE, McComb DW. From Micro to Nano: Analysis of Surface-Enhanced Resonance Raman Spectroscopy Active Sites via Multiscale Correlations. Anal Chem 2005; 78:224-30. [PMID: 16383331 DOI: 10.1021/ac051158a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Effective correlation of data from a number of analytical techniques over length scales spanning several orders of magnitude is required to more fully investigate the active sites on silver nanoparticles that are responsible for surface-enhanced resonance Raman scattering (SERRS). In this paper, a method is presented that uses fluorescent beads as optical markers to allow direct correlation between a SERRS/fluorescence map and a transmission electron microscope (TEM) collage of the same area. Factors influencing the accuracy of the technique include the flatness of the substrate, the size of the fluorescent beads, and the strength of the signal from the fluorescent beads. When the effect of each of these factors on the technique is addressed, a simple and accurate correlation between the optical spectroscopy and the electron microscopy is achieved. A statistically significant number of particles can then be easily and reliably located and characterized at both optical limits, by SERRS, and with subnanometer resolution in the high-resolution TEM. Examples of HRTEM images and the locations of these particles within the SERRS map/TEM collage are presented. Our findings reveal that the relative SERRS activity of single particles is very low compared to dimers and larger aggregates of particles. The relative activity of dimers is estimated to be 12.4 times greater than single particles, and as the number of particles in the aggregate increase, the relative SERRS activity also increases. The relative SERRS activities of single particles/dimers/trimers/aggregates of 4-9 particles/aggregates of 10-20 are estimated to be 1/12.4/15.6/23.2/43.
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Affiliation(s)
- Imran Khan
- Department of Materials, Imperial College London, London SW7 2AZ, UK
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40
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Park T, Lee S, Seong GH, Choo J, Lee EK, Kim YS, Ji WH, Hwang SY, Gweon DG, Lee S. Highly sensitive signal detection of duplex dye-labelled DNA oligonucleotides in a PDMS microfluidic chip: confocal surface-enhanced Raman spectroscopic study. LAB ON A CHIP 2005; 5:437-442. [PMID: 15791342 DOI: 10.1039/b414457k] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Rapid and highly sensitive detection of duplex dye-labelled DNA sequences in a PDMS microfluidic channel was investigated using confocal surface enhanced Raman spectroscopy (SERS). This method does not need either an immobilization procedure or a PCR amplification procedure, which are essential for a DNA microarray chip. Furthermore, Raman peaks of each dye-labelled DNA can be easily resolved since they are much narrower than the corresponding broad fluorescence bands. To find the potential applicability of confocal SERS for sensitive bio-detection in a microfluidic channel, the mixture of two different dye-labelled (TAMRA and Cy3) sex determining Y genes, SRY and SPGY1, was adsorbed on silver colloids in the alligator teeth-shaped PDMS microfluidic channel and its SERS signals were measured under flowing conditions. Its major SERS peaks were observable down to the concentration of 10(-11) M. In the present study, we explore the feasibility of confocal SERS for the highly sensitive detection of duplex dye-labelled DNA oligonucleotides in a PDMS microfluidic chip.
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Affiliation(s)
- Taehan Park
- Department of Applied Chemistry, Hanyang University, Ansan 426-791, South Korea
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41
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Faulds K, Smith WE, Graham D. DNA detection by surface enhanced resonance Raman scattering (SERRS). Analyst 2005; 130:1125-31. [PMID: 16021211 DOI: 10.1039/b500248f] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Education article outlines the different ways in which surface enhanced resonance Raman scattering (SERRS) can be used for the detection of DNA. The use of various different SERRS detection strategies that have allowed both sensitive and selective detection to be obtained is covered. Detection of DNA by SERRS involves the use of a dye with the DNA, whether as an intercalator or by direct covalent attachment. This generates strong SERRS signals that indicate the presence of the specific DNA sequence. The SERRS detection of DNA in different molecular biological assays is also discussed.
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Affiliation(s)
- Karen Faulds
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, UKG1 1XL
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42
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Yea KH, Lee S, Kyong JB, Choo J, Lee EK, Joo SW, Lee S. Ultra-sensitive trace analysis of cyanide water pollutant in a PDMS microfluidic channel using surface-enhanced Raman spectroscopy. Analyst 2005; 130:1009-11. [PMID: 15965522 DOI: 10.1039/b501980j] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rapid and highly sensitive trace analysis of cyanide water pollutant in an alligator teeth-shaped PDMS microfluidic channel was investigated using surface-enhanced Raman spectroscopy. Compared with previously reported analytical methods, the detection sensitivity was enhanced by several orders of magnitude.
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Affiliation(s)
- Kwon-hae Yea
- Department of Applied Chemistry, Hanyang University, Ansan 426-791, South Korea
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