1
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Trojanowicz R, Vestri A, Rippa M, Zyss J, Matczyszyn K, Petti L. DNA Antiadhesive Layer for Reusable Plasmonic Sensors: Nanostructure Pitch Effect. ACS OMEGA 2022; 7:31682-31690. [PMID: 36120011 PMCID: PMC9475616 DOI: 10.1021/acsomega.2c01370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A long-term reusable sensor that provides the opportunity to easily regenerate the active surface and minimize the occurrence of undesired absorption events is an appealing solution that helps to cut down the costs and improve the device performances. Impressive advances have been made in the past years concerning the development of novel cutting-edge sensors, but the reusability can currently represent a challenge. Direct shielding of the sensor surface is not always applicable, because it can impact the device performance. This study reports an antiadhesive layer (AAL) made of 90 mg/mL DNA sodium salt from salmon testes (ssstDNA) for passivating gold plasmonic sensor surfaces. Our gold two-dimensional (2D) nanostructured plasmonic metasurfaces modified with AAL were used for DNA quantification. AAL is thin enough that the plasmonic sensor remains sensitive to subsequent deposition of DNA, which serves as an analyte. AAL protects the gold surface from unwanted nonspecific adsorption by enabling wash-off of the deposited analyte after analysis and thus recovery of the LSPR peak position (rLSPR). The calibration curve obtained on a single nanostructure (Achiral Octupolar, 100 nm pitch) gave an LOD = 105 ng/mL and an extraordinary dynamic range, performances comparable or superior to those of commercial UV-vis spectrometers for acid nucleic dosage. Two different analytes were tested: ssstDNA (∼2000 bp) in deionized water and double-strand DNA (dsDNA) of 546-1614 bp in 100 mM Tris buffer and 10 mM MgCl2. The two nanostructures (Achiral Octupolar 25 and 100) were found to have the same sensitivity to DNA in deionized water but different sensitivity to DNA in a salt/buffer solution, opening a potential for solute discrimination. To the best of our knowledge, this is the first report on the use of AAL made of several kilobase-pairs-long dsDNA to produce a reusable plasmonic sensor. The working principle and limitations are drawn based on the LSPR and SERS study.
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Affiliation(s)
- Remigiusz
K. Trojanowicz
- Advanced
Materials Engineering and Modelling Group, Faculty of Chemistry, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Ambra Vestri
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - Massimo Rippa
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - Joseph Zyss
- LUMIN
Laboratory and Institut d’Alembert, Ecole Normale Supérieure
Paris-Saclay, CNRS, Université Paris-Saclay, 4, avenue des Sciences, 91190 Gif-sur-Yvette, France
| | - Katarzyna Matczyszyn
- Advanced
Materials Engineering and Modelling Group, Faculty of Chemistry, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
| | - Lucia Petti
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
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2
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Lucchetta DE, Di Donato A, Francescangeli O, Singh G, Castagna R. Light-Controlled Direction of Distributed Feedback Laser Emission by Photo-Mobile Polymer Films. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2890. [PMID: 36079928 PMCID: PMC9458089 DOI: 10.3390/nano12172890] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 08/17/2022] [Indexed: 05/14/2023]
Abstract
We report on the realization of Distributed Feedback (DFB) lasing by a high-resolution reflection grating integrated in a Photomobile Polymer (PMP) film. The grating is recorded in a recently developed holographic mixture basically containing halolakanes/acrylates and a fluorescent dye molecule (Rhodamine 6G). The PMP-mixture is placed around the grating spot and a subsequent curing/photo-polymerization process is promoted by UV-irradiation. Such a process brings to the simultaneous formation of the PMP-film and the covalent link of the PMP-film to the DFB-grating area (PMP-DFB system). The PMP-DFB allows lasing action when optically pumped with a nano-pulsed green laser source. Moreover, under a low-power light-irradiation the PMP-DFB bends inducing a spatial readdressing of the DFB-laser emission. This device is the first example of a light-controlled direction of a DFB laser emission. It could represent a novel disruptive optical technology in many fields of Science, making feasible the approach to free standing and light-controllable lasers.
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Affiliation(s)
| | - Andrea Di Donato
- Dip. DII, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Oriano Francescangeli
- Dip. SIMAU, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Gautam Singh
- Department of Applied Physics, Amity Institute of Applied Sciences, Amity University, Uttar Pradesh, Noida 201313, India
| | - Riccardo Castagna
- URT-CNR, Università di Camerino (UNICAM), Polo di Chimica, Via Sant’Agostino, 1, 62032 Camerino, Italy
- CNR, Institute of Heritage Science, Via Madonna del Piano, 10, 50019 Sesto Fiorentino, Italy
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3
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Zhao H, Zheng D, Wang H, Lin T, Liu W, Wang X, Lu W, Liu M, Liu W, Zhang Y, Liu M, Zhang P. In Situ Collection and Rapid Detection of Pathogenic Bacteria Using a Flexible SERS Platform Combined with a Portable Raman Spectrometer. Int J Mol Sci 2022; 23:7340. [PMID: 35806345 PMCID: PMC9267095 DOI: 10.3390/ijms23137340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 06/25/2022] [Accepted: 06/27/2022] [Indexed: 11/16/2022] Open
Abstract
This study aims to develop a simple, sensitive, low-cost, environmentally friendly and flexible surface-enhanced Raman scattering (SERS) platform, combined with a portable Raman spectrometer, for the rapid and on-site SERS detection of bacteria. Commercial tobacco packaging paper (TPP) with little background interference was used as a loading medium that effectively adsorbed Au nanoparticles and provided sufficient "hot spots". This Au-tobacco packaging paper (Au-TPP) substrate used as a flexible SERS platform can maximize sample collection by wiping irregular surfaces, and was successfully applied to the on-site and rapid detection of pathogenic bacteria. Raman fingerprints of pathogenic bacteria can be obtained by SERS detection of spiked pork using wipeable Au-TPP, which verifies its value in practical applications. The results collected by SERS were further verified by polymerase chain reaction (PCR) results. It showed several advantages in on-site SERS detection, including accurate discrimination, simple preparation, easy operation, good sensitivity, accuracy and reproducibility. This study indicates that the established flexible SERS platform has good practical applications in pathogenic bacterial identification and other rapid detections.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Ping Zhang
- Faculty of Environment and Life, Beijing International Science and Technology Cooperation Base of Antivirus Drug, Beijing University of Technology, Beijing 100124, China; (H.Z.); (D.Z.); (H.W.); (T.L.); (W.L.); (X.W.); (W.L.); (M.L.); (W.L.); (Y.Z.); (M.L.)
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4
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Rippa M, Sagnelli D, Vestri A, Marchesano V, Munari B, Carnicelli D, Varrone E, Brigotti M, Tozzoli R, Montalbano M, Morabito S, Zhou J, Zyss J, Petti L. Plasmonic Metasurfaces for Specific SERS Detection of Shiga Toxins. ACS APPLIED MATERIALS & INTERFACES 2022; 14:4969-4979. [PMID: 35044743 PMCID: PMC8815041 DOI: 10.1021/acsami.1c21553] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Accepted: 01/06/2022] [Indexed: 05/14/2023]
Abstract
The interest in the development of nanoscale plasmonic technologies has dramatically increased in recent years. The photonic properties of plasmonic nanopatterns can be controlled and tuned via their size, shape, or the arrangement of their constituents. In this work, we propose a 2D hybrid metallic polymeric nanostructure based on the octupolar framework with enhanced sensing property. We analyze its plasmonic features both numerically and experimentally, demonstrating the higher values of their relevant figures of merit: we estimated a surface-enhanced Raman spectroscopy (SERS) enhancement factor of 9 × 107 and a SPR bulk sensitivity of 430 nm/RIU. In addition, our nanostructure exhibits a dual resonance in the visible and near-infrared region, enabling our system toward multispectral plasmonic analysis. Finally, we illustrate our design engineering strategy as enabled by electron beam lithography by the outstanding performance of a SERS-based biosensor that targets the Shiga toxin 2a, a clinically relevant bacterial toxin. To the best of our knowledge, this is the first time that a SERS fingerprint of this toxin has been evidenced.
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Affiliation(s)
- M. Rippa
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - D. Sagnelli
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - A. Vestri
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - V. Marchesano
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
| | - B. Munari
- Dipartimento
di Medicina Specialistica, Diagnostica e Sperimentale, Sede di Patologia
Generale, Università di Bologna, 40126 Bologna, Italy
| | - D. Carnicelli
- Dipartimento
di Medicina Specialistica, Diagnostica e Sperimentale, Sede di Patologia
Generale, Università di Bologna, 40126 Bologna, Italy
| | - E. Varrone
- Dipartimento
di Medicina Specialistica, Diagnostica e Sperimentale, Sede di Patologia
Generale, Università di Bologna, 40126 Bologna, Italy
| | - M. Brigotti
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
- Dipartimento
di Medicina Specialistica, Diagnostica e Sperimentale, Sede di Patologia
Generale, Università di Bologna, 40126 Bologna, Italy
| | - R. Tozzoli
- Laboratorio
Nazionale di Riferimento per E. coli, Dipartimento di Sicurezza Alimentare,
Nutrizione e Sanità Pubblica Veterinaria, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - M. Montalbano
- Laboratorio
Nazionale di Riferimento per E. coli, Dipartimento di Sicurezza Alimentare,
Nutrizione e Sanità Pubblica Veterinaria, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - S. Morabito
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
- Laboratorio
Nazionale di Riferimento per E. coli, Dipartimento di Sicurezza Alimentare,
Nutrizione e Sanità Pubblica Veterinaria, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - J. Zhou
- Institute
of Photonics, Faculty of Science, Ningbo
University, 315211 Ningbo, People’s
Republic of China
| | - J. Zyss
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
- Lumière,
Matière et Interfaces (LUMIN) Laboratory, Institut d’Alembert,
Ecole Normale Supérieure Paris-Saclay, Université Paris Saclay, 91190 Gif sur Yvette, France
| | - L. Petti
- Institute
of Applied Sciences and Intelligent Systems “E. Caianiello”
of CNR, 80072 Pozzuoli, Italy
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5
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Vestri A, Rippa M, Marchesano V, Sagnelli D, Margheri G, Zhou J, Petti L. LSPR immuno-sensing based on iso-Y nanopillars for highly sensitive and specific imidacloprid detection. J Mater Chem B 2021; 9:9153-9161. [PMID: 34694310 DOI: 10.1039/d1tb01344k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Imidacloprid is the most widely used insecticide in agriculture and its intensive use over the last 30 years has caused a global concern due to its potentially toxic effects on the ecosystem. Considering the recent scientific interest in novel simple methods for imidacloprid analysis, we propose a label-free sensitive and specific localised surface plasmon resonance system for the detection of the insecticide based on 2D nanostructured metasurfaces with highly performing plasmonic properties. The specificity of the sensor proposed was achieved by covalent bio-functionalization of the metasurface using a smart and easy one-step procedure mediated by carbon disulphide. The biosensor produced was tested using a set of imidacloprid standard solutions showing a competitive limit of detection, lower than 1 ng mL-1. Our novel nanosensing configuration represents a valid and reliable solution to realize low-cost portable POC tests as an alternative to the laborious and expensive methods traditionally used for insecticide detection.
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Affiliation(s)
- Ambra Vestri
- Institute of Applied Sciences and Intelligent Systems "E. Caianiello" of CNR, Pozzuoli 80072, Italy.
| | - Massimo Rippa
- Institute of Applied Sciences and Intelligent Systems "E. Caianiello" of CNR, Pozzuoli 80072, Italy.
| | - Valentina Marchesano
- Institute of Applied Sciences and Intelligent Systems "E. Caianiello" of CNR, Pozzuoli 80072, Italy.
| | - Domenico Sagnelli
- Institute of Applied Sciences and Intelligent Systems "E. Caianiello" of CNR, Pozzuoli 80072, Italy.
| | | | - Jun Zhou
- Institute of Photonics, Faculty of Science, Ningbo University, Ningbo, People's Republic of China
| | - Lucia Petti
- Institute of Applied Sciences and Intelligent Systems "E. Caianiello" of CNR, Pozzuoli 80072, Italy.
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6
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Palermo G, Rippa M, Conti Y, Vestri A, Castagna R, Fusco G, Suffredini E, Zhou J, Zyss J, De Luca A, Petti L. Plasmonic Metasurfaces Based on Pyramidal Nanoholes for High-Efficiency SERS Biosensing. ACS APPLIED MATERIALS & INTERFACES 2021; 13:43715-43725. [PMID: 34469103 PMCID: PMC8447193 DOI: 10.1021/acsami.1c12525] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
An inverted pyramidal metasurface was designed, fabricated, and studied at the nanoscale level for the development of a label-free pathogen detection on a chip platform that merges nanotechnology and surface-enhanced Raman scattering (SERS). Based on the integration and synergy of these ingredients, a virus immunoassay was proposed as a relevant proof of concept for very sensitive detection of hepatitis A virus, for the first time to our best knowledge, in a very small volume (2 μL), without complex signal amplification, allowing to detect a minimal virus concentration of 13 pg/mL. The proposed work aims to develop a high-flux and high-accuracy surface-enhanced Raman spectroscopy (SERS) nanobiosensor for the detection of pathogens to provide an effective method for early and easy water monitoring, which can be fast and convenient.
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Affiliation(s)
- Giovanna Palermo
- Department
of Physics, University of Calabria, Via
P. Bucci, 87036 Rende, CS, Italy
- CNR
NANOTEC—Istituto di Nanotecnologia, UOS Cosenza, 87036 Rende, CS, Italy
| | - Massimo Rippa
- Institute
of Applied Sciences and Intelligent Systems ”E. Caianiello”
CNR, 80078 Pozzuoli, Italy
| | - Ylli Conti
- Department
of Physics, University of Calabria, Via
P. Bucci, 87036 Rende, CS, Italy
| | - Ambra Vestri
- Institute
of Applied Sciences and Intelligent Systems ”E. Caianiello”
CNR, 80078 Pozzuoli, Italy
| | - Riccardo Castagna
- Institute
of Applied Sciences and Intelligent Systems ”E. Caianiello”
CNR, 80078 Pozzuoli, Italy
| | - Giovanna Fusco
- Department
of Food Safety, Nutrition and Veterinary
Public Health, Istituto Superiore di Sanitá, 00161 Rome, Italy
| | - Elisabetta Suffredini
- Department
of Food Safety, Nutrition and Veterinary
Public Health, Istituto Superiore di Sanitá, 00161 Rome, Italy
| | - Jun Zhou
- Institute
of Photonics, Faculty of Science, Ningbo University, 315211 Ningbo, People’s Republic of China
| | - Joseph Zyss
- LUMIN Laboratory
(CNRS), Institut d’Alembert, Universitè Paris Saclay, 91190 Gif sur Yvette, France
| | - Antonio De Luca
- Department
of Physics, University of Calabria, Via
P. Bucci, 87036 Rende, CS, Italy
- CNR
NANOTEC—Istituto di Nanotecnologia, UOS Cosenza, 87036 Rende, CS, Italy
| | - Lucia Petti
- Institute
of Applied Sciences and Intelligent Systems ”E. Caianiello”
CNR, 80078 Pozzuoli, Italy
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7
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Kim DM, Park JS, Jung SW, Yeom J, Yoo SM. Biosensing Applications Using Nanostructure-Based Localized Surface Plasmon Resonance Sensors. SENSORS (BASEL, SWITZERLAND) 2021; 21:3191. [PMID: 34064431 PMCID: PMC8125509 DOI: 10.3390/s21093191] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 04/30/2021] [Accepted: 05/03/2021] [Indexed: 01/06/2023]
Abstract
Localized surface plasmon resonance (LSPR)-based biosensors have recently garnered increasing attention due to their potential to allow label-free, portable, low-cost, and real-time monitoring of diverse analytes. Recent developments in this technology have focused on biochemical markers in clinical and environmental settings coupled with advances in nanostructure technology. Therefore, this review focuses on the recent advances in LSPR-based biosensor technology for the detection of diverse chemicals and biomolecules. Moreover, we also provide recent examples of sensing strategies based on diverse nanostructure platforms, in addition to their advantages and limitations. Finally, this review discusses potential strategies for the development of biosensors with enhanced sensing performance.
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Affiliation(s)
- Dong Min Kim
- Center for Applied Life Science, Hanbat National University, Daejeon 34158, Korea;
| | - Jong Seong Park
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea; (J.S.P.); (S.-W.J.); (J.Y.)
| | - Seung-Woon Jung
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea; (J.S.P.); (S.-W.J.); (J.Y.)
| | - Jinho Yeom
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea; (J.S.P.); (S.-W.J.); (J.Y.)
| | - Seung Min Yoo
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea; (J.S.P.); (S.-W.J.); (J.Y.)
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8
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Zhu J, Lin G, Huang Y, Zhang K, Wu M, Wu W, Lu P. Three-dimensional cavity-coupled metamaterials for plasmonic color and real-time colorimetric biosensors. NANOSCALE 2020; 12:4418-4425. [PMID: 32026916 DOI: 10.1039/c9nr10343k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Plasmonic structure color has significant potential for visual biochemical sensing by simple instrumentation or even naked eye detection. Herein, we present a visual and real-time sensing strategy for refraction index sensing and detection of the biotin-avidin system based on three-dimensional cavity-coupled metamaterials. These metamaterials composed of a top array of gold disks, aluminium pillars and a bottom reflection film of aluminium have structures similar to the metal-insulator-metal structure. The insulating layer comprises air-gap cavities that are easily filled with gaseous or liquid dielectrics. Therefore, analytes can permeate into the nano-scale cavities and produce strong light-matter interactions. The sensor shows that any tiny change in the refraction index will induce a significant color variation and the sensitivity reaches 683.5 nm per refraction index unit with a figure of merit of 3.5. The color of the metamaterials changes from rose-red to violet and then loden after a monomolecular layer of thiolated biotin and streptavidin bind to the surface of the nanostructure successively. This sensing strategy offers new opportunities for the convenient detection of proteins, nucleic acids, and lipids.
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Affiliation(s)
- Jia Zhu
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, P.R. China.
| | - Guanzhou Lin
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, P.R. China.
| | - Yun Huang
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, P.R. China.
| | - Kenan Zhang
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, P.R. China. and College of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, P.R. China
| | - Meizhang Wu
- School of Automation, University of Science and Technology Beijing, Beijing 100083, P.R. China
| | - Wengang Wu
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, P.R. China.
| | - Peimin Lu
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, 350108, P.R. China
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9
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Huang Y, Zhu J, Fan J, Chen Z, Chen X, Jin S, Wu W. Plasmonic color generation and refractive index sensing with three-dimensional air-gap nanocavities. OPTICS EXPRESS 2019; 27:6283-6299. [PMID: 30876216 DOI: 10.1364/oe.27.006283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 02/07/2019] [Indexed: 05/19/2023]
Abstract
Three-dimensional (3D) air-gap metal-coated nanocavities with tunable geometries, changeable heights, and improved smoothness are fabricated by combining electron beam lithography (EBL), ultra dilute hydrofluoric acid solution wet etching (UDHFE), and metal magnetron sputtering technologies. With different shapes, heights, and separations of the nanocavities, the strong electromagnetic resonances inside the nanocavities are changed in different extent, resulting in broad gamut and sophisticated plasmonic color generation. The nanocavities-based metasurface is also used to construct a real-time and label-free refractive index sensor with 372 nm/RIU sensitivity, which shows distinct colorimetric change between different mediums. This nanocavities may find extensive potential applications in high-fidelity color printing, high-density information storage, and on-chip colorimetric label-free biomedical sensing.
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10
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Rippa M, Castagna R, Zhou J, Paradiso R, Borriello G, Bobeico E, Petti L. Dodecagonal plasmonic quasicrystals for phage-based biosensing. NANOTECHNOLOGY 2018; 29:405501. [PMID: 29998850 DOI: 10.1088/1361-6528/aad2f5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this work, we fabricate and characterize a novel sensitive two-dimensional surface enhanced Raman spectroscopy (SERS) substrate made of plasmonic nanocavities in a photonic quasicrystal arrangement characterized by a 12-fold rotational symmetry. Our SERS device is capable of detecting chemisorbed bacteriophages at a femtomolar range. Most importantly, the paper presents for the first time a study on the procedure to functionalize the plasmonic quasicrystal with bacteriophages of the Podoviridae family. The immobilization of the phages on the plasmonic substrate has been studied and verified through SERS measurements. A new stable peak, visible in the SERS spectra at 1326 cm-1 at a greater than 60 times amplification, confirms the immobilization of the phages on the substrate. This functionalization approach can be used also for other types of phages or plasmonic sensors and hence, our achievements could allow the development of novel systems for the specific detection of different species of bacteria.
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Affiliation(s)
- M Rippa
- Institute of Applied Sciences and Intelligent Systems 'E. Caianiello' of CNR, Pozzuoli, Italy
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11
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Zhu S, Li H, Yang M, Pang SW. Label-free detection of live cancer cells and DNA hybridization using 3D multilayered plasmonic biosensor. NANOTECHNOLOGY 2018; 29:365503. [PMID: 29848789 DOI: 10.1088/1361-6528/aac8fb] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Three-dimensional (3D) multilayered plasmonic nanostructures consisting of Au nanosquares on top of SU-8 nanopillars, Au asymmetrical nanostructures in the middle, and Au asymmetrical nanoholes at the bottom were fabricated through reversal nanoimprint technology. Compared with two-dimensional and quasi-3D plasmonic nanostructures, the 3D multilayered plasmonic nanostructures showed higher electromagnetic field intensity, longer plasmon decay length and larger plasmon sensing area, which are desirable for highly sensitive localized surface plasmonic resonance biosensors. The sensitivity and resonance peak wavelength of the 3D multilayered plasmonic nanostructures could be adjusted by varying the offset between the top and bottom SU-8 nanopillars from 31% to 56%, and the highest sensitivity of 382 and 442 nm/refractive index unit were observed for resonance peaks at 581 and 805 nm, respectively. Live lung cancer A549 cells with a low concentration of 5 × 103 cells ml-1 and a low sample volume of 2 μl could be detected by the 3D multilayered plasmonic nanostructures integrated in a microfluidic system. The 3D plasmonic biosensors also had the advantages of detecting DNA hybridization by capturing the complementary target DNA in the low concentration range of 10-14-10-7 M, and providing a large peak shift of 82 nm for capturing 10-7 M complementary target DNA without additional signal amplification.
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Affiliation(s)
- Shuyan Zhu
- Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong. Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong Kong, Kowloon, Hong Kong
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12
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Radhakrishnan R, Poltronieri P. Fluorescence-Free Biosensor Methods in Detection of Food Pathogens with a Special Focus on Listeria monocytogenes. BIOSENSORS 2017; 7:E63. [PMID: 29261134 PMCID: PMC5746786 DOI: 10.3390/bios7040063] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/11/2017] [Accepted: 12/18/2017] [Indexed: 12/16/2022]
Abstract
Food pathogens contaminate food products that allow their growth on the shelf and also under refrigerated conditions. Therefore, it is of utmost importance to lower the limit of detection (LOD) of the method used and to obtain the results within hours to few days. Biosensor methods exploit the available technologies to individuate and provide an approximate quantification of the bacteria present in a sample. The main bottleneck of these methods depends on the aspecific binding to the surfaces and on a change in sensitivity when bacteria are in a complex food matrix with respect to bacteria in a liquid food sample. In this review, we introduce surface plasmon resonance (SPR), new advancements in SPR techniques, and electrochemical impedance spectroscopy (EIS), as fluorescence-free biosensing technologies for detection of L. monocytogenes in foods. The application of the two methods has facilitated L. monocytogenes detection with LOD of 1 log CFU/mL. Further advancements are envisaged through the combination of biosensor methods with immunoseparation of bacteria from larger volumes, application of lab-on-chip technologies, and EIS sensing methods for multiplex pathogen detection. Validation efforts are being conducted to demonstrate the robustness of detection, reproducibility and variability in multi-site installations.
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