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Dhillon AK, Dudhe PE, Majumdar S, Barman S, Ghosh D, Dhanasekaran K, Siddhanta S. Imaging of intracellular protein aggregates through plasmon-assisted clusteroluminescence. NANOSCALE 2024; 16:11749-11761. [PMID: 38864278 DOI: 10.1039/d4nr01803f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
The formation of clusters in non-aromatic molecules can give rise to unconventional luminescence or clusteroluminescence. Typically containing heteroatoms without extended conjugation or aromatic rings, these molecules have drawn much attention owing to the prospects of label-free biological imaging. However, their applications have been limited due to the lack of knowledge of the underlying mechanism. Herein, we have elucidated the mechanism of clusteroluminescence from proteins, which were explicitly aggregated using plasmonic silver nanoparticles. The nanoparticles promoted protein aggregation and induced nitrile formation on the surface, which, along with other lone-pair-containing heteroatoms, contributed to enhanced emission in the visible range. Remarkably, this makes imaging of proteins possible with visible excitations, as co-factor-lacking proteins generally undergo electronic transitions only in the ultraviolet range. Furthermore, the inherent protein-aggregating behaviour of plasmonic nanoparticles was harnessed for imaging of intracellular Huntingtin protein aggregates overexpressed in HeLa cells through clusteroluminescence. Significant plasmon-enhanced and red-shifted fluorescence emission was observed, which helped in the imaging and localization of the intracellular aggregates. Density functional theory calculations and transient absorbance spectroscopy were used to probe the molecular interactions at the protein-nanoparticle interface and the charge transfer states, further elucidating the role of nanoparticles and the emission mechanism. This technique thus opens alternate avenues for label-free fluorescence bioimaging.
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Affiliation(s)
- Ashish Kumar Dhillon
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.
| | - Pranay Eknath Dudhe
- Centrosome and Cilia Laboratory, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurugram Expressway, Faridabad, Haryana (NCR Delhi) 121001, India.
| | - Shubhangi Majumdar
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.
| | - Sanmitra Barman
- Center for Advanced Materials and Devices (CAMD), BML Munjal University, Haryana, India
| | - Dibyajyoti Ghosh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.
| | - Karthigeyan Dhanasekaran
- Centrosome and Cilia Laboratory, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurugram Expressway, Faridabad, Haryana (NCR Delhi) 121001, India.
| | - Soumik Siddhanta
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.
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Semeniak D, Cruz DF, Chilkoti A, Mikkelsen MH. Plasmonic Fluorescence Enhancement in Diagnostics for Clinical Tests at Point-of-Care: A Review of Recent Technologies. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2107986. [PMID: 35332957 PMCID: PMC9986847 DOI: 10.1002/adma.202107986] [Citation(s) in RCA: 35] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 01/26/2022] [Indexed: 05/31/2023]
Abstract
Fluorescence-based biosensors have widely been used in the life-sciences and biomedical applications due to their low limit of detection and a diverse selection of fluorophores that enable simultaneous measurements of multiple biomarkers. Recent research effort has been made to implement fluorescent biosensors into the exploding field of point-of-care testing (POCT), which uses cost-effective strategies for rapid and affordable diagnostic testing. However, fluorescence-based assays often suffer from their feeble signal at low analyte concentrations, which often requires sophisticated, costly, and bulky instrumentation to maintain high detection sensitivity. Metal- and metal oxide-based nanostructures offer a simple solution to increase the output signal from fluorescent biosensors due to the generation of high field enhancements close to a metal or metal oxide surface, which has been shown to improve the excitation rate, quantum yield, photostability, and radiation pattern of fluorophores. This article provides an overview of existing biosensors that employ various strategies for fluorescence enhancement via nanostructures and have demonstrated the potential for use as POCT. Biosensors using nanostructures such as planar substrates, freestanding nanoparticles, and metal-dielectric-metal nanocavities are discussed with an emphasis placed on technologies that have shown promise towards POCT applications without the need for centralized laboratories.
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Affiliation(s)
- Daria Semeniak
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Daniela F. Cruz
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Ashutosh Chilkoti
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
| | - Maiken H. Mikkelsen
- Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA
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Heck JR, Miele E, Mouthaan RP, Frosz MH, Knowles TPJ, Euser TG. Label-free monitoring of proteins in optofluidic hollow-core photonic crystal fibres. Methods Appl Fluoresc 2022; 10. [PMID: 36084629 DOI: 10.1088/2050-6120/ac9113] [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: 06/30/2022] [Accepted: 09/09/2022] [Indexed: 11/11/2022]
Abstract
The fluorescent detection of proteins without labels or stains, which affect their behaviour and require additional genetic or chemical preparation, has broad applications to biological research. However, standard approaches require large sample volumes or analyse only a small fraction of the sample. Here we use optofluidic hollow-core photonic crystal fibres to detect and quantify sub-microlitre volumes of unmodified bovine serum albumin (BSA) protein down to 100 nM concentrations. The optofluidic fibre's waveguiding properties are optimised for guidance at the (auto)fluorescence emission wavelength, enabling fluorescence collection from a 10 cm long excitation region, increasing sensitivity. The observed spectra agree with spectra taken from a conventional cuvette-based fluorimeter, corrected for the guidance properties of the fibre. The BSA fluorescence depended linearly on BSA concentration, while only a small hysteresis effect was observed, suggesting limited biofouling of the fibre sensor. Finally, we briefly discuss how this method could be used to study aggregation kinetics. With small sample volumes, the ability to use unlabelled proteins, and continuous flow, the method will be of interest to a broad range of protein-related research.
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Affiliation(s)
- Jan Robert Heck
- Department of Physics, Cambridge University, JJ Thomson Ave, Cambridge, CB3 071, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Ermanno Miele
- Department of Physics, Cambridge University, JJ Thomson Ave, Cambridge, Cambridgeshire, CB2 1TN, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Ralf P Mouthaan
- Department of Physics, Cambridge University, JJ Thomson Ave, Cambridge, Cambridgeshire, CB2 1TN, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Michael H Frosz
- Max Planck Institute for the Science of Light, Max-Planck-Institut fuer die Physik des Lichts, Staudtstr. 2, Erlangen, 91058, GERMANY
| | - Tuomas P J Knowles
- Department of Physics, Cambridge University, JJ Thomson Ave, Cambridge, Cambridgeshire, CB2 1TN, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
| | - Tijmen G Euser
- Department of Physics, Cambridge University, JJ Thomson Ave, Cambridge, Cambridgeshire, CB2 1TN, UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
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Autofluorescence Imaging of Living Yeast Cells with Deep-Ultraviolet Surface Plasmon Resonance. PHOTONICS 2022. [DOI: 10.3390/photonics9060424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Autofluorescence in living cells on aluminum thin film was excited with deep-ultraviolet surface plasmon resonance (deep-UV SPR). Deep-UV SPR under aqueous medium was excited with Kretschmann configuration by using a sapphire prism. Deep-UV SPR is one of the promising techniques for high-sensitive autofluorescence imaging of living cells without staining. Label-free observation is significant for the structural analysis of living cells. We demonstrated the high-sensitive autofluorescence imaging of living yeast cells with deep-UV SPR. We applied a high refractive index prism, such as sapphire, which is suitable for the observation of specimens in aqueous medium, to excite deep-UV SPR. Although typical autofluorescence from living cells is buried in background noise, deep-UV SPR enhances the autofluorescence signal. The deep-UV SPR excitation of an aluminum thin film through a sapphire prism was investigated theoretically and experimentally. It showed that the fluorescence intensities are increased 2.8-fold. Deep-UV SPR enhanced the autofluorescence of cell structures, and yeast cells were found to be very sensitive. As a result, for water-immersed specimens, the sapphire-prism-based Kretschmann configuration excited SPR in deep-UV. Findings from this study suggest that deep-UV SPR can be considered an effective technique for attaining high-sensitivity observation of biological samples.
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Sultangaziyev A, Bukasov R. Review: Applications of surface-enhanced fluorescence (SEF) spectroscopy in bio-detection and biosensing. SENSING AND BIO-SENSING RESEARCH 2020; 30:100382. [PMID: 33101976 PMCID: PMC7566769 DOI: 10.1016/j.sbsr.2020.100382] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/09/2020] [Accepted: 10/14/2020] [Indexed: 12/05/2022] Open
Abstract
Surface-enhanced fluorescence (SEF) is rapidly becoming one of the main spectroscopic techniques for the detection of a variety of biomolecules and biomarkers. The main reasons for this trend are the high sensitivity and selectivity, robustness, and speed of this analytical method. Each year, the number of applications that utilize this phenomenon increases and with each such work, the complexity and novelty of the used substrates, procedures, and analytes rises. To obtain a clearer view of this phenomenon and research area, we decided to combine 76 valuable research articles from a variety of different research groups into this mini-review. We present and describe these works concisely and clearly, with a particular interest in the quantitative parameters of the experiment. These sources are classified according to the nature of the analyte, on the contrary to most reviews, which sort them by substrate nature. This point of view gives us insight into the development of this research area and the consequent increase in the complexity of the analyte nature. Moreover, this type of sorting can show possible future routes for the expansion of this research area. Along with the analytes, we can also pay attention to the substrates used for each situation and how the development of substrates affects the direction of research and subsequently, the choice of an analyte. About 108 sources and several interesting trends in the SEF research area over the past 25 years are discussed in this mini-review.
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Affiliation(s)
| | - Rostislav Bukasov
- Chemistry Department, SSH, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
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Petrik IS, Eremenko AM, Naumenko AP, Rudenko AV. Effect of silver and copper nanoparticles on adsorption and fluorescence of tryptophan on the surface of bactericidal textile. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01315-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Kumar A, Ahari D, Priyadarshi A, Ziauddin Ansari M, Swaminathan R. Weak Intrinsic Luminescence in Monomeric Proteins Arising from Charge Recombination. J Phys Chem B 2020; 124:2731-2746. [PMID: 32155070 DOI: 10.1021/acs.jpcb.9b10071] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We had earlier reported on the presence of broad UV-vis electronic absorption (250-800 nm) in a monomeric protein rich in charged but lacking aromatic amino acids, referred to as Protein Charge Transfer Spectra (ProCharTS). Specifically, it was shown that the cationic amino/anionic carboxylate head groups of Lys/Glu side chains act as electronic charge acceptors/donors for photoinduced electron transfer either from/to the polypeptide backbone or to each other. In this work, we show that such excitations produce weak intrinsic luminescence in proteins originating from charge recombination. We investigated aqueous solutions of proteins with varying abundance of charged amino acids, like human serum albumin (HuSA) and hen lysozyme, and intrinsically disordered proteins, like PEST fragment of human c-Myc protein, α-synuclein, and dehydrin. The absorbance and luminescence in all protein samples were a linear function of the concentration (0-50 μM) employed, confirming their origin from a monomeric species. The slope of the luminescence/[protein] plot directly correlated with the fraction of charged amino acids present in protein. Specifically, the higher slope in proteins like HuSA was chiefly accounted by a large molar extinction coefficient rather than quantum yield. This coefficient directly correlates with the population of charged side-chain head groups lying in close spatial proximity in the protein, contributed by the three-dimensional (3D) fold of the polypeptide. ProCharTS luminescence parameters appear conserved across proteins. These include overlapping excitation/emission spectra, large Stokes shifts (14 000-3000 cm-1) that decrease with increasing excitation wavelength, low quantum yields (0.002-0.026) indicating poor radiative recombination efficiency, and multiexponential decays (mean lifetimes = 0.4-2.9 ns).
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Affiliation(s)
- Amrendra Kumar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Dileep Ahari
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Anurag Priyadarshi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Mohd Ziauddin Ansari
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Rajaram Swaminathan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
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Schlüter F, Ravoo BJ, Rizzo F. Self-assembled multilayer surfaces of highly fluorescent spirobifluorene-based dye for label-free protein recognition. J Mater Chem B 2019; 7:4933-4939. [PMID: 31411615 DOI: 10.1039/c9tb00854c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The preparation of smart surfaces for protein detection is a challenging field of research. With the aim to achieve label-free detection in the solid state, we report on the organic surface functionalization for protein recognition without the need of previous chemical modification of the fluorophore. Layer-by-layer deposition of polyelectrolyte poly(vinyl benzyl tetramethylammonium) chloride (p(VBTMA)Cl) and a tetrasulfonate water-soluble low molecular weight fluorophore (1) based on spirobifluorene leads to modified glass and quartz substrates with outstanding photophysical properties in response to bovine serum albumin (BSA). The absorbance, photoluminescence as well as the fluorescence lifetimes were recorded for all surfaces. The surface structure and height of the different number of bilayers polymer/fluorophore were characterized by atomic force microscopy and ellipsometry. The results show linear trends in the absorption, fluorescence and height of the multilayer with increasing number of functionalization steps. Upon incubation with BSA the multilayer shows an increase in fluorescence up to 3-fold, which is also detectable with the naked eye. In conclusion, we report an easy, fast and biocompatible approach for the construction of protein sensors by self-assembly.
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Affiliation(s)
- Friederike Schlüter
- Organic Chemistry Institute, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149 Münster, Germany. and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Busso-Peus-Str. 10, 48149 Münster, Germany
| | - Bart Jan Ravoo
- Organic Chemistry Institute, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149 Münster, Germany. and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Busso-Peus-Str. 10, 48149 Münster, Germany
| | - Fabio Rizzo
- Organic Chemistry Institute, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, 48149 Münster, Germany. and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Busso-Peus-Str. 10, 48149 Münster, Germany and Institute of Molecular Science and Technologies (ISTM) and INSTM, National Research Council (CNR), via Golgi 19, 20133 Milano, Italy.
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9
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Fothergill SM, Joyce C, Xie F. Metal enhanced fluorescence biosensing: from ultra-violet towards second near-infrared window. NANOSCALE 2018; 10:20914-20929. [PMID: 30324956 DOI: 10.1039/c8nr06156d] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
To increase disease survival rates, there is a vital need for diagnosis at very preliminary stages. Then, low concentrations of biomarkers are present which must be effectively detected and quantified for reliable diagnosis. Fluorescent biosensing is commonly enabled through the labelling of these biomarkers with nanostructures and fluorophores. Metal Enhanced Fluorescence (MEF) is a phenomenon whereby the intensity of a fluorescent biosensor signal can be considerably enhanced by placing a metallic nanostructure and fluorophore in close proximity. Importantly, this allows for an even lower detection limit and thus earlier diagnosis. In recent years, extraordinary efforts have been made in the understanding of how the chemical and physical properties of nanomaterials may be exploited advantageously. Via precise nanoscale engineering, it is possible to optimize the optical properties of plasmonic nanomaterials, which now need to be refined and applied in diagnostics. Through MEF, the intensity of this signal can be related in direct proportion to analyte concentration, allowing for diagnosis of disease at an earlier stage than previously. This review paper outlines the potential and recent progress of applied MEF biosensors, highlighting their substantial clinical potential. MEF biosensors are presented both upon assay-based platforms and in solution, with comments on the various metallic nanoparticle morphologies available. This is explored across various emission wavelengths from ultra-violet to the second near infrared window (NIR-II), emphasising their wide applicability. Further to this, the importance of near infrared (NIR-I and NIR-II) biosensing is made clear as it allows for higher penetration in biological media. Finally, by developing multiplexing techniques, multiple and simultaneous analyses of analytes can be achieved. Through the incorporation of metal enhanced fluorescence into biosensing, it will be possible to diagnose disease more rapidly and more reliably than before, with the potential to save countless lives.
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Affiliation(s)
- Sarah Madeline Fothergill
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
| | - Caoimhe Joyce
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
| | - Fang Xie
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
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Khandel P, Shahi SK, Soni DK, Yadaw RK, Kanwar L. Alpinia calcarata: potential source for the fabrication of bioactive silver nanoparticles. NANO CONVERGENCE 2018; 5:37. [PMID: 30519797 PMCID: PMC6281549 DOI: 10.1186/s40580-018-0167-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 11/19/2018] [Indexed: 06/09/2023]
Abstract
In the present study silver nanoparticles fabricated by using leaf extract of Alpinia calcarata. We have also studied the effect of various experimental parameters viz., metal ion concentration, pH and incubation period on nanoparticle biosynthesis. Results of optimization showed that metal ion concentration of 1.5 mM, alkaline pH and incubation period of 12 h were the optimum conditions for metal nanoparticle biosynthesis. Synthesized silver nanoparticles were characterized by UV-Visible spectroscopy, Dynamic light scattering (DLS), Zeta potential analysis, Fourier transform infrared spectroscopy (FTIR), Inductively coupled plasma-optical emission spectrometry (ICP-OES), Transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). The UV-visible spectrum shows a sharp peak at 420 nm which was due to the surface plasmon resonance of the silver nanoparticles. Effect of several phytochemicals present in A. calcarata, on synthesis of silver nanoparticles was studied by Fourier transform infrared spectroscopy. The results indicate that the flavonoids, phytosterol, quinones and phenolic compounds present in the plant extract plays a major role in formation of silver nanoparticles in their respective ions in solution. Results of TEM and XRD analysis showed that synthesized silver nanoparticles were mostly spherical in shape with an average diameter of 27.2 ± 0.2.5 nm and highly crystalline in nature. Moreover the synthesized silver nanoparticles were also evaluated for their potential antibacterial and antioxidant activities. It showed good antibacterial activity as well as antioxidant activity. Thus the obtained result provides a scientific support that leaf extract of A. calcarata can be used efficiently in the production of potential bioactive silver nanoparticles with several pharmaceutical applications.
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Affiliation(s)
- Pramila Khandel
- Department of Botany, Bioresource Tech Laboratory, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh 495009 India
| | - Sushil Kumar Shahi
- Department of Botany, Bioresource Tech Laboratory, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh 495009 India
| | - Deepak Kumar Soni
- Department of Botany, Bioresource Tech Laboratory, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh 495009 India
| | - Ravi Kumar Yadaw
- Department of Botany, Bioresource Tech Laboratory, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh 495009 India
| | - Leeladhar Kanwar
- Department of Botany, Bioresource Tech Laboratory, Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh 495009 India
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Chiang YC, Huang CT, Wang WH, Chang CC. A dual photoluminescence enhancement system: stabilization of a water soluble AIEE fluorogen using silver nanowire. Faraday Discuss 2018; 196:55-69. [PMID: 27904898 DOI: 10.1039/c6fd00164e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
This manuscript describes the preparation of water soluble aggregation-induced emission enhancement (AIEE)-based fluorescent organic nanoparticles (FONs). The fluorescence diversity of the FONs was investigated in the presence of silver nanowires. We observed that the emission of the FONs can be enhanced by mixing with the nanowires, which is believed to originate from resonance between the emission of the FONs and the surface plasmon resonances of the metal surface. That is, the AIEE phenomenon was promoted according to the metal-enhanced fluorescence (MEF) mechanism that can be used to build up a novel double emission enhancement (DEE) platform and to extend the range of AIEE applications. The systemic fluorescence enhancement, lifetime and photostability were measured and the AIEE-MEF evaluation and the interaction between the FONs and nanowires were discussed based on the obtained spectral data and SEM and fluorescent microscopy images.
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Affiliation(s)
- Ying-Chen Chiang
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan
| | - Chun-Ta Huang
- ProTrusTech Co., Ltd, 3F.-1, No. 293, Sec. 3, Dongmen Rd. East District, Tainan City 701, Taiwan
| | - Wei Hsin Wang
- ProTrusTech Co., Ltd, 3F.-1, No. 293, Sec. 3, Dongmen Rd. East District, Tainan City 701, Taiwan
| | - Cheng-Chung Chang
- Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung 402, Taiwan.
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12
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Sasin ME, Smolin AG, Gericke KH, Tokunaga E, Vasyutinskii OS. Fluorescence anisotropy in indole under two-photon excitation in the spectral range 385-510 nm. Phys Chem Chem Phys 2018; 20:19922-19931. [PMID: 30020282 DOI: 10.1039/c8cp02708k] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper presents the detailed study of two-photon excited fluorescence in indole dissolved in propylene glycol produced by two-photon absorption from the molecular ground state to several high lying excited states. The experimental method involved excitation with linearly and circularly polarized femtosecond pulses and time-resolved detection of the polarized fluorescence decay. The fluorescence intensity, anisotropy, excited state lifetime, and rotation diffusion time as function of the excitation light wavelength in the spectral range 385-510 nm were determined in experiment. The theoretical fit of the experimental results obtained demonstrated the contributions of six highly excited molecular states of different symmetry to the two-photon absorption intensity and fluorescence anisotropy. An intense two-photon absorption peak was observed experimentally in the spectral range 385-480 nm and explained as contributions from four high lying electronic excited states. The temporal dependence of fluorescence intensity in indole was satisfactory characterized by a single excited state lifetime τf and a single rotational diffusion time τrot. As shown, the excited state lifetime τf depends on the excitation light wavelength, which was explained by taking into account nonradiative relaxation transitions in the molecular vibronic excited states. The rotation diffusion time τrot was found to be equal to τrot = 0.9 ± 0.5 ns and practically independent of the excitation wavelength. The determined molecular anisotropy changed substantially in the spectral area 385-480 nm taking positive and negative values, and the anisotropies referring to linearly and circularly polarized excitation light changed almost in opposite phases with each other. The experimental results obtained were interpreted using ab initio molecular structure computations and a model based on the Frank-Condon approximation and taking into account vibronic absorption bands.
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Affiliation(s)
- M E Sasin
- Ioffe Institute, Politekhnicheskaya 26, 194021 St.-Petersburg, Russia.
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Lopes-Bastos B, Jin L, Ruge F, Owen S, Sanders A, Cogle C, Chester J, Jiang WG, Cai J. Association of breast carcinoma growth with a non-canonical axis of IFNγ/IDO1/TSP1. Oncotarget 2017; 8:85024-85039. [PMID: 29156701 PMCID: PMC5689591 DOI: 10.18632/oncotarget.18781] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/29/2017] [Indexed: 01/21/2023] Open
Abstract
Reciprocal interactions between cancers and the surrounding microenvironment have an important role in tumour evolution. In this study, our data suggested that through thrombospondin 1 (TSP1), tumour-associated microvessel provides a dormant niche to sustain inactive status of breast invasive ductal carcinoma (IDC) cells. TSP1 levels in the tumour stroma were negatively correlated with vascular indoleamine 2,3-dioxygenase 1 (IDO1) in IDC tissues. IDO1 is an intracellular enzyme initiating the first and rate-limited step of tryptophan breakdown. Lower stromal TSP1 levels and positive tumour vascular IDO1 staining seems to associate with poor survive of patients with IDC. IDC cells induced a significantly increase in IDO1 expression in endothelial cells (ECs). IFNγ exerts a similar effect on ECs. We hypothesized a tryptophan starvation theory that since tryptophan is essential for the synthesis of TSP1, IDO1 induce a decrease in tryptophan availability and a reduction in TSP1 synthesis in ECs, leading to overcoming the dormancy state of IDC cells and exacerbating conditions such as tumour invasion and metastasis. These findings identify a non-canonical role of IFNγ/IDO1/TSP1 axis in microvascular niche-dominated dormancy of breast invasive ductal carcinoma with a solid foundation for further investigation of therapeutic and prognostic relevance.
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Affiliation(s)
- Bruno Lopes-Bastos
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Liang Jin
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Fiona Ruge
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Sioned Owen
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Andrew Sanders
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Christopher Cogle
- School of Medicine, University of Florida, Gainesville, Florida 32610-0278, USA
| | - John Chester
- Division of Cancer & Genetics, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Wen G Jiang
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Jun Cai
- Cardiff China Medical Research Collaborative, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
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14
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Synthesis of Fluorescent Core-Shell Metal Nanohybrids: A Versatile Approach. MATERIALS 2016; 9:ma9120997. [PMID: 28774118 PMCID: PMC5457000 DOI: 10.3390/ma9120997] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 11/15/2016] [Accepted: 12/05/2016] [Indexed: 11/24/2022]
Abstract
A flexible way of fabricating core-shell noble metal-organic nanohybrids with tailored chemical and spectroscopic properties is proposed here. The synthetic protocol consists of a multi-step procedure able to guarantee acceptable reproducibility of core size and shape as well as control of the organic outer layer. The proposed method highlights limitations in obtaining highly controllable products, although the heterogeneity degree of the nanostructures is in line with that expected from bottom-up approaches in solution. Selective functionalization of the nanohybrids with properly-substituted fluorescent dyes under variable experimental conditions allowed the preparation of composite systems of tunable spectroscopic properties to be employed as nanoprobes in sensing or photonic applications. To this end, preliminary investigation on embedding the nanohybrids in compatible polymeric matrices is also reported.
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15
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Poly(3-hexylthiophene)/gold nanoparticle nanocomposites: relationship between morphology and electrical conductivity. CHEMICAL PAPERS 2016. [DOI: 10.1007/s11696-016-0101-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Sui X, Li Q, Wang Z, Qi B, Zou X, Li Y, Jiang L. Does the hydrophobic group on sn-2 position of phosphatidylcholine decide its emulsifying ability? Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2016.07.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Song H, Chen C, Zhao S, Ge F, Liu D, Shi D, Zhang T. Interaction of gallic acid with trypsin analyzed by spectroscopy. J Food Drug Anal 2015; 23:234-242. [PMID: 28911378 PMCID: PMC9351775 DOI: 10.1016/j.jfda.2014.09.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 09/03/2014] [Accepted: 09/30/2014] [Indexed: 11/18/2022] Open
Abstract
The interactions between trypsin and gallic acid (GA) were investigated by means of fluorescence spectroscopy, UV-vis absorption spectroscopy, resonance light scattering (RLS) spectroscopy, synchronous fluorescence spectroscopy, and enzymatic inhibition assay. It was found that GA can cause the fluorescence quenching of trypsin during the process of formation of GA-trypsin complex, resulting in inhibition of trypsin activity (IC50 = 3.9 × 10−6 mol/L). The fluorescence spectroscopic data showed that the quenching efficiency can reach about 80%. The binding constants were 1.9371 × 104 L/mol, 1.8192 × 104 L/mol, and 1.7465 × 104 L/mol at three temperatures, respectively. The thermodynamic parameters revealed that hydrogen bonds, van der Waals, hydrophobic, and electrostatic interactions were involved in the binding process of GA to trypsin. Molecular modeling studies illustrated a specific display of binding information and explained most of the experiment phenomena. The microenvironments of tryptophan and tyrosine residue in trypsin were changed by the GA. Results indicated that GA was a strong quencher and inhibitor of trypsin.
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Affiliation(s)
- Hao Song
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
| | - Chaoyin Chen
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China.
| | - Shenglan Zhao
- Faculty of Traditional Chinese Medicine, Yunnan University of Traditional Chinese Medicine, Kunming 650200, People's Republic of China.
| | - Feng Ge
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
| | - Diqiu Liu
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
| | - Dandan Shi
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
| | - Tiancai Zhang
- Faculty of Life Science, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
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18
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Abel B, Coskun S, Mohammed M, Williams R, Unalan HE, Aslan K. Metal-Enhanced Fluorescence from Silver Nanowires with High Aspect Ratio on Glass Slides for Biosensing Applications. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2015; 119:675-684. [PMID: 25598859 PMCID: PMC4291037 DOI: 10.1021/jp509040f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Revised: 11/07/2014] [Indexed: 05/11/2023]
Abstract
High enhancement of fluorescence emission, improved fluorophore photostability, and significant reduction of fluorescence lifetimes have been obtained from high aspect ratio (>100) silver (Ag) nanowires. These quantities are found to depend on the surface loading of Ag nanowires on glass slides, where the enhancement of fluorescence emission increases with the density of nanowires. The surface loading dependence was attributed to the creation of intense electric fields around the network of Ag nanowires and to the coupling of fluorophore excited states that takes place efficiently at a distance of 10 nm from the surface of nanowires, which was confirmed by theoretical calculations. The enhancement of fluorescence emission of fluorescein isothiocyanate (FITC) was assessed by fluorescence spectroscopy and fluorescence-lifetime imaging microscopy (FLIM) to demonstrate the potential of high aspect ratio Ag nanowires. Fluorescence enhancement factors exceeding 14 were observed on Ag nanowires with high loading by FLIM. The photostability of FITC was the highest on nanowires with medium loading under continuous laser excitation for 10 min because of the significant reduction in the fluorescence lifetime of FITC on these surfaces. These results clearly demonstrate the potential of Ag nanowires in metal-enhanced fluorescence-based applications of biosensing on planar surfaces and cellular imaging.
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Affiliation(s)
- Biebele Abel
- Department
of Chemistry, Morgan State University, 1700 East Cold Spring Lane, Baltimore, Maryland 21251, United States
| | - Sahin Coskun
- Department
of Metallurgical and Materials Engineering, Middle East Technical University, Ankara 06800, Turkey
| | - Muzaffer Mohammed
- Department
of Chemistry, Morgan State University, 1700 East Cold Spring Lane, Baltimore, Maryland 21251, United States
| | - Richard Williams
- Department
of Chemistry, Morgan State University, 1700 East Cold Spring Lane, Baltimore, Maryland 21251, United States
| | - Husnu Emrah Unalan
- Department
of Metallurgical and Materials Engineering, Middle East Technical University, Ankara 06800, Turkey
| | - Kadir Aslan
- Department
of Chemistry, Morgan State University, 1700 East Cold Spring Lane, Baltimore, Maryland 21251, United States
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19
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Devi K, Sarma RJ. Exploring urea–fluoride interactions in the vicinity of a tryptophan residue. RSC Adv 2014. [DOI: 10.1039/c3ra46846a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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20
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On the Fluorescence of Luminol in a Silver Nanoparticles Complex. J Fluoresc 2013; 23:569-74. [DOI: 10.1007/s10895-013-1204-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 02/24/2013] [Indexed: 10/27/2022]
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21
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Fu Y, Zhang J, Lakowicz JR. Largely enhanced single-molecule fluorescence in plasmonic nanogaps formed by hybrid silver nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2731-8. [PMID: 23373787 PMCID: PMC3709438 DOI: 10.1021/la3048399] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
It has been suggested that narrow gaps between metallic nanostructures can be practical for producing large field enhancement. We design a hybrid silver nanostructure geometry in which fluorescent emitters are sandwiched between silver nanoparticles and silver island film (SIF). A desired number of polyelectrolyte layers are deposited on the SIF surface before the self-assembly of a second silver nanoparticle layer. Layer-by-layer configuration provides a well-defined dye position. It allows us to study the photophyical behaviors of fluorophores in the resulting gap at the single molecule level. The enhancement factor of a fluorophore located in the gap is much higher than those on silver surfaces alone and on glass. These effects may be used for increased detectability of single molecules bound to surfaces which contain metallic structures for either biophysical studies or high sensitivity assays.
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Affiliation(s)
- Yi Fu
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 W. Lombard Street, Baltimore, Maryland 21201, USA.
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22
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Magnan F, Gagnon J, Fontaine FG, Boudreau D. Indium@silica core–shell nanoparticles as plasmonic enhancers of molecular luminescence in the UV region. Chem Commun (Camb) 2013; 49:9299-301. [DOI: 10.1039/c3cc45276j] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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A close analysis of metal-enhanced fluorescence of tryptophan induced by silver nanoparticles: wavelength emission dependence. OPEN CHEM 2013. [DOI: 10.2478/s11532-012-0139-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractIn the last few years, silver nanoparticles have been proposed as a promising alternative for the label-free detection of proteins via metal-enhanced fluorescence. Generally, the aromatic amino acid tryptophan is most frequently used in this type of studies, because the intrinsic fluorescence of proteins is usually dominated by tryptophan emissions. In the present study, we evaluated the fluorescence behavior of tryptophan in the presence of a silver colloid with nanoparticles of 100 nm in diameter. The results showed that a nanoparticles concentration of 32 mg L−1 induced maximum fluorescence enhancement. However, the metal-enhanced fluorescence was dependent on the emission wavelength of tryptophan, and this phenomenon was closely related to the metal surface reabsorption process (inner filter effect), suggesting that the plasmon resonance reabsorption effect should be taken into account in analyses involving protein studies by metal-enhanced fluorescence.
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24
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He Q, Liang H, Lu J. A β-cyclodextrin-containing polymeric salicylidene Schiff base: synthesis, zinc ion coordination and fluorescence resonance energy transfer with protein. Polym Chem 2013. [DOI: 10.1039/c2py20832f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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25
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Jiao X, Blair S. Optical antenna design for fluorescence enhancement in the ultraviolet. OPTICS EXPRESS 2012; 20:29909-29922. [PMID: 23388817 DOI: 10.1364/oe.20.029909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Through rational design, we compare the performance of three plasmonic antenna structures for UV fluorescence enhancement. Among the antenna performance metrics considered are the local increase in excitation intensity and the increase in quantum efficiency, the product of which represents the net fluorescence enhancement. With realistic structures in aluminum, we predict that greater than 100× net enhancement can be obtained.
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Affiliation(s)
- Xiaojin Jiao
- Department of Electrical and Computer Engineering, University of Utah Salt Lake City, UT, 84112, USA
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26
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Li H, Chen CY, Wei X, Qiang W, Li Z, Cheng Q, Xu D. Highly sensitive detection of proteins based on metal-enhanced fluorescence with novel silver nanostructures. Anal Chem 2012; 84:8656-62. [PMID: 22992196 DOI: 10.1021/ac301787x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a highly sensitive metal enhanced fluorescence (MEF) method based on a novel silver nanostructure fabricated with Cy5-functionalized silver nanoparticles (AgNPs) and AgNO(3). The analytical performance has been demonstrated by microarray detection of streptavidin (SA) and human IgE. The fluorescence intensity can be enhanced substantially with the combined use of AgNPs and fluorescence enhanced solution (FES). Aptamers have been used for the preparation of Tag-C, which demonstrate IgE detection from 0.5 ng/mL to 16 ng/mL, and the limit of detection is determined to be 0.25 ng/mL. SEM images show nanogaps exist in the aggregated silver nanoparticles and the nanogaps allow for the trap of fluorophores in the nanostructures that emit brighter light upon excitation. The silver nanostructures formed by Tags and FES proved to be an excellent platform for MEF of fluorophores whose excitation and emission occurred between 436 nm and 1000 nm. Finite-difference time-domain (FDTD) simulation has been carried out to confirm the enhanced electromagnetic field inside silver nanostructures, leading to strong overlap/resonance coupling and eventual fluorescence enhancement.
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Affiliation(s)
- Hui Li
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, China
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27
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Akbay N, Lakowicz JR, Ray K. Distance-Dependent Metal-Enhanced Intrinsic Fluorescence of Proteins Using Polyelectrolyte Layer-by-Layer Assembly and Aluminum Nanoparticles. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2012; 116:10766-10773. [PMID: 22707997 PMCID: PMC3374651 DOI: 10.1021/jp2122714] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Previously reported studies indicate that aluminum nanostructured substrates can potentially find widespread use in metal-enhanced fluorescence (MEF) applications particularly in the UV or near-UV spectral region toward label-free detection of biomolecules. MEF largely depends on several factors, such as chemical nature, size, shape of the nanostructure and its distance from the fluorophore. A detailed understanding of the MEF and its distance-dependence are important for its potential application in biomedical sensing. Our goal is to utilize intrinsic protein fluorescence for label-free binding assays. This is made possible by the use of metallic nanostructures which provide localized excitation and enhanced fluorescence of UV fluorophores and will also provide a way to separate the surface-bound proteins from the bulk samples. We evaluated varied probe distances from plasmonic nanostructures by the well-established layer-by-layer (LbL) technique. The investigated proteins were adsorbed on different numbers of alternate layers of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) (PAH). Bovine serum albumin (BSA) was electrostatically attached to the positively charged PAH layer, and goat and rabbit IgG were attached to negatively charged PSS layer. We obtained a maximum of a ~ 9 fold increase in fluorescence intensity from BSA at a distance of ~9 nm from the Al nanostructured surface. Approximately 6- and 7- fold increases were observed from goat and rabbit IgG at a distance of ~8 nm, respectively. The minimum lifetimes were about 3-fold shorter than those on bare control quartz slides for all three proteins. The time-resolved intensity decays were analyzed with a lifetime distribution model to understand the distance effect on the metal-fluorophore interaction in detail. The present study indicates the distance dependence nature of metal-enhanced intrinsic fluorescence of proteins and potential of LbL assembly to control the metal-to-fluorophore distance in the UV wavelength region.
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Affiliation(s)
- Nuriye Akbay
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Krishanu Ray
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
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28
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Abstract
AbstractThe ability of metal surfaces and nanostructures to localize and enhance optical fields is the primary reason for their application in biosensing and imaging. Local field enhancement boosts the signal-to-noise ratio in measurements and provides the possibility of imaging with resolutions significantly better than the diffraction limit. In fluorescence imaging, local field enhancement leads to improved brightness of molecular emission and to higher detection sensitivity and better discrimination. We review the principles of plasmonic fluorescence enhancement and discuss applications ranging from biosensing to bioimaging.
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29
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Rezaei-Tavirani M, Tadayon R, Mortazavi SA, Medhet A, Namaki S, Kalantari S, Noshinfar E. Fluoxetine competes with cortisol for binding to human serum albumin. IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH : IJPR 2012; 11:325-30. [PMID: 24250455 PMCID: PMC3813104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Human serum albumin (HSA) is an important protein that carries variety of substances like some hormones and drugs in blood. Pharmacological studies of the interaction of many drugs and HSA are reported during several decades, specially recently years. Interaction of cortisol and fluoxetine hydrochloride (FLX) (as a common anti-stress drug) with HSA (as their carrier in blood) has been studied separately by using different spectroscopic techniques. Here, considering the increment of anti-stress drugs consumption, conformational change of HSA in presence of cortisol and FLX in 50 mM tris buffer, at pH = 7.5 and 37°C, is investigated via pH meter, UV absorption and fluorescence spectroscopy and circular dichroism methods. pH meter findings indicate that the acid denaturation of HSA in the presence of drug and cortisol occurs in the similar manner and this pattern is different relative to the denaturation of HSA in the absence of two reagents. The results of the other techniques consistent with the pH meter findings show that FLX effects on the physiochemical properties of HSA are as that of Cortisol. In-vivo study in Rats confirms in-vitro findings which means blood cortisol level increased in the presence of FLX. Experimental results indicate that FLX and cortisol alter the structural aspects of HSA in similar manner, so, this findings lead to the following reasonable conclusion: "FLX is a competitive ligand for the binding of cortisol to HSA. Binding of FLX to HSA interferes to the interaction of cortisol-HSA."
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Affiliation(s)
- Mostafa Rezaei-Tavirani
- Islamic Azad University, Science and Research branch, Tehran, Iran.,Corresponding author: E-mail:
| | - Roya Tadayon
- Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran Iran.
| | - Seyyed Alireza Mortazavi
- Department of Pharmaceutics, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Arvin Medhet
- Proteomics Research Center, Shahid Beheshti University of Medical Sciences, Tehran Iran.
| | - Said Namaki
- Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran Iran
| | - Shiva Kalantari
- Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran Iran
| | - Ellaheh Noshinfar
- Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran Iran
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30
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Zong W, Cao S, Xu Q, Liu R. The use of outer filter effects for Cu2+ quantitation: a unique example for monitoring nonfluorescent molecule with fluorescence. LUMINESCENCE 2011; 27:292-6. [DOI: 10.1002/bio.1349] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2011] [Revised: 07/14/2011] [Accepted: 07/18/2011] [Indexed: 11/07/2022]
Affiliation(s)
| | - Shutao Cao
- Yinan Environmental Protection Bureau; Shandong; PR China
| | - Qifei Xu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse; School of Environmental Science and Engineering, Shandong University; PR China America CRC for Environment and Health; Shandong Province; Jinan; PR China
| | - Rutao Liu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse; School of Environmental Science and Engineering, Shandong University; PR China America CRC for Environment and Health; Shandong Province; Jinan; PR China
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31
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Huang GG, Cheng ML, Yang J. Metal Ion-Assisted Infrared Optical Sensor for Selective Determination of Tryptophan in Urine Samples. J CHIN CHEM SOC-TAIP 2011. [DOI: 10.1002/jccs.201190003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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32
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Chowdhury MH, Chakraborty S, Lakowicz JR, Ray K. Feasibility of Using Bimetallic Plasmonic Nanostructures to Enhance the Intrinsic Emission of Biomolecules. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2011; 115:16879-16891. [PMID: 21984954 PMCID: PMC3185356 DOI: 10.1021/jp205108s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Detection of the intrinsic fluorescence from proteins is important in bio-assays because it can potentially eliminate the labeling of external fluorophores to proteins. This is advantageous because using external fluorescent labels to tag biomolecules requires chemical modification and additional incubation and washing steps which can potentially perturb the native functionality of the biomolecules. Hence the external labeling steps add expense and complexity to bio-assays. In this paper, we investigate for the first time the feasibility of using bimetallic nanostructures made of silver (Ag) and aluminum (Al) to implement the metal enhanced fluorescence (MEF) phenomenon for enhancing the intrinsic emission of biomolecules in the ultra-violet (UV) spectral region. Fluorescence intensities and lifetimes of a tryptophan analogue N-acetyl-L-tryptophanamide (NATA) and a tyrosine analogue N-acetyl-L-tyrosinamide (NATA-tyr) were measured. Increase in fluorescence intensities of upto 10-fold and concurrent decrease in lifetimes for the amino acids were recorded in the presence of the bimetallic nanostructures when compared to quartz controls. We performed a model protein assay involving biotinylated bovine serum albumin (bt-BSA) and streptavidin on the bimetallic nanostructured substrate to investigate the distance dependent effects on the extent of MEF from the bimetallic nanostructures and found a maximum enhancement of over 15-fold for two layers of bt-BSA and streptavidin. We also used finite difference time domain (FDTD) calculations to explore how bimetallic nanostructures interact with plane waves and excited state fluorophores in the UV region and demonstrate that the bimetallic substrates are an effective platform for enhancing the intrinsic emission of proteins and other biomolecules.
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Affiliation(s)
| | | | | | - Krishanu Ray
- Corresponding author: , Phone: 1-410-706-7500; Fax: 1-410-706-8408
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33
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Mahato M, Pal P, Tah B, Ghosh M, Talapatra GB. Study of silver nanoparticle-hemoglobin interaction and composite formation. Colloids Surf B Biointerfaces 2011; 88:141-9. [PMID: 21788120 DOI: 10.1016/j.colsurfb.2011.06.024] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 06/20/2011] [Accepted: 06/20/2011] [Indexed: 10/18/2022]
Abstract
Nanoscience is now an expanding field of research and finds potential application in biomedical area, but it is limited due to lack of comprehensive knowledge of the interactions operating in nano-bio system. Here, we report the studies on the interaction and formation of nano-bio complex between silver nanoparticle (AgNP) and human blood protein hemoglobin (Hb). We have employed several spectroscopic (absorption, emission, Raman, FTIR, CD, etc.) and electron diffraction techniques (FE-SEM and HR-TEM) to characterize the Hb-AgNP complex system. Our results show the Hb-AgNP interaction is concentration and time dependent. The AgNP particle can attach/come closer to heme, tryptophan, and amide as well aromatic amine residues. As a result, the Hb undergoes conformational change and becomes unfolded through the increment of β-sheet structure. The AgNP-Hb can form charge-transfers (CT) complex where the Hb-heme along with the AgNP involved in the electron transfer mechanism and form Hb-AgNP assembled structure. The electron transfer mechanism has been found to be dependent on the size of silver particle. The overall study is important in understanding the nano-bio system and in predicting the avenues to design and synthesis of novel nano-biocomposite materials in material science and biomedical area.
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Affiliation(s)
- Mrityunjoy Mahato
- Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
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Fu Y, Zhang J, Lakowicz JR. Metallic-Nanostructure-Enhanced Fluorescence of Single Flavin Cofactor and Single Flavoenzyme Molecules. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2011; 115:7202-7208. [PMID: 21552478 PMCID: PMC3087598 DOI: 10.1021/jp109617h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The enzyme cofactors are intrinsically fluorescent and participate directly in the single molecule enzymology studies. Due to photobleaching, one cannot follow kinetics continuously by cofactor fluorescence for more than several minutes typically. Modification of spectral properties of fluorophores, such as the amplification of emission intensity, can be achieved through coupling with surface plasmons in close proximity to metallic nanostructures. This process, referred to as metal-enhanced fluorescence, offers promise for a range of applications, including bioassays, sensor technology, microarrays, and single-molecule studies. Here, we demonstrated up to a 100-fold increase in the emission of the single cofactors and flavoenzymes near silver nanostructures. Amplified fluorescence of different types of flavins and flavoenzymes has been interpreted by using time-resolved single molecule fluorescence data. The results show considerable promise for the studies of enzyme kinetics using the intrinsic fluorescence from the cofactors.
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Affiliation(s)
- Yi Fu
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Jian Zhang
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, Maryland 21201, United States
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35
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Kim J, Dantelle G, Revaux A, Bérard M, Huignard A, Gacoin T, Boilot JP. Plasmon-induced modification of fluorescent thin film emission nearby gold nanoparticle monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8842-8849. [PMID: 20230040 DOI: 10.1021/la904612r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
When placed in the vicinity of metal nanoparticles, fluorophore molecules can have their fluorescence intensity enhanced. In order to engineer highly fluorescent thin films, surface plasmon enhancement fluorescence was studied on macroscopic systems composed of gold nanoparticles deposited on a substrate and coated by a dye-containing polymer film. We developed a simple method based on surface silanization to get a good dispersion of up to 100 nm gold nanoparticles on a substrate. While controlling the nanoparticle size and the fluorophore concentration, we measured the fluorescence enhancement factors of systems doped with dyes possessing different quantum yields. We evidenced experimentally that a fluorescence enhancement factor of 4 could be reached for a low-quantum yield dye and that the fluorophore quantum yield affects significantly the enhancement factor. We then discussed how our experimental results agree with previously developed models.
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Affiliation(s)
- Jongwook Kim
- Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique-CNRS, 91128 Palaiseau, France.
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36
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Yang B, Lu N, Qi D, Ma R, Wu Q, Hao J, Liu X, Mu Y, Reboud V, Kehagias N, Torres CMS, Boey FYC, Chen X, Chi L. Tuning the intensity of metal-enhanced fluorescence by engineering silver nanoparticle arrays. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:1038-43. [PMID: 20394069 DOI: 10.1002/smll.200902350] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
It is demonstrated that silver nanoparticle (SNP) arrays fabricated by combining nanoimprint lithography and electrochemical deposition methods can be used as substrates for metal-enhanced fluorescence, which is widely used in optics, sensitive detection, and bioimaging. The method presented here is simple and efficient at controlling the nanoparticle density and interparticle distance within one array. Furthermore, it is found that the fluorescence intensity can be tuned by engineering the feature size of the SNP arrays. This is due to the different coupling efficiency between the emission of the fluorophores and surface plasmon resonance band of the metallic nanostructures.
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Affiliation(s)
- Bingjie Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China
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Krishnamoorthy G, Carlen ET, deBoer HL, van den Berg A, Schasfoort RBM. Electrokinetic Lab-on-a-BioChip for Multi-ligand/Multi-analyte Biosensing. Anal Chem 2010; 82:4145-50. [DOI: 10.1021/ac1003163] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ganeshram Krishnamoorthy
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Edwin T. Carlen
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Hans L. deBoer
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Albert van den Berg
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Richard B. M. Schasfoort
- BIOS Lab-on-a-Chip Group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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