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Zou B, Lou S, Wang J, Zhou S, Wang Y. Periodic Surface-Enhanced Raman Scattering-Encoded Magnetic Beads for Reliable Quantitative Surface-Enhanced Raman Scattering-Based Multiplex Bioassay. Anal Chem 2022; 94:11557-11563. [PMID: 35960877 DOI: 10.1021/acs.analchem.2c01793] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Surface-enhanced Raman scattering (SERS)-based immunoassay on encoded beads is highly attractive with the advantages of ultrasensitivity, multiplex and high throughput. However, it was a great challenge to screen out in-focus signals of the immunoconjugated SERS nanoprobes on spherical bead conveniently. Here, periodic SERS-encoded magnetic beads (PSE-MBs) were developed through droplet optofluidic technique by using monodisperse SERS-encoded magnetic nanospheres as building blocks. The designed PSE-MBs not only exhibit huge coding capacity, but also provide the strongest and reproducible SERS coding signals as "in-focus beacons". When PSE-MBs are used as capture carriers in SERS-based immunoassay, both multiple target analytes and in-focus signals of SERS nanoprobes could be easily identified according to the collected SERS coding signals. Thus, reliable quantitative analysis of multiple target analytes could be conveniently achieved by such detection protocol. Additionally, the magnetic ingredient in PSE-MBs made the operation easily during the bioassay. The multiple advantages of PSE-MBs including large coding capacity, in-focus beacons and magnetic operation endorse them to be robust capture carriers in reliable quantitative SERS-based multiplex immunoassay.
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Affiliation(s)
- Bingfang Zou
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China.,School of Physics and Electronics, Henan University, Kaifeng 475004, P. R. China
| | - Shiyun Lou
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
| | - Jizhou Wang
- Department of Clinical Laboratory, Translational Medicine Centre, Huaihe Hospital Affiliated to Henan University, Kaifeng 475004, P. R. China
| | - Shaomin Zhou
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
| | - Yongqiang Wang
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004, P. R. China
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2
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Bartolowits M, Xin M, Petrov DP, Tague TJ, Davisson VJ. Multimeric Rhodamine Dye-Induced Aggregation of Silver Nanoparticles for Surface-Enhanced Raman Scattering. ACS OMEGA 2019; 4:140-145. [PMID: 30729221 PMCID: PMC6356857 DOI: 10.1021/acsomega.8b02970] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 12/18/2018] [Indexed: 05/17/2023]
Abstract
Isotopic variants of Rhodamine 6G (R6G) have previously been used as a method of multiplexed detection for Surface Enhanced Raman Spectroscopy (SERS), including protein detection and quantification. Challenges exist, however, with producing long-term stable SERS signals with exposure to silver or gold metal surfaces without the use of additional protective coatings of nanomaterials. Here, novel rhodamine "dimers" and "trimers" have been created that demonstrate a higher avidity for metal nanoparticles and induce aggregation to create plasmonic "hotspots" as indicated by enhanced Raman scattering in situ. These aggregates can be formed in a colloid, on surfaces, or membrane substrates such as poly(vinylidene fluoride) for applications in biosciences. The integrity of the materials and Raman signals are maintained for months of time on different substrates. These dye materials should provide avenues for simplified in situ generation of sensors for Raman-based assays especially in settings requiring highly robust performance.
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Affiliation(s)
- Matthew
D. Bartolowits
- Amplified
Sciences, LLC, 1281 Win
Hentschel Blvd., West Lafayette, Indiana 47906, United
States
| | - Meiguo Xin
- Department
of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Dino P. Petrov
- Department
of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
| | - Thomas J. Tague
- Bruker
Optics, Inc., 19 Fortune Drive, Billerica, Massachusetts 01821, United States
| | - Vincent Jo Davisson
- Department
of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
- E-mail:
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Hwang J, Lee S, Choo J. Application of a SERS-based lateral flow immunoassay strip for the rapid and sensitive detection of staphylococcal enterotoxin B. NANOSCALE 2016; 8:11418-25. [PMID: 26790112 DOI: 10.1039/c5nr07243c] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A novel surface-enhanced Raman scattering (SERS)-based lateral flow immunoassay (LFA) biosensor was developed to resolve problems associated with conventional LFA strips (e.g., limits in quantitative analysis and low sensitivity). In our SERS-based biosensor, Raman reporter-labeled hollow gold nanospheres (HGNs) were used as SERS detection probes instead of gold nanoparticles. With the proposed SERS-based LFA strip, the presence of a target antigen can be identified through a colour change in the test zone. Furthermore, highly sensitive quantitative evaluation is possible by measuring SERS signals from the test zone. To verify the feasibility of the SERS-based LFA strip platform, an immunoassay of staphylococcal enterotoxin B (SEB) was performed as a model reaction. The limit of detection (LOD) for SEB, as determined with the SERS-based LFA strip, was estimated to be 0.001 ng mL(-1). This value is approximately three orders of magnitude more sensitive than that achieved with the corresponding ELISA-based method. The proposed SERS-based LFA strip sensor shows significant potential for the rapid and sensitive detection of target markers in a simplified manner.
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Affiliation(s)
- Joonki Hwang
- Department of Bionano Technology, Hanyang University, Ansan 426-791, South Korea.
| | - Sangyeop Lee
- Department of Bionano Technology, Hanyang University, Ansan 426-791, South Korea.
| | - Jaebum Choo
- Department of Bionano Technology, Hanyang University, Ansan 426-791, South Korea.
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4
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Yang K, Hu Y, Dong N. A novel biosensor based on competitive SERS immunoassay and magnetic separation for accurate and sensitive detection of chloramphenicol. Biosens Bioelectron 2016; 80:373-377. [DOI: 10.1016/j.bios.2016.01.064] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 01/25/2016] [Accepted: 01/27/2016] [Indexed: 01/08/2023]
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Liu J, Hu Y, Zhu G, Zhou X, Jia L, Zhang T. Highly sensitive detection of zearalenone in feed samples using competitive surface-enhanced Raman scattering immunoassay. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:8325-8332. [PMID: 25052032 DOI: 10.1021/jf503191e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Accurate and quantitative analysis of mycotoxin (such as zearalenone) is particularly imperative in the field of food safety and animal husbandry. Here, we develop a sensitive and specific method for zearalenone detection using competitive surface-enhanced Raman scattering (SERS) immunoassay. In this assay, a functional gold nanoparticle was labeled with the Raman reporter and the zearalenone antibody, and a modified substrate was assembled with the zearalenone-bovine serum albumin. With the addition of free zearalenone, the competitive immune reaction between free zearalenone and zearalenone-bovine serum albumin was initiated for binding with zearalenone antibody labeled on gold nanoparticle, resulting in the change of SERS signal intensity. The proposed method exhibits high sensitivity with a detection limit of 1 pg/mL and a wide dynamic range from 1 to 1000 pg/mL. Furthermore, this method can be further applied to analyze the multiple natural feed samples contaminated with zearalenone, holding great potential for real sample detection.
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Affiliation(s)
- Jianzhi Liu
- Ministry of Education Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University , Guangzhou 510631, People's Republic of China
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Schütz M, Salehi M, Schlücker S. Direct Silica Encapsulation of Self-Assembled-Monolayer-Based Surface-Enhanced Raman Scattering Labels with Complete Surface Coverage of Raman Reporters by Noncovalently Bound Silane Precursors. Chem Asian J 2014; 9:2219-24. [DOI: 10.1002/asia.201402273] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Indexed: 11/06/2022]
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Chon H, Lee S, Wang R, Bang SY, Lee HS, Bae SC, Lee H, Kim B, Choo J. SERS-based immunoassay of anti-cyclic citrullinated peptide for early diagnosis of rheumatoid arthritis. RSC Adv 2014. [DOI: 10.1039/c4ra05149a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report a highly sensitive detection method for anti-CCP autoantibodies using a SERS-based magnetic immunosensor. The proposed immunoassay technique is expected to be a new clinical tool for the early diagnosis of rheumatoid arthritis (RA).
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Affiliation(s)
- Hyangah Chon
- Department of Bionano Technology
- Hanyang University
- Ansan 426-791, South Korea
| | - Sangyeop Lee
- Department of Bionano Technology
- Hanyang University
- Ansan 426-791, South Korea
| | - Rui Wang
- Department of Bionano Technology
- Hanyang University
- Ansan 426-791, South Korea
| | - So-Young Bang
- Department of Rheumatology
- Hanyang University Hospital for Rheumatic Diseases
- , South Korea
| | - Hye-Soon Lee
- Department of Rheumatology
- Hanyang University Hospital for Rheumatic Diseases
- , South Korea
| | - Sang-Cheol Bae
- Department of Rheumatology
- Hanyang University Hospital for Rheumatic Diseases
- , South Korea
| | - Hyoban Lee
- Department of Chemistry
- KAIST
- Daejeon, South Korea
| | - Bongsoo Kim
- Department of Chemistry
- KAIST
- Daejeon, South Korea
| | - Jaebum Choo
- Department of Bionano Technology
- Hanyang University
- Ansan 426-791, South Korea
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8
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Silver deposited polystyrene (PS) microspheres for surface-enhanced Raman spectroscopic-encoding and rapid label-free detection of melamine in milk powder. Talanta 2013; 113:7-13. [DOI: 10.1016/j.talanta.2013.03.075] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2013] [Revised: 03/15/2013] [Accepted: 03/28/2013] [Indexed: 11/21/2022]
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9
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Blakey I, Merican Z, Thurecht KJ. A method for controlling the aggregation of gold nanoparticles: tuning of optical and spectroscopic properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8266-74. [PMID: 23751158 DOI: 10.1021/la401361u] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Gold nanoparticles (AuNPs) have many interesting optical properties, which are derived from their surface plasmon resonance (SPR). However, the SPR of single AuNPs occurs around 520 nm, which is a limitation for biomedical imaging applications, because the maximum falls outside the tissue transparency window (∼650-1000 nm). Here the aggregation of AuNPs is mediated by balancing aggregation and steric stabilization processes. This is achieved by varying the relative amounts of hydrophobic small molecules, which act as aggregating agents, and end functional hydrophilic polymers that serve as steric stabilizing agents. This approach allows the position of the SPR shifted into the tissue transparency window, while maintaining colloidal stability. Importantly, increased depolarized scattering and surface enhanced Raman scattering (SERS) cross sections in this region are achieved compared to the single nanoparticles. By varying the structure of the aggregating agent slightly, the SERS spectra exhibit significant changes, thus demonstrating the potential to encode different aggregates. The aggregates have potential applications in biomedical imaging, as an encoding strategy for combinatorial chemistry, and for use in flow cytometry applications.
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Affiliation(s)
- Idriss Blakey
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, St. Lucia, Queensland 4072, Australia.
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Jalani G, Lee S, Jung CW, Jang H, Choo J, Lim DW. Controlled biohybrid nanoprobes with silver nanoparticle clusters for Raman imaging. Analyst 2013; 138:4756-9. [DOI: 10.1039/c3an00943b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Affiliation(s)
- Yunqing Wang
- Key Laboratory of Coastal Zone
Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Bing Yan
- School of Chemistry and Chemical
Engineering, Shandong University, Jinan
250100, China
| | - Lingxin Chen
- Key Laboratory of Coastal Zone
Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
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12
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Pei X, Zhang B, Tang J, Liu B, Lai W, Tang D. Sandwich-type immunosensors and immunoassays exploiting nanostructure labels: A review. Anal Chim Acta 2012; 758:1-18. [PMID: 23245891 DOI: 10.1016/j.aca.2012.10.060] [Citation(s) in RCA: 295] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 10/25/2012] [Accepted: 10/30/2012] [Indexed: 12/17/2022]
Abstract
Methods based on sandwich-type immunosensors and immunoassays have been developed for detection of multivalent antigens/analytes with more than one eptiope due to the use of two matched antibodies. High-affinity antibodies and appropriate labels are usually employed for the amplification of detectable signal. Recent research has looked to develop innovative and powerful novel nanoparticle labels, controlling and tailoring their properties in a very predictable manner to meet the requirements of specific applications. This articles reviews recent advances, exploiting nanoparticle labels, in the sandwich-type immunosensors and immunoassays. Routine approaches involve noble metal nanoparticles, carbon nanomaterials, semiconductor nanoparticles, metal oxide nanostructures, and hybrid nanostructures. The enormous signal enhancement associated with the use of nanoparticle labels and with the formation of nanoparticle-antibody-antigen assemblies provides the basis for sensitive detection of disease-related proteins or biomolecules. Techniques commonly rely on the use of biofunctionalized nanoparticles, inorganic-biological hybrid nanoparticles, and signal tag-doped nanoparticles. Rather than being exhaustive, this review focuses on selected examples to illustrate novel concepts and promising applications. Approaches described include the biofunctionalized nanoparticles, inorganic-biological hybrid nanoparticles, and signal tage-doped nanoparticles. Further, promising application in electrochemical, mass-sensitive, optical and multianalyte detection are discussed in detail.
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Affiliation(s)
- Xiaomei Pei
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou 350108, PR China
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13
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Cialla D, März A, Böhme R, Theil F, Weber K, Schmitt M, Popp J. Surface-enhanced Raman spectroscopy (SERS): progress and trends. Anal Bioanal Chem 2011; 403:27-54. [PMID: 22205182 DOI: 10.1007/s00216-011-5631-x] [Citation(s) in RCA: 398] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 11/10/2011] [Accepted: 12/01/2011] [Indexed: 12/12/2022]
Abstract
Surface-enhanced Raman spectroscopy (SERS) combines molecular fingerprint specificity with potential single-molecule sensitivity. Therefore, the SERS technique is an attractive tool for sensing molecules in trace amounts within the field of chemical and biochemical analytics. Since SERS is an ongoing topic, which can be illustrated by the increased annual number of publications within the last few years, this review reflects the progress and trends in SERS research in approximately the last three years. The main reason why the SERS technique has not been established as a routine analytic technique, despite its high specificity and sensitivity, is due to the low reproducibility of the SERS signal. Thus, this review is dominated by the discussion of the various concepts for generating powerful, reproducible, SERS-active surfaces. Furthermore, the limit of sensitivity in SERS is introduced in the context of single-molecule spectroscopy and the calculation of the 'real' enhancement factor. In order to shed more light onto the underlying molecular processes of SERS, the theoretical description of SERS spectra is also a growing research field and will be summarized here. In addition, the recording of SERS spectra is affected by a number of parameters, such as laser power, integration time, and analyte concentration. To benefit from synergies, SERS is combined with other methods, such as scanning probe microscopy and microfluidics, which illustrates the broad applications of this powerful technique.
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Affiliation(s)
- Dana Cialla
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, Germany
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14
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Fenoglio I, Fubini B, Ghibaudi EM, Turci F. Multiple aspects of the interaction of biomacromolecules with inorganic surfaces. Adv Drug Deliv Rev 2011; 63:1186-209. [PMID: 21871508 DOI: 10.1016/j.addr.2011.08.001] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 07/01/2011] [Accepted: 08/02/2011] [Indexed: 12/19/2022]
Abstract
The understanding of the mechanisms involved in the interaction of biological systems with inorganic materials is of interest in both fundamental and applied disciplines. The adsorption of proteins modulates the formation of biofilms onto surfaces, a process important in infections associated to medical implants, in dental caries, in environmental technologies. The interaction with biomacromolecules is crucial to determine the beneficial/adverse response of cells to foreign inorganic materials as implants, engineered or accidentally produced inorganic nanoparticles. A detailed knowledge of the surface/biological fluids interface processes is needed for the design of new biocompatible materials. Researchers involved in the different disciplines face up with similar difficulties in describing and predicting phenomena occurring at the interface between solid phases and biological fluids. This review represents an attempt to integrate the knowledge from different research areas by focussing on the search for determinants driving the interaction of inorganic surfaces with biological matter.
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Wang Z, Zong S, Chen H, Wu H, Cui Y. Silica coated gold nanoaggregates prepared by reverse microemulsion method: dual mode probes for multiplex immunoassay using SERS and fluorescence. Talanta 2011; 86:170-7. [PMID: 22063527 DOI: 10.1016/j.talanta.2011.08.054] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Revised: 08/21/2011] [Accepted: 08/26/2011] [Indexed: 02/09/2023]
Abstract
A kind of fluorescent dye-doped, silica-coated Au aggregates was fabricated using reverse microemulsion method, which shows both strong fluorescence and intense surface enhanced Raman scattering (SERS) signals. Such a composite nanoparticle is composed of a SERS core as silica-coated Au aggregates and a fluorescent shell as dye-doped silica shell. Being prepared through reverse microemulsion method, the SERS core exhibits a sphere shape and a uniform size. Compared with a silica-coated single Au nanoparticle, our presented SERS core shows a greatly increased SERS intensity due to the Au aggregates, which is formed by simply mixing the SERS reporters and Au nanoparticles. When being excited at different wavelengths as 515 nm and 633 nm, the fluorescence and SERS signals can be separately generated, which can avoid the disturbance from each other. In addition, the potential application of such a dual mode nanoparticle in multiplex immunoassay was also demonstrated using a sandwiched structure, where the fluorescence mode can be used for indicating the occurrence of an immune reaction, and SERS mode can further be employed for distinguishing the specific kind of bio-analyte.
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Affiliation(s)
- Zhuyuan Wang
- Advanced Photonics Center, Southeast University, Nanjing 210096, People's Republic of China
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Fan M, Andrade GFS, Brolo AG. A review on the fabrication of substrates for surface enhanced Raman spectroscopy and their applications in analytical chemistry. Anal Chim Acta 2011; 693:7-25. [PMID: 21504806 DOI: 10.1016/j.aca.2011.03.002] [Citation(s) in RCA: 501] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 02/24/2011] [Accepted: 03/01/2011] [Indexed: 11/16/2022]
Abstract
This work reviews different types of substrates used for surface-enhanced Raman scattering (SERS) that have been developed in the last 10 years. The different techniques of self-assembly to immobilize metallic nanoparticles on solid support are covered. An overview of SERS platforms developed using nanolithography methods, including electron-beam (e-beam) lithography and focused ion beam (FIB) milling are also included, together with several examples of template-based methodologies to generate metallic nano-patterns. The potential of SERS to impact several aspects of analytical chemistry is demonstrated by selected examples of applications in electrochemistry, biosensing, environmental analysis, and remote sensing. This review shows that highly enhancing SERS substrates with a high degree of reliability and reproducibility can now be fabricated at relative low cost, indicating that SERS may finally realize its full potential as a very sensitive tool for routine analytical applications.
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Affiliation(s)
- Meikun Fan
- Department of Mechanical and Material Engineering, University of Western Ontario, London, Canada
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Galarreta BC, Norton PR, Lagugné-Labarthet F. SERS detection of streptavidin/biotin monolayer assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1494-8. [PMID: 21244074 DOI: 10.1021/la1047497] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A two-dimensional array of gold nanotriangles inscribed onto glass coverslips were optimized for the surface-enhanced Raman detection of streptavidin/biotin monolayer assemblies. The nanostructures were fabricated by electron beam lithography, and its optical parameters were optimized to be probed under a Raman microscope with a linearly polarized He-Ne laser with an excitation wavelength of λ = 632.8 nm. The platforms were first tested against a monolayer of biotinylated alkanethiols (BAT) functionalized over the gold nanostructure, showing that good-quality spectra could be acquired with a short acquisition time. The supramolecular interaction of streptavidin (strep) with BAT showed subsequent modification of the Raman spectrum that implies a change in the secondary structure of the host biomolecule (streptavidin). Compared to gold surfaces without nanoscale structures, the local enhancement that results from our nanostructured surfaces allows one to detect the vibrational signal of monolayers within a time on the order of seconds and under modest laser intensity, further demonstrating the utility of using plasmonic metallic nanostructures for molecular recognition.
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Affiliation(s)
- Betty C Galarreta
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada
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Lee SJ, Moskovits M. Visualizing chromatographic separation of metal ions on a surface-enhanced Raman active medium. NANO LETTERS 2011; 11:145-150. [PMID: 21133393 DOI: 10.1021/nl1031309] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Metal ion carboxylato complexes possess ion-specific carboxylate Raman bands. Using this attribute we follow the chromatographic separation of a microliter aliquot of an initially equimolar solution of Pb(2+) and Hg(2+) using the surface-enhanced Raman spectroscopy spectra of their carboxylato complexes as unique identifiers. A glass capillary whose interior is lined with a dense layer of gold nanoparticles treated with 4-mercaptobenzoic acid simultaneously acts as a separation medium and an efficient SERS reporter of the step-by-step separation process. The observed adsorption-desorption equilibrium along the capillary is shown to conform with theory. Although Hg(2+) complexes with COO(-) much more strongly than Pb(2+), it is the Pb(2+) that survives the separation process as the sole surface species. We show that this is because so much mercury is taken out of solution during early separation steps that the surface equilibrium is ultimately driven toward adsorbed Pb(2+).
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Affiliation(s)
- Seung Joon Lee
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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Cui Y, Zheng XS, Ren B, Wang R, Zhang J, Xia NS, Tian ZQ. Au@organosilica multifunctional nanoparticles for the multimodal imaging. Chem Sci 2011. [DOI: 10.1039/c1sc00242b] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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20
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Chon H, Lee S, Yoon SY, Chang SI, Lim DW, Choo J. Simultaneous immunoassay for the detection of two lung cancer markers using functionalized SERS nanoprobes. Chem Commun (Camb) 2011; 47:12515-7. [DOI: 10.1039/c1cc15707h] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Goddard G, Brown LO, Habbersett R, Brady CI, Martin JC, Graves SW, Freyer JP, Doorn SK. High-resolution spectral analysis of individual SERS-active nanoparticles in flow. J Am Chem Soc 2010; 132:6081-90. [PMID: 20143808 DOI: 10.1021/ja909850s] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nanoparticle spectroscopic tags based on surface enhanced Raman scattering (SERS) are playing an increasingly important role in bioassay and imaging applications. The ability to rapidly characterize large populations of such tags spectroscopically in a high-throughput flow-based platform will open new areas for their application and provide new tools for advancing their development. We demonstrate here a high-resolution spectral flow cytometer capable of acquiring Raman spectra of individual SERS-tags at flow rates of hundreds of particles per second, while maintaining the spectral resolution required to make full use of the detailed information encoded in the Raman signature for advanced multiplexing needs. The approach allows multiple optical parameters to be acquired simultaneously over thousands of individual nanoparticle tags. Characteristics such as tag size, brightness, and spectral uniformity are correlated on a per-particle basis. The tags evaluated here display highly uniform spectral signatures, but with greater variability in brightness. Subpopulations in the SERS response, not apparent in ensemble measurements, are also shown to exist. Relating tag variability to synthesis parameters makes flow-based spectral characterization a powerful tool for advancing particle development through its ability to provide rapid feedback on strategies aimed at constraining desired tag properties. Evidence for single-tag signal saturation at high excitation power densities is also shown, suggesting a role for high-throughput investigation of fundamental properties of the SERS tags as well.
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Affiliation(s)
- Gregory Goddard
- National Flow Cytometry Resource, Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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