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Fu X, Sun Z, Ji S, Liu F, Feng M, Yoo BK, Zhu Y. Nanoscale-Femtosecond Imaging of Evanescent Surface Plasmons on Silver Film by Photon-Induced Near-Field Electron Microscopy. NANO LETTERS 2022; 22:2009-2015. [PMID: 35226510 DOI: 10.1021/acs.nanolett.1c04774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Surface plasmons on silver nanostructures have a broad range of tunable resonance properties in visible and near-infrared regimes, which possess wide applications in nanophotonics and optoelectronics. Here we use a femtosecond laser to excite surface plasmons on a silver film and trace the subsequent transient dynamics via photon-induced near-field electron microscopy (PINEM). A polarization experiment of PINEM demonstrates a conspicuous polarization dependence of the transient surface plasmon field on the silver film; however, unlike silver nanowires and nanorods, there is no polarization dependence for the PINEM intensity. This compelling finding suggests a thin film platform can be more easily used to identify the temporal and spatial overlaps between the pump laser and probe electron pulses in 4D ultrafast electron microscopy (UEM). Our work illustrates the femtosecond excitation and transient behavior of the surface plasmons on silver film and paves a universal, simple way for identifying the time zero in 4D UEM.
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Affiliation(s)
- Xuewen Fu
- Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
| | - Zepeng Sun
- Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
| | - Shaozheng Ji
- Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
| | - Fang Liu
- Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
| | - Min Feng
- Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071, China
| | - Byung-Kuk Yoo
- Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Yimei Zhu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
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Asghari A, Wang C, Yoo KM, Rostamian A, Xu X, Shin JD, Dalir H, Chen RT. Fast, accurate, point-of-care COVID-19 pandemic diagnosis enabled through advanced lab-on-chip optical biosensors: Opportunities and challenges. APPLIED PHYSICS REVIEWS 2021; 8:031313. [PMID: 34552683 PMCID: PMC8427516 DOI: 10.1063/5.0022211] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 05/21/2021] [Indexed: 05/14/2023]
Abstract
The sudden rise of the worldwide severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic in early 2020 has called into drastic action measures to perform instant detection and reduce the rate of spread. Common clinical and nonclinical diagnostic testing methods have been partially effective in satisfying the increasing demand for fast detection point-of-care (POC) methods to slow down further spread. However, accurate point-of-risk diagnosis of this emerging viral infection is paramount as the need for simultaneous standard operating procedures and symptom management of SARS-CoV-2 will be the norm for years to come. A sensitive, cost-effective biosensor with mass production capability is crucial until a universal vaccination becomes available. Optical biosensors can provide a noninvasive, extremely sensitive rapid detection platform with sensitivity down to ∼67 fg/ml (1 fM) concentration in a few minutes. These biosensors can be manufactured on a mass scale (millions) to detect the COVID-19 viral load in nasal, saliva, urine, and serological samples, even if the infected person is asymptotic. Methods investigated here are the most advanced available platforms for biosensing optical devices that have resulted from the integration of state-of-the-art designs and materials. These approaches include, but are not limited to, integrated optical devices, plasmonic resonance, and emerging nanomaterial biosensors. The lab-on-chip platforms examined here are suitable not only for SARS-CoV-2 spike protein detection but also for other contagious virions such as influenza and Middle East respiratory syndrome (MERS).
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Affiliation(s)
- Aref Asghari
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
| | - Chao Wang
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
| | - Kyoung Min Yoo
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
| | - Ali Rostamian
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA
| | - Xiaochuan Xu
- Omega Optics, Inc., 8500 Shoal Creek Blvd., Austin, Texas 78757, USA
| | - Jong-Dug Shin
- Omega Optics, Inc., 8500 Shoal Creek Blvd., Austin, Texas 78757, USA
| | - Hamed Dalir
- Omega Optics, Inc., 8500 Shoal Creek Blvd., Austin, Texas 78757, USA
| | - Ray T. Chen
- Author to whom correspondence should be addressed:
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Iwasaki Y, Seyama M, Matsuura N, Inoue S, Hayashi K, Koizumi H. Direct Measurement of Near-Wall Molecular Transport Rate in a Microchannel and Its Dependence on Diffusivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8687-8695. [PMID: 34270898 DOI: 10.1021/acs.langmuir.1c00561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Solute transport in a narrow space is the most elemental process in chromatography and biological pattern formation. However, the observation of such transport has been quite difficult, and theoretical investigations have therefore preponderated. Here, using a space- and time-resolved surface plasmon resonance (SPR) method, we measured the nanoscale near-wall (next to the wall) transport rate in a narrow channel after a solution and its solvent had come into contact. By combining the SPR method with a capillary injection method, which enables two solution plugs to flow immediately after they have made contact, we were able to measure the solute concentration evolution at the channel wall. We tested three combinations of two plugs of solution-water-glucose, sodium chloride-water, and glucose-sodium chloride-and succeeded in measuring diffusion-coefficient-dependent changes in the concentration of solute flowing through a rectangular microchannel in less than 0.4 s. A numerical analysis of this system revealed the acceleration of the solute/solution boundary moving on the wall and its deceleration at the center of the channel cross section. The observed experimental transport rate agreed with the numerical result quantitatively. These results show that the solute transport followed a laminar flow with a no-slip model and that the molecules were transported in the order of their diffusivity. In the third combination, when the two solutions made contact and started flowing, the interdiffusion of the solutes resulted in temporal concentrations lower than either of the solutions before contact, which indicated that the contact between the two solutions quickly led to separation by the advection-diffusion processes. We found that such a concentration profile could actually be measured. Our techniques are simple and applicable to a wide range of molecules; the method opens the way to direct observation of the space-time near-wall solute transport process and can be used for the rapid determination of diffusivity.
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Affiliation(s)
- Yuzuru Iwasaki
- NTT Device Technology Labs., NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
| | - Michiko Seyama
- NTT Device Technology Labs., NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
| | - Nobuaki Matsuura
- NTT Device Innovation Center, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
| | - Suzuyo Inoue
- NTT Device Technology Labs., NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
| | - Katsuyoshi Hayashi
- NTT Device Technology Labs., NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
| | - Hiroshi Koizumi
- NTT Device Innovation Center, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi Kanagawa 243-0198, Japan
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A lable-free SPR biosensor based on one peptide sequence with three recognition sites for O-GlcNAc transferase detection. Talanta 2021; 222:121664. [PMID: 33167279 DOI: 10.1016/j.talanta.2020.121664] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 09/07/2020] [Accepted: 09/11/2020] [Indexed: 12/24/2022]
Abstract
Abnormal O-linked N-acetylglucosamine (O-GlcNAc) concentrations have been associated with many diseases, but the lack of accurate detection method limited O-GlcNAc to be used as a biomarker in clinical diagnosis. Then O-GlcNAc transferase (OGT) has drawn researchers' attention as it closed related to the level of O-GlcNAc and be considered to be a promising new target for diseases diagnosis. Nevertheless, the existing OGT detection methods are either need labeling or the sensitity can not meet the needs of clinic testing. Herein, a label-free and sensitive SPR biosensor was developed for accurate detection of OGT based on a multi-functional peptide. The designed peptide contains three recognition sites, one is the cleavage site of protease K, one is the O-GlcNAcylated site by OGT, and another is six histidine which be used as the signal report probe to recognize Ni2+. The immobilized peptide would be cleavaged by proteinase K, then the His-tag residue part will leave the surface of Au film, resulting less His-tag could bind to Ni2+ and a small SPR signal would be record. If the peptide is O-GlcNAcylated by OGT, the cleaving reaction would be limited due to the adjacent site of O-GlcNAcylation. Then more His-tag can be left on the Au film and a bigger SPR signal could be record, this signal is associated with the concentration of OGT. Utilizing the change of the peptide configuration as a signal report probe for OGT detection not only avoids labeling of peptide, but also makes the method more sensitive. The determination linear range of OGT is from 2.00 × 10-13 to 5.00 × 10-8 M with a detection limit of 1.19 × 10-13 M, and the separation of two enzyme reactions ensured the high selectivity of the method. Finally, the sensing system was successfully used for OGT detection in blood samples with satisfied recovery. In summary, the label-free SPR platform for accurate detection of OGT in real samples is helpful to promote OGT serve as a biomarker for early clinical diagnosis of O-GlcNAc related diseases.
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Yin Z, Cheng X, Wang G, Chen J, Jin Y, Tu Q, Xiang J. SPR immunosensor combined with Ti 4+@TiP nanoparticles for the evaluation of phosphorylated alpha-synuclein level. Mikrochim Acta 2020; 187:509. [PMID: 32833087 DOI: 10.1007/s00604-020-04507-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 08/18/2020] [Indexed: 01/01/2023]
Abstract
A highly sensitive and specific surface plasmon resonance (SPR) method using one anti-alpha-synuclein antibody (anti-αS) and titanium phosphate nanoparticles (Ti4+@TiP) was developed for quantitative evaluation of phosphorylated αS level which was defined by the ratio of p-αS to total alpha-synuclein (t-αS) (p-αS/t-αS). The close affinities of anti-αS to αS (0.975 pM-1) and p-αS (0.938 pM-1) were obtained. Based on this fact , both αS forms were simultaneously captured and the t-αS was quantified using the anti-αS immobilized Au chip. With the selective recognition of Ti4+@TiP nanoparticles, the p-αS was quantified. The dynamic ranges of our method were 1.0~20.0 pg mL-1 for the detection of t-αS and 0.1~10.0 pg mL-1 for that of p-αS. The analysis of αS- and p-αS-spiked artificial cerebrospinal fluid samples revealed the high accuracy of the method. Furthermore, the concentrations of αS and p-αS in clinical CSF samples collected from three healthy donors were determined and displayed a high correlation with the results from a commercial ELISA kit, confirming the viability and of the proposed method. The method is convenient, economical, and practical for the evaluation of phosphorylated αS level with high sensitivity and selectivity. It is of great significance for the early diagnosis of PD and the evaluation of PD progression.Graphical abstract.
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Affiliation(s)
- Zhenzhen Yin
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Xiaoli Cheng
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Gan Wang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Jia Chen
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China
| | - Yan Jin
- Operation Center, The Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Qiuyun Tu
- Department of Geriatrics, The Fifth Affiliated Hospital of Sun Yat-Sen University, Zhuhai, 519000, China
| | - Juan Xiang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
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Singh S, Singh PK, Umar A, Lohia P, Albargi H, Castañeda L, Dwivedi DK. 2D Nanomaterial-Based Surface Plasmon Resonance Sensors for Biosensing Applications. MICROMACHINES 2020; 11:E779. [PMID: 32824184 PMCID: PMC7463818 DOI: 10.3390/mi11080779] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/08/2020] [Accepted: 08/10/2020] [Indexed: 12/19/2022]
Abstract
The absorption and binding energy of material plays an important role with a large surface area and conductivity for the development of any sensing device. The newly grown 2D nanomaterials like black phosphorus transition metal dichalcogenides (TMDCs) or graphene have excellent properties for sensing devices' fabrication. This paper summarizes the progress in the area of the 2D nanomaterial-based surface plasmon resonance (SPR) sensor during last decade. The paper also focuses on the structure of Kretschmann configuration, the sensing principle of SPR, its characteristic parameters, application in various fields, and some important recent works related to SPR sensors have also been discussed, based on the present and future scope of this field. The present paper provides a platform for researchers to work in the field of 2D nanomaterial-based SPR sensors.
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Affiliation(s)
- Sachin Singh
- Amorphous Semiconductor Research Lab, Department of Physics and Material Science, Madan Mohan Malaviya University of Technology, Gorakhpur 273010, India; (S.S.); (P.K.S.)
| | - Pravin Kumar Singh
- Amorphous Semiconductor Research Lab, Department of Physics and Material Science, Madan Mohan Malaviya University of Technology, Gorakhpur 273010, India; (S.S.); (P.K.S.)
| | - Ahmad Umar
- Department of Chemistry, Faculty of Science and Arts, Najran University, Najran 11001, Saudi Arabia
- Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia;
| | - Pooja Lohia
- Department of Electronics and Communication Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur 273010, India;
| | - Hasan Albargi
- Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia;
- Department of Physics, Faculty of Science and Arts, Najran University, Najran 11001, Saudi Arabia
| | - L. Castañeda
- Sección de Estudios de Posgrado e Investigación de la Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón S/N, Casco de Santo Tomas, Alcaldía Miguel Hidalgo, C.P. 11340 Cd. de México, Mexico;
| | - D. K. Dwivedi
- Amorphous Semiconductor Research Lab, Department of Physics and Material Science, Madan Mohan Malaviya University of Technology, Gorakhpur 273010, India; (S.S.); (P.K.S.)
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Anas NAA, Fen YW, Yusof NA, Omar NAS, Ramdzan NSM, Daniyal WMEMM. Investigating the Properties of Cetyltrimethylammonium Bromide/Hydroxylated Graphene Quantum Dots Thin Film for Potential Optical Detection of Heavy Metal Ions. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E2591. [PMID: 32517196 PMCID: PMC7321556 DOI: 10.3390/ma13112591] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 04/24/2020] [Accepted: 04/29/2020] [Indexed: 01/18/2023]
Abstract
The modification of graphene quantum dots (GQDs) may drastically enhance their properties, therefore resulting in various related applications. This paper reported the preparation of novel cetyltrimethylammonium bromide/hydroxylated graphene quantum dots (CTAB/HGQDs) thin film using the spin coating technique. The properties of the thin film were then investigated and studied. The functional groups existing in CTAB/HGQDs thin film were confirmed by the Fourier transform infrared (FTIR) spectroscopy, while the atomic force microscope (AFM) displayed a homogenous surface of the thin film with an increase in surface roughness upon modification. Optical characterizations using UV-Vis absorption spectroscopy revealed a high absorption with an optical band gap of 4.162 eV. Additionally, the photoluminescence (PL) spectra illustrated the maximum emission peak of CTAB/HGQDs thin film at a wavelength of 444 nm. The sensing properties of the as-prepared CTAB/HGQDs thin film were studied using a surface plasmon resonance technique towards the detection of several heavy metal ions (HMIs) (Zn2+, Ni2+, and Fe3+). This technique generated significant results and showed that CTAB/HGQDs thin film has great potential for HMIs detection.
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Affiliation(s)
- Nur Ain Asyiqin Anas
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; (N.A.A.A.); (N.A.S.O.); (W.M.E.M.M.D.)
- Physics Unit, Centre of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia
| | - Yap Wing Fen
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; (N.A.A.A.); (N.A.S.O.); (W.M.E.M.M.D.)
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia;
| | - Nor Azah Yusof
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia;
| | - Nur Alia Sheh Omar
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; (N.A.A.A.); (N.A.S.O.); (W.M.E.M.M.D.)
| | - Nur Syahira Md Ramdzan
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia;
| | - Wan Mohd Ebtisyam Mustaqim Mohd Daniyal
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia; (N.A.A.A.); (N.A.S.O.); (W.M.E.M.M.D.)
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Surface Plasmon Resonance Sensor Based on Polypyrrole–Chitosan–BaFe2O4 Nanocomposite Layer to Detect the Sugar. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10082855] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The surface plasmon resonance sensor was used to detect and measure low concentrations of sugar. A polypyrrole–chitosan–BaFe2O4 nanocomposite layer was prepared to improve the surface of the gold layer for the detection of glucose, fructose, and sucrose using the surface plasmon resonance technique. The polypyrrole–chitosan–BaFe2O4 was synthesized using the electrodeposition method in different thicknesses. The functional group, crystal structure, and morphology of the layer were investigated with Fourier transform infrared spectroscopy, X-ray diffraction technique, and field emission electron microscopy. Consequently, the BaFe2O4 was scattered on the surface of the polymer, and the affinity of polypyrrole–chitosan–BaFe2O4 to bond with glucose is higher than that for the other sugars. The sensor limit was 0.005 ppm.
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Luna-Moreno D, Sánchez-Álvarez A, Rodríguez-Delgado M. Optical Thickness Monitoring as a Strategic Element for the Development of SPR Sensing Applications. SENSORS (BASEL, SWITZERLAND) 2020; 20:s20071807. [PMID: 32218108 PMCID: PMC7181204 DOI: 10.3390/s20071807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 03/20/2020] [Accepted: 03/23/2020] [Indexed: 06/10/2023]
Abstract
The importance of the monitoring of thickness and rate deposition is indispensable for the fabrication of thin film sensors, such as SPR sensors. The sensitivity of SPR responses varies with the thickness of the film, as well as the linear range. Thus, in the present work, we presented an experimental study of the plasmonic response of Cr/Au thin films deposited onto glass slides by evaporation, based on both a rotation and no-rotation system. The results show that the thickness of the gold film varies from 240 to 620 Å, depending on the glass slide position. The SPR response curves obtained experimentally were compared with simulated plasmonic responses and different parameters such as resonance angle, and the depth, slope and half-width of the SPR curve were analysed.
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Affiliation(s)
- Donato Luna-Moreno
- Centro de Investigaciones en Óptica AC, Div. de Fotónica, Loma del Bosque 115, Col. Lomas del Campestre C.P. 37150, León, Gto, Mexico;
| | - Araceli Sánchez-Álvarez
- Universidad Tecnológica de León, Electromecánica Industrial, Blvd. Universidad Tecnológica #225, Col. San Carlos C.P. 37670, León, Gto, Mexico;
| | - Melissa Rodríguez-Delgado
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas. Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza C.P. 66455, Nuevo León, Mexico
- Centro de Investigación en Biotecnología y Nanotecnología (CIByN), Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Parque de Investigación e Innovación Tecnológica, Km. 10 autopista al Aeropuerto Internacional Mariano Escobedo, Apodaca 66629, Nuevo León, Mexico
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Anas NAA, Fen YW, Omar NAS, Daniyal WMEMM, Ramdzan NSM, Saleviter S. Development of Graphene Quantum Dots-Based Optical Sensor for Toxic Metal Ion Detection. SENSORS (BASEL, SWITZERLAND) 2019; 19:E3850. [PMID: 31489912 PMCID: PMC6766831 DOI: 10.3390/s19183850] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/02/2019] [Accepted: 08/13/2019] [Indexed: 02/08/2023]
Abstract
About 71% of the Earth's surface is covered with water. Human beings, animals, and plants need water in order to survive. Therefore, it is one of the most important substances that exist on Earth. However, most of the water resources nowadays are insufficiently clean, since they are contaminated with toxic metal ions due to the improper disposal of pollutants into water through industrial and agricultural activities. These toxic metal ions need to be detected as fast as possible so that the situation will not become more critical and cause more harm in the future. Since then, numerous sensing methods have been proposed, including chemical and optical sensors that aim to detect these toxic metal ions. All of the researchers compete with each other to build sensors with the lowest limit of detection and high sensitivity and selectivity. Graphene quantum dots (GQDs) have emerged as a highly potential sensing material to incorporate with the developed sensors due to the advantages of GQDs. Several recent studies showed that GQDs, functionalized GQDs, and their composites were able to enhance the optical detection of metal ions. The aim of this paper is to review the existing, latest, and updated studies on optical sensing applications of GQDs-based materials toward toxic metal ions and future developments of an excellent GQDs-based SPR sensor as an alternative toxic metal ion sensor.
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Affiliation(s)
- Nur Ain Asyiqin Anas
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Yap Wing Fen
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
| | - Nur Alia Sheh Omar
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | | | - Nur Syahira Md Ramdzan
- Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Silvan Saleviter
- Functional Devices Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
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Mahmoudpour M, Ezzati Nazhad Dolatabadi J, Torbati M, Homayouni-Rad A. Nanomaterials based surface plasmon resonance signal enhancement for detection of environmental pollutions. Biosens Bioelectron 2019; 127:72-84. [DOI: 10.1016/j.bios.2018.12.023] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/27/2018] [Accepted: 12/10/2018] [Indexed: 01/02/2023]
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Kolomenskii AA, Surovic E, Schuessler HA. Optical detection of acoustic waves with surface plasmons. APPLIED OPTICS 2018; 57:5604-5613. [PMID: 30118071 DOI: 10.1364/ao.57.005604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 06/05/2018] [Indexed: 06/08/2023]
Abstract
For broadband and sensitive detection of acoustic waves, the surface plasmon resonance (SPR) can be used, which responds to variations of dielectric properties in close proximity to a metal film supporting surface plasmon waves. When an acoustic wave is incident onto a receiving plate positioned within the penetration depth of the surface plasmons, it creates displacements of the surface of the plate and thus modulates the dielectric properties, affecting the SPR and the reflection of the incident light. Here we study characteristics and determine the optimal configuration of such an acousto-optical transducer with surface plasmons for efficient conversion of an acoustic signal into an optical one. We simulate the properties of this transducer and present estimates showing that it can have a large frequency bandwidth and high sensitivity.
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Mohammadzadeh-Asl S, Keshtkar A, Ezzati Nazhad Dolatabadi J, de la Guardia M. Nanomaterials and phase sensitive based signal enhancment in surface plasmon resonance. Biosens Bioelectron 2018; 110:118-131. [PMID: 29604520 DOI: 10.1016/j.bios.2018.03.051] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 03/13/2018] [Accepted: 03/22/2018] [Indexed: 01/19/2023]
Abstract
Measurement of small molecules in extremely dilute concentrations of analyte play an important role in different issues ranging from food industry to biological, pharmaceutical and therapeutical applications. Surface plasmon resonance (SPR) sensors can be a suitable choice for detection of small molecules based on interactions with biomolecules. However, sensitivity of the system for detection of these molecules is very low. Improving sensitivity has been a challenge for years. Therefore, different methods have been used to enhance SPR signals. The SPR signal enhancement using numerous nanomaterials has provided exciting results. Among various nanomaterials, metal nanoparticles (for instance gold, silver and magnetic nanoparticles), quantum dots, nanorads, and carbon-based nanostructures have got much attention due to ease in fabrication, appropriate size and shape. In addition to the advantages provided by using nanomaterials, signal enhancement provided by the appropriate use of phase information of the reflected light could be also important to improve SPR sensitivity. Phase-sensitive SPR sensors are able to detect infinitesimal changes in external properties of target while traditional type of SPR cannot demonstrate these changes. This article provides an overview on signal enhancment in SPR using nanomaterials and properties of light. We also discuss on recent progresses of the field, describing basic concepts concerning nanostructures as well as phase-sensitive sensors as platform for enhancement of signal in SPR.
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Affiliation(s)
- Saeideh Mohammadzadeh-Asl
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ahmad Keshtkar
- Department of Medical Physics, School of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Miguel de la Guardia
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
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Gatterdam V, Frutiger A, Stengele KP, Heindl D, Lübbers T, Vörös J, Fattinger C. Focal molography is a new method for the in situ analysis of molecular interactions in biological samples. NATURE NANOTECHNOLOGY 2017; 12:1089-1095. [PMID: 28945239 DOI: 10.1038/nnano.2017.168] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 07/11/2017] [Indexed: 05/09/2023]
Abstract
Focal molography is a next-generation biosensor that visualizes specific biomolecular interactions in real time. It transduces affinity modulation on the sensor surface into refractive index modulation caused by target molecules that are bound to a precisely assembled nanopattern of molecular recognition sites, termed the 'mologram'. The mologram is designed so that laser light is scattered at specifically bound molecules, generating a strong signal in the focus of the mologram via constructive interference, while scattering at nonspecifically bound molecules does not contribute to the effect. We present the realization of molograms on a chip by submicrometre near-field reactive immersion lithography on a light-sensitive monolithic graft copolymer layer. We demonstrate the selective and sensitive detection of biomolecules, which bind to the recognition sites of the mologram in various complex biological samples. This allows the label-free analysis of non-covalent interactions in complex biological samples, without a need for extensive sample preparation, and enables novel time- and cost-saving ways of performing and developing immunoassays for diagnostic tests.
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Affiliation(s)
- Volker Gatterdam
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Andreas Frutiger
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | | | | | - Thomas Lübbers
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, 4070 Basel, Switzerland
| | - Janos Vörös
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Christof Fattinger
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, 4070 Basel, Switzerland
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15
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16
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Patil SB, Vögtli M, Webb B, Mazza G, Pinzani M, Soh YA, McKendry RA, Ndieyira JW. Decoupling competing surface binding kinetics and reconfiguration of receptor footprint for ultrasensitive stress assays. NATURE NANOTECHNOLOGY 2015; 10:899-907. [PMID: 26280409 DOI: 10.1038/nnano.2015.174] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Accepted: 07/06/2015] [Indexed: 05/27/2023]
Abstract
Cantilever arrays have been used to monitor biochemical interactions and their associated stress. However, it is often necessary to passivate the underside of the cantilever to prevent unwanted ligand adsorption, and this process requires tedious optimization. Here, we show a way to immobilize membrane receptors on nanomechanical cantilevers so that they can function without passivating the underlying surface. Using equilibrium theory, we quantitatively describe the mechanical responses of vancomycin, human immunodeficiency virus type 1 antigens and coagulation factor VIII captured on the cantilever in the presence of competing stresses from the top and bottom cantilever surfaces. We show that the area per receptor molecule on the cantilever surface influences ligand-receptor binding and plays an important role on stress. Our results offer a new way to sense biomolecules and will aid in the creation of ultrasensitive biosensors.
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Affiliation(s)
- Samadhan B Patil
- London Centre for Nanotechnology and Departments of Medicine and Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
- Department of Materials, Imperial College London, London SW7 2AZ, UK
| | - Manuel Vögtli
- London Centre for Nanotechnology and Departments of Medicine and Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
| | - Benjamin Webb
- London Centre for Nanotechnology and Departments of Medicine and Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
- Division of Infection &Immunity, University College London, Cruciform Building, Gower Street, London WC1E 6BT, UK
| | - Giuseppe Mazza
- UCL Institute for Liver and Digestive Health, Royal Free Hospital, London NW3 2QG, UK
| | - Massimo Pinzani
- UCL Institute for Liver and Digestive Health, Royal Free Hospital, London NW3 2QG, UK
| | - Yeong-Ah Soh
- Department of Materials, Imperial College London, London SW7 2AZ, UK
| | - Rachel A McKendry
- London Centre for Nanotechnology and Departments of Medicine and Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
| | - Joseph W Ndieyira
- London Centre for Nanotechnology and Departments of Medicine and Physics, University College London, 17-19 Gordon Street, London WC1H 0AH, UK
- Department of Chemistry, Jomo Kenyatta University of Agriculture and Technology, PO Box 62000, Nairobi, Kenya
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Zhang P, Liu L, He Y, Shen Z, Guo J, Ji Y, Ma H. Non-scan and real-time multichannel angular surface plasmon resonance imaging method. APPLIED OPTICS 2014; 53:6037-6042. [PMID: 25321685 DOI: 10.1364/ao.53.006037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 08/04/2014] [Indexed: 06/04/2023]
Abstract
We describe a non-scan and real-time multichannel angular surface plasmon resonance (SPR) imaging method. We demonstrate experimentally, with multiple line shaped light illuminations to construct multi-imaging channels, that an image captured with an area detector can probe the surface plasmons with different field distributions. Thus, it provides a fixed optical-sensing module measuring the spatial variations of the refractive index in the flow system in real time without scanning. This technique has the advantages of high system stability and similar optical arrangement to the conventional parallel-channel SPR sensors and could have potential applications in multianalyte detection and reference-compensated biosensing.
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Use of synthetic single-stranded oligonucleotides as artificial test soiling for validation of surgical instrument cleaning processes. BIOMED RESEARCH INTERNATIONAL 2014; 2014:632127. [PMID: 24672793 PMCID: PMC3930025 DOI: 10.1155/2014/632127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 12/10/2013] [Indexed: 11/28/2022]
Abstract
Surgical instruments are often strongly contaminated with patients' blood and tissues, possibly containing pathogens. The reuse of contaminated instruments without adequate cleaning and sterilization can cause postoperative inflammation and the transmission of infectious diseases from one patient to another. Thus, based on the stringent sterility requirements, the development of highly efficient, validated cleaning processes is necessary. Here, we use for the first time synthetic single-stranded DNA (ssDNA_ODN), which does not appear in nature, as a test soiling to evaluate the cleaning efficiency of routine washing processes. Stainless steel test objects were coated with a certain amount of ssDNA_ODN. After cleaning, the amount of residual ssDNA_ODN on the test objects was determined using quantitative real-time PCR. The established method is highly specific and sensitive, with a detection limit of 20 fg, and enables the determination of the cleaning efficiency of medical cleaning processes under different conditions to obtain optimal settings for the effective cleaning and sterilization of instruments. The use of this highly sensitive method for the validation of cleaning processes can prevent, to a significant extent, the insufficient cleaning of surgical instruments and thus the transmission of pathogens to patients.
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Study of glycol chitosan-carboxymethyl β-cyclodextrins as anticancer drugs carrier. Carbohydr Polym 2013; 93:679-85. [DOI: 10.1016/j.carbpol.2012.12.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Revised: 12/03/2012] [Accepted: 12/07/2012] [Indexed: 11/24/2022]
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20
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Barchiesi D. Numerical retrieval of thin aluminium layer properties from SPR experimental data. OPTICS EXPRESS 2012; 20:9064-9078. [PMID: 22513618 DOI: 10.1364/oe.20.009064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The inverse problem for Surface Plasmon Resonance measurements [1] on a thin layer of aluminium in the Kretschmann configuration, is solved with a Particle Swarm Optimization method. The optical indexes as well as the geometrical parameters are found for the best fit of the experimental reflection coefficient in s and p polarization, for four samples, under three theoretical hypothesis on materials: the metal layer is pure, melted with its oxyde, or coated with oxyde. The influence of the thickness of the metal layer on its optical properties is then investigated.
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Affiliation(s)
- Dominique Barchiesi
- Project Group for Automatic Mesh Generation and Advanced Methods, Gamma3 Project (UTT-INRIA), University of Technology of Troyes, 12 rue Marie Curie-BP 2060, 10010 Troyes Cedex, France.
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21
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Gao Y, Gan Q, Xin Z, Cheng X, Bartoli FJ. Plasmonic Mach-Zehnder interferometer for ultrasensitive on-chip biosensing. ACS NANO 2011; 5:9836-44. [PMID: 22067195 DOI: 10.1021/nn2034204] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We experimentally demonstrate a plasmonic Mach-Zehnder interferometer (MZI) integrated with a microfluidic chip for ultrasensitive optical biosensing. The MZI is formed by patterning two parallel nanoslits in a thin metal film, and the sensor monitors the phase difference, induced by surface biomolecular adsorptions, between surface plasmon waves propagating on top and bottom surfaces of the metal film. The combination of a nanoplasmonic architecture and sensitive interferometric techniques in this compact sensing platform yields enhanced refractive index sensitivities greater than 3500 nm/RIU and record high sensing figures of merit exceeding 200 in the visible region, greatly surpassing those of previous plasmonic sensors and still hold potential for further improvement through optimization of the device structure. We demonstrate real-time, label-free, quantitative monitoring of streptavidin-biotin specific binding with high signal-to-noise ratio in this simple, ultrasensitive, and miniaturized plasmonic biosensor.
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Affiliation(s)
- Yongkang Gao
- Center for Optical Technologies, Electrical and Computer Engineering Department, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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22
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Mao Y, Bao Y, Wang W, Li Z, Li F, Niu L. Layer-by-layer assembled multilayer of graphene/Prussian blue toward simultaneous electrochemical and SPR detection of H2O2. Talanta 2011; 85:2106-12. [DOI: 10.1016/j.talanta.2011.07.056] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Revised: 07/11/2011] [Accepted: 07/12/2011] [Indexed: 11/29/2022]
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23
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Wang X, Jefferson M, Hobbs PCD, Risk WP, Feller BE, Miller RD, Knoesen A. Shot-noise limited detection for surface plasmon sensing. OPTICS EXPRESS 2011; 19:107-17. [PMID: 21263547 DOI: 10.1364/oe.19.000107] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
It is demonstrated that surface plasmon sensing can be performed in the shot-noise-limited regime to resolve index of refractive changes on the order of 10-10/√Hz at input powers of 1 mW. This improved resolution is achieved by using active electronic noise cancelling to suppress laser intensity noise and a wavelength that maximizes sensitivity to index of refraction changes occurring at an interface. The resolution of the system is experimentally demonstrated by measuring the refractive index change of air in response to pressure changes.
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Affiliation(s)
- Xi Wang
- Department of Electrical and Computer Engineering, University of California, Davis, Davis, CA 95616, USA
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24
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Luan Q, Zhou K, Tan H, Yang D, Yao X. Au-NPs enhanced SPR biosensor based on hairpin DNA without the effect of nonspecific adsorption. Biosens Bioelectron 2011; 26:2473-7. [DOI: 10.1016/j.bios.2010.10.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 10/22/2010] [Accepted: 10/22/2010] [Indexed: 10/18/2022]
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25
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Kessentini S, Barchiesi D, Grosges T, Giraud-Moreau L, Lamy de la Chapelle M. Adaptive Non-Uniform Particle Swarm Application to Plasmonic Design. INTERNATIONAL JOURNAL OF APPLIED METAHEURISTIC COMPUTING 2011. [DOI: 10.4018/jamc.2011010102] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The metaheuristic approach has become an important tool for the optimization of design in engineering. In that way, its application to the development of the plasmonic based biosensor is apparent. Plasmonics represents a rapidly expanding interdisciplinary field with numerous transducers for physical, biological and medicine applications. Specific problems are related to this domain. The plasmonic structures design depends on a large number of parameters. Second, the way of their fabrication is complex and industrial aspects are in their infancy. In this study, the authors propose a non-uniform adapted Particle Swarm Optimization (PSO) for rapid resolution of plasmonic problem. The method is tested and compared to the standard PSO, the meta-PSO (Veenhuis, 2006) and the ANUHEM (Barchiesi, 2009).These approaches are applied to the specific problem of the optimization of Surface Plasmon Resonance (SPR) Biosensors design. Results show great efficiency of the introduced method.
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26
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Xiao X, Gao Y, Xiang J, Zhou F. Laser-induced thermal effect in surface plasmon resonance. Anal Chim Acta 2010; 676:75-80. [DOI: 10.1016/j.aca.2010.07.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2010] [Revised: 07/19/2010] [Accepted: 07/22/2010] [Indexed: 10/19/2022]
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27
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Kim I, Kihm KD. Measuring near-field nanoparticle concentration profiles by correlating surface plasmon resonance reflectance with effective refractive index of nanofluids. OPTICS LETTERS 2010; 35:393-395. [PMID: 20125732 DOI: 10.1364/ol.35.000393] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Time-dependent and near-field nanoparticle concentrations are determined by correlating the surface plasmon resonance (SPR) reflectance intensities with the effective refractive index (ERI) of the nanofluid under evaporation. A critical angle measurement for total internal reflection identifies the ERI of the nanofluid at different nanoparticle concentrations. The corresponding SPR reflectance intensities correlate the nanofluidic ERI with the nanoparticle concentrations. Example applications for evaporating nanofluidic droplets containing 47 nmAl(2)O(3) particles demonstrate the feasibility of this new imaging tool for measuring time-resolved and full-field nanoparticle concentration profiles.
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Affiliation(s)
- Iltai Kim
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee,Knoxville, Tennessee 37996, USA
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28
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Luan Q, Xue Y, Yao X, Lu W. Hairpin DNA probe based surface plasmon resonance biosensor used for the activity assay of E. coli DNA ligase. Analyst 2009; 135:414-8. [PMID: 20098778 DOI: 10.1039/b920228e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Using hairpin DNA probe self-structure change during DNA ligation process, a sensitive, label-free and simple method of E. coli DNA ligase assay via a home-built high-resolution surface plasmon resonance (SPR) instrument was developed. The DNA ligation process was monitored in real-time and the effects of single-base mutation on the DNA ligation process were investigated. Then an assay of E. coli DNA ligase was completed with a lower detection limit (0.6 nM), wider concentration range and better reproducibility. Moreover, the influence of Quinacrine on the activity of E. coli DNA ligase was also studied, which demonstrated that our method was useful for drug screening.
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Affiliation(s)
- Qingfen Luan
- College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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29
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Xia N, Liu L, Yi X, Wang J. Studies of interaction of tumor suppressor p53 with apo-MT using surface plasmon resonance. Anal Bioanal Chem 2009; 395:2569-75. [DOI: 10.1007/s00216-009-3174-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 09/18/2009] [Accepted: 09/19/2009] [Indexed: 11/24/2022]
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30
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Barchiesi D. Adaptive non-uniform, hyper-elitist evolutionary method for the optimization of plasmonic biosensors. 2009 INTERNATIONAL CONFERENCE ON COMPUTERS & INDUSTRIAL ENGINEERING 2009. [PMID: 0 DOI: 10.1109/iccie.2009.5223795] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
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31
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Wang K, Zheng Z, Su Y, Wang Z, Song L, Zhu J. Hybrid differential interrogation method for sensitive surface plasmon resonance measurement enabled by electro-optically tunable SPR sensors. OPTICS EXPRESS 2009; 17:4468-4478. [PMID: 19293874 DOI: 10.1364/oe.17.004468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A novel detection method enabled by electro-optically tunable waveguide-coupled surface plasmon resonance sensors is demonstrated. Both the WCSPR response of sensor and the interrogation light are varied simultaneously in this hybrid scheme. Modulation and demodulation of the sensor's response are achieved by applying a high-frequency AC electrical signal and electrically filtering the detected signal. Scanning the incident angle at a lower speed yields an angular dependent response. Theoretical analyses and experimental results show that the angular-dependent signal is closely related to the derivative of the SPR reflectivity with a sharp, linear jump near the minimum of the SPR peak. Thus, simple linear-fitting and zero-finding algorithms can be used to locate the SPR angle, and sophisticated data processing algorithms and electronic hardware can be avoided.
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Affiliation(s)
- Kun Wang
- National Center for NanoScience and Technology, No.11 Beiyitiao, Zhongguancun, Beijing, 100190, China
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32
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Li YC, Chang YF, Su LC, Chou C. Differential-phase surface plasmon resonance biosensor. Anal Chem 2008; 80:5590-5. [PMID: 18507400 DOI: 10.1021/ac800598c] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, a novel differential-phase-sensitive surface plasmon resonance biosensor (DP-SPRB) is proposed and developed, in which a two-frequency laser is integrated with a differential amplifier in order to analytically convert the phase modulation into amplitude modulation. With the use of the conventional envelope detection technique, the differential phase is precisely decoded in real time in terms of the demodulated amplitude. In order to verify high detection sensitivity of the DP-SPRB, a sucrose-water solution and glycerin-water solution at low concentrations were both tested, and the experimental results confirm that the detection sensitivity on wt % concentration of the sucrose solution is 0.00001%. Moreover, the real-time monitoring mouse IgG/antimouse IgG interaction shows the minimum concentration of mouse IgG to be at 10 fg/mL. To our knowledge, this is the highest sensitivity ever measured by a surface plasmon resonance biosensor. However, because of the limited dynamic range of DP-SPRB, it can only apply to biomolecule interactions at extremely low concentration.
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Affiliation(s)
- Ying-Chang Li
- Department of Optics and Photonics, National Central University, Jhongli, Taiwan, 320
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33
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Wain AJ, Do HNL, Mandal HS, Kraatz HB, Zhou F. The Influence of Molecular Dipole Moment on the Redox-Induced Reorganization of α-Helical Peptide Self-Assembled Monolayers: An Electrochemical SPR Investigation. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2008; 112:14519. [PMID: 18949053 PMCID: PMC2570745 DOI: 10.1021/jp804643c] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Self-assembled monolayers (SAMs) of ferrocene-labeled α-helical peptides were prepared on gold surfaces and studied using electrochemical surface plasmon resonance (EC-SPR). The leucine-rich peptides were synthesized with a cysteine sulfhydryl group either at the C- or N-terminus, enabling their immobilization onto gold surfaces with control of the direction of the molecular dipole moment. Two electroactive SAMs were studied, one in which all of the peptide dipole moments are oriented in the same direction (SAM1), and the other in which the peptide dipole moment of one peptide is aligned in the opposite direction to that of its surrounding peptide molecules (SAM2). Cyclic voltammetry combined with SPR measurements revealed that SAM reorientations concomitant with the oxidation of the ferrocene label were more significant in SAM2 than in SAM1. The substantially greater change in the peptide film thickness in the case of SAM2 is attributed to the electrostatic repulsion between the electrogenerated ferrocinium moiety and the positively charged gold surface. The greater permeability of SAM1 to electrolyte anions, on the other hand, appears to effectively neutralize this electrostatic repulsion. The film thickness change in SAM2 was estimated to be 0.25 ± 0.05 nm using numerical simulation. The timescale of the redox-induced SPR changes was established by chronoamperometry and time-resolved SPR measurements, followed by fitting of the SPR response to a stretched exponential function. The time constants measured for the anodic process were 16 and 6 ms for SAM1 and SAM2 respectively, indicating that the SAM thickness changes are notably fast.
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Affiliation(s)
- Andrew J. Wain
- Department of Chemistry and Biochemistry, California State University Los Angeles, Los Angeles, California 90032
| | - Huy N. L. Do
- Department of Chemistry and Biochemistry, California State University Los Angeles, Los Angeles, California 90032
| | - Himadri S. Mandal
- Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada
| | | | - Feimeng Zhou
- Department of Chemistry and Biochemistry, California State University Los Angeles, Los Angeles, California 90032
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34
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Gronewold TM. Surface acoustic wave sensors in the bioanalytical field: Recent trends and challenges. Anal Chim Acta 2007; 603:119-28. [DOI: 10.1016/j.aca.2007.09.056] [Citation(s) in RCA: 141] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Revised: 09/14/2007] [Accepted: 09/24/2007] [Indexed: 10/22/2022]
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35
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Hoa XD, Kirk AG, Tabrizian M. Towards integrated and sensitive surface plasmon resonance biosensors: A review of recent progress. Biosens Bioelectron 2007; 23:151-60. [PMID: 17716889 DOI: 10.1016/j.bios.2007.07.001] [Citation(s) in RCA: 458] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2007] [Revised: 06/07/2007] [Accepted: 07/12/2007] [Indexed: 12/11/2022]
Abstract
The use of surface plasmon resonance (SPR) biosensors is increasingly popular in fundamental biological studies, health science research, drug discovery, clinical diagnosis, and environmental and agricultural monitoring. SPR allows for the qualitative and quantitative measurements of biomolecular interactions in real-time without requiring a labeling procedure. Today, the development of SPR is geared toward the design of compact, low-cost, and sensitive biosensors. Rapid advances in micro-fabrication technology have made available integratable opto-electronic components suitable for SPR. This review paper focuses on the progress made over the past 4 years toward this integration. Readers will find the descriptions of novel SPR optical approaches and materials. Nano-technology is also increasingly used in the design of biologically optimized and optically enhanced surfaces for SPR. Much of this work is leading to the integration of sensitive SPR to lab-on-a-chip platforms.
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Affiliation(s)
- X D Hoa
- Department of Biomedical Engineering, McGill University, 3775 University Street Montréal, Que. H3A 2A4, Canada
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36
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Kim IT, Kihm KD. Real-time and full-field detection of near-wall salinity using surface plasmon resonance reflectance. Anal Chem 2007; 79:5418-23. [PMID: 17566981 DOI: 10.1021/ac070301s] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An idea of real-time and full-field detection of near-wall salinity is presented to use the surface plasmon resonance (SPR) reflectance that changes with refractive index variations of the tested saline fluid. The laboratory-designed SPR system, based on the Kretschmann's configuration, uses a 47.5 nm thick gold layer as the SPR resonator, coated on a BK7 prism (n=1.515), and requires a one-time system calibration to establish a correlation of the specified saline mass concentration levels to the corresponding CCD (charge-coupled device) pixel gray levels. As a gravity-falling saline drop in water reaches the bottom and diffuses thereafter, the SPR system quantitatively maps the evolution of the salinity distributions in the near-wall region (less than 1 microm). An elaborate uncertainty analysis shows that the overall measurement uncertainties critically depend on the uniformity of the metal film thickness and the accuracy of its dielectric constant.
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Affiliation(s)
- Il Tai Kim
- Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996-2210, USA
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Alleyne CJ, Kirk AG, McPhedran RC, Nicorovici NAP, Maystre D. Enhanced SPR sensitivity using periodic metallic structures. OPTICS EXPRESS 2007; 15:8163-8169. [PMID: 19547143 DOI: 10.1364/oe.15.008163] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A sinusoidal silver grating is used to create a six-fold enhancement of the SPR response compared to a flat surface. The grating parameters are chosen to create a surface plasmon bandgap and it is shown that the enhancement of the sensitivity to bulk sample index occurs when operating near the bandgap. The Kretschmann configuration is considered and the Boundary Element Method is used to generate the dispersion curves.
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38
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Zhang Y, Xu M, Du M, Zhou F. Comparative studies of the interaction between ferulic acid and bovine serum albumin by ACE and surface plasmon resonance. Electrophoresis 2007; 28:1839-45. [PMID: 17465424 DOI: 10.1002/elps.200700025] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Affinity capillary electrophoresis (ACE) was used to study the interaction between ferulic acid (FA) and BSA. The interaction between FA and BSA was facilitated by injecting FA into a BSA-containing running buffer. Both mobility ratio and mobility shift assays were performed to deduce the binding constant (K(b)). However, the K(b )value obtained with the mobility ratio assay was only approximately 20% of that extracted from the mobility shift assay. The former assay yielded a K(b) value (5.6 +/- 0.4 x 10(4) M(-1)), which compares well with the result obtained with surface plasmon resonance (SPR) (5.1 +/- 0.6 x 10(4) M(-1)). The discrepancy between the mobility ratio and mobility shift assays suggests that the data extrapolation from the mobility ratio should be more reliable for cases when both changes in the EOF and viscosity of the running buffer are important. The work demonstrates that ACE, a solution-based technique, and SPR, a technique addressing interfacial processes, are highly complementary to each other and the comparative studies are confirmatory and allow binding constants to be accurately determined.
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Affiliation(s)
- Yintang Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, P. R. China
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39
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Abstract
Surface-plasmon resonance (SPR) is a sensing technique widely used for its label-free feature. However, its sensitivity is contingent on the divergence angle of the excitation beam. The problem becomes pronounced for compact systems when a low-cost LED is used as the light source. When the Kretschmann configuration with a periodically modulated surface is used, a bandgap appears in the surface plasmon dispersion relation. We recognize that the high density of modes on the edge of the surface-plasmon bandgap permits the coupling of a wider range of incidence angles of excitation photons to surface-plasmon polaritons than what is possible in the traditional Kretschmann configuration. Here, the numerical simulation illustrates that the sensitivity, detection limit, and reflectivity minimum of an amplitude-based SPR bandgap-assisted surface-plasmon sensor are almost independent of the divergence angle. Two different bandgap structures are compared with the Kretschmann configuration using the rigorous coupled-wave analysis technique. The results indicate that the bandgap-assisted sensing outperforms traditional SPR sensing when the angular standard deviation of the excitation beam is above 1 degree.
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Affiliation(s)
- Arnaud J Benahmed
- Department of Mechanical Engineering, University of California, Los Angeles, CA 90095, USA.
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40
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Zhang Y, Xu M, Wang Y, Toledo F, Zhou F. Studies of metal ion binding by apo-metallothioneins attached onto preformed self-assembled monolayers using a highly sensitive surface plasmon resonance spectrometer. SENSORS AND ACTUATORS. B, CHEMICAL 2007; 123:784-792. [PMID: 18493298 PMCID: PMC2083571 DOI: 10.1016/j.snb.2006.10.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The use of a flow-injection surface plasmon resonance (FI-SPR) spectrometer equipped with a bicell detector or a position-sensitive device for determining coordination of heavy metal ions (Cd(2+) and Hg(2+)) by surface-confined apo-metallothionein (apo-MT) molecules is described. To facilitate the formation of a compact MT adsorbate layer with a uniform surface orientation, MT molecules were attached onto a preformed alkanethiol self-assembled monolayer. The method resorts to the generation of apo-MT at the surface by treating the MT-covered sensor chip with glycine-HCl and the measurement of the apo-MT conformation changes upon metal ion incorporation. Domain-specific metal ion binding processes by the apo-MT molecules were observed. Competitive replacement of one metal ion by another can be monitored in real time by FI-SPR. The tandem use of an immobilization scheme for forming a sub-monolayer of MT molecules at the sensor surface and the highly sensitive FI-SPR instrument affords a low concentration detection level. The detection level for Cd(2+) (0.1 μM or 15 ppb) compares favorably with similar studies and the methodology complements to other well-established sensitive analytical techniques. The extent of metal incorporation by apo-MT molecules was also determined.
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Affiliation(s)
- Yintang Zhang
- College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, P. R. China
| | - Maotian Xu
- College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, P. R. China
| | - Yanju Wang
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, CA 90032, USA
| | - Freddy Toledo
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, CA 90032, USA
| | - Feimeng Zhou
- College of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, P. R. China
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, CA 90032, USA
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41
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Iwata T, Maeda S. Simulation of an absorption-based surface-plasmon resonance sensor by means of ellipsometry. APPLIED OPTICS 2007; 46:1575-82. [PMID: 17334451 DOI: 10.1364/ao.46.001575] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Through numerical simulations, we point out that introduction of an ellipsometric measurement technique to an absorption-based surface-plasmon resonance (SPR) sensor enhances precision and sensitivity in measuring the imaginary part k of the complex refractive index of the sample. By measuring a pair of ellipsometric Delta-Psi parameters, instead of the conventional energy reflectance R(p) of p-polarized light in the Kretschmann optical arrangement, we can detect a small change of k that is proportional to that of the concentration of the sample, especially when k << 1. While one has difficulty in determining the value of k uniquely by the standard technique, when the thickness of Au under the prism is thin (20-30 nm), the ellipsometric technique (ET) overcomes the problem. Furthermore, the value of k and the thickness d(s) of the absorptive sample that is adsorbed on Au can be determined precisely. The ET based on the common-path polarization interferometer is robust against external disturbance such as mechanical vibration and intensity fluctuation of a light source. Although only the p-polarized light is responsible for the SPR phenomenon, we show that the introduction of the ET is significant for quantitative analysis.
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Affiliation(s)
- Tetsuo Iwata
- Division of Energy Systems, Institute of Technology and Science, University of Tokushima, 2-1 Minami-Jyosanjima, Tokushima 770-8506, Japan.
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42
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Stewart ME, Mack NH, Malyarchuk V, Soares JANT, Lee TW, Gray SK, Nuzzo RG, Rogers JA. Quantitative multispectral biosensing and 1D imaging using quasi-3D plasmonic crystals. Proc Natl Acad Sci U S A 2006; 103:17143-8. [PMID: 17085594 PMCID: PMC1634412 DOI: 10.1073/pnas.0606216103] [Citation(s) in RCA: 294] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Indexed: 11/18/2022] Open
Abstract
We developed a class of quasi-3D plasmonic crystal that consists of multilayered, regular arrays of subwavelength metal nanostructures. The complex, highly sensitive structure of the optical transmission spectra of these crystals makes them especially well suited for sensing applications. Coupled with quantitative electrodynamics modeling of their optical response, they enable full multiwavelength spectroscopic detection of molecular binding events with sensitivities that correspond to small fractions of a monolayer. The high degree of spatial uniformity of the crystals, formed by a soft nanoimprint technique, provides the ability to image binding events over large areas with micrometer spatial resolution. These features, together with compact form factors, low-cost fabrication procedures, simple readout apparatus, and ability for direct integration into microfluidic networks and arrays, suggest promise for these devices in label-free bioanalytical detection systems.
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Affiliation(s)
- Matthew E. Stewart
- Departments of *Chemistry and
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
| | - Nathan H. Mack
- Departments of *Chemistry and
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
| | - Viktor Malyarchuk
- Materials Science and Engineering
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
| | - Julio A. N. T. Soares
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
| | - Tae-Woo Lee
- Chemistry Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439
| | - Stephen K. Gray
- Chemistry Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439
| | - Ralph G. Nuzzo
- Departments of *Chemistry and
- Materials Science and Engineering
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
| | - John A. Rogers
- Departments of *Chemistry and
- Materials Science and Engineering
- Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana–Champaign, Urbana, IL 61801; and
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43
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Chou C, Teng HK, Tsai CC, Yu LP. Balanced detector interferometric ellipsometer. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2006; 23:2871-9. [PMID: 17047715 DOI: 10.1364/josaa.23.002871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A novel balanced detector interferometric ellipsometer (BDIE), composed of a polarized common-path optical heterodyne interferometer incorporating a novel balanced detector, provides an amplitude-sensitive method for measurement of the elliptical parameters of a thin film. The requirement for equal amplitude of the polarized heterodyne signals for balanced detection results in the simultaneous measurement of the elliptical parameters in terms of the azimuth angle of a half-wave plate and the output intensity from the differential amplifier, respectively. The common-path feature of BDIE shows a common phase noise rejection mode and this enhances the sensitivity of the phase measurement. At the same time, the balanced detector configuration of BDIE reduces excess noise of laser intensity fluctuation to give better sensitivity during measurement. The error of measurement of BDIE is derived and analyzed. Finally, the elliptical polarization effect of the laser beam is found to be independent of the measurement of the elliptical parameters.
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Affiliation(s)
- Chien Chou
- Institute of Radiological Science and Institute of Biophototnics, National Yang-Ming University, Taipei, Taiwan 112.
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44
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Yao X, Li X, Toledo F, Zurita-Lopez C, Gutova M, Momand J, Zhou F. Sub-attomole oligonucleotide and p53 cDNA determinations via a high-resolution surface plasmon resonance combined with oligonucleotide-capped gold nanoparticle signal amplification. Anal Biochem 2006; 354:220-8. [PMID: 16762306 DOI: 10.1016/j.ab.2006.04.011] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2006] [Revised: 03/29/2006] [Accepted: 04/07/2006] [Indexed: 11/30/2022]
Abstract
Oligonucleotide (ODN)-capped gold nanoparticles (Au-NPs) were used in a sandwich assay of ODN or polynucleotide by a flow injection surface plasmon resonance (SPR). A carboxylated dextran film was immobilized onto the SPR sensor surface to eliminate nonspecific adsorption of ODN-capped Au-NPs. The tandem use of signal amplification via the adlayer of the ODN-capped Au-NPs and the differential signal detection by the bicell detector on the SPR resulted in a remarkable DNA detection level. A 39-mer target at a quantity as low as 2.1 x 10(-20)mol, corresponding to 1.38 fM in a 15 microl solution, can be measured. To our knowledge, both the concentration and quantity detection levels are the lowest among all the gene analyses conducted with SPR to this point. The method is shown to be reproducible (relative standard deviation values <16%) and to possess high sequence specificity. It is also demonstrated to be viable for sequence-specific p53 cDNA analysis. The successful elimination of nonspecific adsorption of, and the signal amplification by, ODN-capped Au-NPs renders the SPR attractive for cases where the DNA concentration is extremely low and the sample availability is severely limited.
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Affiliation(s)
- Xin Yao
- College of Chemistry and Chemical Engineering, Graduate School, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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45
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Sepúlveda B, Calle A, Lechuga LM, Armelles G. Highly sensitive detection of biomolecules with the magneto-optic surface-plasmon-resonance sensor. OPTICS LETTERS 2006; 31:1085-7. [PMID: 16625911 DOI: 10.1364/ol.31.001085] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The characteristics of a novel magneto-optic surface-plasmon-resonance (MOSPR) sensor and its use for the detection of biomolecules are presented. This physical transduction principle is based on the combination of the magneto-optic activity of magnetic materials and a surface-plasmon resonance of metallic layers. Such a combination can produce a sharp enhancement of the magneto-optic effects that strongly depends on the optical properties of the surrounding medium, allowing its use for biosensing applications. Experimental characterizations of the MOSPR sensor have shown an increase in the limit of detection by a factor of 3 in changes of refractive index and in the adsorption of biomolecules compared with standard sensors. Optimization of the metallic layers and the experimental setup could result in an improvement of the limit of detection by as much as 1 order of magnitude.
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Affiliation(s)
- B Sepúlveda
- Instituto de Microelectrónica de Madrid (Centro Nacional de Microelectrónica-Consejo Superior de Investigaciones Cientificas), Isaac Newton 8, 28760 Tres Cantos, Madrid, Spain.
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46
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Xiang J, Guo J, Zhou F. Scanning Electrochemical Microscopy Combined with Surface Plasmon Resonance: Studies of Localized Film Thickness Variations and Molecular Conformation Changes. Anal Chem 2006; 78:1418-24. [PMID: 16503589 DOI: 10.1021/ac051601h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The combination of scanning electrochemical microscopy (SECM) with surface plasmon resonance (SPR) is described. By oxidizing ferrocenylalkanethiol self-assembled monolayer (SAM) with SECM-generated Ce4+, the coupled technique, SECM-SPR, is shown to be viable for determining local variations in thin film thickness. Factors (tip/substrate distance, tip potential scan rate, and solution composition change) affecting the SECM-SPR response and operation are also discussed. The approach was further extended to the determination of conformational changes of cytochrome c molecules attached electrostatically onto a negatively charged SAM during its reduction by the tip-generated methyl viologen monocation. The high sensitivity of the SPR equipped with a bicell detector facilitates the measurement of infinitesimal film thickness changes accompanying redox reactions, while the SECM provides a means to obviate the necessity of applying a potential to the SPR substrate, which tends to cause unwanted interferences and complications. The approach also affords an avenue for determining film thickness variations that are not subject to certain effects, such as the surface charge, the heterogeneity of the substrate, and the distance between the redox center of the immobilized molecule and the underlying substrate electrode.
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Affiliation(s)
- Juan Xiang
- Institute of Surface Analysis and Biosensing, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China
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47
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Lipscomb IP, Sihota AK, Botham M, Harris KL, Keevil CW. Rapid method for the sensitive detection of protein contamination on surgical instruments. J Hosp Infect 2006; 62:141-8. [PMID: 16290315 DOI: 10.1016/j.jhin.2005.07.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2005] [Accepted: 07/05/2005] [Indexed: 11/16/2022]
Abstract
Hospital sterile service departments (SSDs) currently rely on simple visual confirmation of cleanliness as an assessment of the efficacy of cleaning surgical instruments. The inherent inability to monitor low levels of infectious or proteinaceous contamination on surgical instruments creates the possibility that highly dangerous and robust biological agents may remain infectious and undetected even after standard cleaning and sterilization procedures have been employed. This paper describes the development of a novel microscopy technique, episcopic differential interference contrast microscope, combined with the fluorescent reagent, SYPRO Ruby, to rapidly detect brain tissue protein to below 400 pg/mm(2) on an instrument surface. This technique has displayed a minimum level of detection observed by 50% of volunteers of 85 pg/mm(2) (95% confidence intervals 67-112 pg/mm(2)). Quantitative assessment of instruments supplied from various SSDs enabled the establishment of a 'contamination index' of both proteinaceous and non-proteinaceous deposits on the surface. This new methodology for the assessment of surface contamination is generally applicable and should facilitate future quantitative surveys of instrument contamination in hospitals and other healthcare environments.
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Affiliation(s)
- I P Lipscomb
- Environmental Healthcare Unit, School of Biological Sciences, University of Southampton, Southampton, UK.
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48
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Yan C, Matsuda W, Pepperberg DR, Zimmerman SC, Leckband DE. Synthesis and characterization of an electroactive surface that releases gamma-aminobutyric acid (GABA). J Colloid Interface Sci 2005; 296:165-77. [PMID: 16168426 DOI: 10.1016/j.jcis.2005.08.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2005] [Revised: 08/15/2005] [Accepted: 08/16/2005] [Indexed: 11/25/2022]
Abstract
We report the synthesis and characterization of a new electroactive surface capable of releasing the neurotransmitter gamma-aminobutyric acid (GABA) upon reduction. The GABA was anchored to an alkanethiol via electrochemically active quinone (abbreviation, TM-GABA). The quinone unit, upon reduction to the hydroquinone, cyclizes to release GABA into solution. The half-life is 99 s. The self-assembled monolayer (SAM) of TM-GABA on gold was prepared and characterized with several surface sensitive techniques. X-ray photoelectron spectroscopy (XPS) explored the SAM formation of TM-GABA on Au surfaces. Cyclic voltammograms showed the ability to electrochemically control the quinone unit at the distal end of the chain. GABA was selectively released upon electrochemical reduction at a potential of -700 mV. The functional GABA terminal group was detected by surface plasmon resonance measurements of anti-GABA antibody binding.
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Affiliation(s)
- Chun Yan
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL 61801, USA.
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49
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Kim D. Effect of the azimuthal orientation on the performance of grating-coupled surface-plasmon resonance biosensors. APPLIED OPTICS 2005; 44:3218-23. [PMID: 15943255 DOI: 10.1364/ao.44.003218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The effect of azimuthal orientation on the electromagnetic coupling of surface plasmons with the incident and diffracted light of a grating-coupled surface-plasmon resonance (GC-SPR) biosensor is investigated, and its practical implications are explored. For this purpose a GC-SPR biosensor model is considered, and well-established rigorous coupled-wave analysis is used. Numerical results indicate significant variations in surface-plasmon resonance characteristics in connection with the interaction between surface-plasmon polaritons associated with multiple-order diffraction. The results are discussed as they relate to applications that require minimal rotation sensitivity.
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Affiliation(s)
- Donghyun Kim
- School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, South Korea.
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50
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Chien FC, Chen SJ. A sensitivity comparison of optical biosensors based on four different surface plasmon resonance modes. Biosens Bioelectron 2005; 20:633-42. [PMID: 15494249 DOI: 10.1016/j.bios.2004.03.014] [Citation(s) in RCA: 162] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2004] [Revised: 03/05/2004] [Accepted: 03/11/2004] [Indexed: 11/23/2022]
Abstract
Current surface plasmon resonance (SPR) modes based on the attenuated total reflection (ATR) method can broadly be categorized as: conventional SPR, long-range SPR (LRSPR), coupled plasmon-waveguide resonance (CPWR), and waveguide-coupled SPR (WCSPR). Although the features of optical biosensors are dependent upon their particular SPR mode, a common requirement for all biosensors utilized for biomolecular interaction analysis (BIA) is a high degree of sensitivity. The current paper presents a theoretical analysis and comparison of the sensitivity and resolution of these four types of SPR biosensors when employed in three of the most prevalent detection methods, namely angular interrogation, wavelength interrogation, and intensity measurement. This study develops a detailed understanding of the influences of various biosensor design parameters in order to enhance the sensitivity and detection limit capabilities of such devices.
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Affiliation(s)
- F-C Chien
- Institute of Optical Sciences, National Central University, Chung-Li 320, Taiwan
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