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Bruna N, Galliani E, Oyarzún P, Bravo D, Fuentes F, Pérez-Donoso JM. Biomineralization of lithium nanoparticles by Li-resistant Pseudomonas rodhesiae isolated from the Atacama salt flat. Biol Res 2022; 55:12. [PMID: 35296351 PMCID: PMC8925236 DOI: 10.1186/s40659-022-00382-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 03/01/2022] [Indexed: 11/23/2022] Open
Abstract
Background The Atacama salt flat is located in northern Chile, at 2300 m above sea level, and has a high concentration of lithium, being one of the main extraction sites in the world. The effect of lithium on microorganism communities inhabiting environments with high concentrations of this metal has been scarcely studied. A few works have studied the microorganisms present in lithium-rich salt flats (Uyuni and Hombre Muerto in Bolivia and Argentina, respectively). Nanocrystals formation through biological mineralization has been described as an alternative for microorganisms living in metal-rich environments to cope with metal ions. However, bacterial lithium biomineralization of lithium nanostructures has not been published to date. In the present work, we studied lithium-rich soils of the Atacama salt flat and reported for the first time the biological synthesis of Li nanoparticles. Results Bacterial communities were evaluated and a high abundance of Cellulomonas, Arcticibacter, Mucilaginibacter, and Pseudomonas were determined. Three lithium resistant strains corresponding to Pseudomonas rodhesiae, Planomicrobium koreense, and Pseudomonas sp. were isolated (MIC > 700 mM). High levels of S2− were detected in the headspace of P. rodhesiae and Pseudomonas sp. cultures exposed to cysteine. Accordingly, biomineralization of lithium sulfide-containing nanomaterials was determined in P. rodhesiae exposed to lithium salts and cysteine. Transmission electron microscopy (TEM) analysis of ultrathin sections of P. rodhesiae cells biomineralizing lithium revealed the presence of nanometric materials. Lithium sulfide-containing nanomaterials were purified, and their size and shape determined by dynamic light scattering and TEM. Spherical nanoparticles with an average size < 40 nm and a hydrodynamic size ~ 44.62 nm were determined. Conclusions We characterized the bacterial communities inhabiting Li-rich extreme environments and reported for the first time the biomineralization of Li-containing nanomaterials by Li-resistant bacteria. The biosynthesis method described in this report could be used to recover lithium from waste batteries and thus provide a solution to the accumulation of batteries. Supplementary Information The online version contains supplementary material available at 10.1186/s40659-022-00382-6.
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Affiliation(s)
- N Bruna
- BioNanotechnology and Microbiology Laboratory, Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias de la Vida, Av. República # 330, Santiago, Chile
| | - E Galliani
- BioNanotechnology and Microbiology Laboratory, Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias de la Vida, Av. República # 330, Santiago, Chile
| | - P Oyarzún
- Laboratorio de Análisis de Sólidos, Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andrés Bello, Santiago, Chile
| | - D Bravo
- Laboratorio de Microbiología Oral, Facultad de Odontología, Universidad de Chile, Santiago, Chile
| | - F Fuentes
- Escuela de Geología, Facultad de Ciencias, Universidad Mayor, Av. Manuel Montt 367, Santiago, Chile
| | - J M Pérez-Donoso
- BioNanotechnology and Microbiology Laboratory, Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias de la Vida, Av. República # 330, Santiago, Chile.
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Quantitative Determination of the Surface Distribution of Supported Metal Nanoparticles: A Laser Ablation–ICP–MS Based Approach. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9040077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) based method is proposed for the quantitative determination of the spatial distribution of metal nanoparticles (NPs) supported on planar substrates. The surface is sampled using tailored ablation patterns and the data are used to define three-dimensional functions describing the spatial distribution of NPs. The volume integrals of such interpolated surfaces are calibrated to obtain the mass distribution of Ag NPs by correlation with the total mass of metal as determined by metal extraction and ICP–MS analysis. Once this mass calibration is carried out on a sacrificial sample, quantifications can be performed over multiple samples by a simple micro-destructive LA–ICP–MS analysis without requiring the extraction/dissolution of metal NPs. The proposed approach is here tested using a model sample consisting of a low-density polyethylene (LDPE) disk decorated with silver NPs, achieving high spatial resolution over cm2-sized samples and very high sensitivity. The developed method is accordingly a useful analytical tool for applications requiring both the total mass and the spatial distribution of metal NPs to be determined without damaging the sample surface (e.g., composite functional materials and NPs, decorated catalysts or electrodic materials).
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Sang Y, Han J, Zhao T, Duan P, Liu M. Circularly Polarized Luminescence in Nanoassemblies: Generation, Amplification, and Application. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1900110. [PMID: 31394014 DOI: 10.1002/adma.201900110] [Citation(s) in RCA: 423] [Impact Index Per Article: 105.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 05/13/2019] [Indexed: 05/22/2023]
Abstract
Currently, the development of circularly polarized luminescent (CPL) materials has drawn extensive attention due to the numerous potential applications in optical data storage, displays, backlights in 3D displays, and so on. While the fabrication of CPL-active materials generally requires chiral luminescent molecules, the introduction of the "self-assembly" concept offers a new perspective in obtaining the CPL-active materials. Following this approach, various self-assembled materials, including organic-, inorganic-, and hybrid systems can be endowed with CPL properties. Benefiting from the advantages of self-assembly, not only chiral molecules, but also achiral species, as well as inorganic nanoparticles have potential to be self-assembled into chiral nanoassemblies showing CPL activity. In addition, the dissymmetry factor, an important parameter of CPL materials, can be enhanced through various pathways of self-assembly. Here, the present status and progress of self-assembled nanomaterials with CPL activity are reviewed. An overview of the key factors in regulating chiral emission materials at the supramolecular level will largely boost their application in multidisciplinary fields.
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Affiliation(s)
- Yutao Sang
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2 ZhongGuanCun BeiYiJie, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jianlei Han
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Division of Nanophotonics, National Center for Nanoscience and Technology (NCNST), No. 11 ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China
| | - Tonghan Zhao
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Division of Nanophotonics, National Center for Nanoscience and Technology (NCNST), No. 11 ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China
| | - Pengfei Duan
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Division of Nanophotonics, National Center for Nanoscience and Technology (NCNST), No. 11 ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, No. 2 ZhongGuanCun BeiYiJie, Beijing, 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Division of Nanophotonics, National Center for Nanoscience and Technology (NCNST), No. 11 ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China
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Kareem MA, Bello IT, Shittu HA, Awodele MK, Adedokun O, Sanusi YK. Green synthesis of silver nanoparticles (AgNPs) for optical and photocatalytic applications: a review. ACTA ACUST UNITED AC 2020. [DOI: 10.1088/1757-899x/805/1/012020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Singh R, Mishra NK, Gupta P, Joshi KB. Self-assembly of a Sequence-shuffled Short Peptide Amphiphile Triggered by Metal Ions into Terraced Nanodome-like Structures. Chem Asian J 2020; 15:531-539. [PMID: 31899579 DOI: 10.1002/asia.201901715] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Indexed: 01/13/2023]
Abstract
We highlight the structural diversity of strategically designed two short peptide amphiphiles (sPAs) and describe their structure-function relationship studies. The shuffling of two key amino acids, that is, tyrosine and phenylalanine, in a designed sPA lead to a pair of constitutional isomers. Such small and strategic alteration can bring a substantial change in the self-assembling pattern. Inspired from the naturally occurring metallopeptides, bioactive transition-metal ions were used for constructing the unusual nanostructures. Use of appropriate metal ions created bigger differences between the properties of these isomers and hence the self-assembly. Coordination of appropriate transition metal ions modifies the internal nanoscale structures of sPA, thus leading to the formation of vertically stacked terraced layers with decreasing size, which possess a high degree of dimensional regularity. We propose that such metal-induced terraced nanodome-like hierarchical self-assembly may have relevance for specific biotechnology applications.
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Affiliation(s)
- Ramesh Singh
- Department of Chemistry, School of Chemical Science and Technology, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
| | - Narendra Kumar Mishra
- Indian Institute of Technology, Kanpur, 208016, India.,Department of Chemistry, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark
| | - Puneet Gupta
- Department of Chemistry, Indian Institute of Technology, Roorkee, 247667, India
| | - Khashti Ballabh Joshi
- Department of Chemistry, School of Chemical Science and Technology, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
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Ma Y, Li Y, Huang C, Tian Y, Hao Z. RETRACTED ARTICLE: Rhamnolipid biosurfactants: functional properties and potential contributions for bioremediation. Biodegradation 2019; 30:363. [PMID: 30357536 DOI: 10.1007/s10532-018-9862-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 10/17/2018] [Indexed: 10/28/2022]
Affiliation(s)
- Yanling Ma
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China.
| | - Yanpeng Li
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Chao Huang
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Yuexin Tian
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
| | - Zhidan Hao
- Shaanxi Provincial Key Laboratory of Biotechnology, Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, 229 Taibai North Rd, Xi'an, 710069, Shaanxi, China
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Pang JS, Theodorou IG, Centeno A, Petrov PK, Alford NM, Ryan MP, Xie F. Tunable Three-Dimensional Plasmonic Arrays for Large Near-Infrared Fluorescence Enhancement. ACS APPLIED MATERIALS & INTERFACES 2019; 11:23083-23092. [PMID: 31252484 DOI: 10.1021/acsami.9b08802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal-enhanced fluorescence (MEF), resulting from the near-field interaction of fluorophores with metallic nanostructures, has emerged as a powerful tool for dramatically improving the performance of fluorescence-based biomedical applications. Allowing for lower autofluorescence and minimal photoinduced damage, the development of multifunctional and multiplexed MEF platforms in the near-infrared (NIR) windows is particularly desirable. Here, a low-cost fabrication method based on nanosphere lithography is applied to produce tunable three-dimensional (3D) gold (Au) nanohole-disc arrays (Au-NHDAs). The arrays consist of nanoscale glass pillars atop nanoholes in a Au thin film: the top surfaces of the pillars are Au-covered (effectively nanodiscs), and small Au nanoparticles (nanodots) are located on the sidewalls of the pillars. This 3D hole-disc (and possibly nanodot) construct is critical to the properties of the device. The versatility of our approach is illustrated through the production of uniform and highly reproducible Au-NHDAs with controlled structural properties and tunable optical features in the NIR windows. Au-NHDAs allow for a very large NIR fluorescence enhancement (more than 400 times), which is attributed to the 3D plasmonic structure of the arrays that allows strong surface plasmon polariton and localized surface plasmon resonance coupling through glass nanogaps. By considering arrays with the same resonance peak and the same nanodisc separation distance, we show that the enhancement factor varies with nanodisc diameter. Using computational electromagnetic modeling, the electric field enhancement at 790 nm was calculated to provide insights into excitation enhancement, which occurs due to an increase in the intensity of the electric field. Fluorescence lifetime measurements indicate that the total fluorescence enhancement may depend on controlling excitation enhancement and therefore the array morphology. Our findings provide important insights into the mechanism of MEF from 3D plasmonic arrays and establish a low-cost versatile approach that could pave the way for novel NIR-MEF bioapplications.
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Affiliation(s)
- Jing S Pang
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
| | - Ioannis G Theodorou
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering , University of Cyprus , 40 Macedonias Avenue , Latsia 2238 , Cyprus
| | - Anthony Centeno
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
- Department of Electrical and Electronic Engineering , Xi'an Jiaotong Liverpool University , 111 Ren'ai Road , Suzhou Dushu Lake Higher Education Town , Jiangsu 215123 , China
| | - Peter K Petrov
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
| | - Neil M Alford
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
| | - Mary P Ryan
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
| | - Fang Xie
- Department of Materials and London Centre for Nanotechnology , Imperial College London , SW7 2AZ , London , U.K
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Tran NHT, Trinh KTL, Lee JH, Yoon WJ, Ju H. Fluorescence Enhancement Using Bimetal Surface Plasmon-Coupled Emission from 5-Carboxyfluorescein (FAM). MICROMACHINES 2018; 9:E460. [PMID: 30424393 PMCID: PMC6187710 DOI: 10.3390/mi9090460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 09/06/2018] [Accepted: 09/10/2018] [Indexed: 02/01/2023]
Abstract
We demonstrate the enhancement of fluorescence emission from a dye, 5-carboxyfluorescein (FAM), which couples with surface plasmons at the spectral channels of excitation and emission. Experiments and calculations revealed that bimetallic (gold-silver) plasmon, as compared to the monometallic ones, allowed such coupling to be enhanced, at both the spectral channels. We achieved the maximum fluorescence enhancement level of 46.5-fold, with markedly high reproducibility (coefficient of variation ~ 0.5%) at a FAM concentration of 10 nM. We also found that higher fluorescence enhancement was more likely to be reproducible. This encourages the use of this technology for practical applications in fluorescence-based biochemical assays. Moreover, we investigated a FAM concentration-dependent enhancement of fluorescence. It was found that fluorescence enhancement decreased and saturated at above 10 nM concentration possibly due to partial photo-bleaching of FAM molecules.
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Affiliation(s)
- Nhu Hoa Thi Tran
- Department of Nano-Physics, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
- Gachon Bionano Research Institute, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
| | - Kieu The Loan Trinh
- Department of BioNano Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
| | - Jun-Ho Lee
- Laser & Opto-electronics Team, Korea Electronics Technology Institute, Seongnam-si, Gyeonggi-do 13509, Korea.
| | - Won Jung Yoon
- Department of Chemical and Bio Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
| | - Heongkyu Ju
- Department of Nano-Physics, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
- Gachon Bionano Research Institute, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Korea.
- Neuroscience Institute, Gil Hospital, Incheon 405-760, Korea.
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Tran NHT, Trinh KTL, Lee JH, Yoon WJ, Ju H. Reproducible Enhancement of Fluorescence by Bimetal Mediated Surface Plasmon Coupled Emission for Highly Sensitive Quantitative Diagnosis of Double-Stranded DNA. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801385. [PMID: 30003662 DOI: 10.1002/smll.201801385] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 06/05/2018] [Indexed: 05/27/2023]
Abstract
Plasmonic enhancement of fluorescence from SYBR Green I conjugated with a double-stranded DNA (dsDNA) amplicon is demonstrated on polymerase chain reaction (PCR) products. Theoretical computation leads to use of the bimetallic (Au 2 nm-Ag 50 nm) surface plasmons due to larger local fields (higher quality factors) than monometallic (Ag or Au) ones at both dye excitation and emission wavelengths simultaneously, optimizing fluorescence enhancement with surface plasmon coupled emission (SPCE). Two kinds of reverse Kretschmann configurations are used, which favor, in signal-to-noise ratio, a fluorescence assay that uses optically dense buffer such as blood plasma. The fluorescence enhancement (12.9 fold at maximum) with remarkably high reproducibility (coefficient of variation (CV) < 1%) is experimentally demonstrated. This facilitates credible quantitation of enhanced fluorescence, however unlikely to obtain by localized surface plasmons. The plasmon-induced optical gain of 46 dB due to SPCE-active dye molecules is also estimated. The fluorescence enhancement technologies with PCR enables LOD of the dsDNA template concentration of ≈400 fg µL-1 (CV < 1%), the lowest ever reported in DNA fluorescence assay to date. SPCE also reduces photobleaching significantly. These technologies can be extended for a highly reproducible and sufficiently sensitive fluorescence assay with small volumes of analytes in multiplexed diagnostics.
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Affiliation(s)
- Nhu Hoa Thi Tran
- Department of Nano-Physics, Gachon University, Seongnam, 13120, Republic of Korea
- Gachon Bionano Research Institute, Gachon University, Seongnam, 13120, Republic of Korea
| | - Kieu The Loan Trinh
- Department of BioNano Technology, Gachon University, Seongnam, 13120, Republic of Korea
| | - Jun-Ho Lee
- Department of Nano-Physics, Gachon University, Seongnam, 13120, Republic of Korea
- Laser & Opto-electronics Team, Korea Electronics Technology Institute (KETI), Seongnam, 13509, Republic of Korea
| | - Won Jung Yoon
- Department of Chemical and BioEngineering, Gachon University, Seongnam, 13120, Republic of Korea
| | - Heongkyu Ju
- Department of Nano-Physics, Gachon University, Seongnam, 13120, Republic of Korea
- Gachon Bionano Research Institute, Gachon University, Seongnam, 13120, Republic of Korea
- Neuroscience Institute, Gil Hospital, Incheon, 405-760, Republic of Korea
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Qu Z, Duan P, Zhou J, Wang Y, Liu M. Photon upconversion in organic nanoparticles and subsequent amplification by plasmonic silver nanowires. NANOSCALE 2018; 10:985-991. [PMID: 29265124 DOI: 10.1039/c7nr07340b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The development of photonic materials with high photoluminescence is always a challenge in photochemistry and photophysics. Here we present a general approach for enhancing photon upconversion through aggregation and further via surface plasmon resonance (SPR). Luminescent nanoparticles from a tetraphenylethylene derivative were fabricated, showing excellent aggregation-induced emission (AIE) behavior. By mixing with a triplet sensitizer platinum octaethylporphyrin (PtOEP), aggregation-induced photon upconversion (iPUC) could be achieved, resulting in an enhancement of the emission. Blending such iPUC nanoparticles with silver nanowires (AgNWs), the upconverted emission intensity could be significantly amplified due to the SPR of AgNWs. Thus, the concepts of aggregation-induced emission (AIE), metal enhanced fluorescence (MEF) and aggregation-induced photon upconversion (iPUC) were successfully integrated and achieved.
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Affiliation(s)
- Zuoming Qu
- College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application of the Ministry of Education, Xiangtan University, Xiangtan 411105, P.R. China
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Lei Z, Zhang H, Wang Y, Meng X, Wang Z. Peptide Microarray-Based Metal Enhanced Fluorescence Assay for Multiple Profiling of Matrix Metalloproteinases Activities. Anal Chem 2017; 89:6749-6757. [DOI: 10.1021/acs.analchem.7b01037] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Zhen Lei
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hua Zhang
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
| | - Yaoqi Wang
- Department
of Thyroid Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P. R. China
| | - Xianying Meng
- Department
of Thyroid Surgery, The First Hospital of Jilin University, Changchun, Jilin 130021, P. R. China
| | - Zhenxin Wang
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China
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Theodorou IG, Jawad ZAR, Qin H, Aboagye EO, Porter AE, Ryan MP, Xie F. Significant metal enhanced fluorescence of Ag2S quantum dots in the second near-infrared window. NANOSCALE 2016; 8:12869-73. [PMID: 27314986 DOI: 10.1039/c6nr03220f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The amplification of light in NIR-II from Ag2S QDs via metal enhanced fluorescence (MEF) is reported for the first time. Significant fluorescence enhancement of over 100 times for Ag2S QDs deposited on Au-nanostructured arrays, paves the way for novel sensing and imaging applications based on Ag2S QDs, with improved detection sensitivity and contrast enhancement.
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Affiliation(s)
- I G Theodorou
- Department of Materials and London Centre for Nanotechnology, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
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Miranda ÉGA, Tofanello A, Brito AMM, Lopes DM, Albuquerque LJC, de Castro CE, Costa FN, Giacomelli FC, Ferreira FF, Araújo-Chaves JC, Nantes IL. Effects of Gold Salt Speciation and Structure of Human and Bovine Serum Albumins on the Synthesis and Stability of Gold Nanostructures. Front Chem 2016; 4:13. [PMID: 27066476 PMCID: PMC4814711 DOI: 10.3389/fchem.2016.00013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 03/16/2016] [Indexed: 11/25/2022] Open
Abstract
The present study aimed to investigate the influence of albumin structure and gold speciation on the synthesis of gold nanoparticles (GNPs). The strategy of synthesis was the addition of HAuCl4 solutions at different pH values (3–12) to solutions of human and bovine serum albumins (HSA and BSA) at the same corresponding pH values. Different pH values influence the GNP synthesis due to gold speciation. Besides the inherent effect of pH on the native structure of albumins, the use N-ethylmaleimide (NEM)-treated and heat-denaturated forms of HSA and BSA provided additional insights about the influence of protein structure, net charge, and thiol group approachability on the GNP synthesis. NEM treatment, heating, and the extreme values of pH promoted loss of the native albumin structure. The formation of GNPs indicated by the appearance of surface plasmon resonance (SPR) bands became detectable from 15 days of the synthesis processes that were carried out with native, NEM-treated and heat-denaturated forms of HSA and BSA, exclusively at pH 6 and 7. After 2 months of incubation, SPR band was also detected for all synthesis carried out at pH 8.0. The mean values of the hydrodynamic radius (RH) were 24 and 34 nm for GNPs synthesized with native HSA and BSA, respectively. X-ray diffraction (XRD) revealed crystallites of 13 nm. RH, XRD, and zeta potential values were consistent with GNP capping by the albumins. However, the GNPs produced with NEM-treated and heat-denaturated albumins exhibited loss of protein capping by lowering the ionic strength. This result suggests a significant contribution of non-electrostatic interactions of albumins with the GNP surface, in these conditions. The denaturation of proteins exposes hydrophobic groups to the solvent, and these groups could interact with the gold surface. In these conditions, the thiol blockage or oxidation, the latter probably favored upon heating, impaired the formation of a stable capping by thiol coordination with the gold surface. Therefore, the cysteine side chain of albumins is important for the colloidal stabilization of GNPs rather than as the reducing agent for the synthesis. Despite the presence of more reactive gold species at more acidic pH values, i.e., below 6.0, in these conditions the loss of native albumin structure impaired GNP synthesis. Alkaline pH values (9–12) combined the unfavorable conditions of denaturated protein structure with less reactive gold species. Therefore, an optimal condition for the synthesis of GNPs using serum albumins involves more reactive gold salt species combined with a reducing and negatively charged form of the protein, all favored at pH 6–7.
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Affiliation(s)
- Érica G A Miranda
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - Aryane Tofanello
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - Adrianne M M Brito
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - David M Lopes
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | | | - Carlos E de Castro
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - Fanny N Costa
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - Fernando C Giacomelli
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | - Fabio F Ferreira
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
| | | | - Iseli L Nantes
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC Santo André, Brazil
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15
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Prajapati R, Bhattacharya A, Mukherjee TK. Resonant excitation energy transfer from carbon dots to different sized silver nanoparticles. Phys Chem Chem Phys 2016; 18:28911-28918. [DOI: 10.1039/c6cp05451j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In the present study we have demonstrated the size-dependent resonant nanometal surface energy transfer (NSET) from carbon dots (CDs) to silver nanoparticles (Ag NPs) using photoluminescence spectroscopy.
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Affiliation(s)
- Roopali Prajapati
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Simrol
- Indore-453552
- India
| | - Arpan Bhattacharya
- Discipline of Chemistry
- Indian Institute of Technology Indore
- Simrol
- Indore-453552
- India
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16
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Kiran GS, Ninawe AS, Lipton AN, Pandian V, Selvin J. Rhamnolipid biosurfactants: evolutionary implications, applications and future prospects from untapped marine resource. Crit Rev Biotechnol 2015; 36:399-415. [PMID: 25641324 DOI: 10.3109/07388551.2014.979758] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Rhamnolipid-biosurfactants are known to be produced by the genus Pseudomonas, however recent literature reported that rhamnolipids (RLs) are distributed among diverse microbial genera. To integrate the evolutionary implications of rhamnosyl transferase among various groups of microorganisms, a comprehensive comparative motif analysis was performed amongst bacterial producers. Findings on new RL-producing microorganism is helpful from a biotechnological perspective and to replace infective P. aeruginosa strains which ultimately ensure industrially safe production of RLs. Halotolerant biosurfactants are required for efficient bioremediation of marine oil spills. An insight on the exploitation of marine microbes as the potential source of RL biosurfactants is highlighted in the present review. An economic production process, solid-state fermentation using agro-industrial and industrial waste would increase the scope of biosurfactants commercialization. Potential and prospective applications of RL-biosurfactants including hydrocarbon bioremediation, heavy metal removal, antibiofilm activity/biofilm disruption and greener synthesis of nanoparticles are highlighted in this review.
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Affiliation(s)
- George Seghal Kiran
- a Department of Food Science and Technology , Pondicherry University , Puducherry , India
| | | | - Anuj Nishanth Lipton
- c Microbial Genomics Research Unit, Department of Microbiology , Pondicherry University , Puducherry , India , and
| | | | - Joseph Selvin
- c Microbial Genomics Research Unit, Department of Microbiology , Pondicherry University , Puducherry , India , and
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17
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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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18
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Wang K, Liao J, Yang X, Zhao M, Chen M, Yao W, Tan W, Lan X. A label-free aptasensor for highly sensitive detection of ATP and thrombin based on metal-enhanced PicoGreen fluorescence. Biosens Bioelectron 2014; 63:172-177. [PMID: 25086329 DOI: 10.1016/j.bios.2014.07.022] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 06/27/2014] [Accepted: 07/08/2014] [Indexed: 11/29/2022]
Abstract
A label-free fluorescence aptasensor for highly selective and sensitive detection of ATP and thrombin was developed by using PicoGreen (PG) as signal molecule and surface-bound metal-enhanced fluorescence (MEF) substrates (silver island films, SIFs) as signal enhancers. On binding with ATP or thrombin, aptamers undergo structure switching, leading to a reduction of fluorescence intensity of PG. Chang of fluorescence intensity can be magnified by SIFs. The limit of detection for ATP and thrombin is 1.3 nM and 0.073 nM, respectively. The fluorescence quenching efficiency is linear in the logarithmic scale with ATP concentration range from 10 nM to 100 μM (R(2)=0.995) and thrombin concentration range from 0.1 nM to 100 nM (R(2)=0.997). The coefficients of variation of the intra-assay reproducibility and inter-assay reproducibility for ATP (10 μM) assay are 3.8% and 5.2%, respectively. In addition, the aptasensor is stable and can be reliably used for ATP measurement in biological samples. Overall, the aptasensor can be a useful and cost effective tool for the specific detection of ATP, thrombin and potentially other biomolecules in biological samples.
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Affiliation(s)
- Kaiyu Wang
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China; Department of Laboratory Medicine, Fuzong Clinical College, Fujian Medical University, Fuzhou 350025, PR China
| | - Jian Liao
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China
| | - Xiangyue Yang
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China
| | - Meng Zhao
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China
| | - Min Chen
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China
| | - Weirong Yao
- Department of Laboratory Medicine, Fuzong Clinical College, Fujian Medical University, Fuzhou 350025, PR China
| | - Weihong Tan
- Center for Research at the Bio/Nano Interface, Department of Chemistry and Shands Cancer Center, University of Florida, Gainesville, Florida 32611, United States; Plant Pathology Lab, North Florida Research and Education Center, University of Florida, Quincy, Florida 32351, United States; Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Biology, Collaborative Innovation Center for Chemistry and Molecular Medicine, Hunan University, Changsha 410082, PR China.
| | - Xiaopeng Lan
- Institute of Laboratory Medicine, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025, PR China; Department of Laboratory Medicine, Dongfang Hospital, Xiamen University, Fuzhou 350025, PR China; Department of Laboratory Medicine, Fuzong Clinical College, Fujian Medical University, Fuzhou 350025, PR China.
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Chatterjee K, Sarkar S, Jagajjanani Rao K, Paria S. Core/shell nanoparticles in biomedical applications. Adv Colloid Interface Sci 2014; 209:8-39. [PMID: 24491963 DOI: 10.1016/j.cis.2013.12.008] [Citation(s) in RCA: 236] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 12/19/2013] [Accepted: 12/19/2013] [Indexed: 12/21/2022]
Abstract
Nanoparticles have several exciting applications in different areas and biomedial field is not an exception of that because of their exciting performance in bioimaging, targeted drug and gene delivery, sensors, and so on. It has been found that among several classes of nanoparticles core/shell is most promising for different biomedical applications because of several advantages over simple nanoparticles. This review highlights the development of core/shell nanoparticles-based biomedical research during approximately past two decades. Applications of different types of core/shell nanoparticles are classified in terms of five major aspects such as bioimaging, biosensor, targeted drug delivery, DNA/RNA interaction, and targeted gene delivery.
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Abstract
In recent years, various methods for the synthesis of fluorescent core-shell nanostructures were developed, optimized, and studied thoroughly in our research group. Metallic cores exhibiting plasmonic properties in the UV and visible regions of the electromagnetic spectrum were used to increase substantially the brightness and stability of organic fluorophores encapsulated in silica shells. Furthermore, the efficiency and range of Förster resonant energy transfer (FRET) between donor and acceptor molecules located in the vicinity of the metallic core was shown to be enhanced. Such multilayer nanoparticle architectures offer, in addition to the aforementioned advantages, excellent chemical and physical stability, solubility in aqueous media, low toxicity, and high detectability. In view of these enviable characteristics, a plethora of applications have been envisioned in biology, analytical chemistry, and medical diagnostics. In this paper, advances in the development of multilayer core-shell luminescent nanoparticle structures and selected applications to bioanalytical chemistry will be described.
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21
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Kochuveedu ST, Kim DH. Surface plasmon resonance mediated photoluminescence properties of nanostructured multicomponent fluorophore systems. NANOSCALE 2014; 6:4966-4984. [PMID: 24710702 DOI: 10.1039/c4nr00241e] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interaction between light and matter is the fundamental aspect of many optoelectronic applications. The efficiency of such devices is mainly dictated by the light emitting properties of fluorophores. Unfortunately, the intensity of emission is adversely affected by surface defects, scattering and chemical instability. Therefore, enhancing the luminescence of fluorophores is necessary for better implementation of nanocomposites in biological and optical applications. There are many interesting phenomena which can be observed if the characteristics of the fluorophores and metal nanoparticles are integrated. Photoluminescence (PL) by fluorophores can be enhanced or quenched by the presence of neighboring plasmonic metal nanostructures. An unambiguous study of the mechanism behind the enhancement and the quenching of emission is necessary to obtain new insight into the interactions between light and metal-fluorophore nanocomposites. In this review the core aspect of combining plasmonic metal nanostructures with fluorophores is discussed by considering various functional roles of plasmonic metals in modifying the PL properties reported by various research groups. A few representative applications of SPR mediated luminescence are also discussed.
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Affiliation(s)
- Saji Thomas Kochuveedu
- Department of Chemistry and Nano Science, Global Top 5 Research Program, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, Korea.
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22
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Cui Q, He F, Li L, Möhwald H. Controllable metal-enhanced fluorescence in organized films and colloidal system. Adv Colloid Interface Sci 2014; 207:164-77. [PMID: 24182686 DOI: 10.1016/j.cis.2013.10.011] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Revised: 10/10/2013] [Accepted: 10/10/2013] [Indexed: 12/28/2022]
Abstract
In recent years, considerable efforts have been devoted to better understand the unique emission properties of fluorophores enhanced by the localized surface plasmon resonance of metal nanoparticles (NPs), due to the widespread applications of fluorescence techniques. It is demonstrated by experiment and theoretical calculation that the enhancement efficiency strongly depends on the morphology of the metal NPs, the spectral overlap between metal and fluorophores, the separation distance between them, and other factors. Among these aspects to be considered are suitable spacer material and assembling methods to control the spatial arrangement of plasmonic NPs and fluorophore with proper optical properties and interactions. In this contribution, we provide a brief overview on recent progress of metal-enhanced fluorescence in organized films and colloidal systems.
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24
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Aptamer-functionalized silver nanoparticles for scanometric detection of platelet-derived growth factor-BB. Anal Chim Acta 2013; 812:152-60. [PMID: 24491776 DOI: 10.1016/j.aca.2013.12.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 12/09/2013] [Accepted: 12/18/2013] [Indexed: 12/30/2022]
Abstract
In this work, we reported a scanometric assay system based on the aptamer-functionalized silver nanoparticles (apt-AgNPs) for detection of platelet-derived growth factor-BB (PDGF-BB) protein. The aptamer and ssDNA were bound with silver nanoparticles by self-assembly of sulfhydryl group at 5' end to form the apt-AgNPs probe. The apt-AgNPs probe can catalyze the reduction of metallic ions in color agent to generate metal deposition that can be captured both by human eyes and a flatbed scanner. Two different color agents, silver enhancer solution and color agent 1 (10 mM HAuCl4+2 mM hydroquinone) were used to develop silver and gold shell on the surface of AgNPs separately. The results demonstrated that the formation of Ag core-Au shell structure had some advantages especially in the low concentrations. The apt-AgNPs probe coupled with color agent 1 showed remarkable superiority in both sensitivity and detection limit compared to the apt-AuNPs system. The apt-AgNPs system also produced a wider linear range from 1.56 ng mL(-1) to 100 ng mL(-1) for PDGF-BB with the detection limit lower than 1.56 ng mL(-1). The present strategy was applied to the determination of PDGF-BB in 10% serum, and the results showed that it had good specificity in complex biological media.
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25
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Samal AK, Polavarapu L, Rodal-Cedeira S, Liz-Marzán LM, Pérez-Juste J, Pastoriza-Santos I. Size tunable Au@Ag core-shell nanoparticles: synthesis and surface-enhanced Raman scattering properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15076-82. [PMID: 24261458 DOI: 10.1021/la403707j] [Citation(s) in RCA: 165] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We describe a simple and efficient methodology for the aqueous synthesis of stable, uniform, and size tunable Au@Ag core-shell nanoparticles (NPs) that are stabilized by citrate ions. The synthetic route is based on the stepwise Ag reduction on preformed Au NPs. The final size of the core-shell NPs and therefore their optical properties can be modulated at least from 30 to 110 nm by either tuning the Ag shell thickness or changing the size of the Au core. The optical properties of the Au@Ag core-shell NPs resemble those of pure Ag NPs of similar sizes, which was confirmed by means of Mie extinction calculations. We additionally evaluated the surface-enhanced raman scattering (SERS) enhancing properties of Au@Ag core-shell NP colloids with three different laser lines (532, 633, and 785 nm). Importantly, such core-shell NPs also exhibit a higher SERS efficiency than Ag NPs of similar size under near-infrared excitation. The results obtained here serve as a basis to select Au@Ag core-shell NPs of specific size and composition with maximum SERS efficiency at their respective excitation wavelengths for SERS-based analytical and bioimaging applications.
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Affiliation(s)
- Akshaya K Samal
- Departamento de Química Física, Universidade de Vigo , 36310 Pontevedra, Spain
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26
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Centeno A, Xie F, Alford N. Predicting the fluorescent enhancement rate by gold and silver nanospheres using finite‐difference time‐domain analysis. IET Nanobiotechnol 2013; 7:50-8. [DOI: 10.1049/iet-nbt.2012.0016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Anthony Centeno
- Electronic Systems Engineering DepartmentMalaysia Japan International Institute of TechnologyUTM Kuala LumpurJalan Semarak54100Kuala LumpurMalaysia
| | - Fang Xie
- Department of MaterialsImperial College LondonExhibition RoadLondon SW7 2AZUK
| | - Neil Alford
- Department of MaterialsImperial College LondonExhibition RoadLondon SW7 2AZUK
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27
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Liu CW, Lin YR, Fang CS, Latouche C, Kahlal S, Saillard JY. [Ag7(H){E2P(OR)2}6] (E = Se, S): Precursors for the Fabrication of Silver Nanoparticles. Inorg Chem 2013; 52:2070-7. [DOI: 10.1021/ic302482p] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- C. W. Liu
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C
| | - Yan-Ru Lin
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C
| | - Ching-Shiang Fang
- Department of Chemistry, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C
| | - Camille Latouche
- UMR-CNRS, 6226 ‘‘Institut
des Sciences Chimiques de Rennes’’, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Samia Kahlal
- UMR-CNRS, 6226 ‘‘Institut
des Sciences Chimiques de Rennes’’, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Jean-Yves Saillard
- UMR-CNRS, 6226 ‘‘Institut
des Sciences Chimiques de Rennes’’, Université de Rennes 1, 35042 Rennes Cedex, France
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28
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Deng W, Xie F, Baltar HTMCM, Goldys EM. Metal-enhanced fluorescence in the life sciences: here, now and beyond. Phys Chem Chem Phys 2013; 15:15695-708. [DOI: 10.1039/c3cp50206f] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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29
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30
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Darvill D, Centeno A, Xie F. Plasmonic fluorescence enhancement by metal nanostructures: shaping the future of bionanotechnology. Phys Chem Chem Phys 2013; 15:15709-26. [DOI: 10.1039/c3cp50415h] [Citation(s) in RCA: 144] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Xie F, Centeno A, Ryan MR, Riley DJ, Alford NM. Au nanostructures by colloidal lithography: from quenching to extensive fluorescence enhancement. J Mater Chem B 2012; 1:536-543. [PMID: 32260825 DOI: 10.1039/c2tb00278g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enhanced local electric fields are created by nanoparticles when pumped at wavelengths corresponding to Localised Surface Plasmon Resonance (LSPR) modes, leading to Metal Induced Fluorescence Enhancement (MIFE). This paper describes the fluorescent enhancement due to reproducible and tuneable Au nanostructures on glass substrates fabricated over large areas by colloidal lithography. Interparticle separation, particle resonance, and the fluorescent dye properties (quantum yield and emission/excitation wavelengths) are all important factors influencing the fluorescent enhancement. A maximum fluorescence enhancement of 69 times from near infra-red (NIR) dye Alexa Fluor® 790 was observed.
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Affiliation(s)
- Fang Xie
- Department of Materials and London Centre for Nanotechnology, Imperial College London, London, SW7 2AZ, UK.
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32
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Jeon TY, Pinna N, Yoo SJ, Ahn D, Choi SH, Willinger MG, Cho YH, Lee KS, Park HY, Yu SH, Sung YE. Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts. NANOSCALE 2012; 4:6461-6469. [PMID: 22955320 DOI: 10.1039/c2nr31819a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report a new method for deposition of Pt on a metal core to develop real electrocatalysts with significantly reduced amounts of expensive Pt as well as enhanced activity for oxygen reduction reaction. Ru and Pd have different crystal structures and modify the electronic structure of Pt to a different extent (shifts in d-band center). They were chosen as core materials to examine whether hydroquinone dissolved in ethanol can be used to deposit additional Pt atoms onto preformed core nanoparticles, and whether the modified d-character of Pt on different host metals can result in the enhanced ORR activity. The physicochemical characteristics of Pd-Pt and Ru-Pt core-shell nanoparticles are investigated. The core-shell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical measurements, and synchrotron X-ray measurements such as powder X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. The hydroquinone reduction method proved to be an excellent route for the epitaxial growth of a Pt shell on the metal cores, leading to enhanced ORR activities.
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Affiliation(s)
- Tae-Yeol Jeon
- World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, Korea
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Choudhury SD, Badugu R, Ray K, Lakowicz JR. Silver-Gold Nanocomposite Substrates for Metal-Enhanced Fluorescence: Ensemble and Single-Molecule Spectroscopic Studies. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2012; 116:5042-5048. [PMID: 22707999 PMCID: PMC3374657 DOI: 10.1021/jp212242x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In recent years, there has been a growing interest in the studies involving the interactions of fluorophores with plasmonic nanostructures or nanoparticles. These interactions lead to several favorable effects such as increase in the fluorescence intensities, increased photostabilities, and reduced excited-state lifetimes that can be exploited to improve the capabilities of present fluorescence methodologies. In this regard, we report the use of newly developed silver-gold nanocomposite (Ag-Au-NC) structures as substrates for metal-enhanced fluorescence (MEF). The Ag-Au-NC substrates have been prepared by a one-step galvanic replacement reaction from thin silver films coated on glass slides. This approach is simple and suitable for the fabrication of MEF substrates with large area. We have observed about 15-fold enhancement in the fluorescence intensity of ATTO655 from ensemble fluorescence measurements using these substrates. The fluorescence enhancement on the Ag-Au-NC substrates is also accompanied by a reduction in the fluorescence lifetime of ATTO655, which is consistent with the fluorophore-plasmon coupling mechanism. Single-molecule fluorescence measurements have been performed to gain more insight into the metal-fluorophore interactions and to unravel the heterogeneity in the interaction of individual fluorophores with the fabricated substrates. The single-molecule studies are in good agreement with the ensemble measurements and show maximum enhancements of ~50-fold for molecules located in proximity to the "hotspots" on the substrates. In essence, the Ag-Au-NC substrates have a very good potential for various MEF applications.
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Affiliation(s)
- Sharmistha Dutta Choudhury
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Ramachandram Badugu
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201, United States
| | - Krishanu Ray
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland Baltimore, 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 Baltimore, 725 West Lombard Street, Baltimore, Maryland 21201, United States
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34
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Synthesis, properties, and optical applications of noble metal nanoparticle-biomolecule conjugates. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s11434-011-4747-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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35
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Maiti S, Dutta S, Das PK. Unmodified "GNP-oligonucleotide" nanobiohybrids: a simple route for emission enhancement of DNA intercalators. Chemistry 2011; 17:7538-48. [PMID: 21567505 DOI: 10.1002/chem.201100622] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Indexed: 11/07/2022]
Abstract
We present herein a simple method for enhancing the emission of DNA intercalators in homogeneous nanobiohybrids of unlabeled oligonucleotides and unmodified gold nanoparticles (GNPs). Pristine single-stranded DNA (ss-DNA) has been wrapped around unmodified GNPs to induce metal-enhanced fluorescence (MEF) of DNA intercalators, such as ethidium bromide and propidium iodide. The thickness of the ss-DNA layer on the gold nanosurface determines the extent of MEF, since this depends on the position of the intercalator in relation to the metal surface. Presumably, at a suitable thickness of this DNA layer, more of the intercalator is localized at the optimum distance from the nanoparticle to give rise to MEF. Importantly, no external spacer or coating agent was needed to induce the MEF effect of the GNPs. The concentration ratios of Au to DNA in the nanohybrids, as well as the capping agents applied to the GNPs, play key roles in enhancing the emission of the intercalators. The dimensions of both components of the nanobiohybrids, that is, the size of the GNPs and the length of the oligonucleotide, have considerable influences on the emission enhancement of the intercalators. Emission intensity increased with increasing size of the GNPs and length of the oligonucleotide only when the DNA efficiently wrapped the nanoparticles. An almost 100 % increment in the quantum yield of ethidium bromide was achieved with the GNP-DNA nanobiohybrid compared with that with DNA alone (in the absence of GNP), and the fluorescence emission was enhanced by 50 % even at an oligonucleotide concentration of 2 nM. The plasmonic effect of the GNPs in the emission enhancement was also established by the use of similar nanobioconjugates of ss-DNA with nonmetallic carbon nanoparticles and TiO(2) nanoparticles, with which no increase in the fluorescence emission of ethidium bromide was observed.
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Affiliation(s)
- Subhabrata Maiti
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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Athilakshmi J, Chand DK. Hexazamacrocycle assisted sensing of silver ion through facile synthesis of silver nanoparticles. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.091] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Lanthanide luminescence efficiency in eight- and nine-coordinate complexes: Role of the radiative lifetime. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2010.04.002] [Citation(s) in RCA: 189] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Grell TAJ, Paredes E, Das SR, Aslan K. Quantitative Comparison of Protein Surface Coverage on Glass Slides and Silver Island Films in Metal-Enhanced Fluorescence-based Biosensing Applications. ACTA ACUST UNITED AC 2010; 2:165-170. [PMID: 21949593 DOI: 10.5101/nbe.v2i3.p165-170] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The use of Metal-Enhanced Fluorescence (MEF) phenomenon in fluorescence-based bioassays affords for increased sensitivity to be realized by incorporating metal nanoparticles onto planar surfaces. The close-range interactions of metal-fluorophores result in increased fluorescence emission from the bioassays, which in turn affords for the detection of target biomolecules at lower concentrations. Moreover, the use of silver nanoparticles increases the photostability of fluorophores improving the detectability of fluorescence emission under prolonged use of excitation light. Although numerous reports on MEF-based biosensing applications exist, the contribution of protein coverage on Silver Island Films (SIFs) on the increased fluorescence emission was never investigated. This work presents our findings on the quantitative comparison of protein surface coverage on SIFs and blank glass slides. In this regard, identical protein bioassay for a model protein (biotinylated bovine serum albumin, b-BSA) on these surfaces is constructed and the relative extent of protein surface coverage on SIFs and blank glass slides was determined using radio-labeled biomolecules. It was found that the total scintillation counts on SIFs and blank glass slides were similar for BSA concentrations ranging from 1 μM to 1 pM, which implies that increased fluorescence in MEF-based biosensing applications is only due to metal-fluorophore interactions.
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Affiliation(s)
- Tsehai A J Grell
- Morgan State University, Department of Chemistry, 1700 East Cold Spring Lane, Baltimore, MD, 21251, USA
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Deng W, Jin D, Drozdowicz-Tomsia K, Yuan J, Goldys EM. Europium chelate (BHHCT-Eu3+) and its metal nanostructure enhanced luminescence applied to bioassays and time-gated bioimaging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:10036-10043. [PMID: 20405866 DOI: 10.1021/la100158g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the use of europium chelate, 4,4'-bis(1'',1'',1'',2'',2'',3'',3''-heptafluoro-4'',6''-hexanedion-6''-yl)chlorosulfo-o-terphenyl-Eu(3+) (BHHCT-Eu(3+)), in silver nanostructure-enhanced luminescence and its application to bioassays and bioimaging. The highest luminescence intensity enhancement factor of BHHCT-Eu(3+) achieved in this study was about 11 times, while the simultaneously measured luminescence lifetime was reduced 2-fold. The luminophore photostability was also improved by a factor of 3. On the basis of these experimental results, we estimated the impact of silver nanostructures on the excitation and emission enhancement factors. Luminescence enhancement was demonstrated in two geometries: on planar glass substrates and on silica beads. In the biotin-modified IgG antibody assay the bead geometry provided slightly higher enhancement factor and greater sensitivity. Subsequently, we applied such bead substrates to time-gated luminescence imaging of Giardia lamblia cells stained by BHHCT-Eu(3+) where we observed improved brightness by a factor of 2. Such improved photostability and brightness of BHHCT-Eu(3+) in the presence of metal nanostructures are highly desirable for ultrasensitive bioassays and bioimaging, especially with time gating.
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Affiliation(s)
- Wei Deng
- Department of Engineering and Physics, Macquarie University, North Ryde 2109 NSW, Australia
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40
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Haverkamp RG. A Decade of Nanoparticle Research in Australia and New Zealand. PARTICULATE SCIENCE AND TECHNOLOGY 2010. [DOI: 10.1080/02726350903405387] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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42
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Takei H, Yamaguchi T. A combinatorial approach toward fabrication of surface-adsorbed metal nanoparticles for investigation of an enzyme reaction. Phys Chem Chem Phys 2010; 12:4505-14. [DOI: 10.1039/b924233n] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Deng W, Drozdowicz-Tomsia K, Jin D, Goldys EM. Enhanced flow cytometry-based bead immunoassays using metal nanostructures. Anal Chem 2009; 81:7248-55. [PMID: 19715357 DOI: 10.1021/ac900947h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While the principle of fluorescence enhancement of metal nanostructures is well-known, the utility of this effect in practical methodologies used in analytical laboratories remains to be established. In this work, we explore the advantage of fluorescence enhancement for flow cytometry. We report the observation of metal-enhanced fluorescence emission of fluorophores located on the surface of silica beads coated with nanostructured silver, suitable for flow cytometry detection. The fluorescence enhancement was investigated using a model AlexaFluor 430 IgG immunoassay and AlexaFluor 430 labeling. Approximately 8.5-fold and 10.1-fold higher fluorescence intensities at 430 nm excitation were, respectively, observed from silvered approximately 400 nm and 5 microm silica beads deposited on glass as compared to the control sample. The 400 nm and 5 microm beads were compatible with the flow cytometry readout, although lower enhancement factors of 3.0 and 3.7 were obtained. We show that such values are consistent with less favorable overlap of the plasmon resonance in silver nanostructures with 488 nm excitation wavelength used in the flow cytometry experiment. We, thus, demonstrated that the silvered silica beads are able to provide intensified fluorescence signals in flow cytometry which can improve the sensitivity of flow cytometry-based bioassay systems.
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Affiliation(s)
- Wei Deng
- Department of Engineering and Physics, Macquarie University, North Ryde 2109 NSW, Australia
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Zhang J, Fu Y, Lakowicz JR. Luminescent Silica Core / Silver Shell Encapsulated with Eu(III) Complex. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2009; 113:19404-19410. [PMID: 20514146 PMCID: PMC2877519 DOI: 10.1021/jp906742q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this paper we studied the metal-enhanced emission from long-lifetime lanthanide dyes that were encapsulated in the silver nanoshells. The metal nanoshells were synthesized with the silica spherical cores of 50 nm diameters and the silver shells of 5 - 60 nm. The optical properties of luminescent metal shells were performed on the either ensemble fluorescence spectroscopy or single particle imaging. The emission intensity from the encapsulated lanthanides was observed to enhance significantly by the metal nanoshell. The enhancement efficiency initially increased with the metal shell thickness and then decreased. The maximal enhancement occurred at the 20 - 30 nm thickness. The lifetime of encapsulated Eu(III) complexes was shorten dramatically indicating that they were coupled efficiently with the metal shells. The increased brightness and reduced lifetime of this core-shell structure demonstrate that the lanthanides are favorable for the single target molecule detections after encapsulating into the metal nanoshells.
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Affiliation(s)
- Jian Zhang
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Yi Fu
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
| | - Joseph R. Lakowicz
- Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201
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Shankar SS, Rizzello L, Cingolani R, Rinaldi R, Pompa PP. Micro/nanoscale patterning of nanostructured metal substrates for plasmonic applications. ACS NANO 2009; 3:893-900. [PMID: 19320441 DOI: 10.1021/nn900077s] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The ability to precisely control the pattern of different metals at the micro- and nanoscale, along with their topology, has been demonstrated to be essential for many applications, ranging from material science to biomedical devices, electronics, and photonics. In this work, we show a novel approach, based on a combination of lithographic techniques and galvanic displacement reactions, to fabricate micro- and nanoscale patterns of different metals, with highly controlled surface roughness, onto a number of suitable substrates. We demonstrate the possibility to exploit such metal films to achieve significant fluorescence enhancement of nearby fluorophores, while maintaining accurate spatial control of the process, from submicron resolution to centimeter-sized features. These patterns may be also exploited for a wide range of applications, including SERS, solar cells, DNA microarray technology, hydrophobic/hydrophilic substrates, and magnetic devices.
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Affiliation(s)
- S Shiv Shankar
- National Nanotechnology Laboratory of CNR-INFM, IIT Research Unit, Via Arnesano 16, 73100 Lecce, Italy
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46
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Ma ZY, Dosev D, Kennedy IM. A microemulsion preparation of nanoparticles of europium in silica with luminescence enhancement using silver. NANOTECHNOLOGY 2009; 20:085608. [PMID: 19417456 PMCID: PMC2858688 DOI: 10.1088/0957-4484/20/8/085608] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A facile one-pot microemulsion method has been developed for the synthesis of spherical silver core-silica shell (Ag@SiO2) nanoparticles with europium chelates doped in the shell through a silane agent. The method is significantly more straightforward than other extant methods. Measurements of the luminescent emissions from the Ag@SiO2 nanoparticles, in comparison with control silica nanoparticles without silver cores, showed that the presence of the silver cores can increase the fluorescence intensity approximately 24-fold and decrease the luminescence lifetime. This enhancement offers a potential increase in overall particle detectability with increased fluorophore photostability.
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Affiliation(s)
- Zhi Ya Ma
- Department of Mechanical and Aeronautical Engineering, University of California Davis, CA 95616, USA
| | - Dosi Dosev
- Department of Mechanical and Aeronautical Engineering, University of California Davis, CA 95616, USA
| | - Ian M Kennedy
- Department of Mechanical and Aeronautical Engineering, University of California Davis, CA 95616, USA
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Gao Y, Wu J, Zhao Q, Zheng L, Zhou H, Zhang S, Yang J, Tian Y. Solvent-resolved fluorescent Ag nanocrystals capped with a novel terpyridine-based dye. NEW J CHEM 2009. [DOI: 10.1039/b815115f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Yamaguchi T, Kaya T, Aoyama M, Takei H. Surface-adsorbed silver half-shells as a platform for surface-enhanced immunoassays; optimization through morphological control. Analyst 2009; 134:776-83. [DOI: 10.1039/b808784a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Evans PR, Hendren WR, Atkinson R, Pollard RJ. Optical transmission measurements of silver, silver-gold alloy and silver-gold segmented nanorods in thin film alumina. NANOTECHNOLOGY 2008; 19:465708. [PMID: 21836263 DOI: 10.1088/0957-4484/19/46/465708] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Silver nanorods have been grown by electrodeposition into thin film porous alumina. Transmission measurements show two peaks related to the transverse and longitudinal resonance of the nanorods. The behaviour of the longitudinal resonance peak is found to vary with nanorod length and the spectral position to depend on nanorod diameter. As the distance between the nanorods is decreased a small blue-shift of the longitudinal peak is observed. Depositing a small gold cap on top of the silver nanorods causes a red-shift of the longitudinal peak whilst, conversely, the longitudinal peak of gold nanorod arrays is comparatively insensitive to the deposition of a silver cap. Gold-silver alloy nanorods were also deposited from a mixed salt bath and a linear dependence of the transverse peak position on alloy composition was observed.
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Affiliation(s)
- P R Evans
- Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University of Belfast, University Road, Belfast BT7 1NN, UK
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50
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Dasary SSR, Rai US, Yu H, Anjaneyulu Y, Dubey M, Ray PC. Gold Nanoparticle Based Surface Enhanced Fluorescence For Detection of Organophosphorus Agents. Chem Phys Lett 2008; 460:187-190. [PMID: 24031096 PMCID: PMC3768136 DOI: 10.1016/j.cplett.2008.05.082] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Organophosphorus agents (OPA) represent a serious concern to public safety as nerve agents and pesticides. Here we report the development of gold nanoparticle based surface enhanced fluorescence (NSEF) spectroscopy for rapid and sensitive screening of organophosphorus agents. Fluorescent from Eu3+ ions that are bound within the electromagnetic field of gold nanoparticles exhibit a strong enhancement. In the presence of OPA, Eu3+ ions are released from the gold nanoparticle surface and thus a very distinct fluorescence signal change was observed. We discussed the mechanism of fluorescence enhancement and the role of OPA for fluorescence intensity change in the presence of gold nanoparticles.
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Affiliation(s)
- Samuel S R Dasary
- Department of Chemistry, Jackson State University, Jackson, MS 39217, USA
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