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Cleiton Kunzler Stephan Handschuh‐Wang Manuel Roesener Holger Schnherr 《Macromolecular bioscience》2020,20(6)
Here, the formation of giant enzyme‐degradable polymersomes using the electroformation method is reported. Poly(ethylene glycol)‐block‐poly(ε‐caprolactone) polymersomes have been shown previously to be attractive candidates for the detection of bacterial proteases and protease mediated release of encapsulated reporter dyes and antimicrobials. To maximize the efficiency, the maximization of block copolymer (BCP) vesicle size without compromising their properties is of prime importance. Thus, the physical‐chemical properties of the BCP necessary to self‐assemble into polymeric vesicles by electroformation are first identified. Subsequently, the morphology of the self‐assembled structures is extensively characterized by different microscopy techniques. The vesicular structures are visualized for giant polymersomes by confocal laser scanning microscopy upon incorporation of reporter dyes during the self‐assembly process. Using time correlated single photon counting and by analyzing the fluorescence decay curves, the nanoenvironment of the encapsulated fluorophores is unveiled. Using this approach, the hollow core structure of the polymersomes is confirmed. Finally, the encapsulation of different dyes added during the electroformation process is studied. The results underline the potential of this approach for obtaining microcapsules for subsequent triggered release of signaling fluorophores or antimicrobially active cargo molecules that can be used for bacterial infection diagnostics and/or treatment. 相似文献
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Ubiquinone‐Rhodol (UQ‐Rh) for Fluorescence Imaging of NAD(P)H through Intracellular Activation
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Dr. Hirokazu Komatsu Dr. Yutaka Shindo Prof. Dr. Kotaro Oka Dr. Jonathan P. Hill Prof. Dr. Katsuhiko Ariga 《Angewandte Chemie (International ed. in English)》2014,53(15):3993-3995
The nicotinamide adenine dinucleotide (NAD) derivatives NADH and NADPH are critical components of cellular energy metabolism and operate as electron carriers. A novel fluorescent ubiquinone‐rhodol derivative (UQ‐Rh) was developed as a probe for NAD(P)H. By using the artificial promoter [(η5‐C5Me5)Ir(phen)(H2O)]2+, intracellular activation and imaging of NAD(P)H were successfully demonstrated. In contrast to bioorthogonal chemistry, this “bioparallel chemistry” approach involves interactions with native biological processes and could potentially be used to control or investigate cellular systems. 相似文献
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Inside Back Cover: X‐ray Radiation‐Controlled NO‐Release for On‐Demand Depth‐Independent Hypoxic Radiosensitization (Angew. Chem. Int. Ed. 47/2015)
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Dr. Wenpei Fan Prof. Wenbo Bu Prof. Zhen Zhang Dr. Bo Shen Hui Zhang Dr. Qianjun He Dr. Dalong Ni Dr. Zhaowen Cui Dr. Kuaile Zhao Dr. Jiwen Bu Prof. Jiulin Du Dr. Jianan Liu Prof. Jianlin Shi 《Angewandte Chemie (International ed. in English)》2015,54(47):14191-14191
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Rare‐Earth‐Based Nanoparticles with Simultaneously Enhanced Near‐Infrared (NIR)‐Visible (Vis) and NIR‐NIR Dual‐Conversion Luminescence for Multimodal Imaging
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Dandan Ma Xiang Xu Min Hu Jing Wang Zhenxi Zhang Jian Yang Lingjie Meng 《化学:亚洲杂志》2016,11(7):1050-1058
Multifunctional NaGdF4:Yb3+,Er3+,Nd3+@NaGdF4:Nd3+ core–shell nanoparticles (called Gd:Yb3+,Er3+,Nd3+@Gd:Nd3+ NPs) with simultaneously enhanced near‐infrared (NIR)‐visible (Vis) and NIR‐NIR dual‐conversion (up and down) luminescence (UCL/DCL) properties were successfully synthesized. The resulting core–shell NPs simultaneously emitted enhanced UCL at 522, 540, and 660 nm and DCL at 980 and 1060 nm under the excitation of a 793 nm laser. The enhanced UCL and DCL can be explained by complex energy‐transfer processes, Nd3+→Yb3+→Er3+ and Nd3+→Yb3+, respectively. The effects of Nd3+ concentration and shell thickness on the UCL/DCL properties were systematically investigated. The UCL and DCL properties of NPs were observed under the optimal conditions: a shell Nd3+ content of 20 % and a shell thickness of approximately 5 nm. Moreover, the Gd:Yb3+,Er3+,Nd3+@Gd:20 % Nd3+ NPs exhibited remarkable magnetic resonance imaging (MRI) properties similar to that of a clinical agent, Omniscan. Thus, the core–shell NPs with excellent UCL/DCL/magnetic resonance imaging (MRI) properties have great potential for both in vitro and in vivo multimodal bioimaging. 相似文献
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Inside Back Cover: Near‐Infrared‐Light‐Mediated Imaging of Latent Fingerprints based on Molecular Recognition (Angew. Chem. Int. Ed. 6/2014)
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Jie Wang Ting Wei Xinyang Li Binhao Zhang Jiaxi Wang Chi Huang Prof. Dr. Quan Yuan 《Angewandte Chemie (International ed. in English)》2014,53(6):1709-1709
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Inside Back Cover: Synthesis of a Far‐Red Photoactivatable Silicon‐Containing Rhodamine for Super‐Resolution Microscopy (Angew. Chem. Int. Ed. 5/2016)
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Jonathan B. Grimm Dr. Teresa Klein Dr. Benjamin G. Kopek Dr. Gleb Shtengel Dr. Harald F. Hess Prof. Dr. Markus Sauer Dr. Luke D. Lavis 《Angewandte Chemie (International ed. in English)》2016,55(5):1925-1925
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Tuning Phenols with Intra‐Molecular Bond Shifted HYdrogens (IM‐SHY) as diaCEST MRI Contrast Agents
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Xing Yang Nirbhay N. Yadav Xiaolei Song Prof. Sangeeta Ray Banerjee Hannah Edelman Il Minn Prof. Peter C. M. van Zijl Prof. Martin G. Pomper Prof. Michael T. McMahon 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(48):15824-15832
The optimal exchange properties for chemical exchange saturation transfer (CEST) contrast agents on 3 T clinical scanners were characterized using continuous wave saturation transfer, and it was demonstrated that the exchangeable protons in phenols can be tuned to reach these criteria through proper ring substitution. Systematic modification allows the chemical shift of the exchangeable protons to be positioned between 4.8 to 12 ppm from water and enables adjustment of the proton exchange rate to maximize CEST contrast at these shifts. In particular, 44 hydrogen‐bonded phenols are investigated for their potential as CEST MRI contrast agents and the stereoelectronic effects on their CEST properties are summarized. Furthermore, a pair of compounds, 2,5‐dihydroxyterephthalic acid and 4,6‐dihydroxyisophthalic acid, were identified which produce the highest sensitivity through incorporating two exchangeable protons per ring. 相似文献
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Inside Back Cover: Visualizing the Stoichiometry of Industrial‐Style Co‐Mo‐S Catalysts with Single‐Atom Sensitivity (Angew. Chem. Int. Ed. 40/2014)
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Yuanyuan Zhu Quentin M. Ramasse Michael Brorson Poul G. Moses Lars P. Hansen Christian F. Kisielowski Stig Helveg 《Angewandte Chemie (International ed. in English)》2014,53(40):10827-10827
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Radiofluorination of a Pre‐formed Gallium(III) Aza‐macrocyclic Complex: Towards Next‐Generation Positron Emission Tomography (PET) Imaging Agents
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Dr. Rajiv Bhalla Prof. William Levason Dr. Sajinder K. Luthra Dr. Graeme McRobbie George Sanderson Prof. Gillian Reid 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(12):4688-4694
As part of a study to investigate the factors influencing the development of new, more effective metal‐complex‐based positron emission tomography (PET) imaging agents, the distorted octahedral complex, [GaCl(L)]?2 H2O has been prepared by reaction of 1‐benzyl‐1,4,7‐triazacyclononane‐4,7‐dicarboxylic acid hydrochloride (H2L?HCl) with Ga(NO3)3?9 H2O, which is a convenient source of GaIII for reactions in water. Spectroscopic and crystallographic data for [GaCl(L)]?2 H2O are described, together with the crystal structure of [GaCl(L)]?MeCN. Fluorination of this complex by Cl?/F? exchange was achieved in high yield by treatment with KF in water at room temperature over 90 minutes, although the reaction was complete in approximately 30 minutes if heated to 80 °C, giving [GaF(L)]?2 H2O in good yield. The same complex was obtained by hydrothermal synthesis from GaF3?3 H2O and Li2L, and has been characterised by single‐crystal X‐ray analysis, IR, 1H and 19F{1H} NMR spectroscopy and ESI+ MS. Radiofluorination of the pre‐formed [GaCl(L)]?2 H2O has been demonstrated on a 210 nanomolar scale in aqueous NaOAc at pH 4 by using carrier‐free 18F?, leading to 60–70 % 18F‐incorporation after heating to 80 °C for 30 minutes. The resulting radioproduct was purified easily by using a solid‐phase extraction (SPE) cartridge, leading to 98–99 % radiochemical purity. The [Ga18F(L)] is stable for at least 90 minutes in 10 % EtOH/NaOAc solution at pH 6, but defluorinates over this time scale at pH of approximately 7.5 in phosphate buffered saline (PBS) or human serum albumin (HSA). The subtle role of the Group 13 metal ion and co‐ligand donor set in influencing the pH dependence of this system is discussed in the context of developing potential new imaging agents for PET. 相似文献
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Back Cover: Polynuclear SmIII Polyamidoamine‐Based Dendrimer: A Single Probe for Combined Visible and Near‐Infrared Live‐Cell Imaging (Angew. Chem. Int. Ed. 11/2014)
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Dr. Alexandra Foucault‐Collet Dr. Chad M. Shade Iuliia Nazarenko Prof. Dr. Stéphane Petoud Dr. Svetlana V. Eliseeva 《Angewandte Chemie (International ed. in English)》2014,53(11):3034-3034
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Dinuclear Ruthenium(II) Complexes as Two‐Photon,Time‐Resolved Emission Microscopy Probes for Cellular DNA
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Elizabeth Baggaley Martin R. Gill Nicola H. Green David Turton Igor V. Sazanovich Stanley W. Botchway Carl Smythe John W. Haycock Julia A. Weinstein Jim A. Thomas 《Angewandte Chemie (International ed. in English)》2014,53(13):3367-3371
The first transition‐metal complex‐based two‐photon absorbing luminescence lifetime probes for cellular DNA are presented. This allows cell imaging of DNA free from endogenous fluorophores and potentially facilitates deep tissue imaging. In this initial study, ruthenium(II) luminophores are used as phosphorescent lifetime imaging microscopy (PLIM) probes for nuclear DNA in both live and fixed cells. The DNA‐bound probes display characteristic emission lifetimes of more than 160 ns, while shorter‐lived cytoplasmic emission is also observed. These timescales are orders of magnitude longer than conventional FLIM, leading to previously unattainable levels of sensitivity, and autofluorescence‐free imaging. 相似文献
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Yasuyuki Sasada Yuji Shibasaki Masato Suzuki Mitsuru Ueda 《Journal of polymer science. Part A, Polymer chemistry》2002,40(3):393-398
A positive working photosensitive polymer based on poly(2,6‐dihydroxy‐1,5‐naphthylene) (PDHN) with 1‐(1,1‐bis{4‐[2‐diazo‐1(2H)naphthalene‐5‐sulfonyloxy]phenyl}ethyl)‐4‐(1‐{4‐[2‐diazo‐1(2H)naphthalene‐5‐sulfonyloxy]phenyl}methylethyl) benzene (S‐DNQ) as a photosensitive compound has been developed. PDHN (number‐average molecular weight: 13,000; polydispersity index: 1.9) was prepared by oxidative coupling polymerization of the 2,6‐dihydroxynaphthalene‐benzylamine complex using iron(III) chloride hexahydrate in the solid state. A 10 wt % loss temperature of PDHN was 450 °C in air, and the film of 1 μm thickness showed excellent transparency above 400 nm. The resist system consisting of PDHN and S‐DNQ gave a clear positive pattern when it was exposed to 436 nm of light, followed by development with a 0.50 wt % aqueous tetramethylammonium hydroxide solution at 25 °C. The sensitivity (D) and contrast (γ) were 300 mJ/cm2 and 2.1, respectively. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 40: 393–398, 2002 相似文献