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Dong Z, Song B, Ma H, Gao X, Zhang W, Yuan J. A strategy to enhance the water solubility of luminescent β-diketonate-Europium(III) complexes for time-gated luminescence bioassays. Talanta 2024; 274:126000. [PMID: 38608630 DOI: 10.1016/j.talanta.2024.126000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 03/19/2024] [Accepted: 03/26/2024] [Indexed: 04/14/2024]
Abstract
Luminescent β-diketonate-europium(III) complexes have been found a wide range of applications in time-gated luminescence (TGL) bioassays, but their poor water solubility is a main problem that limits their effective uses. In this work we propose a simple and general strategy to enhance the water solubility of luminescent β-diketonate-europium(III) complexes that permits facile synthesis and purification. By introducing the fluorinated carboxylic acid group into the structures of β-diketone ligands, two highly water-soluble and luminescent Eu3+ complexes, PBBHD-Eu3+ and CPBBHD-Eu3+, were designed and synthesized. An excellent solubility exceeding 20 mg/mL for PBBHD-Eu3+ was found in a pure aqueous buffer, while it also displayed strong and long-lived luminescence (quantum yield φ = 26%, lifetime τ = 0.49 ms). After the carboxyl groups of PBBHD-Eu3+ were activated, the PBBHD-Eu3+-labeled streptavidin-bovine serum albumin (SA-BSA) conjugate was prepared, and successfully used for the immunoassay of human α-fetoprotein (AFP) and the imaging of an environmental pathogen Giardia lamblia under TGL mode, which demonstrated the practicability of PBBHD-Eu3+ for highly sensitive TGL bioassays. The carboxyl groups of PBBHD can also be easily derivatized with other reactive chemical groups, which enables PBBHD-Eu3+ to meet diverse requirements of biolabeling technique, to provide new opportunities for developing functional europium(III) complex biolabels serving for TGL bioassays.
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Affiliation(s)
- Zhiyuan Dong
- School of Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Bo Song
- School of Chemistry, Dalian University of Technology, Dalian, 116024, China.
| | - Hua Ma
- School of Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Xiaona Gao
- School of Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Wenzhu Zhang
- School of Chemistry, Dalian University of Technology, Dalian, 116024, China
| | - Jingli Yuan
- College of Life Science, Dalian Minzu University, 18 Liaohe West Road, Jinzhou New District, Dalian, 116600, China.
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2
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Ruiz-Arias A, Fueyo-González F, Izquierdo-García C, Navarro A, Gutiérrez-Rodríguez M, Herranz R, Burgio C, Reinoso A, Cuerva JM, Orte A, González-Vera JA. Exchangeable Self-Assembled Lanthanide Antennas for PLIM Microscopy. Angew Chem Int Ed Engl 2024; 63:e202314595. [PMID: 37991081 DOI: 10.1002/anie.202314595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/08/2023] [Accepted: 11/22/2023] [Indexed: 11/23/2023]
Abstract
Lanthanides have unique photoluminescence (PL) emission properties, including very long PL lifetimes. This makes them ideal for biological imaging applications, especially using PL lifetime imaging microscopy (PLIM). PLIM is an inherently multidimensional technique with exceptional advantages for quantitative biological imaging. Unfortunately, due to the required prolonged acquisitions times, photobleaching of lanthanide PL emission currently constitutes one of the main drawbacks of PLIM. In this study, we report a small aqueous-soluble, lanthanide antenna, 8-methoxy-2-oxo-1,2,4,5-tetrahydrocyclopenta[de]quinoline-3-phosphonic acid, PAnt, specifically designed to dynamically interact with lanthanide ions, serving as exchangeable dye aimed at mitigating photobleaching in PLIM microscopy in cellulo. Thus, self-assembled lanthanide complexes that may be photobleached during image acquisition are continuously replenished by intact lanthanide antennas from a large reservoir. Remarkably, our self-assembled lanthanide complex clearly demonstrated a significant reduction of PL photobleaching when compared to well-established lanthanide cryptates, used for bioimaging. This concept of exchangeable lanthanide antennas opens new possibilities for quantitative PLIM bioimaging.
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Affiliation(s)
- Alvaro Ruiz-Arias
- Nanoscopy-UGR Laboratory. Departamento de Fisicoquímica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071, Granada, Spain
| | - Francisco Fueyo-González
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
- Current address: Department of Medicine, Translational Transplant Research Center, Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, USA
| | | | - Amparo Navarro
- Departamento de Química Física y Analítica, Facultad de Ciencias Experimentales, Universidad de Jaén, 23071, Jaén, Spain
| | - Marta Gutiérrez-Rodríguez
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
- PTI-Global Health CSIC, Juan de la Cierva 3, 28006, Madrid, Spain
| | - Rosario Herranz
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
| | - Chiara Burgio
- Departamento de Bioquímica y Biología Molecular II, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071, Granada, Spain
| | - Antonio Reinoso
- Departamento de Bioquímica y Biología Molecular II, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071, Granada, Spain
| | - Juan M Cuerva
- Departamento de Química Orgánica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva, 18071, Granada, Spain
| | - Angel Orte
- Nanoscopy-UGR Laboratory. Departamento de Fisicoquímica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071, Granada, Spain
| | - Juan A González-Vera
- Nanoscopy-UGR Laboratory. Departamento de Fisicoquímica, Unidad de Excelencia de Química Aplicada a Biomedicina y Medioambiente, Facultad de Farmacia, Universidad de Granada, Campus Cartuja, 18071, Granada, Spain
- Instituto de Química Médica (IQM-CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
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3
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Keller AP, Huemer M, Chang CC, Mairpady Shambat S, Bjurnemark C, Oberortner N, Santschi MV, Zinsli LV, Röhrig C, Sobieraj AM, Shen Y, Eichenseher F, Zinkernagel AS, Loessner MJ, Schmelcher M. Systemic application of bone-targeting peptidoglycan hydrolases as a novel treatment approach for staphylococcal bone infection. mBio 2023; 14:e0183023. [PMID: 37768041 PMCID: PMC10653945 DOI: 10.1128/mbio.01830-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 08/08/2023] [Indexed: 09/29/2023] Open
Abstract
IMPORTANCE The rising prevalence of antimicrobial resistance in S. aureus has rendered treatment of staphylococcal infections increasingly difficult, making the discovery of alternative treatment options a high priority. Peptidoglycan hydrolases, a diverse group of bacteriolytic enzymes, show high promise as such alternatives due to their rapid and specific lysis of bacterial cells, independent of antibiotic resistance profiles. However, using these enzymes for the systemic treatment of local infections, such as osteomyelitis foci, needs improvement, as the therapeutic distributes throughout the whole host, resulting in low concentrations at the actual infection site. In addition, the occurrence of intracellularly persisting bacteria can lead to relapsing infections. Here, we describe an approach using tissue-targeting to increase the local concentration of therapeutic enzymes in the infected bone. The enzymes were modified with a short targeting moiety that mediated accumulation of the therapeutic in osteoblasts and additionally enables targeting of intracellularly surviving bacteria.
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Affiliation(s)
- Anja P. Keller
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Markus Huemer
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Chun-Chi Chang
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Srikanth Mairpady Shambat
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | | | - Nicole Oberortner
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | | | - Léa V. Zinsli
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Christian Röhrig
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Anna M. Sobieraj
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Yang Shen
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Fritz Eichenseher
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Annelies S. Zinkernagel
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Martin J. Loessner
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Mathias Schmelcher
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
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Gonzalez-Garcia MC, Garcia-Fernandez E, Hueso JL, Paulo PMR, Orte A. Optical Binding-Driven Micropatterning and Photosculpting with Silver Nanorods. SMALL METHODS 2023; 7:e2300076. [PMID: 37226694 DOI: 10.1002/smtd.202300076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 04/08/2023] [Indexed: 05/26/2023]
Abstract
Controlling the nano- and micropatterning of metal structures is an important requirement for various technological applications in photonics and biosensing. This work presents a method for controllably creating silver micropatterns by laser-induced photosculpting. Photosculpting is driven by plasmonic interactions between pulsed laser radiation and silver nanorods (AgNRs) in aqueous suspension; this process leads to optical binding forces transporting the AgNRs in the surroundings, while electronic thermalization results in photooxidation, melting, and ripening of the AgNRs into well-defined 3D structures. This work call these structures Airy castles due to their structural similarity with a diffraction-limited Airy disk. The photosculpted Airy castles contain emissive Ag nanoclusters, allowing for the visualization and examination of the aggregation process using luminescence microscopy. This work comprehensively examines the factors that define the photosculpting process, namely, the concentration and shape of the AgNRs, as well as the energy, power, and repetition rate of the laser. Finally, this work investigates the potential applications by measuring the metal-enhanced luminescence of a europium-based luminophore using Airy castles.
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Affiliation(s)
- M Carmen Gonzalez-Garcia
- Nanoscopy-UGR Laboratory, Departamento de Fisicoquímica, University of Granada, Campus Cartuja, 18071, Granada, Spain
| | - Emilio Garcia-Fernandez
- Nanoscopy-UGR Laboratory, Departamento de Fisicoquímica, University of Granada, Campus Cartuja, 18071, Granada, Spain
| | - Jose L Hueso
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Campus Rio Ebro, 50018, Zaragoza, Spain
- Department of Chemical and Environmental Engineering, University of Zaragoza, Campus Rio Ebro, 50018, Zaragoza, Spain
- Networking Res. Center in Biomaterials, Bioengineering and Nanomedicine (CIBER-BBN), Instituto de Salud Carlos III, 28029, Madrid, Spain
| | - Pedro M R Paulo
- Centro de Química Estrutural, Institute of Molecular Sciences, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal
| | - Angel Orte
- Nanoscopy-UGR Laboratory, Departamento de Fisicoquímica, University of Granada, Campus Cartuja, 18071, Granada, Spain
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5
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Černila M, Logar M, Možina H, Osredkar J. Comparison between the Sofia SARS Antigen FIA Test and the PCR Test in Detection of SARS-CoV-2 Infection. Lab Med 2023; 54:e44-e48. [PMID: 35976956 PMCID: PMC9452091 DOI: 10.1093/labmed/lmac079] [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] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE The purpose of this study was to compare Quidel's rapid antigen test Sofia SARS antigen Fluorescent Immunoassay (FIA) (Sofia) with the real-time reverse transcription-polymerase chain reaction (rRT-PCR) test. METHODS Two samples were taken from each test subject-1 for testing with the Sofia test and 1 for testing with the rRT-PCR test. In total, swabs were taken from 146 subjects who presented symptoms of infection (group 1) and 672 subjects who were tested regardless of symptoms (group 2). RESULTS In group 1, the sensitivity of the antigen test was 90.0% and its specificity 97.5%. In group 2, however, the sensitivity of the antigen test was 81.4% and the specificity 98.9%. In addition to asymptomatic patients, false-negative results of rapid antigen tests also occurred in subjects with high threshold values (cycle threshold > 30). CONCLUSION Our results show that the Sofia test meets the standards for diagnostic tests according to the criteria of the World Health Organization, as they show high sensitivity and specificity, and perhaps most importantly, a high negative predictive value (> 95%).
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Affiliation(s)
- Manca Černila
- Institute of Clinical Chemistry and Biochemistry, University Medical Centre Ljubljana, LjubljanaSlovenia.,Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
| | - Mateja Logar
- Department of Infectious Diseases, Department for Hospital Hygiene, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Hugon Možina
- Internist First Aid, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Joško Osredkar
- Institute of Clinical Chemistry and Biochemistry, University Medical Centre Ljubljana, LjubljanaSlovenia.,Faculty of Pharmacy, University of Ljubljana, Ljubljana, Slovenia
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6
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Dinga DK, Kasprzycka E, Assunção IP, Winterstein F, Alizade A, Caliskanyürek V, Blödorn D, Winkle J, Kynast U, Lezhnina M. High brightness red emitting polymer beads for immunoassays: Comparison between trifluoroacetylacetonates of Europium. Front Chem 2023; 11:1179247. [PMID: 37153529 PMCID: PMC10157089 DOI: 10.3389/fchem.2023.1179247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 04/04/2023] [Indexed: 05/09/2023] Open
Abstract
Efficiently luminescing spherical polymer particles (beads) in the nanoscale regime of up to approximately 250 nm have become very valuable tools in bioanalytical assays. Eu3+- complexes imbedded in polymethacrylate and polystyrene in particular proved to be extraordinarily useful in sensitive immunochemical and multi-analyte assays, and histo- and cytochemistry. Their obvious advantages derive from both, the possibility to realize very high ratios of emitter complexes to target molecules, and the intrinsically long decay times of the Eu3+-complexes, which allows an almost complete discrimination against bothersome autofluorescence via time-gated measuring techniques; the narrow line emission in conjunction with large apparent Stokes shifts are additional benefits with regard to spectral separation of excitation and emission with optical filters. Last but not least, a reasonable strategy to couple the beads to the analytes is mandatory. We have thus screened a variety of complexes and ancillary ligands; the four most promising candidates evaluated and compared to each other were β-diketonates (trifluoroacetylacetonates, R-CO-CH-CO-CF3, R = - thienyl, -phenyl, -naphthyl and -phenanthryl); highest solubilities in polystyrene were obtained with trioctylphosphine co-ligands. All beads had overall quantum yields in excess of 80% as dried powders and lifetimes well beyond 600 µs. Core-shell particles were devised for the conjugation to model proteins (Avidine, Neutravidine). Their applicability was tested in biotinylated titer plates using time gated measurements and a Lateral Flow Assay as practical examples.
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Affiliation(s)
- Daniel K. Dinga
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | - Ewa Kasprzycka
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | - Israel P. Assunção
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | - Franziska Winterstein
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | - Amina Alizade
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | - Volkan Caliskanyürek
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
| | | | | | - Ulrich Kynast
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
- *Correspondence: Marina Lezhnina, ; Ulrich Kynast,
| | - Marina Lezhnina
- Institute for Optical Technologies, Münster University of Applied Sciences, Steinfurt, Germany
- Quantum Analysis GmbH, Münster, Germany
- *Correspondence: Marina Lezhnina, ; Ulrich Kynast,
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7
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Martinon TLM, Pierre VC. Luminescent Lanthanide Probes for Inorganic and Organic Phosphates. Chem Asian J 2022; 17:e202200495. [PMID: 35750633 PMCID: PMC9388549 DOI: 10.1002/asia.202200495] [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: 05/13/2022] [Revised: 06/19/2022] [Indexed: 11/09/2022]
Abstract
Inorganic and organic phosphates-including orthophosphate, nucleotides, and DNA-are some of the most fundamental anions in cellular biology, regulating numerous processes of both medical and environmental significance. The characteristic long lifetimes of emitting lanthanides, including the brighter europium(III) and terbium(III), make them ideally suited for the development of molecular probes for the detection of phosphates directly in complex aqueous media. Moreover, given their high oxophilicity and the exquisite sensitivity of their quantum yields to their hydration number, those luminescent lanthanides are perfect for the detection of phosphates. Herein we discuss the principles that have guided the recent developments of molecular probes selective for inorganic or organic phosphates and how these lanthanide complexes facilitate the study of numerous biological processes.
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Affiliation(s)
- Thibaut L M Martinon
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA
| | - Valérie C Pierre
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA
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8
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Pham H, Miller LW. Lanthanide-based resonance energy transfer biosensors for live-cell applications. Methods Enzymol 2021; 651:291-311. [PMID: 33888207 DOI: 10.1016/bs.mie.2021.01.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Lanthanide-based, Förster resonance energy transfer (LRET) biosensors enable sensitive, time-gated luminescence (TGL) imaging or multiwell plate analysis of protein-protein interactions (PPIs) in living mammalian cells. LRET biosensors are polypeptides that consist of an alpha-helical linker sequence sandwiched between a lanthanide complex-binding domain and a fluorescent protein (FP) with two interacting domains residing at each terminus. Interaction between the terminal affinity domains brings the lanthanide complex and FP in close proximity such that lanthanide-to-FP, LRET-sensitized emission is increased. A recent proof-of-concept study examined model biosensors that incorporated the affinity partners FKBP12 and the rapamycin-binding domain of m-Tor (FRB) as well as p53 (1-92) and HDM2 (1-128). The sensors contained an Escherichia coli dihydrofolate reductase (eDHFR) domain that binds with high selectivity and affinity to Tb(III) complexes coupled to the ligand trimethoprim (TMP). When cell lines that stably expressed the sensors were treated with TMP-Tb(III), TGL microscopy revealed dramatic differences (>500%) in donor- or acceptor-denominated, Tb(III)-to-GFP LRET ratios between open (unbound) and closed (bound) states of the biosensors. Much larger signal changes (>2500%) and Z'-factors of 0.5 or more were observed when cells were grown in 96-well or 384-well plates and analyzed using a TGL plate reader. In this chapter, we elaborate on the design and performance of LRET biosensors and provide detailed protocols to guide their use for live-cell microscopic imaging studies and high-throughput library screening.
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Affiliation(s)
- Ha Pham
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States
| | - Lawrence W Miller
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, United States.
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Photophysical, DFT and molecular docking studies of Sm(III) and Eu(III) complexes of newly synthesized coumarin ligand. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.108213] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10
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Lee W, Jeon M, Choi J, Oh C, Kim G, Jung S, Kim C, Ye SJ, Im HJ. Europium-Diethylenetriaminepentaacetic Acid Loaded Radioluminescence Liposome Nanoplatform for Effective Radioisotope-Mediated Photodynamic Therapy. ACS NANO 2020; 14:13004-13015. [PMID: 32820903 DOI: 10.1021/acsnano.0c04324] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Photodynamic therapy (PDT) is an effective anticancer strategy with a higher selectivity and fewer adverse effects than conventional therapies; however, shallow tissue penetration depth of light has hampered the clinical utility of PDT. Recently, reports have indicated that Cerenkov luminescence-induced PDT may overcome the tissue penetration limitation of conventional PDT. However, the effectiveness of this method is controversial because of its low luminescence intensity. Herein, we developed a radiolabeled diethylenetriaminepentaacetic acid chelated Eu3+ (Eu-DTPA)/photosensitizer (PS) loaded liposome (Eu/PS-lipo) that utilizes ionizing radiation from radioisotopes for effective in vivo imaging and radioluminescence-induced PDT. We utilized Victoria blue-BO (VBBO) as a PS and observed an efficient luminescence resonance energy transfer between Eu-DTPA and VBBO. Furthermore, 64Cu-labeled Eu lipo demonstrated a strong radioluminescence with a 2-fold higher intensity than Cerenkov luminescence from free 64Cu. In our radioluminescence liposome, radioluminescence energy transfer showed a 6-fold higher energy transfer efficiency to VBBO than Cerenkov luminescence energy transfer (CLET). 64Cu-labeled Eu/VBBO lipo (64Cu-Eu/VBBO lipo) showed a substantial tumor uptake of up to 19.3%ID/g by enhanced permeability and retention effects, as revealed by in vivo positron emission tomography. Finally, the PDT using 64Cu-Eu/VBBO lipo demonstrated significantly higher in vitro and in vivo therapeutic effects than Cerenkov luminescence-induced PDT using 64Cu-VBBO lipo. This study envisions a great opportunity for clinical PDT application by establishing the radioluminescence liposome which has high tumor targeting and efficient energy transfer capability from radioisotopes.
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Affiliation(s)
- Wooseung Lee
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Miyeon Jeon
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Jinyeong Choi
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Chiwoo Oh
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Gaeun Kim
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Seongmoon Jung
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
- Department of Radiation Oncology, Seoul National University Hospital, Seoul 03080, Republic of Korea
| | - Changsoon Kim
- Department of Intelligence and Information, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
- Inter-University Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea
| | - Sung-Joon Ye
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyung-Jun Im
- Department of Applied Bioengineering, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea
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Engineering of Long-Circulating Peptidoglycan Hydrolases Enables Efficient Treatment of Systemic Staphylococcus aureus Infection. mBio 2020; 11:mBio.01781-20. [PMID: 32963004 PMCID: PMC7512550 DOI: 10.1128/mbio.01781-20] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Staphylococcus aureus is a human pathogen causing life-threatening diseases. The increasing prevalence of multidrug-resistant S. aureus infections is a global health concern, requiring development of novel therapeutic options. Peptidoglycan-degrading enzymes (peptidoglycan hydrolases, PGHs) have emerged as a highly effective class of antimicrobial proteins against S. aureus and other pathogens. When applied to Gram-positive bacteria, PGHs hydrolyze bonds within the peptidoglycan layer, leading to rapid bacterial death by lysis. This activity is highly specific and independent of the metabolic activity of the cell or its antibiotic resistance patterns. However, systemic application of PGHs is limited by their often low activity in vivo and by an insufficient serum circulation half-life. To address this problem, we aimed to extend the half-life of PGHs selected for high activity against S. aureus in human serum. Half-life extension and increased serum circulation were achieved through fusion of PGHs to an albumin-binding domain (ABD), resulting in high-affinity recruitment of human serum albumin and formation of large protein complexes. Importantly, the ABD-fused PGHs maintained high killing activity against multiple drug-resistant S. aureus strains, as determined by ex vivo testing in human blood. The top candidate, termed ABD_M23, was tested in vivo to treat S. aureus-induced murine bacteremia. Our findings demonstrate a significantly higher efficacy of ABD_M23 than of the parental M23 enzyme. We conclude that fusion with ABD represents a powerful approach for half-life extension of PGHs, expanding the therapeutic potential of these enzybiotics for treatment of multidrug-resistant bacterial infections.IMPORTANCE Life-threatening infections with Staphylococcus aureus are often difficult to treat due to the increasing prevalence of antibiotic-resistant bacteria and their ability to persist in protected niches in the body. Bacteriolytic enzymes are promising new antimicrobials because they rapidly kill bacteria, including drug-resistant and persisting cells, by destroying their cell wall. However, when injected into the bloodstream, these enzymes are not retained long enough to clear an infection. Here, we describe a modification to increase blood circulation time of the enzymes and enhance treatment efficacy against S. aureus-induced bloodstream infections. This was achieved by preselecting enzyme candidates for high activity in human blood and coupling them to serum albumin, thereby preventing their elimination by kidney filtration and blood vessel cells.
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Cho U, Chen JK. Lanthanide-Based Optical Probes of Biological Systems. Cell Chem Biol 2020; 27:921-936. [PMID: 32735780 DOI: 10.1016/j.chembiol.2020.07.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 06/28/2020] [Accepted: 07/10/2020] [Indexed: 02/06/2023]
Abstract
The unique photophysical properties of lanthanides, such as europium, terbium, and ytterbium, make them versatile molecular probes of biological systems. In particular, their long-lived photoluminescence, narrow bandwidth emissions, and large Stokes shifts enable experiments that are infeasible with organic fluorophores and fluorescent proteins. The ability of these metal ions to undergo luminescence resonance energy transfer, and photon upconversion further expands the capabilities of lanthanide probes. In this review, we describe recent advances in the design of lanthanide luminophores and their application in biological research. We also summarize the latest detection systems that have been developed to fully exploit the optical properties of lanthanide luminophores. We conclude with a discussion of remaining challenges and new frontiers in lanthanide technologies. The unprecedented levels of sensitivity and multiplexing afforded by rare-earth elements illustrate how chemistry can enable new approaches in biology.
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Affiliation(s)
- Ukrae Cho
- Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA.
| | - James K Chen
- Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA; Department of Developmental Biology, Stanford University, Stanford, CA 94305, USA; Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
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13
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Yang S, Guo Z, Hu Z, Guo D. Novel intramolecular charge transfer effect-based ligands and aggregation-induced emission-active europium complexes: synthesis, characterization, and fluorescence properties. LUMINESCENCE 2020; 36:306-315. [PMID: 32725662 DOI: 10.1002/bio.3925] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 07/16/2020] [Accepted: 07/24/2020] [Indexed: 01/17/2023]
Abstract
Two novel coumarin derivatives and the corresponding europium complexes were prepared using a simple procedure. The pH response of the ligand and the aggregation-induced emission (AIE) properties of the target europium complex were studied. The ligand had an intramolecular charge transfer (ICT) effect and was linearly and sharply responsive under acidic conditions. The goal europium complexes exhibited excellent AIE performance when subjected to increasing concentrations of target europium complex or proportion of poor solvent. The effect of substituents on fluorescence strength or thermogravimetric and electrochemical properties was further investigated. The target complexes displayed the typical fluorescence of europium. The fluorescence amplitude of the target europium complexes was enhanced by the addition of electron-donating groups to ligands. Thermogravimetric research findings indicated that the target complexes possessed extreme thermal stability. Electrochemistry discovery findings indicated that the highest occupied molecular orbit energy level of EuL1 was greater than EuL2 , but the lowest unoccupied molecular orbit energy level was smaller than that of EuL2 . These complexes could be applied in medicinal chemistry, substance chemistry, and fluorescence labelling areas.
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Affiliation(s)
- Shuaishuai Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China
| | - Zuping Guo
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China
| | - Zhongqian Hu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China
| | - Dongcai Guo
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China
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14
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Röhrig C, Huemer M, Lorgé D, Luterbacher S, Phothaworn P, Schefer C, Sobieraj AM, Zinsli LV, Mairpady Shambat S, Leimer N, Keller AP, Eichenseher F, Shen Y, Korbsrisate S, Zinkernagel AS, Loessner MJ, Schmelcher M. Targeting Hidden Pathogens: Cell-Penetrating Enzybiotics Eradicate Intracellular Drug-Resistant Staphylococcus aureus. mBio 2020; 11:e00209-20. [PMID: 32291298 PMCID: PMC7157818 DOI: 10.1128/mbio.00209-20] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 03/17/2020] [Indexed: 01/21/2023] Open
Abstract
Staphylococcus aureus is a major concern in human health care, mostly due to the increasing prevalence of antibiotic resistance. Intracellular localization of S. aureus plays a key role in recurrent infections by protecting the pathogens from antibiotics and immune responses. Peptidoglycan hydrolases (PGHs) are highly specific bactericidal enzymes active against both drug-sensitive and -resistant bacteria. However, PGHs able to effectively target intracellular S. aureus are not yet available. To overcome this limitation, we first screened 322 recombineered PGHs for staphylolytic activity under conditions found inside eukaryotic intracellular compartments. The most active constructs were modified by fusion to different cell-penetrating peptides (CPPs), resulting in increased uptake and enhanced intracellular killing (reduction by up to 4.5 log units) of various S. aureus strains (including methicillin-resistant S. aureus [MRSA]) in different tissue culture infection models. The combined application of synergistic PGH-CPP constructs further enhanced their intracellular efficacy. Finally, synergistically active PGH-CPP cocktails reduced the total S. aureus by more than 2.2 log units in a murine abscess model after peripheral injection. Significantly more intracellular bacteria were killed by the PGH-CPPs than by the PGHs alone. Collectively, our findings show that CPP-fused PGHs are effective novel protein therapeutics against both intracellular and drug-resistant S. aureusIMPORTANCE The increasing prevalence of antibiotic-resistant bacteria is one of the most urgent problems of our time. Staphylococcus aureus is an important human pathogen that has acquired several mechanisms to evade antibiotic treatment. In addition, S. aureus is able to invade and persist within human cells, hiding from the immune response and antibiotic therapies. For these reasons, novel antibacterial strategies against these pathogens are needed. Here, we developed lytic enzymes which are able to effectively target drug-resistant and intracellular S. aureus Fusion of these so-called enzybiotics to cell-penetrating peptides enhanced their uptake and intracellular bactericidal activity in cell culture and in an abscess mouse model. Our results suggest that cell-penetrating enzybiotics are a promising new class of therapeutics against staphylococcal infections.
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Affiliation(s)
- Christian Röhrig
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Markus Huemer
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Dominique Lorgé
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Samuel Luterbacher
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Preeda Phothaworn
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | - Anna M Sobieraj
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Léa V Zinsli
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Srikanth Mairpady Shambat
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Nadja Leimer
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Anja P Keller
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Fritz Eichenseher
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Yang Shen
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Sunee Korbsrisate
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Annelies S Zinkernagel
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Martin J Loessner
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
| | - Mathias Schmelcher
- Institute of Food, Nutrition and Health, ETH Zurich, Zurich, Switzerland
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16
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Liu Q, Cai P, Wan X, Zhang S, Du K, Yin Q. Neodymium ternary complexes with 2,4,6-tri(2-pyridyl)-1,3,5-triazine: Synthesis, crystal structure and fluorescence property. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Ultrasensitive optical imaging with lanthanide lumiphores. Nat Chem Biol 2017; 14:15-21. [PMID: 29106397 PMCID: PMC5726931 DOI: 10.1038/nchembio.2513] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 10/02/2017] [Indexed: 11/12/2022]
Abstract
In principle, the millisecond emission lifetimes of lanthanide chelates should enable their ultrasensitive detection in biological systems by time-resolved optical microscopy. In practice, however, lanthanide imaging techniques have provided no better sensitivity than conventional fluorescence microscopy. Here, we identify three fundamental problems that have impeded lanthanide microscopy: low photon flux, inefficient excitation, and optics-derived background luminescence. We overcome these limitations with a new lanthanide imaging modality, trans-reflected illumination with luminescence resonance energy transfer (trLRET), which increases the time-integrated signal intensities of lanthanide lumiphores by 170-fold and the signal-to-background ratios by 75-fold. We demonstrate that trLRET provides at least an order-of-magnitude increase in detection sensitivity over conventional epifluorescence microscopy when used to visualize endogenous protein expression in zebrafish embryos. We also show that trLRET can be used to optically detect molecular interactions in vivo. trLRET promises to unlock the full potential of lanthanide lumiphores for ultrasensitive, autofluorescence-free biological imaging.
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18
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Kim KR, Han YD, Chun HJ, Lee KW, Hong DK, Lee KN, C Yoon H. Encapsulation-Stabilized, Europium Containing Nanoparticle as a Probe for Time-Resolved luminescence Detection of Cardiac Troponin I. BIOSENSORS 2017; 7:E48. [PMID: 29057816 PMCID: PMC5746771 DOI: 10.3390/bios7040048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 10/07/2017] [Accepted: 10/16/2017] [Indexed: 12/17/2022]
Abstract
The use of a robust optical signaling probe with a high signal-to-noise ratio is important in the development of immunoassays. Lanthanide chelates are a promising material for this purpose, which provide time-resolved luminescence (TRL) due to their large Stokes shift and long luminescence lifetime. From this, they have attracted considerable interest in the in vitro diagnostics field. However, the direct use of lanthanide chelates is limited because their luminescent signal can be easily affected by various quenchers. To overcome this drawback, strategies that rely on the entrapment of lanthanide chelates inside nanoparticles, thereby enabling the protection of the lanthanide chelate from water, have been reported. However, the poor stability of the lanthanide-entrapped nanoparticles results in a significant fluctuation in TRL signal intensity, and this still remains a challenging issue. To address this, we have developed a Lanthanide chelate-Encapsulated Silica Nano Particle (LESNP) as a new immunosensing probe. In this approach, the lanthanide chelate is covalently crosslinked within the silane monomer during the silica nanoparticle formation. The resulting LESNP is physically stable and retains TRL properties of the parent lanthanide chelate. Using the probe, a highly sensitive, sandwich-based TRL immunoassay for the cardiac troponin I was conducted, exhibiting a limit of detection of 48 pg/mL. On the basis of the features of the LESNP such as TRL signaling capability, stability, and the ease of biofunctionalization, we expect that the LESNP can be widely applied in the development of TRL-based immunosensing.
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Affiliation(s)
- Ka Ram Kim
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Yong Duk Han
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Hyeong Jin Chun
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Kyung Won Lee
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Dong-Ki Hong
- Korea Electronics Technology Institute, Seongnam 13509, Korea.
| | - Kook-Nyung Lee
- Korea Electronics Technology Institute, Seongnam 13509, Korea.
| | - Hyun C Yoon
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
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Faschinger F, Ertl M, Zimmermann M, Horner A, Himmelsbach M, Schöfberger W, Knör G, Gruber HJ. Stable Europium(III) Complexes with Short Linkers for Site-Specific Labeling of Biomolecules. ChemistryOpen 2017; 6:721-732. [PMID: 29226060 PMCID: PMC5715356 DOI: 10.1002/open.201700122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Indexed: 02/02/2023] Open
Abstract
In this study, two new terpyridine-based EuIII complexes were synthesized, the structures of which were optimized for luminescence resonance energy-transfer (LRET) experiments. The complexes showed high quantum yields (32 %); a single long lifetime (1.25 ms), which was not influenced by coupling to protein; very high stability in the presence of chelators such as ethylenediamine-N,N,N',N'-tetraacetate and ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid; and no interaction with cofactors such as adenosine triphosphate and guanosine triphosphate. A special feature is the short length of the linker between the EuIII ion and the maleimide or hydrazide function, which allows for site-specific coupling of cysteine mutants or unnatural keto amino acids. As a consequence, the new complexes appear particularly suited for accurate distance measurements in biomolecules by LRET.
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Affiliation(s)
- Felix Faschinger
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Martin Ertl
- Institute of Inorganic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Mirjam Zimmermann
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Andreas Horner
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Markus Himmelsbach
- Institute for Analytical ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Wolfgang Schöfberger
- Institute of Organic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Günther Knör
- Institute of Inorganic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Hermann J. Gruber
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
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20
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Goncharova LA, Kobylinska NG, Díaz-Garcia ME, Zaitsev VN. Solid-phase luminescence determination of tetracycline in bottled water using chemically modified silica. JOURNAL OF ANALYTICAL CHEMISTRY 2017. [DOI: 10.1134/s106193481707005x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Schmued L, Raymick J. Introducing Euro-Glo, a rare earth metal chelate with numerous applications for the fluorescent localization of myelin and amyloid plaques in brain tissue sections. J Neurosci Methods 2017; 279:79-86. [PMID: 27939963 DOI: 10.1016/j.jneumeth.2016.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/01/2016] [Accepted: 12/03/2016] [Indexed: 11/19/2022]
Abstract
The vast majority of fluorochromes are organic in nature and none of the few existing chelates have been applied as histological tracers for localizing brain anatomy and pathology. NEW METHOD In this study we have developed and characterized a Europium chelate with the ability to fluorescently label normal and pathological myelin in control and toxicant-exposed rats, as well as the amyloid plaques in aged AD/Tg mice. RESULTS This study demonstrates how Euro-Glo can be used for the detailed labeling of both normal myelination in the control rat as well as myelin pathology in the kainic acid exposed rat. In addition, this study demonstrates how E-G will label the shell of amyloid plaques in an AD/Tg mouse model of Alzheimer's disease a red color, while the plaque core appears blue in color. The observed E-G staining pattern is compared with that of well characterized tracers specific for the localization of myelin (Black-Gold II), degenerating neurons (Fluoro-Jade C), A-beta aggregates (Amylo-Glo) and glycolipids (PAS). COMPARISONS WITH EXISTING METHODS This study represents the first time a rare earth metal (REM) chelate has been used as a histochemical tracer in the brain. This novel tracer, Euro-Glo (E-G), exhibits numerous advantages over conventional organic fluorophores including high intensity emission, high resistance to fading, compatibility with multiple labeling protocols, high Stoke's shift value and an absence of bleed-through of the signal through other filters. CONCLUSIONS Euro-Glo represents the first fluorescent metal chelate to be used as a histochemical tracer, specifically to localize normal and pathological myelin as well as amyloid plaques.
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Affiliation(s)
- Larry Schmued
- National Center for Toxicological Research, Food and Drug Administration, 3900 NCTR Rd Jefferson AR, 72079, United States.
| | - James Raymick
- National Center for Toxicological Research, Food and Drug Administration, 3900 NCTR Rd Jefferson AR, 72079, United States.
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22
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Zhang D, Gao B, Li Y. Synthesis and luminescence properties of polymer-rare earth complexes containing salicylaldehyde-type bidentate Schiff base ligand. LUMINESCENCE 2017; 32:855-865. [DOI: 10.1002/bio.3264] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 11/06/2016] [Accepted: 11/13/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Dandan Zhang
- Department of Chemical Engineering; North University of China; Taiyuan People's Republic of China
| | - Baojiao Gao
- Department of Chemical Engineering; North University of China; Taiyuan People's Republic of China
| | - Yanbin Li
- Department of Chemical Engineering; North University of China; Taiyuan People's Republic of China
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23
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Podyachev SN, Sudakova SN, Gimazetdinova GS, Shamsutdinova NA, Syakaev VV, Barsukova TA, Iki N, Lapaev DV, Mustafina AR. Synthesis, metal binding and spectral properties of novel bis-1,3-diketone calix[4]arenes. NEW J CHEM 2017. [DOI: 10.1039/c6nj03381d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Novel bis-1,3-diketone calix[4]arenes provide good antenna effects on Tb3+- and Yb3+-centered luminescence.
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Affiliation(s)
- Sergey N. Podyachev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Svetlana N. Sudakova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | | | - Nataliya A. Shamsutdinova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Victor V. Syakaev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Tatjiana A. Barsukova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Nobuhiko Iki
- Graduate School of Environmental Studies
- Tohoku University
- Sendai 980-8579
- Japan
| | - Dmitry V. Lapaev
- Zavoisky Physical-Technical Institute of Kazan Scientific Center of Russian Academy of Sciences
- 420029 Kazan
- Russia
| | - Asiya R. Mustafina
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
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Chu LF, Shi Y, Xu DF, Yu H, Lin JR, He QZ. Synthesis and Biological Studies of Some Lanthanide Complexes of Schiff Base. ACTA ACUST UNITED AC 2015. [DOI: 10.1080/15533174.2015.1031048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Lian-Feng Chu
- Key Laboratory of Resource Chemistry of Ministry of Education, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, P. R. China
| | - Yang Shi
- Key Laboratory of Resource Chemistry of Ministry of Education, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, P. R. China
| | - Dong-Fang Xu
- Key Laboratory of Resource Chemistry of Ministry of Education, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, P. R. China
| | - Hui Yu
- Interdisciplinary Research Centre, Shanghai Normal University, Shanghai, P. R. China
| | - Jin-Rong Lin
- Key Laboratory of Resource Chemistry of Ministry of Education, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, P. R. China
| | - Qi-Zuang He
- Key Laboratory of Resource Chemistry of Ministry of Education, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, P. R. China
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Kang J, Chen YN, Wang AL, Li HY, Qu YR, Zhang HX, Chu HB, Zhao YL. Synthesis, characterization and luminescent properties of europium complexes with 2,4,6-tris-(2-pyridyl)-s-triazine as highly efficient sensitizers. LUMINESCENCE 2015; 30:1360-6. [DOI: 10.1002/bio.2906] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Revised: 01/30/2015] [Accepted: 02/26/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Jie Kang
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Ying-Nan Chen
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Ai-Ling Wang
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Hai-Yan Li
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Yan-Rong Qu
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Hai-Xia Zhang
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Hai-Bin Chu
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
| | - Yong-Liang Zhao
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Huhhot China
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26
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Feng X, Feng YQ, Chen JJ, Ng SW, Wang LY, Guo JZ. Reticular three-dimensional 3d–4f frameworks constructed through substituted imidazole-dicarboxylate: syntheses, luminescence and magnetic properties study. Dalton Trans 2015; 44:804-16. [DOI: 10.1039/c4dt02047b] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Series of heteronuclear metal organic frameworks (HMOF) combination of lanthanide and Zn/Co ions based on a rigid substituted imidazoledicarboxylic acid ligand have been successfully isolated and characterized systematically.
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Affiliation(s)
- Xun Feng
- College of Chemistry and Chemical Engineering
- Luoyang Normal University
- Luoyang
- P. R. China
| | - Yu-Quan Feng
- College of Chemistry and Pharmacy Engineering
- Nanyang Normal University
- Nanyang
- P. R. China
| | - Jun Jing Chen
- College of Chemistry and Pharmacy Engineering
- Nanyang Normal University
- Nanyang
- P. R. China
| | - Seik-Weng Ng
- Department of chemistry
- University of Malaya
- Kuala Lumpur
- Malaysia
| | - Li-Ya Wang
- College of Chemistry and Chemical Engineering
- Luoyang Normal University
- Luoyang
- P. R. China
- College of Chemistry and Pharmacy Engineering
| | - Jin-Zhong Guo
- College of Chemistry and Chemical Engineering
- Luoyang Normal University
- Luoyang
- P. R. China
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27
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Muravev AA, Burilov VA, Solov’eva SE, Strel’nik AG, Latypov SK, Bazanova OB, Sharafutdinova DR, Antipin IS, Konovalov AI. Synthesis and fluorescent properties of thiacalix[4]arenes containing terpyridyl fragments at the lower rim. Russ Chem Bull 2014. [DOI: 10.1007/s11172-014-0416-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Li WX, Xin XD, Feng SY, Liu Y, Zhang J, Ao BY, Li YJ. Fluorescence enhancement of europium (III) perchlorate by 1,10-phenanthroline on the 1-(naphthalen-2-yl)-2-(phenylsulthio)ethanone complex and luminescence mechanism. LUMINESCENCE 2014; 29:810-7. [DOI: 10.1002/bio.2625] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 10/22/2013] [Accepted: 11/22/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Wen-Xian Li
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Xiao-Dong Xin
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Shu-Yan Feng
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Yu Liu
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Jing Zhang
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Bo-Yang Ao
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
| | - Ying-Jie Li
- College of Chemistry and Chemical Engineering; Inner Mongolia University; Hohhot 010021 People's Republic of China
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29
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Feng SY, Li WX, Guo F, Cao XF. Luminescence enhancement of terbium(III) perchlorate by 2,2'-dipyridyl on bis(benzylsulfinyl)methane complex and luminescence mechanism. LUMINESCENCE 2014; 29:791-7. [PMID: 24395674 DOI: 10.1002/bio.2622] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 10/22/2013] [Accepted: 11/21/2013] [Indexed: 11/06/2022]
Abstract
A novel ternary complex, Tb(2)L4 · L'·(ClO4)6 · 8H2O, has been synthesized using bis(benzylsulfinyl)methane as the first ligand L and 2,2'-dipyridyl as the second ligand L'. The ternary complex was characterized by element analysis, molar conductivity, coordination titration analysis, infrared, thermogravimetric-differential scanning calorimetric and ultraviolet spectra. The results indicated that the composition of the complex was Tb2 L4 · L'·(ClO4)6 · 8H2O (L = C(6)H(5)CH(2) SOCH(2)SOCH(2)C(6)H(5); L' = Dipy). Fourier transform infrared results revealed that the perchlorate group was bonded with the Tb(III) ion by the oxygen atom, and the coordination was bidentate. The fluorescent spectra illustrated that the complex displayed characteristic fluorescence in the solid state. After the introduction of the second ligand, 2,2-dipyridyl, the relative emission intensity and fluorescence lifetime of the ternary complex Tb(2)L(4) · L'·(ClO(4))(6) · 8H2O were enhanced compared to the binary complex TbL(2.5)(ClO4)3 · 3H2O. This indicated that the presence of both organic ligand bis(benzylsulfinyl)methane and the second ligand 2,2-dipyridyl could sensitize the fluorescence intensity of Tb(III) ion, and introduction of the 2,2-dipyridyl group resulted in an enhancement of the fluorescence of the Tb(III) ternary rare earth complex. The strongest characteristic fluorescence emission intensity of the ternary complex was 9.36 times that of the binary complex. The phosphorescence spectra and fluorescence lifetime of the complex were also measured.
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Affiliation(s)
- Shu-Yan Feng
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, People's Republic of China
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30
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Enantioselective aggregation and luminescence properties of europium(III) and terbium(III) complexes of an acetate and a tripodal ligand containing three imidazole groups. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.04.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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31
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Gao B, Fang L, Men J. Studies on preparation, structure and fluorescence emission of polymer-rare earth complexes composed of aryl carboxylic acid-functionalized polystyrene and Tb(Ⅲ) ion. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.07.059] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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32
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New luminescent oxygen-sensing and temperature-sensing materials based on gadolinium(III) and europium(III) complexes embedded in an acridone–polystyrene conjugate. Anal Bioanal Chem 2012; 404:2797-806. [DOI: 10.1007/s00216-012-6244-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Revised: 07/01/2012] [Accepted: 07/02/2012] [Indexed: 12/19/2022]
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33
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Zhang L, Wang Y, Ye Z, Jin D, Yuan J. New Class of Tetradentate β-Diketonate-Europium Complexes That Can Be Covalently Bound to Proteins for Time-Gated Fluorometric Application. Bioconjug Chem 2012; 23:1244-51. [DOI: 10.1021/bc300075t] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Lin Zhang
- State Key Laboratory of Fine
Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yanjiao Wang
- State Key Laboratory of Fine
Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Zhiqiang Ye
- State Key Laboratory of Fine
Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
| | - Dayong Jin
- MQ Photonics Centre, Faculty
of Science, Macquarie University, NSW 2109,
Sydney, Australia
| | - Jingli Yuan
- State Key Laboratory of Fine
Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China
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34
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Synthesis, characterization and properties of some rare earth complexes with 2,6-pyridine dicarboxylic acid and α-Picolinic acid. J RARE EARTH 2012. [DOI: 10.1016/s1002-0721(12)60095-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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35
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Mantion A, Graf P, Florea I, Haase A, Thünemann AF, Mašić A, Ersen O, Rabu P, Meier W, Luch A, Taubert A. Biomimetic synthesis of chiral erbium-doped silver/peptide/silica core-shell nanoparticles (ESPN). NANOSCALE 2011; 3:5168-5179. [PMID: 22031101 DOI: 10.1039/c1nr10930h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Peptide-modified silver nanoparticles have been coated with an erbium-doped silica layer using a method inspired by silica biomineralization. Electron microscopy and small-angle X-ray scattering confirm the presence of an Ag/peptide core and silica shell. The erbium is present as small Er(2)O(3) particles in and on the silica shell. Raman, IR, UV-Vis, and circular dichroism spectroscopies show that the peptide is still present after shell formation and the nanoparticles conserve a chiral plasmon resonance. Magnetic measurements find a paramagnetic behavior. In vitro tests using a macrophage cell line model show that the resulting multicomponent nanoparticles have a low toxicity for macrophages, even on partial dissolution of the silica shell.
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Affiliation(s)
- Alexandre Mantion
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Str. 11, 12489, Berlin, Germany.
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36
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Li WX, Chai WJ, Liu Y, Li YJ, Ren T, Zhang J, Ao BY. Fluorescence enhancement of rare earth Tb(III) by Tm(III) in benzyl benzoylmethyl sulphoxide complexes. LUMINESCENCE 2011; 27:431-6. [PMID: 22114050 DOI: 10.1002/bio.1368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Revised: 09/28/2011] [Accepted: 10/07/2011] [Indexed: 11/06/2022]
Abstract
A series of rare earth complexes [(Tb(x) Tm(y))L5 (ClO4)2](ClO4)·3H(2) O (x:y = 1.000:0.000, 0.999:0.001, 0.995:0.005, 0.990:0.010, 0.950:0.050, 0.900:0.100, 0.800:0.200, 0.700:0.300; L = C(6) H5 CH2 SOCH2 COC6 H5) (Tb(III) luminescence ion; Tm(III) doped inert ion) were synthesized and characterized by elemental analysis, infrared spectra (IR) and (1) H-NMR. The photophysical properties of these complexes were studied in detail using ultraviolet absorption spectra, fluorescent spectra and lifetimes. The fluorescence spectra of complexes indicated that the fluorescence emission intensity was significantly enhanced by Tm(III). The complexes showed the best luminescence properties when the mole ratio Tb(III):Tm(III) was 0.990:0.010. The fluorescence intensity could be increased to 390%. Additionally, phosphorescence spectra and the luminescence mechanisms are discussed.
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Affiliation(s)
- Wen-Xian Li
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, People's Republic of China
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37
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Azab HA, Anwar ZM, Abdel-Salam ET, el-Sayed-Sebak M. New luminescent bioprobes Eu(lll)-phloroglucinol derivatives and their spectrofluorimetric, electrochemical interactions with nucleotides and DNA. J Fluoresc 2011; 22:223-38. [PMID: 21882084 DOI: 10.1007/s10895-011-0949-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 08/07/2011] [Indexed: 10/17/2022]
Abstract
Two new ligands derived from phloroglucinol 2-{[(4-methoxy benzoyl)oxy]} methyl benzoic acid[L1] and 2-{[(4-methyl benzoyl)oxy] methyl} benzoic acid[L2] were synthesized. The solid complex Eu(III)-L2 has been synthesised and characterized by elemental analysis, UV and IR spectra. The reaction of Eu(III) with the two synthesized ligands has been investigated in I = 0.1 mol dm(-3) p-toluene sulfonate by cyclic voltammetry and square wave voltammetry. The reaction of Eu (III)-L1 and Eu (III)-L2 binary complexes with nucleotide 5'-AMP, 5'-ADP, 5'-ATP, 5'- GMP, 5'-IMP, and 5'-CMP has been investigated using UV, fluorescence and electrochemical methods. The experimental conditions were selected such that self-association of the nucleotides and their complexes was negligibly small, that is, the monomeric complexes were studied. The interaction of the Eu(III)-L1 or L2 solid complexes with calf-thymus DNA has been investigated by fluorescence and electrochemical methods including cyclic voltammetery(CV), differential pulse polarography (DPP) and square wave voltammetry (SWV) on a glassy carbon electrode. The fluorescence intensity of Eu(III)-L2 complex was enhanced with the addition of DNA. Under optimal conditions in phosphate buffer pH 7.0 at 25 °C the linear range is 3-20 μM for calf thymus DNA (CT-DNA) and the corresponding determination limit is 1.8 μM.
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Affiliation(s)
- Hassan Ahmed Azab
- Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt.
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38
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JIU H, LIU G, ZHANG Z, FU Y, CHEN J, FAN T, ZHANG L. Fluorescence enhancement of Tb(III) complex with a new β-diketone ligand by 1,10-phenanthroline. J RARE EARTH 2011. [DOI: 10.1016/s1002-0721(10)60534-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Luminescent europium(III) complexes of tripodal heptadentate N7 ligands containing three imidazole groups. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.05.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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40
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Mizukami S, Yamamoto T, Yoshimura A, Watanabe S, Kikuchi K. Covalent protein labeling with a lanthanide complex and its application to photoluminescence lifetime-based multicolor bioimaging. Angew Chem Int Ed Engl 2011; 50:8750-2. [PMID: 21793145 DOI: 10.1002/anie.201103775] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Shin Mizukami
- Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan
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41
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Mizukami S, Yamamoto T, Yoshimura A, Watanabe S, Kikuchi K. Covalent Protein Labeling with a Lanthanide Complex and Its Application to Photoluminescence Lifetime-Based Multicolor Bioimaging. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103775] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Li WX, Zheng YS, Chai WJ, Ren T, Liu Y, Li YJ, Sun XJ, Xing GW. Fluorescence emission mechanism and fluorescence properties of ternary Tb(III) complex with diphenyl sulphoxide and bipyridine. LUMINESCENCE 2011; 26:754-61. [PMID: 21567886 DOI: 10.1002/bio.1309] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2010] [Revised: 03/22/2011] [Accepted: 03/30/2011] [Indexed: 11/09/2022]
Abstract
A novel ternary complex, TbL(5) L'(ClO(4))(3) · 3H(2)O, two binary complexes, TbL(7) (ClO(4))(3) · 3H(2)O and TbL'(3.5) (ClO(4))(3) · 4H(2)O has been synthesized (using diphenyl sulphoxide as the first ligand L, bipyridine as the second ligand L'). Their composition was analysed by element analysis, coordination titration, IR spectra and (1) H-NMR, and the fluorescence emission mechanism, fluorescence intensities and phosphorescence spectra were also investigated by comparison. It was shown that the ternary rare-earth complex showed stronger fluorescence intensities than the binary rare-earth complexes in such material. The strongest characteristic fluorescence emission intensity of the ternary system was 8.23 times, 3.58 times as strong as that of the binary systems TbL(7) (ClO(4))(3) · 3H(2)O and TbL'(3.5) (ClO(4))(3) · 4H(2)O, respectively. By fluorescence analysis it was found that both diphenyl sulphoxide and bipyridine could sensitize the fluorescence intensities of rare-earth ions. In particular, in the ternary rare-earth complex, introduction of bipyridine was of benefit to the fluorescence properties of Tb(III).
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Affiliation(s)
- Wen-Xian Li
- College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, People's Republic of China.
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43
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Petrášek Z, Suhling K. Photon arrival timing with sub-camera exposure time resolution in wide-field time-resolved photon counting imaging. OPTICS EXPRESS 2010; 18:24888-901. [PMID: 21164834 DOI: 10.1364/oe.18.024888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate that an ultra-fast CMOS camera combined with a photon counting image intensifier can be used to determine photon arrival times well below the exposure time of the camera. We can obtain a time resolution down to around 1% of the exposure time, i.e. of the order of 40 ns with microsecond exposure times. This is achieved by exploiting the invariant phosphor decay of the image intensifier's phosphor screen: Developing a suitable mathematical framework, we show that the relative intensities of the phosphor decay in successive frames following the photon detection uniquely determine the photon arrival time. This approach opens a way to measuring fast luminescence decays in parallel in many pixels. Possible applications include oxygen and ion concentration imaging using probes with luminescence lifetimes in the range of 100 ns to microseconds.
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Affiliation(s)
- Zdeněk Petrášek
- Biotechnologisches Zentrum, Technische Universität Dresden, Tatzberg 47/49, 01307 Dresden, Germany.
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44
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Suhling K, Sergent N, Levitt J, Green M. Rapid wide-field photon counting imaging with microsecond time resolution. OPTICS EXPRESS 2010; 18:25292-25298. [PMID: 21164877 DOI: 10.1364/oe.18.025292] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report a novel wide-field imaging method capable of time-correlated single photon counting. It is based on a photon counting image intensifier coupled to an ultra-fast CMOS camera running at 40 kHz frame rate. Using a pulsed excitation source and decaying luminescent sample, the arrival times of hundreds of photons can be determined simultaneously in many pixels with microsecond resolution and reduced photon pile-up. The detection system is mounted on an inverted microscope and applied to time-resolved imaging of Europium-containing polyoxometalate nanoparticles.
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Affiliation(s)
- Klaus Suhling
- Department of Physics, King’s College London, Strand, London WC2R 2LS, UK
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45
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Kimura H, Kon N, Furukawa S, Mukaida M, Yamakura F, Matsumoto K, Sone H, Murakami-Murofushi K. Effect of endurance exercise training on oxidative stress in spontaneously hypertensive rats (SHR) after emergence of hypertension. Clin Exp Hypertens 2010; 32:407-15. [PMID: 20828222 DOI: 10.3109/10641961003667930] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The purpose of this study is to elucidate the effect of wheel training on oxidative stress maker levels in spontaneous hypertensive rats (SHR). 4-hydroxynonenal and 3-nitrotyrosine levels in the aorta of SHRs were allowed to run for 10 weeks from the age of 15 weeks were measured and compared with those of nonexercised SHRs. The 4-hydroxynonenal and 3-nitrotyrosine levels in the exercised group were significantly lower than those in the nonexercised group. The exercised group showed a significant increase of manganese-containing superoxide dismutase. Endurance exercise showed a possible suppressing effect on the arteriosclerosis development by reducing oxidative stress, even after emergence of hypertension.
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Affiliation(s)
- Hiroko Kimura
- Department of Forensic Medicine, Juntendo University School of Medicine, Tokyo, Japan.
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46
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Xu D, Xu Y, Cheng N, Zhou X, Shi Y, He Q. Synthesis, characterization, and biological studies of lanthanide complexes with 2,6-pyridine dicarboxylic acid and α-picolinic acid. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.499937] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Dongfang Xu
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
| | - Yanming Xu
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
| | - Ningning Cheng
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
| | - Xianan Zhou
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
| | - Yang Shi
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
| | - Qizhuang He
- a College of Life and Environment Sciences, Shanghai Normal University , Shanghai 200234, China
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47
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dos Santos ER, Freire RO, da Costa NB, Paz FAA, de Simone CA, Júnior SA, Araújo AAS, Nunes LAO, de Mesquita ME, Rodrigues MO. Theoretical and Experimental Spectroscopic Approach of Fluorinated Ln3+−β-Diketonate Complexes. J Phys Chem A 2010; 114:7928-36. [DOI: 10.1021/jp104038r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edjane R. dos Santos
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Ricardo O. Freire
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Nivan B. da Costa
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Filipe A. Almeida Paz
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Carlos A. de Simone
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Severino A. Júnior
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Adriano A. S. Araújo
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Luiz Antônio O. Nunes
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Maria E. de Mesquita
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
| | - Marcelo O. Rodrigues
- Department of Chemistry, UFS, 49100-000 São Cristóvão, SE, Brazil, Department of Chemistry Fundamental, UFPE, 50590-470 Recife, PE, Brazil, Department of Chemistry, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal, Department of Chemistry, UFAL, 57072-970 Maceió, AL, Brazil, and Physics Institute of São Carlos, IFSC/USP, 13560-970 São Carlos, SP, Brazil
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48
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Huo FJ, Yin CX, Wu YB, Yang P. DNA-binding spectra and cleavage studies on Ce(III) complex of 2-[(Trifluoroaceto)aceto]thinophene-piperidine ligands. RUSS J INORG CHEM+ 2010. [DOI: 10.1134/s0036023610070156] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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49
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Armelao L, Quici S, Barigelletti F, Accorsi G, Bottaro G, Cavazzini M, Tondello E. Design of luminescent lanthanide complexes: From molecules to highly efficient photo-emitting materials. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.07.025] [Citation(s) in RCA: 765] [Impact Index Per Article: 54.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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50
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Guo L, Yan B. Chemical-Bonding Assembly, Physical Characterization, and Photophysical Properties of Lanthanide Hybrids from a Functional Thiazole Bridge. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200901006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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