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Metal enhanced fluorescence

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https://www.readbyqxmd.com/read/29028316/tailoring-nanocrystalline-metal-organic-frameworks-as-fluorescent-dye-carriers-for-bioimaging
#1
UnJin Ryu, Jounghyun Yoo, Woosung Kwon, Kyung Min Choi
Challenges exist in taking advantage of dye molecules for reliable and reproducible molecular probes in biomedical applications. In this study, we show how to utilize the dye molecules for bioimaging within protective carriers of nanocrystalline metal-organic frameworks (nMOFs) particles. Specifically, Resorufin and Rhodamine-6G having different molecular sizes were encapsulated within close-fitting pores of nMOF-801 and nUiO-67 particles, respectively. The resulting nanocrystalline particles have high crystallinity, uniform size, and morphology and preserve enhanced photoluminescence properties with exceptional stabilities in biomedical environment...
October 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29027923/plasmonic-nanomaterial-based-optical-biosensing-platforms-for-virus-detection
#2
REVIEW
Jaewook Lee, Kenshin Takemura, Enoch Y Park
Plasmonic nanomaterials (P-NM) are receiving attention due to their excellent properties, which include surface-enhanced Raman scattering (SERS), localized surface plasmon resonance (LSPR) effects, plasmonic resonance energy transfer (PRET), and magneto optical (MO) effects. To obtain such plasmonic properties, many nanomaterials have been developed, including metal nanoparticles (MNP), bimetallic nanoparticles (bMNP), MNP-decorated carbon nanotubes, (MNP-CNT), and MNP-modified graphene (MNP-GRP). These P-NMs may eventually be applied to optical biosensing systems due to their unique properties...
October 13, 2017: Sensors
https://www.readbyqxmd.com/read/29024861/tunable-photoluminescence-of-mos2-quantum-dots-passivated-by-different-functional-groups
#3
Xingqun Zhu, Junxiang Xiang, Jing Li, Chao Feng, Ping Liu, Bin Xiang
Recently, transitional metal dichalcogenides quantum dots have attracted much interest as a potential candidate for the application of fluorescent materials. However, little work has been done on tuning their band gap by varying functional groups. Here, we report a band-gap tunability of 1eV in the MoS2 quantum dots (QDs) modified by different functional groups. In our results, it has also been confirmed that a tunable band gap in the MoS2 QDs can be achieved by monotonically varying the concentration of a functional group...
October 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28994579/dual-amplification-fluorescence-assay-for-alpha-fetal-protein-utilizing-immuno-hybridization-chain-reaction-and-metal-enhanced-fluorescence-of-carbon-nanodots
#4
Dangdang Xu, Cui Liu, Chengyu Li, Chongyang Song, Yafeng Kang, Chu-Bo Qi, Yi Lin, Dai-Wen Pang, Hong-Wu Tang
As an emerging fascinating fluorescent nanomaterial, carbon nanodots (CDs) have attracted much attention due to their unique properties such as small size, antiphotobleaching and biocompatibility. However, its use in biomedical analysis is limited due to its low quantum yield. Herein, we constructed a dual amplification fluorescence sensor by incorporating immuno-hybridization chain reaction (HCR) and metal-enhanced fluorescence (MEF) of CDs for the detection of alpha fetal protein (AFP). The immuno-plasmonic slide and detection antibodies conjugated oligonucleotide initiator are served to capture and probe AFP molecules, respectively...
October 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28990631/a-chemosensor-for-micro-to-nano-molar-detection-of-ag-and-hg-2-ions-in-pure-aqueous-media-and-its-applications-in-cell-imaging
#5
Jitendra P Nandre, Samadhan R Patil, Suban K Sahoo, Chullikkattil P Pradeep, Andrei Churakov, Fabiao Yu, Lingxin Chen, Carl Redshaw, Ashok A Patil, Umesh D Patil
The pyridine substituted thiourea derivative PTB-1 was synthesized and characterized by spectroscopic techniques as well as by single crystal X-ray crystallography. The metal ion sensing ability of PTB-1 was explored by various experimental (naked-eye, UV-Vis, fluorescence, mass spectrometry and (1)H NMR spectroscopy) and theoretical (B3LYP/6-31G**/LANL2DZ) methods. PTB-1 exhibited a highly selective naked-eye detectable color change from colorless to dark brown and UV-Vis spectral changes for the detection of Ag(+) with a detection limit of 3...
October 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28988084/fluorescent-sensor-based-models-for-the-detection-of-environmentally-related-toxic-heavy-metals
#6
REVIEW
Tahir Rasheed, Muhammad Bilal, Faran Nabeel, Hafiz M N Iqbal, Chuanlong Li, Yongfeng Zhou
The quest for industrial and biotechnological revolution has been contributed in increasing environmental contamination issues, worldwide. The controlled or uncontrolled release of hazardous pollutants from various industrial sectors is one of the key problems facing humanity. Among them, adverse influences of lead, cadmium, and mercury on human health are well known to cause many disorders like reproductive, neurological, endocrine system, and cardiovascular, etc. Besides their presence at lower concentrations, most of these toxic heavy metals are posing noteworthy toxicological concerns...
October 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28976506/instant-room-temperature-synthesis-of-self-assembled-emission-tunable-gold-nanoclusters-million-fold-emission-enhancement-and-fluorimetric-detection-of-zn-2-%C3%A2
#7
Balamurugan Kuppan, Uday Maitra
Facile synthesis of luminescent metal nanoclusters (NCs) accompanied by emission color tuning is currently an active area of research. In this work we describe a rapid (1 s) room temperature synthesis of luminescent Au NCs from completely nonluminescent NCs through the incorporation of Zn(2+). The nanoclusters are initially stabilized by mercaptopropionate, and the coordination of Zn(2+) with the carboxylate groups of the ligands rigidifies the Au(i) thiolates restricting the intramolecular rotation-vibrational motion...
October 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28975794/development-of-well-preserved-substrate-versatile-latent-fingerprints-by-aggregation-induced-enhanced-emission-active-conjugated-polyelectrolyte
#8
Akhtar Hussain Malik, Anamika Kalita, Parameswar Krishnan Iyer
The development of highly efficient latent fingerprint (LFP) technology remains extremely vital for forensic and criminal investigations. In this contribution, a straightforward, rapid and cost-effective method has been established for the quick development of well-preserved latent fingerprint on multiple substrates including plastic, glass, aluminium foil, metallic surfaces, etc. without any additional treatment, based on aggregation induced enhanced emission (AIEE) active conjugated polyelectrolyte (CPE) PFTPEBT-MI, revealing clearly the third-level details (ridges, bifurcations and pores) with high selectivity, high contrast and no background interference even by blood stains, confirming the ability of the proposed technique for LFPs detection with high resolution...
October 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28971232/terbium-chelation-a-specific-fluorescent-tagging-of-human-transferrin-optimization-of-conditions-in-view-of-its-application-to-the-hplc-analysis-of-carbohydrate-deficient-transferrin-cdt
#9
Silvia Nicotra, Daniela Sorio, Giulia Filippi, Luca De Gioia, Veronica Paterlini, Elio Franco De Palo, Rita Grandori, Franco Tagliaro, Carlo Santambrogio
Transferrin (Tf) is the major iron-transporting protein in the human body and, for this reason, has been extensively studied in biomedicine. This protein undergoes a complex glycosylation process leading to several glycoforms, some of which are important in the diagnosis of alcohol abuse and of congenital glycosylation defects under the collective name of carbohydrate-deficient transferrin (CDT). Exploiting the Tf ability to bind not only iron but also other ions, specific attention has been devoted to binding activity towards Tb(3+), which was reported to greatly enhance its intrinsic fluorescence upon the interaction with Tf...
September 29, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28970896/nanoscale-metal-organic-frameworks-coated-with-poly-vinyl-alcohol-for-ratiometric-peroxynitrite-sensing-through-fret
#10
Zhaoyang Ding, Jinyun Tan, Gang Feng, Zhen Yuan, Changfeng Wu, Xuanjun Zhang
This work describes a facile yet powerful approach to energy-transfer NMOF (nanoscale metal-organic framework) fabrication for ratiometric peroxynitrite (ONOO(-)) sensing. Poly(vinyl alcohol) (PVA) is chosen to organize the energy donor (NMOF) and acceptor (molecular probes). PVA can conveniently graft onto the NMOF surface and bind to the molecular probes bearing the arylboronic acid group through multiple weak coordination interactions. Due to efficient Förster resonance energy transfer (FRET), the bright blue fluorescence of the NMOF is quenched while the green or red emission from the acceptor is enhanced...
July 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28960004/a-comparison-of-sers-and-mef-of-rhodamine-6g-on-a-gold-substrate
#11
Elizabeth Kohr, Buddini I Karawdeniya, Jason R Dwyer, Anju Gupta, William B Euler
Rhodamine 6G is spin-cast onto gold surfaces and the reflectance, emission, excitation, and SERS spectra are reported. Electron microscopy shows that the particle sizes of the gold are uniform for all preparations. Reflection spectra demonstrate the spectroscopic signature for Rh6G aggregates for thicker films and that the gold plasmon band shifts due to the refractive index change on the surface. The intensity of the SERS spectra increases with increasing surface coverage but the change is nonlinear between submonolayer and multilayer surface densities...
October 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28956875/a-luminescent-cerium-metal-organic-framework-for-the-turn-on-sensing-of-ascorbic-acid
#12
Dan Yue, Dian Zhao, Jun Zhang, Ling Zhang, Ke Jiang, Xin Zhang, Yuanjing Cui, Yu Yang, Banglin Chen, Guodong Qian
We report a cerium metal-organic framework (ZJU-136-Ce) for the turn-on fluorescence sensing of AA. The fluorescence enhancement is attributed to the specific redox reaction between AA and Ce(4+). The detection limit of AA reaches 7 nM, showing its potential for AA detection in the environmental industry and clinical medicine.
September 28, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28953361/dna-nanotechnology-enabled-chiral-plasmonics-from-static-to-dynamic
#13
Chao Zhou, Xiaoyang Duan, Na Liu
The development of DNA nanotechnology, especially the advent of DNA origami, has made DNA ideally suited to construct nanostructures with unprecedented complexity and arbitrariness. As a fully addressable platform, DNA origami can be used to organize discrete entities in space through DNA hybridization with nanometer accuracy. Among a variety of functionalized particles, metal nanoparticles such as gold nanoparticles (AuNPs) feature an important pathway to endow DNA-origami-assembled nanostructures with tailored optical functionalities...
September 27, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28949500/bioplasmonic-alloyed-nanoislands-using-dewetting-of-bilayer-thin-films
#14
Minhee Kang, Myeong-Su Ahn, Youngseop Lee, Ki-Hun Jeong
Unlike monometallic materials, bimetallic plasmonic materials offer extensive benefits such as broadband tuning capability or high environmental stability. Here we report a broad range tuning of plasmon resonance of alloyed nanoislands by using solid state dewetting of gold and silver bilayer thin films. Thermal dewetting after successive thermal evaporation of thin metal double-layer films readily forms AuAg-alloyed nano-islands with a precise composition ratio. The complete miscibility of alloyed nanoislands results in programmable tuning of plasmon resonance wavelength in a broadband visible range...
September 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28948092/the-effect-of-benzothiazolone-2-on-the-expression-of-metallothionein-3-in-modulating-alzheimer-s-disease
#15
Sudeep Roy, Jaromir Gumulec, Akhil Kumar, Martina Raudenska, Mohd Hassan Baig, Hana Polanska, Jan Balvan, Mansi Gupta, Petr Babula, Jan Odstrčilík, Inho Choi, Ivo Provaznik, Michal Masarik
INTRODUCTION: Metallothioneins (MTs) are a class of ubiquitously occurring low-molecular-weight cysteine- and metal-rich proteins containing sulfur-based metal clusters. MT-3 exhibits neuro-inhibitory activity. The possibility to enhance the expression of MT-3 or protect it from degradation is an attractive therapeutic target, because low levels of MT-3 were found in brains of Alzheimer's disease (AD) patients. OBJECTIVES: The primary objective of this study was to test an enhancement of MT-3 cellular concentration after MT-3 binding treatment, which could prevent MT-3 degradation...
September 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28946741/selective-heavy-element-sensing-with-a-simple-host-guest-fluorescent-array
#16
Yang Liu, Magi Mettry, Adam D Gill, Lizeth Perez, Wenwan Zhong, Richard J Hooley
A simple three component array of host-fluorophore complexes is capable of sensitive and selective discrimination of heavy metal ions, including lanthanide and actinide salts in aqueous solution. Instead of applying optical sensors that only use "single-mode" detection, i.e., coordination of the metal to a specific ligand and monitoring the change in emission of an appended fluorophore, we exploit a series of host-fluorophore complexes that are affected by the presence of small amounts of metal ions in aqueous solution in different ways...
October 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28936337/emerging-plasmonic-nanostructures-for-controlling-and-enhancing-photoluminescence
#17
REVIEW
Jeong-Eun Park, Jiyeon Kim, Jwa-Min Nam
Localised surface plasmon resonance endows plasmonic nanostructures with unique, powerful properties such as photoluminescence enhancement, which is a phenomenon based on the interaction between light and a metal nanostructure. In particular, photoluminescence modulation and enhancement are of importance to many research fields such as photonics, plasmonics and biosensing. In this minireview, we introduce basic principles of plasmonic-nanostructure photoluminescence and recently reported plasmonic nanostructures exhibiting surface-enhanced fluorescence and direct photoluminescence, with one-photon photoluminescence being of particular interest...
July 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28934107/cultivar-and-metal-specific-effects-of-endophytic-bacteria-in-helianthus-tuberosus-exposed-to-cd-and-zn
#18
Blanca Montalbán, Sofie Thijs, Mª Carmen Lobo, Nele Weyens, Marcel Ameloot, Jaco Vangronsveld, Araceli Pérez-Sanz
Plant growth promoting endophytic bacteria (PGPB) isolated from Brassica napus were inoculated in two cultivars of Helianthus tuberosus (VR and D19) growing on sand supplemented with 0.1 mM Cd or 1 mM Zn. Plant growth, concentrations of metals and thiobarbituric acid (TBA) reactive compounds were determined. Colonization of roots of H. tuberosus D19 by Pseudomonas sp. 262 was evaluated using confocal laser scanning microscopy. Pseudomonas sp. 228, Serratia sp. 246 and Pseudomonas sp. 262 significantly enhanced growth of H...
September 21, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28925704/ict-isomerization-induced-turn-on-fluorescence-probe-with-a-large-emission-shift-for-mercury-ion-application-in-combinational-molecular-logic
#19
Sushil Ranjan Bhatta, Bijan Mondal, Gonela Vijaykumar, Arunabha Thakur
A unique turn-on fluorescent device based on a ferrocene-aminonaphtholate derivative specific for Hg(2+) cation was developed. Upon binding with Hg(2+) ion, the probe shows a dramatic fluorescence enhancement (the fluorescence quantum yield increases 58-fold) along with a large red shift of 68 nm in the emission spectrum. The fluorescence enhancement with a red shift may be ascribed to the combinational effect of C═N isomerization and an extended intramolecular charge transfer (ICT) mechanism. The response was instantaneous with a detection limit of 2...
October 2, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28916108/a-eu-iii-doped-metal-organic-framework-conjugated-with-fluorescein-labeled-single-stranded-dna-for-detection-of-cu-ii-and-sulfide
#20
Han Weng, Bing Yan
In this paper, Bio-MOF-1 is prepared as reported and then Eu(3+) is introduced into it via cation exchange method. A FAM-labeled ssDNA is chosen to fabricate with the obtained Eu(3+)@Bio-MOF-1. A luminescent hybrid material is assembled, which can exhibit the fluorescence of Eu(3+) and FAM simultaneously by adjusting the ratio of FAM-ssDNA and Eu(3+)@Bio-MOF-1. The sample is then used for the detecting of metal ions, results shows which has good selectively for Cu(2+) (LOD = 0.14 μM, 0-250 μM). The introduction of Cu(2+) can quench the fluorescence of FAM while the luminescent intensity of Eu(3+) enhancing...
October 2, 2017: Analytica Chimica Acta
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