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Payne TD, Klawa SJ, Jian T, Wang Q, Kim SH, Freeman R, Schultz ZD. From the lab to the field: handheld surface enhanced Raman spectroscopy (SERS) detection of viral proteins. SENSORS & DIAGNOSTICS 2023; 2:1483-1491. [PMID: 38013762 PMCID: PMC10633093 DOI: 10.1039/d3sd00111c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 07/28/2023] [Indexed: 11/29/2023]
Abstract
Translating sensors from the lab benchtop to a readily available point-of-need setting is desirable for many fields, including medicine, agriculture, and industry. However, this transition generally suffers from loss of sensitivity, high background signals, and other issues which can impair reproducibility. Here we adapt a label-free surface-enhanced Raman spectroscopy (SERS) sensor for SARS-CoV-2 antigens from a lab-based assay to a handheld device. Utilizing a peptide capture molecule, which we previously employed for a surface-based assay, we optimize a simpler and more cost-efficient nanoparticle-based assay. This new assay allows for the direct detection of these viral antigens by SERS, now with the advantages of robustness and portability. We highlight considerations for nanoparticle modification conditions and warn against methods which can interfere with accurate detection. The comparison of these two assays will help guide further development of SERS-based sensors into devices that can be easily used in point-of-care settings, such as by emergency room nurses, farmers, or quality control technicians.
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Affiliation(s)
- Taylor D Payne
- Department of Chemistry and Biochemistry, The Ohio State University Columbus Ohio 43210 USA
| | - Stephen J Klawa
- Department of Applied Physical Sciences, University of North Carolina Chapel Hill North Carolina 27599 USA
| | - Tengyue Jian
- Department of Applied Physical Sciences, University of North Carolina Chapel Hill North Carolina 27599 USA
| | - Qunzhao Wang
- Department of Applied Physical Sciences, University of North Carolina Chapel Hill North Carolina 27599 USA
| | - Sang Hoon Kim
- Department of Applied Physical Sciences, University of North Carolina Chapel Hill North Carolina 27599 USA
| | - Ronit Freeman
- Department of Applied Physical Sciences, University of North Carolina Chapel Hill North Carolina 27599 USA
| | - Zachary D Schultz
- Department of Chemistry and Biochemistry, The Ohio State University Columbus Ohio 43210 USA
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Sultangaziyev A, Ilyas A, Dyussupova A, Bukasov R. Trends in Application of SERS Substrates beyond Ag and Au, and Their Role in Bioanalysis. BIOSENSORS 2022; 12:bios12110967. [PMID: 36354477 PMCID: PMC9688019 DOI: 10.3390/bios12110967] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/26/2022] [Accepted: 10/30/2022] [Indexed: 05/31/2023]
Abstract
This article compares the applications of traditional gold and silver-based SERS substrates and less conventional (Pd/Pt, Cu, Al, Si-based) SERS substrates, focusing on sensing, biosensing, and clinical analysis. In recent decades plethora of new biosensing and clinical SERS applications have fueled the search for more cost-effective, scalable, and stable substrates since traditional gold and silver-based substrates are quite expensive, prone to corrosion, contamination and non-specific binding, particularly by S-containing compounds. Following that, we briefly described our experimental experience with Si and Al-based SERS substrates and systematically analyzed the literature on SERS on substrate materials such as Pd/Pt, Cu, Al, and Si. We tabulated and discussed figures of merit such as enhancement factor (EF) and limit of detection (LOD) from analytical applications of these substrates. The results of the comparison showed that Pd/Pt substrates are not practical due to their high cost; Cu-based substrates are less stable and produce lower signal enhancement. Si and Al-based substrates showed promising results, particularly in combination with gold and silver nanostructures since they could produce comparable EFs and LODs as conventional substrates. In addition, their stability and relatively low cost make them viable alternatives for gold and silver-based substrates. Finally, this review highlighted and compared the clinical performance of non-traditional SERS substrates and traditional gold and silver SERS substrates. We discovered that if we take the average sensitivity, specificity, and accuracy of clinical SERS assays reported in the literature, those parameters, particularly accuracy (93-94%), are similar for SERS bioassays on AgNP@Al, Si-based, Au-based, and Ag-based substrates. We hope that this review will encourage research into SERS biosensing on aluminum, silicon, and some other substrates. These Al and Si based substrates may respond efficiently to the major challenges to the SERS practical application. For instance, they may be not only less expensive, e.g., Al foil, but also in some cases more selective and sometimes more reproducible, when compared to gold-only or silver-only based SERS substrates. Overall, it may result in a greater diversity of applicable SERS substrates, allowing for better optimization and selection of the SERS substrate for a specific sensing/biosensing or clinical application.
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3
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Bonati C, Fay V, Dornier R, Loterie D, Moser C. Lock-in Raman difference spectroscopy. OPTICS EXPRESS 2022; 30:28601-28613. [PMID: 36299052 DOI: 10.1364/oe.461246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 06/30/2022] [Indexed: 06/16/2023]
Abstract
Shifted Excitation Raman Difference Spectroscopy (SERDS) is a non-destructive chemical analysis method capable of removing the fluorescence background and other disturbances from the Raman spectrum, thanks to the independence of the fluorescence with respect to the small difference in excitation wavelength. The spectrum difference is computed in a post-processing step. Here, we demonstrate the use of a lock-in camera to obtain an on-line analog SERDS spectra allowing longer exposure times and no saturation, leading to an improved Signal-to-Noise Ratio (SNR) and reduced data storage. Two configurations are presented: the first one uses a single laser and can remove excitation-independent disturbances, such as ambient light; the second employs two-wavelength shifted sources and removes fluorescence background similarly to SERDS. In both cases, we experimentally extrapolate the expected SNR improvement.
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Weng S, Lin D, Lai S, Tao H, Chen T, Peng M, Qiu S, Feng S. Highly sensitive and reliable detection of microRNA for clinically disease surveillance using SERS biosensor integrated with catalytic hairpin assembly amplification technology. Biosens Bioelectron 2022; 208:114236. [DOI: 10.1016/j.bios.2022.114236] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/22/2022] [Accepted: 03/29/2022] [Indexed: 12/13/2022]
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Li Y, Choe M, Jin S, Luo D, Bakharev PV, Seong WK, Ding F, Lee Z, Ruoff RS. Silica Particle-Mediated Growth of Single Crystal Graphene Ribbons on Cu(111) Foil. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2202536. [PMID: 35585685 DOI: 10.1002/smll.202202536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Indexed: 06/15/2023]
Abstract
The authors report the growth of micrometer-long single-crystal graphene ribbons (GRs) (tapered when grown above 900 °C, but uniform width when grown in the range 850 °C to 900 °C) using silica particle seeds on single crystal Cu(111) foil. Tapered graphene ribbons grow strictly along the Cu<101> direction on Cu(111) and polycrystalline copper (Cu) foils. Silica particles on both Cu foils form (semi-)molten Cu-Si-O droplets at growth temperatures, then catalyze nucleation and drive the longitudinal growth of graphene ribbons. Longitudinal growth is likely by a vapor-liquid-solid (VLS) mechanism but edge growth (above 900 °C) is due to catalytic activation of ethylene (C2 H4 ) and attachment of C atoms or species ("vapor solid" or VS growth) at the edges. It is found, based on the taper angle of the graphene ribbon, that the taper angle is determined by the growth temperature and the growth rates are independent of the particle size. The activation enthalpy (1.73 ± 0.03 eV) for longitudinal ribbon growth on Cu(111) from ethylene is lower than that for VS growth at the edges of the GRs (2.78 ± 0.15 eV) and for graphene island growth (2.85 ± 0.07 eV) that occurs concurrently.
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Affiliation(s)
- Yunqing Li
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Myeonggi Choe
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Sunghwan Jin
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Da Luo
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Pavel V Bakharev
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Won Kyung Seong
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
| | - Feng Ding
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Zonghoon Lee
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Rodney S Ruoff
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, 44919, Republic of Korea
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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Arbuz A, Sultangaziyev A, Rapikov A, Kunushpayeva Z, Bukasov R. How gap distance between gold nanoparticles in dimers and trimers on metallic and non-metallic SERS substrates can impact signal enhancement. NANOSCALE ADVANCES 2021; 4:268-280. [PMID: 36132951 PMCID: PMC9417094 DOI: 10.1039/d1na00114k] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 11/08/2021] [Indexed: 06/02/2023]
Abstract
The impact of variation in the interparticle gaps in dimers and trimers of gold nanoparticles (AuNPs), modified with Raman reporter (2-MOTP), on surface-enhanced Raman scattering (SERS) intensity, relative to the SERS intensity of a single AuNP, is investigated in this paper. The dimers, trimers, and single particles are investigated on the surfaces of four substrates: gold (Au), aluminium (Al), silver (Ag) film, and silicon (Si) wafer. The interparticle distance between AuNPs was tuned by selecting mercaptocarboxylic acids of various carbon chain lengths when each acid forms a mixed SAM with 2-MOTP. The SERS signal quantification was accomplished by combining maps of SERS intensity from a Raman microscope, optical microscope images (×100), and maps/images from AFM or SEM. In total, we analysed 1224 SERS nanoantennas (533 dimers, 648 monomers, and 43 trimers). The average interparticle gaps were measured using TEM. We observed inverse exponential trends for the Raman intensity ratio and enhancement factor ratio versus gap distance on all substrates. Gold substrate, followed by silicon, showed the highest Raman intensity ratio (9) and dimer vs. monomer enhancement factor ratio (up to 4.5), in addition to the steepest inverse exponential curve. The results may help find a balance between SERS signal reproducibility and signal intensity that would be beneficial for future agglomerated NPs in SERS measurements. The developed method of 3 to 1 map combination by an increase in image transparency can be used to study structure-activity relationships on various substrates in situ, and it can be applied beyond SERS microscopy.
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Affiliation(s)
- Alexandr Arbuz
- Chemistry Department, SSH, Nazarbayev University Nur-Sultan Kazakhstan
| | | | - Alisher Rapikov
- Chemistry Department, SSH, Nazarbayev University Nur-Sultan Kazakhstan
| | | | - Rostislav Bukasov
- Chemistry Department, SSH, Nazarbayev University Nur-Sultan Kazakhstan
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7
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Recent advances in optical biosensors for the detection of cancer biomarker α-fetoprotein (AFP). Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2020.115920] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Au@Ag core-shell nanoparticles for microRNA-21 determination based on duplex-specific nuclease signal amplification and surface-enhanced Raman scattering. Mikrochim Acta 2020; 187:384. [DOI: 10.1007/s00604-020-04330-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 05/15/2020] [Indexed: 12/18/2022]
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Amendola V. Correlation of surface-enhanced Raman scattering (SERS) with the surface density of gold nanoparticles: evaluation of the critical number of SERS tags for a detectable signal. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1016-1023. [PMID: 31165028 PMCID: PMC6541332 DOI: 10.3762/bjnano.10.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 05/03/2019] [Indexed: 05/26/2023]
Abstract
The use of plasmonic nanotags based on the surface-enhanced Raman scattering (SERS) effect is highly promising for several applications in analytical chemistry, biotechnological assays and nanomedicine. To this end, a crucial parameter is the minimum number of SERS tags that allows for the collection of intense Raman signals under real operating conditions. Here, SERS Au nanotags (AuNTs) based on clustered gold nanoparticles are deposited on a substrate and analyzed in the same region using Raman spectroscopy and transmission electron microscopy. In this way, the Raman spectra and the surface density of the SERS tags are correlated directly, showing that 1 tag/µm2 is enough to generate an intense signal above the noise level at 633 nm with an excitation power of only 0.65 mW and an acquisition time of just 1 s with a 50× objective. The AuNT density can be even lower than 1 tag/µm2 when the acquisition time is extended to 10 s, but must be increased to 3 tags/µm2 when a 20× objective is employed under the same excitation conditions. In addition, in order to observe a linear response, it was found that 10 SERS AuNTs inside the probed area are required. These findings indicate that a better signal-to-noise ratio requires high-magnification optics, while linearity versus tag number can be improved by using low-magnification optics or a high tag density. In general the suitability of plasmonic SERS labels for ultrasensitive analytical and biomedical applications is evident.
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Affiliation(s)
- Vincenzo Amendola
- Department of Chemical Sciences, University of Padova, Padova, Italy
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10
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Kukushkin VI, Ivanov NM, Novoseltseva AA, Gambaryan AS, Yaminsky IV, Kopylov AM, Zavyalova EG. Highly sensitive detection of influenza virus with SERS aptasensor. PLoS One 2019; 14:e0216247. [PMID: 31022287 PMCID: PMC6483365 DOI: 10.1371/journal.pone.0216247] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/16/2019] [Indexed: 12/20/2022] Open
Abstract
Highly sensitive and rapid technology of surface enhanced Raman scattering (SERS) was applied to create aptasensors for influenza virus detection. SERS achieves 106−109 times signal amplification, yielding excellent sensitivity, whereas aptamers to hemagglutinin provide a specific recognition of the influenza virus. Aptamer RHA0385 was demonstrated to have essentially broad strain-specificity toward both recombinant hemagglutinins and the whole viruses. To achieve high sensitivity, a sandwich of primary aptamers, influenza virus and secondary aptamers was assembled. Primary aptamers were attached to metal particles of a SERS substrate, and influenza viruses were captured and bound with secondary aptamers labelled with Raman-active molecules. The signal was affected by the concentration of both primary and secondary aptamers. The limit of detection was as low as 1 · 10−4 hemagglutination units per probe as tested for the H3N2 virus (A/England/42/72). Aptamer-based sensors provided recognition of various influenza viral strains, including H1, H3, and H5 hemagglutinin subtypes. Therefore, the aptasensors could be applied for fast and low-cost strain-independent determination of influenza viruses.
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Affiliation(s)
- Vladimir I. Kukushkin
- Institute of Solid State Physics RAS, Chernogolovka, Moscow district, Russian Federation
| | - Nikita M. Ivanov
- Chemistry Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | | | - Alexandra S. Gambaryan
- Chumakov Federal Scientific Center for Research and Development of Immune and Biological Products RAS, Moscow, Russian Federation
| | - Igor V. Yaminsky
- Chemistry Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Alexey M. Kopylov
- Chemistry Department, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Elena G. Zavyalova
- Chemistry Department, Lomonosov Moscow State University, Moscow, Russian Federation
- * E-mail:
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11
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Markwalter C, Kantor AG, Moore CP, Richardson KA, Wright DW. Inorganic Complexes and Metal-Based Nanomaterials for Infectious Disease Diagnostics. Chem Rev 2019; 119:1456-1518. [PMID: 30511833 PMCID: PMC6348445 DOI: 10.1021/acs.chemrev.8b00136] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Indexed: 12/12/2022]
Abstract
Infectious diseases claim millions of lives each year. Robust and accurate diagnostics are essential tools for identifying those who are at risk and in need of treatment in low-resource settings. Inorganic complexes and metal-based nanomaterials continue to drive the development of diagnostic platforms and strategies that enable infectious disease detection in low-resource settings. In this review, we highlight works from the past 20 years in which inorganic chemistry and nanotechnology were implemented in each of the core components that make up a diagnostic test. First, we present how inorganic biomarkers and their properties are leveraged for infectious disease detection. In the following section, we detail metal-based technologies that have been employed for sample preparation and biomarker isolation from sample matrices. We then describe how inorganic- and nanomaterial-based probes have been utilized in point-of-care diagnostics for signal generation. The following section discusses instrumentation for signal readout in resource-limited settings. Next, we highlight the detection of nucleic acids at the point of care as an emerging application of inorganic chemistry. Lastly, we consider the challenges that remain for translation of the aforementioned diagnostic platforms to low-resource settings.
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Affiliation(s)
| | | | | | | | - David W. Wright
- Department of Chemistry, Vanderbilt
University, Nashville, Tennessee 37235, United States
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Eremina OE, Semenova AA, Sergeeva EA, Brazhe NA, Maksimov GV, Shekhovtsova TN, Goodilin EA, Veselova IA. Surface-enhanced Raman spectroscopy in modern chemical analysis: advances and prospects. RUSSIAN CHEMICAL REVIEWS 2018. [DOI: 10.1070/rcr4804] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Neng J, Li Y, Driscoll AJ, Wilson WC, Johnson PA. Detection of Multiple Pathogens in Serum Using Silica-Encapsulated Nanotags in a Surface-Enhanced Raman Scattering-Based Immunoassay. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:5707-5712. [PMID: 29733579 DOI: 10.1021/acs.jafc.8b00026] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A robust immunoassay based on surface-enhanced Raman scattering (SERS) has been developed to simultaneously detect trace quantities of multiple pathogenic antigens from West Nile virus, Rift Valley fever virus, and Yersinia pestis in fetal bovine serum. Antigens were detected by capture with silica-encapsulated nanotags and magnetic nanoparticles conjugated with polyclonal antibodies. The magnetic pull-down resulted in aggregation of the immune complexes, and the silica-encapsulated nanotags provided distinct spectra corresponding to each antigen captured. The limit of detection was ∼10 pg/mL in 20% fetal bovine serum, a significant improvement over previous studies in terms of sensitivity, level of multiplexing, and medium complexity. This highly sensitive multiplex immunoassay platform provides a promising method to detect various antigens directly in crude serum samples without the tedious process of sample preparation, which is desirable for on-site diagnostic testing and real-time disease monitoring.
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Affiliation(s)
- Jing Neng
- Department of Chemical Engineering , University of Wyoming , Laramie , Wyoming 82071 , United States
| | - Yina Li
- Department of Chemical Engineering , University of Wyoming , Laramie , Wyoming 82071 , United States
| | - Ashley J Driscoll
- Department of Chemical Engineering , University of Wyoming , Laramie , Wyoming 82071 , United States
| | - William C Wilson
- Arthropod-Borne Animal Diseases Research Unit, Center for Grain and Animal Health Research, Agricultural Research Service (ARS) , United States Department of Agriculture (USDA) , Manhattan , Kansas 66502 , United States
| | - Patrick A Johnson
- Department of Chemical Engineering , University of Wyoming , Laramie , Wyoming 82071 , United States
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Ferhan AR, Jackman JA, Park JH, Cho NJ, Kim DH. Nanoplasmonic sensors for detecting circulating cancer biomarkers. Adv Drug Deliv Rev 2018; 125:48-77. [PMID: 29247763 DOI: 10.1016/j.addr.2017.12.004] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/29/2017] [Accepted: 12/08/2017] [Indexed: 12/20/2022]
Abstract
The detection of cancer biomarkers represents an important aspect of cancer diagnosis and prognosis. Recently, the concept of liquid biopsy has been introduced whereby diagnosis and prognosis are performed by means of analyzing biological fluids obtained from patients to detect and quantify circulating cancer biomarkers. Unlike conventional biopsy whereby primary tumor cells are analyzed, liquid biopsy enables the detection of a wide variety of circulating cancer biomarkers, including microRNA (miRNA), circulating tumor DNA (ctDNA), proteins, exosomes and circulating tumor cells (CTCs). Among the various techniques that have been developed to detect circulating cancer biomarkers, nanoplasmonic sensors represent a promising measurement approach due to high sensitivity and specificity as well as ease of instrumentation and operation. In this review, we discuss the relevance and applicability of three different categories of nanoplasmonic sensing techniques, namely surface plasmon resonance (SPR), localized surface plasmon resonance (LSPR) and surface-enhanced Raman scattering (SERS), for the detection of different classes of circulating cancer biomarkers.
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Affiliation(s)
- Abdul Rahim Ferhan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Jae Hyeon Park
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
| | - Dong-Hwan Kim
- School of Chemical Engineering, Sungkyunkwan University, 16419, Republic of Korea.
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Farka Z, Juřík T, Kovář D, Trnková L, Skládal P. Nanoparticle-Based Immunochemical Biosensors and Assays: Recent Advances and Challenges. Chem Rev 2017; 117:9973-10042. [DOI: 10.1021/acs.chemrev.7b00037] [Citation(s) in RCA: 414] [Impact Index Per Article: 59.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Zdeněk Farka
- Central
European Institute of Technology (CEITEC), ‡Department of Biochemistry, Faculty
of Science, and §Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Tomáš Juřík
- Central
European Institute of Technology (CEITEC), ‡Department of Biochemistry, Faculty
of Science, and §Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - David Kovář
- Central
European Institute of Technology (CEITEC), ‡Department of Biochemistry, Faculty
of Science, and §Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Libuše Trnková
- Central
European Institute of Technology (CEITEC), ‡Department of Biochemistry, Faculty
of Science, and §Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Petr Skládal
- Central
European Institute of Technology (CEITEC), ‡Department of Biochemistry, Faculty
of Science, and §Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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16
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Wang C, Madiyar F, Yu C, Li J. Detection of extremely low concentration waterborne pathogen using a multiplexing self-referencing SERS microfluidic biosensor. J Biol Eng 2017; 11:9. [PMID: 28289439 PMCID: PMC5310000 DOI: 10.1186/s13036-017-0051-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 02/02/2017] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND It is challenging to achieve ultrasensitive and selective detection of waterborne pathogens at extremely low levels (i.e., single cell/mL) using conventional methods. Even with molecular methods such as ELISA or PCR, multi-enrichment steps are needed which are labor and cost intensive. In this study, we incorporated nano-dielectrophoretic microfluidic device with Surface enhanced Raman scattering (SERS) technique to build a novel portable biosensor for easy detection and characterization of Escherichia coli O157:H7 at high sensitivity level (single cell/mL). RESULTS A multiplexing dual recognition SERS scheme was developed to achieve one-step target detection without the need to separate target-bound probes from unbound ones. With three different SERS-tagged molecular probes targeting different epitopes of the same pathogen being deployed simultaneously, detection of pathogen targets was achieved at single cell level with sub-species specificity that has not been reported before in single-step pathogen detection. CONCLUSION The self-referencing protocol implements with a Nano-dielectrophoretic microfluidic device potentially can become an easy-to-use, field-deployable spectroscopic sensor for onsite detection of pathogenic microorganisms.
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Affiliation(s)
- Chao Wang
- Agricultural and Biosystems Engineering Department, Iowa State University, Ames, IA 50011 USA
| | - Foram Madiyar
- Chemistry department, Kansas State University, Manhattan, KS 66506 USA
| | - Chenxu Yu
- Agricultural and Biosystems Engineering Department, Iowa State University, Ames, IA 50011 USA
| | - Jun Li
- Chemistry department, Kansas State University, Manhattan, KS 66506 USA
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Wiriyakun N, Pankhlueab K, Boonrungsiman S, Laocharoensuk R. Site-Selective Controlled Dealloying Process of Gold-Silver Nanowire Array: a Simple Approach towards Long-Term Stability and Sensitivity Improvement of SERS Substrate. Sci Rep 2016; 6:39115. [PMID: 27958367 PMCID: PMC5153644 DOI: 10.1038/srep39115] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/17/2016] [Indexed: 12/02/2022] Open
Abstract
Limitations of achieving highly sensitive and stable surface-enhanced Raman scattering (SERS) substrate greatly concern the suitable method for fabrication of large-area plasmonic nanostructures. Herein we report a simple approach using template-based synthesis to create a highly ordered two-dimensional array of gold-silver alloy nanowires, followed by the controlled dealloying process. This particular step of mild acid etching (15%v/v nitric acid for 5 min) allowed the formation of Raman hot spots on the nanowire tips while maintaining the integrity of highly active alloy composition and rigid nanowire array structure. Full consideration of SERS substrate performance was accomplished using 4-mercaptobenzoic acid (4-MBA) as a probe molecule. Exceedingly higher SERS signal (150-fold) can be achieved with respect to typical gold film substrate. Moreover, an excellent stability of SERS substrate was also determined for over 3 months storage time. In contrast to the previous studies which stability improvement was accomplished at a cost of sensitivity reduction, the simultaneous improvement of sensitivity and stability makes the controlled dealloying process an excellent choice of SERS substrate fabrication. In addition, uniformity and reproducibility studies indicated satisfactory results with the acceptable values of relative standard deviation.
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Affiliation(s)
- Natta Wiriyakun
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
| | - Karuna Pankhlueab
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
| | - Suwimon Boonrungsiman
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
| | - Rawiwan Laocharoensuk
- National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
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18
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Liao W, Lu X. Determination of chemical hazards in foods using surface-enhanced Raman spectroscopy coupled with advanced separation techniques. Trends Food Sci Technol 2016. [DOI: 10.1016/j.tifs.2016.05.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Moraes Silva S, Tavallaie R, Sandiford L, Tilley RD, Gooding JJ. Gold coated magnetic nanoparticles: from preparation to surface modification for analytical and biomedical applications. Chem Commun (Camb) 2016; 52:7528-40. [PMID: 27182032 DOI: 10.1039/c6cc03225g] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Gold coated magnetic nanoparticles (Au@MNPs) have become increasingly interesting to nanomaterial scientists due to their multifunctional properties and their potential in both analytical chemistry and nanomedicine. The past decade has seen significant progress in the synthesis and surface modification of Au@MNPs. This progress is based on advances in the preparation and characterization of iron/iron oxide nanocrystals with the required surface functional groups. In this critical review, we summarize recent developments in the methods of preparing Au@MNPs, surface functionalization and their application in analytical sensing and biomedicine. We highlight some of the remaining major challenges, as well as the lessons learnt when working with Au@MNPs.
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Affiliation(s)
- Saimon Moraes Silva
- School of Chemistry and Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia.
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20
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Chao J, Cao W, Su S, Weng L, Song S, Fan C, Wang L. Nanostructure-based surface-enhanced Raman scattering biosensors for nucleic acids and proteins. J Mater Chem B 2016; 4:1757-1769. [PMID: 32263053 DOI: 10.1039/c5tb02135a] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Detection of nucleic acid and protein targets related to human health and safety has attracted widespread attention. Surface-enhanced Raman scattering (SERS) is a powerful tool for biomarker detection because of its ultrahigh detection sensitivity and unique fingerprinting spectra. In this review, we first introduce the development of nanostructure-based SERS-active substrates and SERS nanotags, which greatly influence the performance of SERS biosensors. We then focus on recent advances in SERS biosensors for DNA, microRNA and protein determination, including label-free, labeled and multiplex analyses as well as in vivo imaging. Finally, the prospects and challenges of such nanostructure-based SERS biosensors are discussed.
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Affiliation(s)
- Jie Chao
- Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
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21
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Karn-orachai K, Sakamoto K, Laocharoensuk R, Bamrungsap S, Songsivilai S, Dharakul T, Miki K. Extrinsic surface-enhanced Raman scattering detection of influenza A virus enhanced by two-dimensional gold@silver core–shell nanoparticle arrays. RSC Adv 2016. [DOI: 10.1039/c6ra17143e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A surface enhanced Raman scattering (SERS) based biosensor using a direct immunoassay platform was demonstrated for influenza A detection. The sensitivity was improved ~4 times by using a well-tuned Au@Ag 2D array instead of a flat Au film.
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Affiliation(s)
- Kullavadee Karn-orachai
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
- Faculty of Pure and Applied Sciences
- University of Tsukuba
| | - Kenji Sakamoto
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | - Rawiwan Laocharoensuk
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA)
- Pathumthani 12120
- Thailand
| | - Suwussa Bamrungsap
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA)
- Pathumthani 12120
- Thailand
| | - Sirirurg Songsivilai
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA)
- Pathumthani 12120
- Thailand
| | - Tararaj Dharakul
- National Nanotechnology Center (NANOTEC)
- National Science and Technology Development Agency (NSTDA)
- Pathumthani 12120
- Thailand
- Department of Immunology
| | - Kazushi Miki
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
- Faculty of Pure and Applied Sciences
- University of Tsukuba
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22
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Dinda S, Suresh V, Thoniyot P, Balčytis A, Juodkazis S, Krishnamoorthy S. Engineering 3D Nanoplasmonic Assemblies for High Performance Spectroscopic Sensing. ACS APPLIED MATERIALS & INTERFACES 2015; 7:27661-27666. [PMID: 26523480 DOI: 10.1021/acsami.5b07745] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate the fabrication of plasmonic sensors that comprise gold nanopillar arrays exhibiting high surface areas, and narrow gaps, through self-assembly of amphiphilic diblock copolymer micelles on silicon substrates. Silicon nanopillars with high integrity over arbitrary large areas are obtained using copolymer micelles as lithographic templates. The gaps between metal features are controlled by varying the thickness of the evaporated gold. The resulting gold metal nanopillar arrays exhibit an engineered surface topography, together with uniform and controlled separations down to sub-10 nm suitable for highly sensitive detection of molecular analytes by Surface Enhanced Raman Spectroscopy (SERS). The significance of the approach is demonstrated through the control exercised at each step, including template preparation and pattern-transfer steps. The approach is a promising means to address trade-offs between resolutions, throughput, and performance in the fabrication of nanoplasmonic assemblies for sensing applications.
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Affiliation(s)
- S Dinda
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 3, Research Link, Singapore 117602, Singapore
- Department of Biotechnology, School of Pharmaceutical Sciences, Siksha O Anushandan University (SOA) , Bhubaneswar, 751030, India
| | - V Suresh
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 3, Research Link, Singapore 117602, Singapore
| | - P Thoniyot
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 3, Research Link, Singapore 117602, Singapore
- Singapore Bio imaging Consortium (SBIC), Biomedical Sciences Institutes , 11 Biopolis Way, #02-02, Helios 138667, Singapore
| | - A Balčytis
- Centre for Micro-Photonics, Faculty of Science Engineering and Technology, Swinburne University of Technology , Hawthorn, VIC 3122, Australia
- Institute of Physics, Centre for Physical Sciences and Technology , 231 Savanoriu Avenue, LT-02300 Vilnius, Lithuania
| | - S Juodkazis
- Centre for Micro-Photonics, Faculty of Science Engineering and Technology, Swinburne University of Technology , Hawthorn, VIC 3122, Australia
| | - S Krishnamoorthy
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 3, Research Link, Singapore 117602, Singapore
- Nano-Enabled Medicine and Cosmetics Group, Materials Research and Technology (MRT), Luxembourg Institute of Science and Technology (LIST) , 41, Rue du Brill, L-4422, Belvaux, Luxembourg
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23
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Microfluidics Integrated Biosensors: A Leading Technology towards Lab-on-a-Chip and Sensing Applications. SENSORS 2015; 15:30011-31. [PMID: 26633409 PMCID: PMC4721704 DOI: 10.3390/s151229783] [Citation(s) in RCA: 223] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 09/16/2015] [Accepted: 11/02/2015] [Indexed: 12/13/2022]
Abstract
A biosensor can be defined as a compact analytical device or unit incorporating a biological or biologically derived sensitive recognition element immobilized on a physicochemical transducer to measure one or more analytes. Microfluidic systems, on the other hand, provide throughput processing, enhance transport for controlling the flow conditions, increase the mixing rate of different reagents, reduce sample and reagents volume (down to nanoliter), increase sensitivity of detection, and utilize the same platform for both sample preparation and detection. In view of these advantages, the integration of microfluidic and biosensor technologies provides the ability to merge chemical and biological components into a single platform and offers new opportunities for future biosensing applications including portability, disposability, real-time detection, unprecedented accuracies, and simultaneous analysis of different analytes in a single device. This review aims at representing advances and achievements in the field of microfluidic-based biosensing. The review also presents examples extracted from the literature to demonstrate the advantages of merging microfluidic and biosensing technologies and illustrate the versatility that such integration promises in the future biosensing for emerging areas of biological engineering, biomedical studies, point-of-care diagnostics, environmental monitoring, and precision agriculture.
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24
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Madden O, Naughton MD, Moane S, Murray PG. Mycofabrication of common plasmonic colloids, theoretical considerations, mechanism and potential applications. Adv Colloid Interface Sci 2015; 225:37-52. [PMID: 26320607 DOI: 10.1016/j.cis.2015.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 08/09/2015] [Accepted: 08/10/2015] [Indexed: 01/12/2023]
Abstract
A coupling of the plasmon on the surface of metal nanoparticles with an incident photon enhances a broad range of useful optical phenomena, such as resonant light scattering (RLS), surface plasmon resonance (SPR) or Raman scattering. Due to these unique optical properties plasmonic nanostructures of different sizes and shapes have gained increasing popularity in areas such as cancer diagnosis, photothermal therapy as well as the imaging of living cells, detection of pathogens, biomolecules, metal ions, and the catalysis of various reactions in wet chemistry. This article reviews the current trends in the synthesis of plasmonic nanoparticles, particularly gold (AuNPs) and silver (AgNPs), using fungi as well as the proposed mechanisms for their mycofabrication. We provide an overview of the theoretical concepts of plasmonic nanoparticles which are sensitive electromagnetic responses that determine these nanoparticles applications.
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Affiliation(s)
- Olena Madden
- CHIMERA Research Group, Shannon ABC, Department of Applied Science, Limerick Institute of Technology, Moylish Park, Limerick, Ireland.
| | - Michael Daragh Naughton
- Bio-inspired Materials and TEMPO Research Groups, Department of Mechanical Engineering, Limerick Institute of Technology, Moylish Park, Limerick, Ireland
| | - Siobhan Moane
- CHIMERA Research Group, Shannon ABC, Department of Applied Science, Limerick Institute of Technology, Moylish Park, Limerick, Ireland
| | - Patrick G Murray
- CHIMERA Research Group, Shannon ABC, Department of Applied Science, Limerick Institute of Technology, Moylish Park, Limerick, Ireland
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25
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Cervo S, Mansutti E, Del Mistro G, Spizzo R, Colombatti A, Steffan A, Sergo V, Bonifacio A. SERS analysis of serum for detection of early and locally advanced breast cancer. Anal Bioanal Chem 2015; 407:7503-9. [DOI: 10.1007/s00216-015-8923-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 07/14/2015] [Accepted: 07/16/2015] [Indexed: 12/27/2022]
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26
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Niu Y, Huang T, Zhou Z, Xu G, Zhang L, Wei T. Formation of cyclodextrin monolayer through a host–guest interaction with tailor-made phenyltriethoxysilane self-assembled monolayer. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.01.088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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27
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Wang C, Yu C. Analytical characterization using surface-enhanced Raman scattering (SERS) and microfluidic sampling. NANOTECHNOLOGY 2015; 26:092001. [PMID: 25676092 DOI: 10.1088/0957-4484/26/9/092001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
With the rapid development of analytical techniques, it has become much easier to detect chemical and biological analytes, even at very low detection limits. In recent years, techniques based on vibrational spectroscopy, such as surface enhanced Raman spectroscopy (SERS), have been developed for non-destructive detection of pathogenic microorganisms. SERS is a highly sensitive analytical tool that can be used to characterize chemical and biological analytes interacting with SERS-active substrates. However, it has always been a challenge to obtain consistent and reproducible SERS spectroscopic results at complicated experimental conditions. Microfluidics, a tool for highly precise manipulation of small volume liquid samples, can be used to overcome the major drawbacks of SERS-based techniques. High reproducibility of SERS measurement could be obtained in continuous flow generated inside microfluidic devices. This article provides a thorough review of the principles, concepts and methods of SERS-microfluidic platforms, and the applications of such platforms in trace analysis of chemical and biological analytes.
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28
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Yüksel S, Schwenkbier L, Pollok S, Weber K, Cialla-May D, Popp J. Label-free detection of Phytophthora ramorum using surface-enhanced Raman spectroscopy. Analyst 2015; 140:7254-62. [DOI: 10.1039/c5an01156f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Label-free and species-specific detection of the plant pathogen Phytophthora ramorum from real samples employing SERS as an analytical tool.
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Affiliation(s)
- Sezin Yüksel
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Friedrich Schiller University Jena
- Institute of Physical Chemistry and Abbe Center of Photonics
| | - Lydia Schwenkbier
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Friedrich Schiller University Jena
- Institute of Physical Chemistry and Abbe Center of Photonics
| | - Sibyll Pollok
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Ernst-Abbe-Hochschule Jena
- University of Applied Sciences
| | - Karina Weber
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Friedrich Schiller University Jena
- Institute of Physical Chemistry and Abbe Center of Photonics
| | - Dana Cialla-May
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Friedrich Schiller University Jena
- Institute of Physical Chemistry and Abbe Center of Photonics
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology Jena (IPHT)
- 07745 Jena
- Germany
- Friedrich Schiller University Jena
- Institute of Physical Chemistry and Abbe Center of Photonics
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29
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Toccafondi C, Thorat S, La Rocca R, Scarpellini A, Salerno M, Dante S, Das G. Multifunctional substrates of thin porous alumina for cell biosensors. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:2411-2420. [PMID: 24573456 DOI: 10.1007/s10856-014-5178-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 02/12/2014] [Indexed: 06/03/2023]
Abstract
We have fabricated anodic porous alumina from thin films (100/500 nm) of aluminium deposited on technological substrates of silicon/glass, and investigated the feasibility of this material as a surface for the development of analytical biosensors aiming to assess the status of living cells. To this goal, porous alumina surfaces with fixed pitch and variable pore size were analyzed for various functionalities. Gold coated (about 25 nm) alumina revealed surface enhanced Raman scattering increasing with the decrease in wall thickness, with factor up to values of approximately 10(4) with respect to the flat gold surface. Bare porous alumina was employed for micro-patterning and observation via fluorescence images of dye molecules, which demonstrated the surface capability for a drug-loading device. NIH-3T3 fibroblast cells were cultured in vitro and examined after 2 days since seeding, and no significant (P > 0.05) differences in their proliferation were observed on porous and non-porous materials. The effect on cell cultures of pore size in the range of 50-130 nm--with pore pitch of about 250 nm--showed no significant differences in cell viability and similar levels in all cases as on a control substrate. Future work will address combination of all above capabilities into a single device.
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Affiliation(s)
- Chiara Toccafondi
- Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, 16163, Genoa, Italy,
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30
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Donnelly T, Smith WE, Faulds K, Graham D. Silver and magnetic nanoparticles for sensitive DNA detection by SERS. Chem Commun (Camb) 2014; 50:12907-10. [DOI: 10.1039/c4cc06335j] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The first reported combination of functionalised silver nanoparticles and silver-coated magnetic nanoparticles in a stable sandwich assay for DNA detection using SERS.
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Affiliation(s)
- Tara Donnelly
- Centre for Molecular Nanometrology
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL, UK
| | - W. Ewen Smith
- Centre for Molecular Nanometrology
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL, UK
| | - Karen Faulds
- Centre for Molecular Nanometrology
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL, UK
| | - Duncan Graham
- Centre for Molecular Nanometrology
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL, UK
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