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Ashizawa N, Takazono T, Ota K, Ito Y, Hirayama T, Takeda K, Ide S, Iwanaga N, Fujita A, Tashiro M, Hosogaya N, Akamatsu N, Kosai K, Tanaka T, Kobayashi H, Yamauchi R, Segawa C, Koizumi H, Taka N, Hishigaki H, Yamamoto K, Izumikawa K, Yanagihara K, Mukae H. Pre-clinical and clinical evaluation of a surface plasmon field-enhanced fluorescence spectroscopy (SPFS) antigen test for detecting SARS-CoV-2. J Infect Chemother 2024:S1341-321X(24)00236-8. [PMID: 39197666 DOI: 10.1016/j.jiac.2024.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Revised: 07/17/2024] [Accepted: 08/26/2024] [Indexed: 09/01/2024]
Abstract
INTRODUCTION The diagnostic tools of nucleic acid amplification tests and antigen tests have been extensively employed for the detection of Coronavirus disease 2019 (COVID-19). Although the reverse-transcriptase polymerase chain reaction (RT)-PCR test has high sensitivity and specificity, it is a time-consuming and labor-intensive process. On the other hand, antigen tests are simple and prompt, however, their low sensitivity and potential for false positives have been identified as limitations. In light of these factors, the development of novel tests that combine speed and clinical dependability is a promising prospect. METHODS Surface plasmon field-enhanced fluorescence spectroscopy (SPFS) excites chromophores by means of an enhanced electromagnetic field induced on a gold film surface. It enables the highly sensitive measurement of biomarkers in a short and simple 20-min window. In this study, a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) SPFS-based antigen test targeting the SARS-CoV-2 nucleocapsid protein was performed and evaluated in 25 patients with COVID-19 and 10 non-infected controls. RESULTS A positive correlation was observed between antigen levels determined by SPFS and RNA levels determined via RT-PCR. The sensitivity values were 100 %, 92 %, and 62.5 %; and the specificity values were 100 %, 90 %, and 100 %; for nasopharyngeal swabs, nasal swabs, and saliva specimens when the cutoff values were set to 65.1, 0.2, and 1.5 pg/mL, respectively. No clinically problematic cross-reactivity with analogous coronaviruses was observed. CONCLUSIONS The SARS-CoV-2 SPFS antigen test showed excellent clinical diagnostic accuracy for nasopharyngeal and nasal swabs, with a rapid turnaround.
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Affiliation(s)
- Nobuyuki Ashizawa
- Infection Control and Education Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852- 8501, Japan; Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Takahiro Takazono
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan; Department of Infectious Diseases, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan.
| | - Kenji Ota
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Yuya Ito
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Tatsuro Hirayama
- Department of Pharmacotherapeutics, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Kazuaki Takeda
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Shotaro Ide
- Infectious Diseases Experts Training Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Naoki Iwanaga
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Ayumi Fujita
- Infection Control and Education Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852- 8501, Japan
| | - Masato Tashiro
- Infection Control and Education Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852- 8501, Japan; Department of Infectious Diseases, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Naoki Hosogaya
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan; Clinical Research Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Norihiko Akamatsu
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Kosuke Kosai
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Takeshi Tanaka
- Infection Control and Education Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852- 8501, Japan
| | - Hironori Kobayashi
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Ryosuke Yamauchi
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Chie Segawa
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Hikaru Koizumi
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Natsumi Taka
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Haretsugu Hishigaki
- Diagnostic Division, Otsuka Pharmaceutical Co., Ltd., 224-18 Hiraishi Ebisuno, Kawauchi-cho, Tokushima, Tokushima, 771-0182, Japan
| | - Kazuko Yamamoto
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan; Division of Infectious, Respiratory, and Digestive Medicine, University of the Ryukyus Graduate School of Medicine, 207 Uehara, Nishihara, Okinawa, 903-0215, Japan
| | - Koichi Izumikawa
- Infection Control and Education Center, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852- 8501, Japan; Department of Infectious Diseases, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Katsunori Yanagihara
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
| | - Hiroshi Mukae
- Department of Respiratory Medicine, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki, Nagasaki, 852-8501, Japan
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Weiler K, Kleber K, Zielinsky S, Moritz A, Bauer N. Analytical performance and method comparison of a quantitative point-of-care immunoassay for measurement of bile acids in cats and dogs. J Vet Diagn Invest 2021; 33:35-46. [PMID: 33112211 PMCID: PMC7756073 DOI: 10.1177/1040638720968784] [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] [Indexed: 11/15/2022] Open
Abstract
Point-of-care analyzers (POCAs) for quantitative assessment of bile acids (BAs) are scarce in veterinary medicine. We evaluated the Fuji Dri-Chem Immuno AU10V analyzer and v-BA test kit (Fujifilm) for detection of feline and canine total serum BA concentration. Results were compared with a 5th-generation assay as reference method and a 3rd-generation assay, both run on a bench-top analyzer. Analytical performance was assessed at 3 different concentration ranges, and with interferences. For method comparison, samples of 60 healthy and diseased cats and 64 dogs were included. Linearity was demonstrated for a BA concentration up to 130 µmol/L in cats (r = 0.99) and 110 µmol/L in dogs (r = 0.99). The analyzer showed high precision near the lower limit of quantification of 2 µmol/L reported by the manufacturer. Intra- and inter-assay coefficients of variation were < 5% for both species and all concentrations. Interferences were observed for bilirubin (800 mg/L) and lipid (4 g/L). There was excellent correlation with the reference method for feline (rs = 0.98) and canine samples (rs = 0.97), with proportional biases of 6.7% and -1.3%, respectively. However, a large bias (44.1%) was noted when the POCA was compared to the 3rd-generation assay. Total observed error was less than total allowable error at the 3 concentrations. The POCA reliably detected feline and canine BA in clinically relevant concentrations.
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Affiliation(s)
- Kristina Weiler
- Department of Veterinary Clinical Sciences, Clinical Pathology and Clinical Pathophysiology, Justus-Liebig-University, Giessen, Germany
| | - Katharina Kleber
- Department of Veterinary Clinical Sciences, Clinical Pathology and Clinical Pathophysiology, Justus-Liebig-University, Giessen, Germany
| | - Sabine Zielinsky
- Department of Veterinary Clinical Sciences, Clinical Pathology and Clinical Pathophysiology, Justus-Liebig-University, Giessen, Germany
| | - Andreas Moritz
- Department of Veterinary Clinical Sciences, Clinical Pathology and Clinical Pathophysiology, Justus-Liebig-University, Giessen, Germany
| | - Natali Bauer
- Department of Veterinary Clinical Sciences, Clinical Pathology and Clinical Pathophysiology, Justus-Liebig-University, Giessen, Germany
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Chida H, Tawa K. Microscopic Study on Excitation and Emission Enhancement by the Plasmon Mode on a Plasmonic Chip. SENSORS 2020; 20:s20226415. [PMID: 33182635 PMCID: PMC7697065 DOI: 10.3390/s20226415] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 02/06/2023]
Abstract
Excitation and emission enhancement by using the plasmon mode formed on a plasmonic chip was studied with a microscope and micro-spectroscope. Surface plasmon resonance wavelengths were observed on one-dimensional (1D) and two-dimensional (2D) plasmonic chips by measuring reflection and transmission spectra, and they were assigned to the plasmon modes predicted by the theoretical resonance wavelengths. The excitation and emission enhancements were evaluated using the fluorescence intensity of yellow–green fluorescence particles. The 2D grating had plasmon modes of kgx45(2) (diagonal direction with m = 2) in addition to the fundamental mode of kgx(1) (direction of a square one side) in the visible range. In epifluorescence detection, the excitation enhancement factors of kgx(2) on the 1D and 2D chips were found to be 1.3–1.4, and the emission enhancement factor of kgx45(2) on the 2D chip was 1.5–1.8, although the emission enhancement was not found on the 1D chip. Moreover, enhancement factors for the other fluorophores were also studied. The emission enhancement factor of kgx(1) was shown to depend on the fluorescence quantum yield. The emission enhancement of 2D was 1.3-fold larger than that of 1D considering all azimuth components, and the 2D pattern was shown to be advantageous for bright fluorescence microscopic observation.
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Kaya T, Nagatoishi S, Nagae K, Nakamura Y, Tsumoto K. Highly sensitive biomolecular interaction detection method using optical bound/free separation with grating-coupled surface plasmon field-enhanced fluorescence spectroscopy (GC-SPFS). PLoS One 2019; 14:e0220578. [PMID: 31369601 PMCID: PMC6675060 DOI: 10.1371/journal.pone.0220578] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 07/18/2019] [Indexed: 01/06/2023] Open
Abstract
Grating-coupled surface plasmon field-enhanced fluorescence spectroscopy (GC-SPFS) with optical bound/free (B/F) separation technique was developed by employing a highly directional fluorescence with polarization of surface plasmon-coupled emission (SPCE) to realize highly sensitive immunoassay regardless of the ligand affinity. A highly sensitive immunoassay system with GC-SPFS was constructed using a plastic sensor chip reproducibly fabricated in-house by nanoimprinting and applied to the quantitative detection of an anti-lysozyme single-domain antibody (sdAb), to compare conventional washing B/F separation with optical B/F separation. Differences in the affinity of the anti-lysozyme sdAb, induced by artificial mutation of only one amino acid residue in the variable domain were attributed to higher sensitivity than that of the conventional Biacore surface plasmon resonance (SPR) system. The detection limit (LOD; means of six replicates of the zero standard plus three standard deviations) of the GC-SPFS immunoassay with optical B/F separation, was estimated to be 1.2 ng/ml with the low-affinity ligand (mutant sdAb Y52A: KD level was of the order of 10−7 ~ 10−6 M) and was clearly improved as compared to that (LOD: 9.4 ng/ml) obtained with the conventional washing B/F separation. These results indicate that GC-SPFS with the optical B/F separation technique offers opportunities to re-evaluate low-affinity biomaterials that are neither fully utilized nor widespread, and could facilitate the creation of novel and innovative methods in drug and diagnostic development.
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Affiliation(s)
- Takatoshi Kaya
- Corporate R&D Headquarters, Konica Minolta, Inc., Hino-shi, Tokyo, Japan
- * E-mail: (TK); (KT)
| | - Satoru Nagatoishi
- Institute of Medical Science, the University of Tokyo, Tokyo, Japan
- Department of Bioengineering, School of Engineering, the University of Tokyo, Hongo Bunkyo-ku, Tokyo, Japan
| | - Kosuke Nagae
- Corporate R&D Headquarters, Konica Minolta, Inc., Hino-shi, Tokyo, Japan
| | - Yukito Nakamura
- Corporate R&D Headquarters, Konica Minolta, Inc., Hino-shi, Tokyo, Japan
| | - Kohei Tsumoto
- Institute of Medical Science, the University of Tokyo, Tokyo, Japan
- Department of Bioengineering, School of Engineering, the University of Tokyo, Hongo Bunkyo-ku, Tokyo, Japan
- * E-mail: (TK); (KT)
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Lara S, Perez-Potti A. Applications of Nanomaterials for Immunosensing. BIOSENSORS-BASEL 2018; 8:bios8040104. [PMID: 30388865 PMCID: PMC6316038 DOI: 10.3390/bios8040104] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/24/2018] [Accepted: 10/29/2018] [Indexed: 12/28/2022]
Abstract
In biomedical science among several other growing fields, the detection of specific biological agents or biomolecular markers, from biological samples is crucial for early diagnosis and decision-making in terms of appropriate treatment, influencing survival rates. In this regard, immunosensors are based on specific antibody-antigen interactions, forming a stable immune complex. The antigen-specific detection antibodies (i.e., biomolecular recognition element) are generally immobilized on the nanomaterial surfaces and their interaction with the biomolecular markers or antigens produces a physico-chemical response that modulates the signal readout. Lowering the detection limits for particular biomolecules is one of the key parameters when designing immunosensors. Thus, their design by combining the specificity and versatility of antibodies with the intrinsic properties of nanomaterials offers a plethora of opportunities for clinical diagnosis. In this review, we show a comprehensive set of recent developments in the field of nanoimmunosensors and how they are progressing the detection and validation for a wide range of different biomarkers in multiple diseases and what are some drawbacks and considerations of the uses of such devices and their expansion.
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Affiliation(s)
- Sandra Lara
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, D04 V1W8 Dublin, Ireland.
| | - André Perez-Potti
- Centre for BioNano Interactions, School of Chemistry, University College Dublin, D04 V1W8 Dublin, Ireland.
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Zhang Q, Wu L, Wong TI, Zhang J, Liu X, Zhou X, Bai P, Liedberg B, Wang Y. Surface plasmon-enhanced fluorescence on Au nanohole array for prostate-specific antigen detection. Int J Nanomedicine 2017; 12:2307-2314. [PMID: 28392689 PMCID: PMC5376189 DOI: 10.2147/ijn.s128172] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Localized surface plasmon (LSP) has been widely applied for the enhancement of fluorescence emission for biosensing owing to its potential for strong field enhancement. However, due to its small penetration depth, LSP offers limited fluorescence enhancement over a whole sensor chip and, therefore, insufficient sensitivity for the detection of biomolecules, especially large molecules. We demonstrate the simultaneous excitation of LSP and propagating surface plasmon (PSP) on an Au nanohole array under Kretschmann configuration for the detection of prostate-specific antigen with a sandwich immunoassay. The proposed method combines the advantages of high field enhancement by LSP and large surface area probed by PSP field. The simulated results indicated that a maximum enhancement of electric field intensity up to 1,600 times can be achieved under the simultaneous excitation of LSP and PSP modes. The sandwich assay of PSA carried out on gold nanohole array substrate showed a limit of detection of 140 fM supporting coexcitation of LSP and PSP modes. The limit of detection was approximately sevenfold lower than that when only LSP was resonantly excited on the same substrate. The results of this study demonstrate high fluorescence enhancement through the coexcitation of LSP and PSP modes and pave a way for its implementation as a highly sensitive bioassay.
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Affiliation(s)
- Qingwen Zhang
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University; Wenzhou Institute of Biomaterials and Engineering, Chinese Academy of Sciences, Wenzhou, People's Republic of China
| | - Lin Wu
- Electronics and Photonics Department, Institute of High Performance Computing
| | - Ten It Wong
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (ASTAR)
| | - Jinling Zhang
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, Singapore
| | - Xiaohu Liu
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, Singapore
| | - Xiaodong Zhou
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (ASTAR)
| | - Ping Bai
- Electronics and Photonics Department, Institute of High Performance Computing
| | - Bo Liedberg
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, Singapore
| | - Yi Wang
- School of Ophthalmology and Optometry, Eye Hospital, School of Biomedical Engineering, Wenzhou Medical University; Wenzhou Institute of Biomaterials and Engineering, Chinese Academy of Sciences, Wenzhou, People's Republic of China; Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, Singapore
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Tawa K, Kondo F, Sasakawa C, Nagae K, Nakamura Y, Nozaki A, Kaya T. Sensitive detection of a tumor marker, α-fetoprotein, with a sandwich assay on a plasmonic chip. Anal Chem 2015; 87:3871-6. [PMID: 25719730 DOI: 10.1021/ac504642j] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Two types of plasmonic silver- and gold-coated grating biosensor chips (plasmonic chip) were applied in the detection of α-fetoprotein (AFP) with a sandwich imunoassay and surface plasmon field-enhanced fluorescence. On the plasmonic chip, unlabeled marker in the sandwich immunoassay was first quantitatively detected over a wide range between 10(-12) and 10(-8) g/mL. The affinity constants between AFP and anti-AFP antibody, which were obtained by fitting the experimental data to the Langmuir isotherm adsorption curve, were 1 × 10(8) g(-1) mL regardless of the kind of metal in the plasmonic chips. Although the fluorescence intensity on the silver plasmonic chip was 5 times larger than that on the gold plasmonic chip, the limit of detection (LOD) was on the order of 10(-11) g/mL and not improved with a silver plasmonic chip. Herein, we used a new setup that generated less dispersions of both the fluorescence intensity for nonspecific adsorption and the background (optical blank) signal and improved the LOD of AFP to 4 pg/mL (55 fM) with the silver plasmonic chip. With the highly sensitive detection in the sandwich immunoassay, the development of a plasmonic chip for clinical diagnosis by a blood test is promising.
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Affiliation(s)
- Keiko Tawa
- †Health Research Institute, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.,§Department of Chemistry, Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
| | - Fusanori Kondo
- †Health Research Institute, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.,§Department of Chemistry, Graduate School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan
| | - Chisato Sasakawa
- †Health Research Institute, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Kousuke Nagae
- ‡Konica Minolta Inc., No.1 Sakuramachi, Hino-shi, Tokyo 191-8511, Japan
| | - Yukito Nakamura
- ‡Konica Minolta Inc., No.1 Sakuramachi, Hino-shi, Tokyo 191-8511, Japan
| | - Akitoshi Nozaki
- ‡Konica Minolta Inc., No.1 Sakuramachi, Hino-shi, Tokyo 191-8511, Japan
| | - Takatoshi Kaya
- ‡Konica Minolta Inc., No.1 Sakuramachi, Hino-shi, Tokyo 191-8511, Japan
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Kaya T, Kaneko T, Kojima S, Nakamura Y, Ide Y, Ishida K, Suda Y, Yamashita K. High-sensitivity immunoassay with surface plasmon field-enhanced fluorescence spectroscopy using a plastic sensor chip: application to quantitative analysis of total prostate-specific antigen and GalNAcβ1-4GlcNAc-linked prostate-specific antigen for prostate cancer diagnosis. Anal Chem 2015; 87:1797-803. [PMID: 25546230 DOI: 10.1021/ac503735e] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A high-sensitivity immunoassay system with surface plasmon field-enhanced fluorescence spectrometry (SPFS) was constructed using a plastic sensor chip and then applied to the detection of total prostate-specific antigen (total PSA) and GalNAcβ1-4GlcNAc-linked prostate-specific antigen (LacdiNAc-PSA) in serum, to discriminate between prostate cancer (PC) and benign prostate hyperplasia (BPH). By using this automated SPFS immunoassay, the detection limit for total PSA in serum was as low as 0.04 pg/mL, and the dynamic range was estimated to be at least five digits. A two-step sandwich SPFS immunoassay for LacdiNAc-PSA was constructed using both the anti-PSA IgG antibody to capture PSA and Wisteria floribunda agglutinin (WFA) for the detection of LacdiNAc. The results of the LacdiNAc-PSA immunoassay with SPFS showed that the assay had a sensitivity of 20.0 pg/mL and permitted the specific distinction between PC and BPH within the PSA gray zone. These results suggested that high-sensitivity automated SPFS immunoassay systems might become a powerful tool for the diagnosis of PC and other diseases.
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Affiliation(s)
- Takatoshi Kaya
- Corporate R&D Headquarters, Konica Minolta, Inc. , No. 1 Sakura-machi, Hino-shi, Tokyo 191-8511, Japan
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Cao SH, Zou ZX, Weng YH, Cai WP, Liu Q, Li YQ. Plasmon-mediated fluorescence with distance independence: From model to a biosensing application. Biosens Bioelectron 2014; 58:258-65. [DOI: 10.1016/j.bios.2014.02.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 02/27/2014] [Indexed: 10/25/2022]
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Tong L, Wei H, Zhang S, Xu H. Recent advances in plasmonic sensors. SENSORS 2014; 14:7959-73. [PMID: 24803189 PMCID: PMC4063061 DOI: 10.3390/s140507959] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 04/16/2014] [Accepted: 04/22/2014] [Indexed: 11/16/2022]
Abstract
Plasmonic sensing has been an important multidisciplinary research field and has been extensively used in detection of trace molecules in chemistry and biology. The sensing techniques are typically based on surface-enhanced spectroscopies and surface plasmon resonances (SPRs). This review article deals with some recent advances in surface-enhanced Raman scattering (SERS) sensors and SPR sensors using either localized surface plasmon resonances (LSPRs) or propagating surface plasmon polaritons (SPPs). The advances discussed herein present some improvements in SERS and SPR sensing, as well as a new type of nanowire-based SPP sensor.
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Affiliation(s)
- Lianming Tong
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
| | - Hong Wei
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
| | - Shunping Zhang
- Center for Nanoscience and Nanotechnology, and School of Physics and Technology, Wuhan University, Wuhan 430072, China.
| | - Hongxing Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
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Cheng MS, Toh CS. Novel biosensing methodologies for ultrasensitive detection of viruses. Analyst 2013; 138:6219-29. [DOI: 10.1039/c3an01394d] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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12
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Scholten A, Menges B, Juebner M, Rothschild MA, Bender K. A mixed alkanethiol based immunosensor for surface plasmon field-enhanced fluorescence spectroscopy in serum. Analyst 2013; 138:1705-12. [DOI: 10.1039/c3an35657d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Bhatnagar K, Pathak A, Menke D, Cornish PV, Gangopadhyay K, Korampally V, Gangopadhyay S. Fluorescence enhancement from nano-gap embedded plasmonic gratings by a novel fabrication technique with HD-DVD. NANOTECHNOLOGY 2012; 23:495201. [PMID: 23154752 DOI: 10.1088/0957-4484/23/49/495201] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We demonstrate strong electromagnetic field enhancement from nano-gaps embedded in silver gratings for visible wavelengths. These structures fabricated using a store-bought HD-DVD worth $10 and conventional micro-contact printing techniques have shown maximum fluorescence enhancement factors of up to 118 times when compared to a glass substrate under epi-fluorescent conditions. The novel fabrication procedure provides for the development of a cost-effective and facile plasmonic substrate for low-level chemical and biological detection. Electromagnetic field simulations were also performed that reveal the strong field confinement in the nano-gap region embedded in the silver grating, which is attributed to the combined effect of localized as well as propagating surface plasmons.
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Affiliation(s)
- K Bhatnagar
- Department of Electrical and Computer Engineering, University of Missouri-Columbia, Columbia, MO 65211, USA
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Su LC, Chang CM, Tseng YL, Chang YF, Li YC, Chang YS, Chou C. Rapid and highly sensitive method for influenza A (H1N1) virus detection. Anal Chem 2012; 84:3914-20. [PMID: 22401570 DOI: 10.1021/ac3002947] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, we applied the developed paired surface plasma waves biosensor (PSPWB) in a dual-channel biosensor for rapid and sensitive detection of swine-origin influenza A (H1N1) virus (S-OIV). In conjunction with the amplitude ratio of the signal and the reference channel, the stability of the PSPWB system is significantly improved experimentally. The theoretical limit of detection (LOD) of the dual-channel PSPWB for S-OIV is 30 PFU/mL (PFU, plaque-forming unit), which was calculated from the fitting curve of the surface plasmon resonance signal with a S-OIV clinical isolate concentration in phosphate-buffered saline (PBS) over a range of 18-1.8 × 10(6) PFU/mL. The LOD is 2 orders of magnitude more sensitive than the commercial rapid influenza diagnostic test at worst and an order of magnitude less sensitive than real-time quantitative polymerase chain reaction (PCR) whose LOD for S-OIV in PBS was determined to be 3.5 PFU/mL in this experiment. Furthermore, under in vivo conditions, this experiment demonstrates that the assay successfully measured S-OIV at a concentration of 1.8 × 10(2) PFU/mL in mimic solution, which contained PBS-diluted normal human nasal mucosa. Most importantly, the assay time took less than 20 min. From the results, the dual-channel PSPWB potentially offers great opportunity in developing an alternative PCR-free diagnostic method for rapid, sensitive, and accurate detection of viral pathogens with epidemiological relevance in clinical samples by using an appropriate pathogen-specific antibody.
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Affiliation(s)
- Li-Chen Su
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320
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15
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Vaish A, Liao WS, Shuster MJ, Hinds JM, Weiss PS, Andrews AM. Thin gold film-assisted fluorescence spectroscopy for biomolecule sensing. Anal Chem 2011; 83:7451-6. [PMID: 21866911 DOI: 10.1021/ac2016536] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a configuration for fluorescence spectroscopy that exploits the optical properties of semitransparent gold films and widely available instrumentation. This method enables monitoring of biomolecule interactions with small molecules tethered on substrates in multicomponent environments. The neurotransmitter serotonin (5-hydroxytryptamine) was covalently attached to self-assembled monolayers on thin gold films at low density to facilitate antibody recognition. Protein-binding studies were performed in a fluorescently labeled immunoassay format. We find that the use of this method enables evaluation of nonspecific binding and relative quantification of specific binding between competing binding partners. This fluorescence spectroscopy technique has the potential to assess biosensor or medical device responses in complex biological matrices.
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Affiliation(s)
- Amit Vaish
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095-7227, USA
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16
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Bolduc OR, Masson JF. Advances in surface plasmon resonance sensing with nanoparticles and thin films: nanomaterials, surface chemistry, and hybrid plasmonic techniques. Anal Chem 2011; 83:8057-62. [PMID: 21842880 DOI: 10.1021/ac2012976] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nanomaterials developed for localized surface plasmon resonance (LSPR) are increasingly integrated to classical prism-based SPR sensors, providing enhanced sensitivity and lower detection limits. The unique properties of these novel nanomaterials in addition to novel surface chemistry to minimize nonspecific adsorption and surface plasmon-coupled techniques with other spectroscopic or mass spectrometry techniques are highlighted in this article.
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Affiliation(s)
- Olivier R Bolduc
- Département de Chimie, Université de Montréal, Montréal, Quebec, Canada
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Tawa K, Umetsu M, Hattori T, Kumagai I. Zinc Oxide-Coated Plasmonic Chip Modified with a Bispecific Antibody for Sensitive Detection of a Fluorescent Labeled-Antigen. Anal Chem 2011; 83:5944-8. [DOI: 10.1021/ac200898e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keiko Tawa
- Health Research Institute, AIST, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Mitsuo Umetsu
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Center for Interdisciplinary Research, Tohoku University, Sendai 980-8579, Japan
| | - Takamitsu Hattori
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Izumi Kumagai
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
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Abstract
Surface plasmon resonance (SPR) is a label-free detection method by which molecular interactions may be analyzed on a surface. Binding data are collected in real time, allowing the determination of interaction kinetics. SPR imaging (SPRi), the focus of this review, improves upon the efficiency of SPR by facilitating analysis of multiple interactions simultaneously. Here we summarize the principles of SPRi, provide examples of how SPRi arrays can be fabricated, and illustrate the utility of SPRi through example applications from the fields of proteomics, genomics and bioengineering.
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19
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Vaish A, Shuster MJ, Cheunkar S, Weiss PS, Andrews AM. Tuning stamp surface energy for soft lithography of polar molecules to fabricate bioactive small-molecule microarrays. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:1471-9. [PMID: 21538866 DOI: 10.1002/smll.201100094] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Indexed: 05/22/2023]
Abstract
Soft-lithography-based techniques are widely used to fabricate microarrays. Here, the use of microcontact insertion printing is described, a soft-lithography method specifically developed for patterning at the dilute scales necessary for highly selective biorecognition. By carefully tuning the polar surface energy of polymeric stamps, problems associated with patterning hydrophilic tether molecules inserted into hydrophilic host self-assembled monolayers (SAMs) are surmounted. Both prefunctionalized tethers and on-chip functionalization of SAMs patterned by microcontact insertion printing enable the fabrication of small-molecule microarrays. Substrates patterned with the neurotransmitter precursor 5-hydroxytryptophan selectively capture a number of different types of membrane-associated receptor proteins, which are native binding partners evolved to recognize free serotonin. These advances provide new avenues for chemically patterning small molecules and fabricating small molecule microarrays with highly specific molecular recognition capabilities.
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Affiliation(s)
- Amit Vaish
- Department of Bioengineering, Pennsylvania State University, University Park, PA 16802, USA
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Su LC, Chen RC, Li YC, Chang YF, Lee YJ, Lee CC, Chou C. Detection of Prostate-Specific Antigen with a Paired Surface Plasma Wave Biosensor. Anal Chem 2010; 82:3714-8. [DOI: 10.1021/ac100071h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Li-Chen Su
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Ran-Chou Chen
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Ying-Chang Li
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Ying-Feng Chang
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Yi-Jang Lee
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Cheng-Chung Lee
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
| | - Chien Chou
- Department of Optics and Photonics, National Central University, Taoyuan, Taiwan, 320, Institute of Biomedical Imaging and Radiological Sciences and Institute of Biophotonics, National Yang Ming University, Taipei, Taiwan, 112, Department of Radiology, Taipei City Hospital Heping Branch, Taipei, Taiwan, 106, and Graduate Institute of Electro-Optical Engineering, Chang Gung University, Taoyuan, Taiwan, 333
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21
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Liu Y, Xu S, Tang B, Wang Y, Zhou J, Zheng X, Zhao B, Xu W. Note: Simultaneous measurement of surface plasmon resonance and surface-enhanced Raman scattering. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2010; 81:036105. [PMID: 20370228 DOI: 10.1063/1.3321313] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A surface plasmon resonance (SPR)-surface enhanced Raman scattering (SERS) microspectrometer was designed to obtain the incident angle dependence of SERS signals excited by the evanescent field. By simultaneous measurement of the SERS and SPR spectra of analytes, the highest SERS signal intensities were found to appear at the vicinity of the resonance angle. The enhancement factor was about 2.0x10(6). The simulated angle of the maximal SERS intensity based on Fresnel equation was found to be in good agreement with the experimental results. The SERS and SPR spectra captured simultaneously not only directly confirm the correlation between the SERS and SPR but also present a potential technique for obtaining the structure information about the analytes in molecule level with recording their SPR curves.
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Affiliation(s)
- Yu Liu
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, People's Republic of China
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22
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Drexler K, Smirnova J, Galetskaya M, Voss S, Fonin M, Boneberg J, Rüdiger U, Leiderer P, Steiner UE. X-ray photoelectron spectroscopy- and surface plasmon resonance-detected photo release of photolabile protecting groups from nucleoside self-assembled monolayers on gold surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:10794-10801. [PMID: 19603744 DOI: 10.1021/la901346s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The formation of self-assembled monolayers (SAMs) on gold by 2-(5-iodo-2-nitrophenyl) propoxycarbonyl (I-NPPOC)-protected thymidine with an attached mercaptohexyl succinate linker and the kinetics of photochemical release of the I-NPPOC group were monitored using X-ray photoelectron spectroscopy (XPS) and surface plasmon resonance (SPR) detection. In the XPS spectra, the iodine peaks allowed for specific and accurate monitoring of the presence and loss of I-NPPOC groups on the surface. In the SPR experiment, the overall signal change on photoillumination is in accord with a theoretical estimation of the density of I-NPPOC groups in a dense monolayer. The kinetics roughly follow a biexponential time dependence with two very different time constants, corresponding to photochemical quantum yields of 0.22 and 0.0032, respectively.
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Affiliation(s)
- Katja Drexler
- Department of Chemistry, University of Konstanz, Konstanz, Germany
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23
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Microarray immunoassay for the detection of grapevine and tree fruit viruses. J Virol Methods 2009; 160:90-100. [DOI: 10.1016/j.jviromet.2009.04.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 04/20/2009] [Accepted: 04/23/2009] [Indexed: 11/22/2022]
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24
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Song H, Ritz S, Knoll W, Sinner EK. Conformation and topology of amyloid beta-protein adsorbed on a tethered artificial membrane probed by surface plasmon field-enhanced fluorescence spectroscopy. J Struct Biol 2009; 168:117-24. [PMID: 19576283 DOI: 10.1016/j.jsb.2009.06.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 06/04/2009] [Accepted: 06/24/2009] [Indexed: 10/20/2022]
Abstract
Progressive depositions of cerebral amyloid are primary neuropathologic features of Alzheimer's disease (AD). The amyloid is composed of a 39-42 amino acid peptide called the amyloid beta-protein (Abeta). Repeated investigation suggests that the conformational transition of Abeta from alpha-helix or random coil to beta-sheet structure plays a key role in the inappropriate accumulation of cerebral amyloid plaques. In this manuscript, we describe a fluorescence-based immunoassay technology to investigate the conformation and topology of Abeta peptides interacting with peptide-tethered planar lipid bilayers. Dual monoclonal antibodies (mAbs) labelled with fluorophores were employed to recognise a linear N- and a beta-sheet C-terminus of Abeta peptides on the model membrane, respectively. Kinetics of antibody-Abeta binding were determined by surface plasmon field-enhanced fluorescence spectroscopy (SPFS). The conformational transition of Abeta by melatonin, a defined beta-sheet breaker, was probed using paired monoclonal antibodies. The Abeta interaction with the membrane was evaluated by carefully analyzing the change in kinetic/affinity parameters in the presence or absence of melatonin. These results show that SPFS can be used to examine conformational transition of Abeta on an artificial membrane, providing a novel and versatile platform for conveniently monitoring protein-membrane interaction and screening for new beta-sheet breakers.
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Affiliation(s)
- Haipeng Song
- Max Planck Institute for Polymer Research, Mainz, Germany
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25
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Cho NJ, Wang G, Edvardsson M, Glenn JS, Hook F, Frank CW. Alpha-Helical Peptide-Induced Vesicle Rupture Revealing New Insight into the Vesicle Fusion Process As Monitored in Situ by Quartz Crystal Microbalance-Dissipation and Reflectometry. Anal Chem 2009; 81:4752-61. [DOI: 10.1021/ac900242s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nam-Joon Cho
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - Guoliang Wang
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - Malin Edvardsson
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - Jeffrey S. Glenn
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - Fredrik Hook
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
| | - Curtis W. Frank
- Division of Gastroenterology, School of Medicine, Stanford University, Stanford, California 94305, Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Division of Biological Physics, Chalmers University of Technology, Gothenburg, Sweden
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26
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Xie TT, Liu Q, Cai WP, Chen Z, Li YQ. Surface plasmon-coupled directional emission based on a conformational-switching signaling aptamer. Chem Commun (Camb) 2009:3190-2. [PMID: 19587909 DOI: 10.1039/b823352g] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have observed highly polarized and directional surface plasmon-coupled emission of a signaling aptamer due to the binding of a target thrombin with the aptamer, which induces conformational switching.
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Affiliation(s)
- Tang-Tang Xie
- Department of Chemistry, College of Chemistry and Chemical Engineering, The Key Laboratory of Analytical Sciences of the Ministry of Education, Xiamen University, Xiamen, Fujian 361005, China
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27
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Sugawa K, Akiyama T, Kawazumi H, Yamada S. Plasmon-enhanced photocurrent generation from self-assembled monolayers of phthalocyanine by using gold nanoparticle films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3887-3893. [PMID: 19708159 DOI: 10.1021/la803831c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The effect of localized electric fields on the photocurrent responses of phthalocyanine that was self-assembled on a gold nanoparticle film was investigated by comparing the conventional and the total internal reflection (TIR) experimental systems. In the case of photocurrent measurements, self-assembled monolayers (SAMs) of a thiol derivative of palladium phthalocyanine (PdPc) were prepared on the surface of gold-nanoparticle film that was fixed on the surface of indium-tin-oxide (ITO) substrate via a polyion (PdPc/AuP/polyion/ITO) or on the ITO surface (PdPc/ITO). Photocurrent action spectra from the two samples were compared by using the conventional spectrometer, and were found that PdPc/AuP/polyion/ITO gave considerably larger photocurrent signals than PdPc/ITO under the identical concentration of PdPc. In the case of the TIR experiments for the PdPc/AuP/polyion/ITO and the PdPc/AuP/Glass systems, incident-angle profiles of photocurrent and emission signals were correlated with each other, and they were different from that of the PdPc/ITO system. Accordingly, it was demonstrated that the photocurrent signals were certainly enhanced by the localized electric fields of the gold-nanoparticle film.
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Affiliation(s)
- Kosuke Sugawa
- Department of Materials Physics and Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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28
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Mastichiadis C, Petrou PS, Christofidis I, Misiakos K, Kakabakos SE. Bulk fluorescence light blockers to improve homogeneous detection in capillary-waveguide fluoroimmunosensors. Biosens Bioelectron 2009; 24:2735-9. [DOI: 10.1016/j.bios.2009.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2008] [Revised: 12/12/2008] [Accepted: 01/05/2009] [Indexed: 12/18/2022]
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29
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A label-free visual immunoassay on solid support with silver nanoparticles as plasmon resonance scattering indicator. Anal Biochem 2008; 383:168-73. [DOI: 10.1016/j.ab.2008.08.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 08/14/2008] [Accepted: 08/18/2008] [Indexed: 11/21/2022]
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30
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Guo SH, Heetderks JJ, Kan HC, Phaneuf RJ. Enhanced fluorescence and near-field intensity for Ag nanowire/nanocolumn arrays: evidence for the role of surface plasmon standing waves. OPTICS EXPRESS 2008; 16:18417-18425. [PMID: 18958120 DOI: 10.1364/oe.16.018417] [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
We use scanning fluorescence microscopy and electron beam lithography to probe the mechanism of fluorescence enhancement by periodic arrays of silver nanostructures, determining the optimum size and spacing of both Ag nanowires and Ag nanocolumns for incident light of different wavelengths and polarizations. Finite difference time domain (FDTD) calculations show a systematic variation with spatial period and incident polarization of the local electric field above the surface of the arrays which correlate well with that of the measured fluorescence enhancement, but a lack of a simple proportionality indicates that the dependence of the radiative and nonradiative decay rates on array geometry must be included in models for this effect. The dependence of the enhancement on spatial period and polarization indicates the importance of surface plasmon standing waves in this effect.
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Affiliation(s)
- Shy-Hauh Guo
- Department of Electrical and Computer Engineering, University of Maryland, College Park, MD 20740, USA
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31
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Aslan K, Previte MJR, Zhang Y, Geddes CD. Surface Plasmon Coupled Fluorescence in the Ultraviolet and Visible Spectral Regions Using Zinc Thin Films. Anal Chem 2008; 80:7304-12. [DOI: 10.1021/ac800923n] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kadir Aslan
- Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics and Laboratory for Advanced Fluorescence Spectroscopy, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Michael J. R. Previte
- Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics and Laboratory for Advanced Fluorescence Spectroscopy, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Yongxia Zhang
- Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics and Laboratory for Advanced Fluorescence Spectroscopy, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Chris D. Geddes
- Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics and Laboratory for Advanced Fluorescence Spectroscopy, Medical Biotechnology Center, University of Maryland Biotechnology Institute, 725 West Lombard Street, Baltimore, Maryland 21201
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32
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Trnavsky M, Enderlein J, Ruckstuhl T, McDonagh C, MacCraith BD. Experimental and theoretical evaluation of surface plasmon-coupled emission for sensitive fluorescence detection. JOURNAL OF BIOMEDICAL OPTICS 2008; 13:054021. [PMID: 19021401 DOI: 10.1117/1.2978067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Surface plasmon-coupled emission (SPCE) is a phenomenon whereby the light emitted from a fluorescent molecule can couple into the surface plasmon of an adjacent metal layer, resulting in highly directional emission in the region of the surface plasmon resonance (SPR) angle. In addition to high directionality of emission, SPCE has the added advantage of surface selectivity in that the coupling diminishes with increasing distance from the surface. This effect can be exploited in bioassays whereby a fluorescing background from the sample can be suppressed. We have investigated, both theoretically and experimentally, the SPCE effect for a Cy5-spacer-Ag layer system. Both the angular dependence of emission and the dependence of SPCE emission intensity on Cy5-metal separation were investigated. It is demonstrated that SPCE leads to lower total fluorescence signal than that obtained in the absence of a metal layer. This is the first experimental verification of the reduction in SPCE intensity compared to the metal-free case. Our results are in a good agreement with theoretical models. The validation of the theoretical model provides a basis for optimizing biosensor platform performance, particularly in the context of the advantages offered by SPCE of highly directional emission and surface selectivity.
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Affiliation(s)
- Michal Trnavsky
- Dublin City University, Biomedical Diagnostics Institute, National Centre for Sensor Research, School of Physical Sciences, Glasnevin, Dublin 9, Ireland
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33
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Seidel M, Niessner R. Automated analytical microarrays: a critical review. Anal Bioanal Chem 2008; 391:1521-44. [PMID: 18504563 PMCID: PMC7080066 DOI: 10.1007/s00216-008-2039-3] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 02/25/2008] [Accepted: 02/28/2008] [Indexed: 11/24/2022]
Abstract
Microarrays provide a powerful analytical tool for the simultaneous detection of multiple analytes in a single experiment. The specific affinity reaction of nucleic acids (hybridization) and antibodies towards antigens is the most common bioanalytical method for generating multiplexed quantitative results. Nucleic acid-based analysis is restricted to the detection of cells and viruses. Antibodies are more universal biomolecular receptors that selectively bind small molecules such as pesticides, small toxins, and pharmaceuticals and to biopolymers (e.g. toxins, allergens) and complex biological structures like bacterial cells and viruses. By producing an appropriate antibody, the corresponding antigenic analyte can be detected on a multiplexed immunoanalytical microarray. Food and water analysis along with clinical diagnostics constitute potential application fields for multiplexed analysis. Diverse fluorescence, chemiluminescence, electrochemical, and label-free microarray readout systems have been developed in the last decade. Some of them are constructed as flow-through microarrays by combination with a fluidic system. Microarrays have the potential to become widely accepted as a system for analytical applications, provided that robust and validated results on fully automated platforms are successfully generated. This review gives an overview of the current research on microarrays with the focus on automated systems and quantitative multiplexed applications.
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Affiliation(s)
- Michael Seidel
- Chair for Analytical Chemistry and Institute of Hydrochemistry, Technische Universität München, Marchioninistrasse 17, 81377, München, Germany.
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34
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Luo Y, Yu F, Zare RN. Microfluidic device for immunoassays based on surface plasmon resonance imaging. LAB ON A CHIP 2008; 8:694-700. [PMID: 18432338 DOI: 10.1039/b800606g] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We have designed and fabricated a polydimethylsiloxane (PDMS) microfluidic device containing an array of gold spots onto which antigens or antibodies of interest can be attached. We use surface plasmon resonance (SPR) imaging to monitor the antibody-antigen recognition and binding events. This combination offers two significant advantages: (1) the microfluidic device dramatically reduces reaction time and sample consumption; and (2) the SPR imaging yields real-time detection of the immunocomplex formation. Thus, an immunoreaction may be detected and quantitatively characterized in about 10 min. The sensitivity of this method is at the subnanomolar level. When gold nanoparticles are selectively coupled to the immunocomplex to cause signal amplification, the sensitivity reaches the ten to one hundred picomolar level but the time required increases to about 60 min.
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Affiliation(s)
- Yiqi Luo
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA
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35
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Vareiro MMLM, Tranchant I, Maplin S, Zak K, Gani MM, Slevin CJ, Hailes HC, Tabor AB, Cameron PJ, Jenkins ATA, Williams DE. Surface plasmon resonance-enhanced fluorescence implementation of a single-step competition assay: demonstration of fatty acid measurement using an anti-fatty acid monoclonal antibody and a Cy5-labeled fatty acid. Anal Biochem 2008; 377:243-50. [PMID: 18381194 DOI: 10.1016/j.ab.2008.03.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Revised: 03/08/2008] [Accepted: 03/10/2008] [Indexed: 11/29/2022]
Abstract
The development of a single-step, separation-free method for measurement of low concentrations of fatty acid using a surface plasmon resonance-enhanced fluorescence competition assay with a surface-bound antibody is described. The assay behavior was unexpectedly complex. A nonlinear coverage-dependent self-quenching of emission from surface-bound fluorescent label was deduced from the response kinetics and attributed to a surface plasmon-mediated energy transfer between adsorbed fluorophores, modified by the effects of plasmon interference. Principles of assay design to avoid complications from such effects are discussed. An anti-fatty acid mouse monoclonal antibody reacting to the alkyl chain was prepared and supported on a gold chip at a spacing appropriate for surface-plasmon field-enhanced fluorescence spectroscopy (SPEFS), by applying successively a self-assembled biotinylated monolayer, then streptavidin, then biotinylated protein A, and then the antibody, which was crosslinked to the protein A. Synthesis of a fluorescently (Cy5) tagged C-11 fatty acid is reported. SPEFS was used to follow the kinetics of the binding of the labeled fatty acid to the antibody, and to implement a competition assay with free fatty acid (undecanoic acid), sensitive at the 1 microM scale, a sensitivity limit caused by the low affinity of antibodies for free fatty acids, rather than the SPEFS technique itself. Free fatty acid concentration in human serum is in the range 0.1-1mM, suggesting that this measurement approach could be applied in a clinical diagnostic context. Finally, a predictive, theoretical model of fatty acid binding was developed that accounted for the observed "overshoot" kinetics.
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Ahl S, Cameron PJ, Liu J, Knoll W, Erlebacher J, Yu F. A Comparative Plasmonic Study of Nanoporous and Evaporated Gold Films. PLASMONICS (NORWELL, MASS.) 2008; 3:13-20. [PMID: 19816537 PMCID: PMC2758361 DOI: 10.1007/s11468-007-9048-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Accepted: 11/14/2007] [Indexed: 05/20/2023]
Abstract
Previously, we have reported that nanoporous gold (NPG) films prepared by a chemical dealloying method have distinctive plasmonic properties, i.e., they can simultaneously support localized and propagating surface plasmon resonance modes (l-SPR and p-SPR, respectively). In this study, the plasmonic properties of NPG are quantified through direct comparison with thermally evaporated gold (EG) films. Cyclic voltammetry and electrochemical impedance spectroscopy experiments reveal that the NPG films have 4-8.5 times more accessible surface area than EG films. Assemblies of streptavidin-latex beads generate p-SPR responses on both NPG and EG films that correlate well with the bead density obtained from scanning electron microscopy (SEM) images. A layer-by-layer assembly experiment on NPG involving biotinylated anti-avidin IgG and avidin, studied by l-SPR and SEM, shows that the l-SPR signal is directly linked to the accessibility of the interior of the NPG porosity, an adjustable experimental parameter that can be set by the dealloying condition and time. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11468-007-9048-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Stefanie Ahl
- Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Petra J. Cameron
- Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Chemistry, University of Bath, Bath, BA2 2TB UK
| | - Jing Liu
- Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Siemens X-Ray Vacuum Technology Ltd., Wuxi, 214028 People’s Republic of China
| | - Wolfgang Knoll
- Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Jonah Erlebacher
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218 USA
| | - Fang Yu
- Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Chemistry, Stanford University, Stanford, CA 94305 USA
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37
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Liu AQ, Huang HJ, Chin LK, Yu YF, Li XC. Label-free detection with micro optical fluidic systems (MOFS): a review. Anal Bioanal Chem 2008; 391:2443-52. [DOI: 10.1007/s00216-008-1878-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2007] [Revised: 01/09/2008] [Accepted: 01/10/2008] [Indexed: 01/09/2023]
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38
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Kim YP, Oh YH, Kim HS. Protein kinase assay on peptide-conjugated gold nanoparticles. Biosens Bioelectron 2008; 23:980-6. [DOI: 10.1016/j.bios.2007.10.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Accepted: 10/02/2007] [Indexed: 11/28/2022]
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39
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Peptid-tethered bilayer lipid membranes and their interaction with Amyloid ß-peptide. Biointerphases 2007; 2:151-8. [DOI: 10.1116/1.2804746] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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40
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Siiman O, Jitianu A, Bele M, Grom P, Matijević E. Amplified light scattering and emission of silver and silver core–silica shell particles. J Colloid Interface Sci 2007; 309:8-20. [PMID: 17346732 DOI: 10.1016/j.jcis.2007.02.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Accepted: 02/02/2007] [Indexed: 10/23/2022]
Abstract
Side versus forward light scattergrams, and fluorescence (488 nm excitation) intensity versus particle count histograms were gathered for bare, R6G-coated, and silica-R6G-coated silver particles of 150-200 nm diameter, one-by-one by flow cytometry. Fluorescence emission intensity of the composite particles monotonically increased and then reached a plateau with greater R6G concentrations, as measured by flow cytometry. Fluorescence amplification factors of up to 3.5x10(3) were estimated by reference to measurements on core-shell particles with silica instead of silver cores. Huge surface enhanced Raman scattering (SERS) intensities, at least 10(14)-fold greater than normal Raman scattering intensities, were observed with 633 nm excitation for molecules such as rhodamine 6G (R6G) on the same single particles of silver. Although routine transmission (TEM) and scanning (SEM) electron microscopies showed gross structures of the bare and coated particles, high-resolution field emission scanning electron microscopy (FE-SEM), revealed Brownian roughness describing quantum size and larger structures on the surface of primary colloidal silver particles. These silver particles were further characterized by extinction spectra and zeta potentials. Structural and light scattering observations that are reported herein were used to tentatively propose a new hierarchical model for the mechanism of SERS.
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Affiliation(s)
- Olavi Siiman
- Advanced Technology Center, Beckman Coulter, Inc., 11800 SW 147th Avenue, Miami, FL 33196-2500, USA
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41
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Gryczynski I, Malicka J, Lukomska J, Gryczynski Z, R. Lakowicz J. Surface Plasmon-coupled Polarized Emission of N-Acetyl-l-Trytophanamide¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00118.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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42
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Haushalter JP, Faris GW. Strategy for photostable proximity bioassays using lanthanides. APPLIED OPTICS 2007; 46:1918-23. [PMID: 17356638 PMCID: PMC3223418 DOI: 10.1364/ao.46.001918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report initial findings for research aimed at creating photostable lanthanide chelate reporters for proximity assays. These reporters take advantage of the nanometer-scale distance dependence of fluorescence enhancement for molecules in the vicinity of noble metal nanoparticles and also capitalize on some unique properties of lanthanide chelates. This approach promises to lead to proximity assays that do not suffer from photobleaching and offer very high on/off enhancement ratios. Results for lanthanide chelates on silver island films and in colloidal suspensions are reported. Enhancement factors range from 1 to 2 orders of magnitude, with larger enhancements for strongly quenched lanthanides.
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43
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Gensch T, Komolov KE, Senin II, Philippov PP, Koch KW. Ca2+-dependent conformational changes in the neuronal Ca2+-sensor recoverin probed by the fluorescent dye Alexa647. Proteins 2007; 66:492-9. [PMID: 17078090 DOI: 10.1002/prot.21231] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Recoverin belongs to the superfamily of EF-hand Ca2+-binding proteins and operates as a Ca2+-sensor in vertebrate photoreceptor cells, where it regulates the activity of rhodopsin kinase GRK1 in a Ca2+-dependent manner. Ca2+-dependent conformational changes in recoverin are allosterically controlled by the covalently attached myristoyl group. The amino acid sequence of recoverin harbors a unique cysteine at position 38. The cysteine can be modified by the fluorescent dye Alexa647 using a maleimide-thiol coupling step. Introduction of Alexa647 into recoverin did not disturb the biological function of recoverin, as it can regulate rhodopsin kinase activity like unlabeled recoverin. Performance of the Ca2+-myristoyl switch of labeled recoverin was monitored by Ca2+-dependent association with immobilized lipids using surface plasmon resonance spectroscopy. When the Ca2+-concentration was varied, labeled myristoylated recoverin showed a 37%-change in fluorescence emission and a 34%-change in excitation intensity, emission and excitation maxima shifted by 6 and 18 nm, respectively. In contrast, labeled nonmyristoylated recoverin exhibited only minimal changes. Time-resolved fluorescence measurements showed biexponentiell fluorescence decay, in which the slower time constant of 2 ns was specifically influenced by Ca2+-induced conformational changes. A similar influence on the slower time constant was observed with the recoverin mutant RecE85Q that has a disabled EF-hand 2, but no such influence was detected with the mutant RecE121Q (EF-hand 3 is nonfunctional) that contains the myristoyl group in a clamped position. We conclude from our results that Alexa647 bound to cysteine 38 can monitor the conformational transition in recoverin that is under control of the myristoyl group.
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Affiliation(s)
- Thomas Gensch
- IBI-1, Forschungszentrum Jülich, Jülich D-52425, Germany
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44
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Chapter 3 Surface Plasmon Optics for the Characterization of Biofunctional Architectures. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s1573-4285(06)14003-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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45
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Wiltschi B, Knoll W, Sinner EK. Binding assays with artificial tethered membranes using surface plasmon resonance. Methods 2006; 39:134-46. [PMID: 16857384 DOI: 10.1016/j.ymeth.2006.05.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Accepted: 05/01/2006] [Indexed: 11/25/2022] Open
Abstract
Surface sensitive optical techniques based on surface plasmon resonance have become interesting for biosciences in the context of biorecognition and binding studies at functional surfaces. We use surface plasmon resonance spectroscopy (SPS) in combination with surface plasmon enhanced fluorescence spectroscopy (SPFS) for the characterization of interaction processes associated with biomembranes. The biological membrane is mimicked by a tethered membrane consisting of a planar lipid bilayer attached to a gold surface via a hydrophilic anchor peptide. The interaction between membrane-bound hydrophobic compounds and free hydrophilic molecules is monitored in real-time and with high sensitivity and selectivity by combined SPS/SPFS. In this review we shortly discuss the principles of surface plasmon resonance and its utilization in SPS and SPFS. A detailed description of the required instrumentation for combined SPS and SPFS is presented. Furthermore, we outline the design of a binding assay with a tethered bilayer and the procedure of the artificial membrane system built-up is delineated. We also present examples that demonstrate the potential of combined SPS/SPFS assays with artificial tethered membranes. The method provides insight into the interaction of integral membrane proteins with various hydrophilic ligands and the specific recognition of small lipophilic molecules by soluble proteins.
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Affiliation(s)
- Birgit Wiltschi
- Max Planck Institute for Biochemistry, Department of Membrane Biochemistry, D-82152 Martinsried, Germany.
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46
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Boozer C, Kim G, Cong S, Guan H, Londergan T. Looking towards label-free biomolecular interaction analysis in a high-throughput format: a review of new surface plasmon resonance technologies. Curr Opin Biotechnol 2006; 17:400-5. [PMID: 16837183 DOI: 10.1016/j.copbio.2006.06.012] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2006] [Revised: 06/02/2006] [Accepted: 06/30/2006] [Indexed: 11/19/2022]
Abstract
Surface plasmon resonance (SPR) biosensors have enabled a wide range of applications in which researchers can monitor biomolecular interactions in real time. Owing to the fact that SPR can provide affinity and kinetic data, unique features in applications ranging from protein-peptide interaction analysis to cellular ligation experiments have been demonstrated. Although SPR has historically been limited by its throughput, new methods are emerging that allow for the simultaneous analysis of many thousands of interactions. When coupled with new protein array technologies, high-throughput SPR methods give users new and improved methods to analyze pathways, screen drug candidates and monitor protein-protein interactions.
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47
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Chen Q. Stability of an Ultrathin Plasma Polymerized Film in Aqueous Solution: In Situ Detection by Surface Plasmon Resonance. J Phys Chem B 2006; 110:9231-5. [PMID: 16671738 DOI: 10.1021/jp057598n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recently, surface plasmon resonance (SPR) has been successfully implemented to characterize the film stability in real time: a radio frequency (RF) plasma polymerized film was monitored by swelling or extracting behaviors in aqueous solution. The high-resolution SPR revealed that film stability strongly depended on the monomers, plasma mode, and substrate locations as well as plasma polymerization conditions: incident power and working pressure. By Fourier transform infrared (FTIR), the possible reasons of film stabilization affected by plasma conditions and sample locations are explained. It is recommended that as an adhesive layer for future applications the plasma polymerized polymer shall be prepared in low working pressure pulsed plasma.
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Affiliation(s)
- Qiang Chen
- Laboratory of Plasma Physics and Materials, Beijing Institute of Graphic Communication, Beijing, 102600, PR China
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48
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Kostov Y, Smith DS, Tolosa L, Rao G, Gryczynski I, Gryczynski Z, Malicka J, Lakowicz JR. Directional surface plasmon-coupled emission from a 3 nm green fluorescent protein monolayer. Biotechnol Prog 2006; 21:1731-5. [PMID: 16321058 PMCID: PMC6949142 DOI: 10.1021/bp050114k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High-sensitivity detection schemes are of great interest for a number of applications. Unfortunately, such schemes are usually high-cost. We demonstrate a low-cost approach to a high-sensitivity detection scheme based on surface plasmon-coupled emission (SPCE). The SPCE of a monomolecular layer of green fluorescent protein (GFP) is reported here. The protein was electrostatically attached to a thin, SiO(2)-protected silver film deposited on a quartz substrate. The visible, directional emission of GFP was observed at a sharp, well-defined angle of 47.5 degrees from the normal to the coupling prism, and the spectrum corresponded to that of GFP. The SPCE resulting from the reverse Kretschmann configuration showed a 12-fold enhancement over the free space fluorescence. The directional emission was 97% p-polarized. The directionality and high polarization can be coupled with the intrinsic spectral resolution of SPCE to be used in the design miniaturized spectrofluorometers. The observation of SPCE in the visible region of the spectrum from a monolayer of protein opens up new possibilities in protein-based sensing.
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Affiliation(s)
| | | | | | - Govind Rao
- To whom correspondence should be addressed. (G.R.) Fax: 410-455-6500. . (Z.G.) Fax: 410-706-8408.
| | | | - Zygmunt Gryczynski
- To whom correspondence should be addressed. (G.R.) Fax: 410-455-6500. . (Z.G.) Fax: 410-706-8408.
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49
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Grandin HM, Städler B, Textor M, Vörös J. Waveguide excitation fluorescence microscopy: A new tool for sensing and imaging the biointerface. Biosens Bioelectron 2006; 21:1476-82. [PMID: 16137877 DOI: 10.1016/j.bios.2005.06.011] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Revised: 06/14/2005] [Accepted: 06/17/2005] [Indexed: 11/25/2022]
Abstract
A novel biosensing and imaging technique, the waveguide excitation fluorescence microscope, has been developed for the dynamic and quantitative investigation of bio-interfacial events in situ, ranging from ligand-receptor binding to focal adhesion formation in cell-surface interactions. The technique makes use of the evanescent field created when light travels in a mono-mode, planar optical waveguide to excite fluorescence in the near interface region. Advantages of the technique include high target sensitivity for fluorescence detection (femtomolar range), high surface specificity (ca. 100 nm perpendicular to the waveguide), large area analysis with submicron resolution, 'built-in' calibration of fluorescent light gain, and the capability to perform multi-colour imaging in situ and in real time. In this work, the sensitivity of the system has already been demonstrated through dynamic measurements of the streptavidin-biotin binding event to below 20 pM concentrations, signal to noise comparisons with conventional fluorescence microscopy have shown more than a 10-fold improvement, and surface specificity of the technique has also been illustrated in a comparison of fibroblast focal adhesion images. Thus, this new tool can be used to illuminate processes occurring at the interface between biology and synthetic surfaces in a unique manner.
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Affiliation(s)
- H M Grandin
- BioInterface Group, Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology (ETH) Zurich, Switzerland.
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50
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Smith DS, Kostov Y, Rao G, Gryczynski I, Malicka J, Gryczynski Z, Lakowicz JR. First observation of surface plasmon-coupled emission due to LED excitation. J Fluoresc 2005; 15:895-900. [PMID: 16328699 PMCID: PMC6830068 DOI: 10.1007/s10895-005-0021-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2005] [Accepted: 09/29/2005] [Indexed: 10/25/2022]
Abstract
Detection limitations for fluorescence methods are normally determined by the phenomenon itself rather than the sensitivity of the instrumentation. These limitations make it necessary to have high sensitivity, high cost equipment causing fluorescence methods to remain lab-oriented. Alleviation of the limitations can be achieved through the phenomenon of surface plasmon-coupled emission (SPCE), which displays enhanced, directional, polarized fluorescence. Here we present the excitation of SPCE from Rhodamine B with a light-emitting diode (LED). Incorporating the gains in sensitivity due to SPCE with LED excitation, it could be possible to design low-cost, high-sensitivity sensors that would allow measurements to be performed in the field.
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Affiliation(s)
- Derek S. Smith
- Department of Chemical and Biochemical Engineering, Center for Advanced Sensor Technology, University of Maryland at Baltimore County, 5200 Westland Blvd, Baltimore, Maryland 21227
| | - Yordan Kostov
- Department of Chemical and Biochemical Engineering, Center for Advanced Sensor Technology, University of Maryland at Baltimore County, 5200 Westland Blvd, Baltimore, Maryland 21227
| | - Govind Rao
- Department of Chemical and Biochemical Engineering, Center for Advanced Sensor Technology, University of Maryland at Baltimore County, 5200 Westland Blvd, Baltimore, Maryland 21227
- To whom correspondence should be addressed.
| | - Ignacy Gryczynski
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Joanna Malicka
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Zygmunt Gryczynski
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201
| | - Joseph R. Lakowicz
- Department of Biochemistry and Molecular Biology, Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201
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