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Afterglow bio-applications by utilizing triplet excited states of organic materials

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Science China Chemistry 2023年第11期66卷 2930-2940页

作者： Yuanyuan Fan Qianqian Li Zhen Li Hubei Key Lab on Organic and Polymeric Opto-Electronic materials TaiKang Center for Life and Medical SciencesDepartment of ChemistryWuhan UniversityWuhan 430072China

Organic room temperature phosphorescence(RTP) materials with persistent afterglow exhibit good biocompatibility, high signal to noise ratio and time resolved imaging characteristics in bio-applications. Moreover, they can serve as hypoxia detection probes and photodynamic therapy agents for the sensitivity of triplet excitons toward oxygen in the surroundings. In this review, the recent progress of in vitro and in vivo afterglow bioimaging is presented by utilizing organic RTP materials. The strategies of molecular design and controlling methods of molecular packing were summarized, to prompt this new rising research field, with the emphasis on high intensity, ultralong lifetimes and red-shifted wavelengths of phosphorescence emission.

关键词： afterglow bioimaging room temperature phosphorescence triplet excited states

Application of Ag/AgBr/GdVO_4 composite photocatalyst in wastewater treatment

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Journal of Environmental sciences 2018年第1期30卷 68-75页

作者： Xin Zhang Chenghao Wang Chengxi Yu Botao Teng Yiming He Leihong Zhao Maohong Fan College of Chemistry and life sciences Zhejiang Normal University department of materials Science and Engineering Zhejiang Normal University department of Chemical & Petroleum Engineering University of Wyoming

Ag/AgBr/GdVO_4 composite photocatalysts were designed and synthesized in this paper.The physical and chemical structures, as well as optical properties of the synthesized composite were investigated via XRD, XPS, TEM, and UV–vis. It is found that the composite showed a ternary heterojunction structure of Ag, Ag Br and GdVO_4. Meanwhile, it has a high intensity of light current, indicating its high separation efficiency of electron and hole.Photocatalytic oxidation of rhodamine B（RhB） under visible light irradiation was performed to investigate the activity of the Ag/Ag Br/GdVO_4 composite. Result indicates that it shows excellent photocatalytic activity. Under visible light irradiation for 12 min, about 80% of Rh B（30 μmol/L） was degraded. The degradation rate is estimated to be 0.253 min1, which is three times higher than that of pure AgBr. The high photoactivity can be ascribed to the synergetic effect of Ag Br, GdVO_4, and Ag nanoparticle in separation of electron–hole pairs.

关键词： Photocatalysis GdVO4 AgBr Composite material

Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit boards

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Frontiers of Environmental Science & Engineering 2023年第10期17卷 65-74页

作者： Giulia Merli Alessandro Becci Alessia Amato Francesca Beolchini department of life and Environmental sciences Polytechnic University of MarcheAncona 60131Italy

The work presented here focused on the extraction of gold (Au), silver (Ag) and palladium (Pd) from electronic waste using a solution of ammonium thiosulfate. Thiosulfate was used as a valid alternative to cyanide for precious metal extractions, due to its non-toxicity and high selectivity. The interactions between sodium thiosulfate, total ammonia/ammonium, precious metal concentrations and the particle size of the waste printed circuit boards (WPCBs) were studied by the response surface methodology (RSM) and the principal component analysis (PCA) to maximize precious metal mobilization. Au extraction reached a high efficiency with a granulometry of less than 0.25 mm, but the consumption of reagents was high. On the other hand, Ag extraction depended neither on thiosulfate/ammonia concentration nor granulometry of WPCBs and it showed efficiency of 90% also with the biggest particle size (0.50 < Ø < 1.00 mm). Pd extraction, similarly to Au, showed the best efficiency with the smallest and the medium WPCB sizes, but required less reagents compared to Au. The results showed that precious metal leaching is a complex process (mainly for Au, which requires more severe conditions in order to achieve high extraction efficiencies) correlated with reagent concentrations, precious metal concentrations and WPCB particle sizes. These results have great potentiality, suggesting the possibility of a more selective recovery of precious metals based on the different granulometry of the WPCBs. Furthermore, the high extraction efficiencies obtained for all the metals bode well in the perspective of large-scale applications.

关键词： Thiosulfate Printed circuit boards Precious metals Leaching Hydrometallurgy

Thermal annealing promoted room temperature phosphorescence: motion models and internal mechanism

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National Science Review 2023年第11期10卷 171-182页

作者： Yan Gao Jie Lu Qiuyan Liao Shuhui Li Qianqian Li Zhen Li Wuhan University Hubei Key Lab on Organic and Polymeric Opto-Electronic materials department of Chemistry Tai Kang Center for life and Medical sciences

Thermal annealing has been proven to be an efficient method to optimize the device performance of organic and polymeric opto-electronic materials. However, no detailed information of aggregate structures was obtained for a deeper understanding of what happens during thermal annealing. Herein, through modulation of molecular configurations by tunable linkage positions, and the amplified amplitudes of molecular motions by incorporation of additional methylene units, accurate changes of aggregated structures upon thermal annealing have been achieved, accompanying with the ‘turn-on’ room temperature phosphorescence(RTP) response by about 4800-and 177-fold increase of lifetimes. The stretching and swing motion models have been proposed, which afforded an efficient way to investigate the science of dynamic aggregation in depth.

关键词： room temperature phosphorescence thermal annealing structural reconfiguration molecular motion intermolecular interaction

Control of Emotion and Wakefulness by Neurotensinergic Neurons in the Parabrachial Nucleus

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Neuroscience Bulletin 2023年第4期39卷 589-601页

作者： Jingwen Chen Noam Gannot Xingyu Li Rongrong Zhu Chao Zhang Peng Li Fundamental Research Center Shanghai Yangzhi Rehabilitation HospitalSchool of Life Sciences and TechnologyTongji UniversityShanghai201619China life sciences Institute University of MichiganAnn ArborMI48109USA department of Biologic and materials sciences School of DentistryUniversity of MichiganAnn ArborMI 48109USA department of Molecular and Integrative Physiology School of MedicineUniversity of MichiganAnn ArborMI 48109USA

The parabrachial nucleus(PBN)integrates interoceptive and exteroceptive information to control various behavioral and physiological processes including breathing,emotion,and sleep/wake regulation through the neural circuits that connect to the forebrain and the brainstem.However,the precise identity and function of distinct PBN subpopulations are still largely unknown.Here,we leveraged molecular characterization,retrograde tracing,optogenetics,chemogenetics,and electrocortical recording approaches to identify a small subpopulation of neurotensin-expressing neurons in the PBN that largely project to the emotional control regions in the forebrain,rather than the medulla.Their activation induces freezing and anxiety-like behaviors,which in turn result in tachypnea.In addition,optogenetic and chemogenetic manipulations of these neurons revealed their function in promoting wakefulness and maintaining sleep architecture.We propose that these neurons comprise a PBN subpopulation with specific gene expression,connectivity,and function,which play essential roles in behavioral and physiological regulation.

关键词： Parabrachial nucleus Neurotensin Anxiety Sleep Wakefulness Breathing Neural circuit Freezing Medulla

Integration of multiple flexible electrodes for realtime detection of barrier formation with spatial resolution in a gut-on-chip system

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Microsystems & Nanoengineering 2024年第1期10卷 105-114页

作者： Mara Lucchetti Gabriel Werr Sofia Johansson Laurent Barbe Léa Grandmougin Paul Wilmes Maria Tenje Luxembourg Centre for Systems Biomedicine(LCSB) University of LuxembourgEsch-sur-Alzette L-4362Luxembourg Division of Biomedical Engineering Department of Materials Science and EngineeringScience for Life LaboratoryUppsala University75121 UppsalaSweden department of life sciences and Medicine Faculty of ScienceTechnology and MedicineUniversity of LuxembourgEsch-sur-Alzette L-4362Luxembourg

In healthy individuals,the intestinal epithelium forms a tight barrier to prevent gut bacteria from reaching blood circulation.To study the effect of probiotics,dietary compounds and drugs on gut barrier formation and disruption,human gut epithelial and bacterial cells can be cocultured in an in vitro model called the human microbial crosstalk(HuMiX)gut-on-a-chip system.Here,we present the design,fabrication and integration of thin-film electrodes into the HuMiX platform to measure transepithelial electrical resistance(TEER)as a direct readout on barrier tightness in realtime.As various aspects of the HuMiX platform have already been set in their design,such as multiple compressible layers,uneven surfaces and nontransparent materials,a novel fabrication method was developed whereby thin-film metal electrodes were first deposited on flexible substrates and sequentially integrated with the HuMiX system via a transfer-tape approach.Moreover,to measure localized TEER along the cell culture chamber,we integrated multiple electrodes that were connected to an impedance analyzer via a multiplexer.We further developed a dynamic normalization method because the active measurement area depends on the measured TEER levels.The fabrication process and system setup can be applicable to other barrier-on-chip systems.As a proof-of-concept,we measured the barrier formation of a cancerous Caco-2 cell line in real-time,which was mapped at four spatially separated positions along the HuMiX culture area.

关键词： barrier system multiple

Citric Acid-Based Intrinsic Band-Shifting Photoluminescent materials

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Research 2023年第4期2023卷 33-53页

作者： Dingbowen Wang Yizhu Chen Tunan Xia Mariana Claudino Allison Melendez Xingjie Ni Cheng Dong Zhiwen Liu Jian Yang department of BiomedicalEngineering Materials ResearchInstituteThe HuckInstitutes of the Life Sciences The Pennsylvania State UniversityUniversity ParkPA 16802USA department of Electrical Engineering materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA

Citric acid,an important metabolite with abundant reactive groups,has been demonstrated as a promising starting material to synthesize diverse photoluminescent materials including small molecules,polymers,and carbon dots.The unique citrate chemistry enables the development of a series of citric acid-based molecules and nanomaterials with intriguing intrinsic band-shifting behavior,where the emission wavelength shifts as the excitation wavelength increases,ideal for chromatic imaging and many other applications.In this review,we discuss the concept of“intrinsic band-shifting photoluminescent materials”,introduce the recent advances in citric acid-based intrinsic band-shifting materials,and discuss their potential applications such as chromatic imaging and multimodal sensing.It is our hope that the insightful and forward-thinking discussion in this review will spur the innovation and applications of the unique band-shifting photoluminescent materials.

关键词： materials. shifting luminescent

Rational design of FeS_(2)microspheres as high-performance catalyst for electrooxidation of hydrazine

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Journal of materials Science & Technology 2022年第15期110卷 161-166页

作者： Jie Sun Chuangwei Liu Wenhan Kong Jie Liu Liangyu Ma Song Li Yuanhong Xu Institute of Biomedical Engineering College of Life SciencesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China department of Energy Conversion and Storage Technical University of Denmark2800 Kgs.LyngbyDenmark Key Lab for Anisotropy and Texture of materials School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

Inspired by the relatively recognized performance of transition metal sulfides in the oxidation of hydrazine,the catalytic properties of FeS_(2) and Fe_(3)S_(4) are compared via the density functional theory calculations.Due to the different coordination numbers of iron-sulfur,the free energies of the dehydrogenation steps on FeS_(2) are far less than those on Fe_(3)S_(4),which led to the much better catalytic performance of FeS_(2).Accordingly,FeS_(2) microspheres are rationally proposed as a more efficient electrocatalyst for hydrazine oxidation,which is then prepared by a facile one-step hydrothermal strategy.Such FeS_(2)microspheres show great activity for hydrazine oxidation with an onset oxidation potential of 0.22 V vs.reversible hydrogen electrode,and a peak current density of 16 m A cm^(-2).Meanwhile,stability and high faradaic efficiency(3.5e-/N_(2)H_(4))is obtained for hydrazine oxidation to N_(2).

关键词： Rational design Hydrazine electrooxidation FeS_(2)microspheres Electrochemistry

Allosteric conformational changes of G proteins upon its interaction with membrane and GPCR

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Chinese Chemical Letters 2022年第2期33卷 747-750页

作者： Longmei Li Jin Zhang Wenjing Sun Weimin Gong Changlin Tian Pan Shi Chaowei Shi Hefei National Laboratory of Physical Science at Microscale and School of life sciences University of Science and Technology of ChinaHefei 230027China department of Chemical Physics at School of Chemistry and materials sciences University of Science and Technology of ChinaHefei 230027China

Current resolved structures of GPCRs and G protein complexes provided important insights into G protein activation. However, the binding or dissociation of GPCRs with G protein is instantaneous and highly dynamic in the intracellular environment. The conformational dynamic of G protein still needs to be addressed. In this study, we applied ^(19)F solution NMR spectroscopy to monitor the conformational changes of G protein upon interact with detergent mimicking membrane and receptor. Our results show that there are two states equilibria in the G_(α)in apo states. The interaction of G_(α)with detergents will accelerate this conformational transformation and induce a state that tends to bind to GPCRs. Finally, the G_(α)proteins presented a fully activation state when they coupled to GPCRs.

关键词： 19F solution NMR G protein-coupled receptors Conformational dynamics G protein