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Wang J, Jia Z. Metal Nanoparticles/Porous Silicon Microcavity Enhanced Surface Plasmon Resonance Fluorescence for the Detection of DNA. SENSORS 2018; 18:s18020661. [PMID: 29473918 PMCID: PMC5856129 DOI: 10.3390/s18020661] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 02/15/2018] [Accepted: 02/16/2018] [Indexed: 11/16/2022]
Abstract
A porous silicon microcavity (PSiMC) with resonant peak wavelength of 635 nm was fabricated by electrochemical etching. Metal nanoparticles (NPs)/PSiMC enhanced fluorescence substrates were prepared by the electrostatic adherence of Au NPs that were distributed in PSiMC. The Au NPs/PSiMC device was used to characterize the target DNA immobilization and hybridization with its complementary DNA sequences marked with Rhodamine red (RRA). Fluorescence enhancement was observed on the Au NPs/PSiMC device substrate; and the minimum detection concentration of DNA ran up to 10 pM. The surface plasmon resonance (SPR) of the MC substrate; which is so well-positioned to improve fluorescence enhancement rather the fluorescence enhancement of the high reflection band of the Bragg reflector; would welcome such a highly sensitive in biosensor.
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Affiliation(s)
- Jiajia Wang
- School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China.
| | - Zhenhong Jia
- School of Information Science and Engineering, Xinjiang University, Urumqi 830046, China.
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2
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Sigaut L, Villarruel C, Ponce Dawson S. FCS experiments to quantify Ca 2+ diffusion and its interaction with buffers. J Chem Phys 2017; 146:104203. [PMID: 28298094 DOI: 10.1063/1.4977586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Ca2+ signals are ubiquitous. One of the key factors for their versatility is the variety of spatio-temporal distributions that the cytosolic Ca2+ can display. In most cell types Ca2+ signals not only depend on Ca2+ entry from the extracellular medium but also on Ca2+ release from internal stores, a process which is in turn regulated by cytosolic Ca2+ itself. The rate at which Ca2+ is transported, the fraction that is trapped by intracellular buffers, and with what kinetics are thus key features that affect the time and spatial range of action of Ca2+ signals. The quantification of Ca2+ diffusion in intact cells is quite challenging because the transport rates that can be inferred using optical techniques are intricately related to the interaction of Ca2+ with the dye that is used for its observation and with the cellular buffers. In this paper, we introduce an approach that uses Fluorescence Correlation Spectroscopy (FCS) experiments performed at different conditions that in principle allows the quantification of Ca2+ diffusion and of its reaction rates with unobservable (non-fluorescent) Ca2+ buffers. To this end, we develop the necessary theory to interpret the experimental results and then apply it to FCS experiments performed in a set of solutions containing Ca2+, a single wavelength Ca2+ dye, and a non-fluorescent Ca2+ buffer. We show that a judicious choice of the experimental conditions and an adequate interpretation of the fitting parameters can be combined to extract information on the free diffusion coefficient of Ca2+ and of some of the properties of the unobservable buffer. We think that this approach can be applied to other situations, particularly to experiments performed in intact cells.
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Affiliation(s)
- Lorena Sigaut
- Departamento de Física, FCEN-UBA, and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina
| | - Cecilia Villarruel
- Departamento de Física, FCEN-UBA, and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina
| | - Silvina Ponce Dawson
- Departamento de Física, FCEN-UBA, and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina
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3
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Hare DJ, New EJ. On the outside looking in: redefining the role of analytical chemistry in the biosciences. Chem Commun (Camb) 2016; 52:8918-34. [DOI: 10.1039/c6cc00128a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Analytical chemistry has much to offer to an improved understanding of biological systems.
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Affiliation(s)
- Dominic J. Hare
- Elemental Bio-imaging Facility
- University of Technology Sydney
- Broadway
- Australia
- The Florey Institute of Neuroscience and Mental Health
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4
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Anzalone A, Gabriel M, Estrada LC, Gratton E. Spectral properties of single gold nanoparticles in close proximity to biological fluorophores excited by 2-photon excitation. PLoS One 2015; 10:e0124975. [PMID: 25909648 PMCID: PMC4409109 DOI: 10.1371/journal.pone.0124975] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 03/19/2015] [Indexed: 11/29/2022] Open
Abstract
Metallic nanoparticles (NPs) are able to modify the excitation and emission rates (plasmonic enhancement) of fluorescent molecules in their close proximity. In this work, we measured the emission spectra of 20 nm Gold Nanoparticles (AuNPs) fixed on a glass surface submerged in a solution of different fluorophores using a spectral camera and 2-photon excitation. While on the glass surface, we observed the presence in the emission at least 3 components: i) second harmonic signal (SHG), ii) a broad emission from AuNPS and iii) fluorescence arising from fluorophores nearby. When on the glass surface, we found that the 3 spectral components have different relative intensities when the incident direction of linear polarization was changed indicating different physical origins for these components. Then we measured by fluctuation correlation spectroscopy (FCS) the scattering and fluorescence signal of the particles alone and in a solution of 100 nM EGFP using the spectral camera or measuring the scattering and fluorescence from the particles. We observed occasional fluorescence bursts when in the suspension we added fluorescent proteins. The spectrum of these burst was devoid of the SHG and of the broad emission in contrast to the signal collected from the gold nanoparticles on the glass surface. Instead we found that the spectrum during the burst corresponded closely to the spectrum of the fluorescent protein. An additional control was obtained by measuring the cross-correlation between the reflection from the particles and the fluorescence arising from EGFP both excited at 488 nm. We found a very weak cross-correlation between the AuNPs and the fluorescence confirming that the burst originate from a few particles with a fluorescence signal.
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Affiliation(s)
- Andrea Anzalone
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California Irvine, Irvine, California, United States of America
| | - Manuela Gabriel
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California Irvine, Irvine, California, United States of America
| | - Laura C. Estrada
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California Irvine, Irvine, California, United States of America
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California Irvine, Irvine, California, United States of America
- Centre for Bioactive Discovery in Health and Ageing, School of Science & Technology, University of New England, Armidale, Australia
- * E-mail:
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5
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Joo HN, Seo YJ. A multiplex fluorophore molecular beacon: detection of the target sequence using large Stokes shift and multiple emission signal properties. Chem Commun (Camb) 2015; 51:2939-42. [DOI: 10.1039/c4cc08854a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed a multiplex fluorophore molecular beacon (mfMB) with fluorophores located at its end to produce unique FRET (Fluorescence Resonance Energy Transfer). It exhibited diverse fluorescence properties depending on the mixing pattern, such as large Stokes shift emission and multiple colors.
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Affiliation(s)
- Han Na Joo
- Department of Chemistry
- Chonbuk National University
- Jeonju 561-756
- South Korea
| | - Young Jun Seo
- Department of Chemistry
- Chonbuk National University
- Jeonju 561-756
- South Korea
- Department of Bioactive Material Sciences
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6
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Simoncelli S, Roberti MJ, Araoz B, Bossi ML, Aramendía PF. Mapping the Fluorescence Performance of a Photochromic–Fluorescent System Coupled with Gold Nanoparticles at the Single-Molecule–Single-Particle Level. J Am Chem Soc 2014; 136:6878-80. [DOI: 10.1021/ja5025657] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sabrina Simoncelli
- Centro de Investigaciones en Bionanociencias (CIBION-CONICET), Godoy Cruz 2390, 1425 Buenos Aires, Argentina
- Instituto de Química Física de Materiales, Ambiente y Energía, (INQUIMAE-CONICET), Pabellón
2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - M. Julia Roberti
- Centro de Investigaciones en Bionanociencias (CIBION-CONICET), Godoy Cruz 2390, 1425 Buenos Aires, Argentina
- Instituto de Química Física de Materiales, Ambiente y Energía, (INQUIMAE-CONICET), Pabellón
2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Beatriz Araoz
- Instituto de Química Física de Materiales, Ambiente y Energía, (INQUIMAE-CONICET), Pabellón
2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Mariano L. Bossi
- Instituto de Química Física de Materiales, Ambiente y Energía, (INQUIMAE-CONICET), Pabellón
2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Pedro F. Aramendía
- Centro de Investigaciones en Bionanociencias (CIBION-CONICET), Godoy Cruz 2390, 1425 Buenos Aires, Argentina
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
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7
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Sharma H, Digman MA, Felsinger N, Gratton E, Khine M. Enhanced emission of fluorophores on shrink-induced wrinkled composite structures. OPTICAL MATERIALS EXPRESS 2014; 4:753-763. [PMID: 25383253 PMCID: PMC4220269 DOI: 10.1364/ome.4.000753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We introduce a manufacturable and scalable method for creating tunable wrinkled ferromagnetic-metallic structures to enhance fluorescence signals. Thin layers of nickel (Ni) and gold (Au) were deposited onto a pre-stressed thermoplastic (shrink wrap film) polymer. Heating briefly forced the metal films to buckle when the thermoplastic retracted, resulting in multi-scale composite 'wrinkles'. This is the first demonstration of leveraging the plasmons in such hybrid nanostructures by metal enhanced fluorescence (MEF) in the near-infrared wavelengths. We observed more than three orders of magnitude enhancement in the fluorescence signal of a single molecule of goat anti-mouse immunoglobulin G (IgG) antibody conjugated to fluorescein isothiocyanate, FITC, (FITC-IgG) by two-photon excitation with these structures. These large enhancements in the fluorescence signal at the nanoscale gaps between the composite wrinkles corresponded to shortened lifetimes due to localized surface plasmons. To characterize these structures, we combined fluctuation correlation spectroscopy (FCS), fluorescence lifetime imaging microscopy (FLIM), and two-photon microscopy to spatially and temporally map the hot spots with high resolution.
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Affiliation(s)
- Himanshu Sharma
- Deparment of Chemical Engineering & Materials Science, University of California, Irvine, California 92697, USA
| | - Michelle A. Digman
- Department of Developmental and Cell Biology, Laboratory for Fluorescence Dynamics, University of California, Irvine, California 92697, USA
- Department of Biomedical Engineering, Laboratory for Fluorescence Dynamics, University of California, Irvine, California 92697, USA
| | - Natasha Felsinger
- Department of Biomedical Engineering, University of California, Irvine, California 92697, USA
| | - Enrico Gratton
- Department of Biomedical Engineering, Laboratory for Fluorescence Dynamics, University of California, Irvine, California 92697, USA
| | - Michelle Khine
- Deparment of Chemical Engineering & Materials Science, University of California, Irvine, California 92697, USA
- Department of Biomedical Engineering, University of California, Irvine, California 92697, USA
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8
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Ipiña EP, Dawson SP. From free to effective diffusion coefficients in fluorescence correlation spectroscopy experiments. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:022706. [PMID: 23496547 DOI: 10.1103/physreve.87.022706] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Indexed: 06/01/2023]
Abstract
Diffusion is one of the main transport processes that occur inside cells determining the spatial and time distribution of relevant action molecules. In most cases these molecules not only diffuse but also interact with others as they get transported. When these interactions occur faster than diffusion the resulting transport can be characterized by "effective diffusion coefficients" that depend on both the reaction rates and the "free" diffusion coefficients. Fluorescence correlation spectroscopy (FCS) gives information on effective rather than free diffusion coefficients under this condition. In the present paper we investigate what coefficients can be drawn from FCS experiments for a wide range of values of the ratio of reaction to diffusion time scales, using different fitting functions. We find that the effective coefficients can be inferred with relatively small errors even when the condition of fast reactions does not exactly hold. Since the diffusion time scale depends on the size of the observation volume and the reaction time scale depends on concentrations, we also discuss how by changing either one or the other property one can switch between the two limits and extract more information on the system under study.
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Affiliation(s)
- Emiliano Pérez Ipiña
- Departamento de Física, FCEN-UBA, and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, (1428) Buenos Aires, Argentina
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9
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Cui Q, He F, Wang X, Xia B, Li L. Gold nanoflower@gelatin core-shell nanoparticles loaded with conjugated polymer applied for cellular imaging. ACS APPLIED MATERIALS & INTERFACES 2013; 5:213-219. [PMID: 23237324 DOI: 10.1021/am302589g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In the present work, a facile one-pot method is designed to fabricate a core-shell fluorescent nanoparticle (NP) for cellular imaging based on a new cationic conjugated polymer, poly[9,9'-bis(6,6'-(N,N,N-trimethylaminium)fluorene-2,7-ylenevinylene-co-alt-2,5-dicyano-1,4-phenylene] (PFVCN). Gold nanoflowers (AuNFs) are prepared by a seedless method, in which a gelatin layer formed through a sol-gel phase transition is deposited on the surface of each AuNF. The cationic PFVCN self-assembles onto the negative surface of the resultant (AuNF@Gelatin NPs) driven by electrostatic attraction. An obvious enhancement of fluorescence intensity is observed. The AuNF@Gelatin/PFVCN NPs exhibit excellent cytocompatibility, and their cellular imaging ability is demonstrated when cocultured with HeLa cells. AuNF@Gelatin/PFVCN hybrid NPs are expected to be a desirable material in the field of cellular imaging and biosensing.
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Affiliation(s)
- Qianling Cui
- State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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