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Jiang HQ, Lu LY, Weng ZM, Huang KY, Yang Y, Deng HH, Xu YY, Chen W, Zhuang QQ. 6-Aza-2-Thiothymine-Capped Gold Nanoclusters as Robust Antimicrobial Nanoagents for Eradicating Multidrug-Resistant Escherichia coli Infection. ACS OMEGA 2023; 8:47123-47133. [PMID: 38107925 PMCID: PMC10720302 DOI: 10.1021/acsomega.3c07114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 11/14/2023] [Accepted: 11/20/2023] [Indexed: 12/19/2023]
Abstract
Multidrug-resistant bacterial infections, especially those caused by multidrug-resistant Escherichia coli (E. coli) bacteria, are an ever-growing threat because of the shrinking arsenal of efficacious antibiotics. Therefore, it is urgently needed to develop a kind of novel, long-term antibacterial agent effectively overcome resistant bacteria. Herein, we present a novel designed antibacterial agent-6-Aza-2-thiothymine-capped gold nanoclusters (ATT-AuNCs), which show excellent antibacterial activity against multidrug-resistant E. coli bacteria. The prepared AuNCs could permeabilize into the bacterial cell membrane via binding with a bivalent cation (e.g., Ca2+), followed by the generation of reactive oxygen species (e.g., •OH and •O2-), ultimately resulting in protein leakage from compromised cell membranes, inducing DNA damage and upregulating pro-oxidative genes intracellular. The AuNCs also speed up the wound healing process without noticeable hemolytic activity or cytotoxicity to erythrocytes and mammalian tissue. Altogether, the results indicate the great promise of ATT-AuNCs for treating multidrug-resistant E. coli bacterial infection.
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Affiliation(s)
- Hui-Qiong Jiang
- Department
of Cardiac Function Examination Room, Affiliated
Quanzhou First Hospital of Fujian Medical University, Quanzhou 362000, China
| | - Lin-Yan Lu
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Zhi-Min Weng
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Kai-Yuan Huang
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Yu Yang
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Hao-Hua Deng
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Ying-Ying Xu
- Department
of Pharmaceutics, School of Pharmacy, Fujian
Medical University, Fuzhou 350004, China
| | - Wei Chen
- Fujian
Key Laboratory of Drug Target Discovery and Structural and Functional
Research, School of Pharmacy, Fujian Medical
University, Fuzhou 350004, China
| | - Quan-Quan Zhuang
- Department
of Pharmacy, Affiliated Quanzhou First Hospital
of Fujian Medical University, Quanzhou 362000, China
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Huang Y, Zhang J, Zhou M, Pei R, Zhao Y. Engineering GaN/AuNC core-shell nanowire heterojunctions by gold nanoclusters with excitation-dependent behavior for enhancing the responsivity and stability of self-driven photodetectors. NANOSCALE ADVANCES 2023; 5:6228-6237. [PMID: 37941956 PMCID: PMC10628995 DOI: 10.1039/d3na00463e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 10/07/2023] [Indexed: 11/10/2023]
Abstract
Self-driven broadband photodetectors (PDs) with low-power consumption have great potential applications in the wide range of next-generation optoelectronic devices. In this study, a self-driven broadband PD responding to an ultraviolet-visible range based on gallium nitride/gold nanocluster (GaN/AuNC) core-shell nanowire heterojunctions is fabricated for the first time. By introducing the AuNCs onto the GaN nanowire surfaces, the GaN/AuNC core-shell nanowire heterojunctions can be formed efficiently. It is crucial that AuNCs have the functions of light collectors and hole conductors in heterojunctions due to the suitable energy level alignment. Under the optimized conditions of AuNCs, it is found that GaN/AuNC core-shell nanowires can significantly increase the photocurrent and responsivity of PDs, mainly resulting from the light interreflection within the heterojunctions and the effective improvement of carrier transport. Owing to the excitation-dependent emission behavior of AuNCs, the responsivity of PD with GaN/AuNC core-shell nanowire heterojunctions can be enhanced by around 330% compared with that of PD without AuNCs under visible illumination. Furthermore, GaN/AuNC hybrid nanowires with excitation-dependent fluorescence behavior can modulate the enhanced amplitude performance of broadband PDs. Owing to the high stability of AuNCs, the photocurrent of the PD with AuNCs is still quite stable after continuous operation for more than 20 000 s. Therefore, this study provides an effective method for developing new broadband PDs with high performance and low energy consumption.
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Affiliation(s)
- Yuanyuan Huang
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS) Suzhou 215123 China
| | - Jianya Zhang
- Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology Suzhou 215009 China
- Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS) Suzhou 215123 China
| | - Min Zhou
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China Hefei 230026 China
| | - Renjun Pei
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS) Suzhou 215123 China
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China Hefei 230026 China
| | - Yukun Zhao
- Key Lab of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS) Suzhou 215123 China
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China Hefei 230026 China
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3
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Sahoo K, Gazi TR, Roy S, Chakraborty I. Nanohybrids of atomically precise metal nanoclusters. Commun Chem 2023; 6:157. [PMID: 37495665 PMCID: PMC10372104 DOI: 10.1038/s42004-023-00958-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 07/13/2023] [Indexed: 07/28/2023] Open
Abstract
Atomically precise metal nanoclusters (NCs) with molecule-like structures are emerging nanomaterials with fascinating chemical and physical properties. Photoluminescence (PL), catalysis, sensing, etc., are some of the most intriguing and promising properties of NCs, making the metal NCs potentially beneficial in different applications. However, long-term instability under ambient conditions is often considered the primary barrier to translational research in the relevant application fields. Creating nanohybrids between such atomically precise NCs and other stable nanomaterials (0, 1, 2, or 3D) can help expand their applicability. Many such recently reported nanohybrids have gained promising attention as a new class of materials in the application field, exhibiting better stability and exciting properties of interest. This perspective highlights such nanohybrids and briefly explains their exciting properties. These hybrids are categorized based on the interactions between the NCs and other materials, such as metal-ligand covalent interactions, hydrogen-bonding, host-guest, hydrophobic, and electrostatic interactions during the formation of nanohybrids. This perspective will also capture some of the new possibilities with such nanohybrids.
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Affiliation(s)
- Koustav Sahoo
- School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Tapu Raihan Gazi
- School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Soumyadip Roy
- School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Indranath Chakraborty
- School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
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4
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Zhao J, Ziarati A, Rosspeintner A, Wang Y, Bürgi T. Engineering ligand chemistry on Au 25 nanoclusters: from unique ligand addition to precisely controllable ligand exchange. Chem Sci 2023; 14:7665-7674. [PMID: 37476726 PMCID: PMC10355100 DOI: 10.1039/d3sc01177a] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 06/14/2023] [Indexed: 07/22/2023] Open
Abstract
Au25 nanoclusters (NCs) protected by 18 thiol-ligands (Au25SR18, SR is a thiolate ligand) are the prototype of atomically precise thiolate-protected gold NCs. Studies concerning the alteration of the number of surface ligands for a given Au25SR18 NC are scarce. Herein we report the conversion of hydrophobic Au25PET18 (PET = 2-phenylethylthiolate) NCs to Au25SR19 [Au25PET18(metal complex)1] induced by ligand exchange reactions (LERs) with thiolated terpyridine-metal complexes (metal complex, metal = Ru, Fe, Co, Ni) under mild conditions (room temperature and low amounts of incoming ligands). Interestingly, we found that the ligand addition reaction on Au25PET18 NCs is metal dependent. Ru and Co complexes preferentially lead to the formation of Au25SR19 whereas Fe and Ni complexes favor ligand exchange reactions. High-resolution electrospray ionization mass spectrometry (HRESI-MS) was used to determine the molecular formula of Au25SR19 NCs. The photophysical properties of Au25PET18(Ru complex)1 are distinctly different from Au25PET18. The absorption spectrum is drastically changed upon addition of the extra ligand and the photoluminescence quantum yield of Au25PET18(Ru complex)1 is 14 times and 3 times higher than that of pristine Au25PET18 and Au25PET17(Ru complex)1, respectively. Interestingly, only one surface ligand (PET) could be substituted by the metal complex when neutral Au25PET18 was used for ligand exchange whereas two ligands could be exchanged when starting with negatively charged Au25PET18. This charge dependence provides a strategy to precisely control the number of exchanged ligands at the surface of NCs.
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Affiliation(s)
- Jiangtao Zhao
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Abolfazl Ziarati
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Arnulf Rosspeintner
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
| | - Yanan Wang
- Department of Chemical Engineering, University of Michigan Ann Arbor 2800 MI USA
| | - Thomas Bürgi
- Department of Physical Chemistry, University of Geneva 30 Quai Ernest-Ansermet 1211 Geneva 4 Switzerland
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Kumar Y, Sinha ASK, Nigam KDP, Dwivedi D, Sangwai JS. Functionalized nanoparticles: Tailoring properties through surface energetics and coordination chemistry for advanced biomedical applications. NANOSCALE 2023; 15:6075-6104. [PMID: 36928281 DOI: 10.1039/d2nr07163k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Significant advances in nanoparticle-related research have been made in the past decade, and amelioration of properties is considered of utmost importance for improving nanoparticle bioavailability, specificity, and catalytic performance. Nanoparticle properties can be tuned through in-synthesis and post-synthesis functionalization operations, with thermodynamic and kinetic parameters playing a crucial role. In spite of robust functionalization techniques based on surface chemistry, scalable technologies have not been explored well. The coordination enhancement via surface functionalization through organic/inorganic/biomolecules material has attracted much attention with morphology modification and shape tuning, which are indispensable aspects in the colloidal phase during biomedical applications. It is envisioned that surface amelioration influences the anchoring properties of nano interfaces for the immobilization of functional groups and biomolecules. In this work, various nanostructure and anchoring methodologies have been discussed, aiming to exploit their full potential in precision engineering applications. Simultaneous discussions on emerging characterization strategies for functionalized assemblies have been made to gain insights into functionalization chemistry. An overview of current advances and prospects of functionalized nanoparticles has been presented, with an emphasis on controllable attributes such as size, shape, morphology, functionality, surface features, Debye and Casimir interactions.
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Affiliation(s)
- Yogendra Kumar
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India.
| | - A S K Sinha
- Department of Chemical Engineering, Rajiv Gandhi Institute of Petroleum Technology, Jais - 229304, India.
| | - K D P Nigam
- Department of Chemical Engineering, Rajiv Gandhi Institute of Petroleum Technology, Jais - 229304, India.
- School of Chemical Engineering, University of Adelaide, North Terrace Campus, Adelaide (SA) 5005, Australia
| | - Deepak Dwivedi
- Department of Chemical Engineering, Rajiv Gandhi Institute of Petroleum Technology, Jais - 229304, India.
| | - Jitendra S Sangwai
- Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India.
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6
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Mu J, Xu W, Huang Z, Jia Q. Encapsulating copper nanoclusters in 3D metal-organic frameworks to boost fluorescence for bio-enzyme sensing, inhibitor screening, and light-emitting diode fabrication. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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7
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Zhuang J, Yu Y, Lu R. Mesoporous silica nanoparticles as carrier to overcome bacterial drug resistant barriers. Int J Pharm 2023; 631:122529. [PMID: 36563796 DOI: 10.1016/j.ijpharm.2022.122529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/27/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
Antibiotic resistance has become a global threat to health due to abuse of antibiotics. Lots of existing antibiotics have lost their effect on drug resistant bacteria. Moreover, the discovery of novel antibiotics becomes more and more difficult. It is necessary to develop new strategies to fight against antibiotic resistance. Nano-drug delivery systems endow old antibiotics with new vitality to defeat the antibiotic resistant barrier by protecting antibiotics against hydrolysis, increasing uptake and circumventing efflux pump. Among them, mesoporous silica nanoparticles (MSNs) are one of the most extensively investigated as carrier of antibiotics due to large drug loading capability, tunable physicochemical characteristics, and biocompatibility. MSNs can improve the delivery of antibiotics to bacteria greatly by reducing size, modifying surface, and regulating shapes. Furthermore, MSNs hybridized metal ions or metal nanoparticles exert stronger antibacterial effect by controlling the release of metal ions or increasing active oxygen species. In addition, metal capped MSNs are also able to load antibiotics to exert synergistic antibacterial effect. This paper firstly reviewed the current application of various nanomaterials as antibacterial agents, and then focused on the MSNs including the introduction of MSNs and various approaches for improving antibacterial effect of MSNs.
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Affiliation(s)
- Jie Zhuang
- School of Pharmacy, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China.
| | - Yiming Yu
- School of Pharmacy, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China
| | - Rui Lu
- School of Pharmacy, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China
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8
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Lu Y, Zhou Y, Xia J, Zhong S, Liu Y, Chen Q, Chen H. Raspberry-Like Gold Nanoparticles Based On Nanoclusters Anchored on Cyclodextrin-Functionalized Nanoparticles: Synthesis and Ultrasensitive Electrochemical Detection of Chromium(VI) Ions. Chempluschem 2022; 87:e202200385. [PMID: 36515239 DOI: 10.1002/cplu.202200385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 11/23/2022] [Indexed: 11/26/2022]
Abstract
A facile synthetic strategy is devised to construct raspberry like gold nanoparticles (RbNPs) formed by gold nanoclusters wrapped around β-cyclodextrin functionalized gold nanoparticles (CD-AuNPs@AuNCs). An efficient and sensitive electrochemical sensor for the detection of Cr(VI) has been developed based on RbNPs. The sensing platform exhibits an excellent wide linear range (100 pg mL-1 to 10 μg mL-1 ), extremely low detection limit (40.91 fg mL-1 i. e. 0.79 pM), which may pave a new way to fabricate other ultrasensitive electrochemical sensors based on the designed RbNPs.
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Affiliation(s)
- Yongkai Lu
- School of Life Sciences, Shanghai University, Shanghai, 200444, P.R.China
| | - Yangyang Zhou
- School of Medicine, Shanghai University, Shanghai, 200444, P. R. China
| | - Junjie Xia
- School of Life Sciences, Shanghai University, Shanghai, 200444, P.R.China
| | - Suyun Zhong
- School of Life Sciences, Shanghai University, Shanghai, 200444, P.R.China
| | - Yawen Liu
- School of Medicine, Shanghai University, Shanghai, 200444, P. R. China
| | - Qiang Chen
- School of Medicine, Shanghai University, Shanghai, 200444, P. R. China
| | - Hongxia Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, P.R.China
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9
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Li S, Xu W, Huang Z, Jia Q. Anchoring Cu Nanoclusters on Melamine-Formaldehyde Microspheres: A New Strategy for Triggering Aggregation-Induced Emission toward Specific Enzyme-Free Methyl Parathion Sensing. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:14522-14530. [PMID: 36342188 DOI: 10.1021/acs.jafc.2c05194] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Methyl parathion (MP) residues have aroused extensive attention on account of their significant threat to the environment and food safety. Currently reported fluorescent methods used for MP sensing largely depend upon an enzyme. Designing a facile and specific enzyme-free MP fluorescent sensor is in great demand, which remains a challenge. Here, negatively charged Cu nanoclusters (CuNCs) anchored on positively charged melamine-formaldehyde (MF) microspheres (MF@CuNCs) through an electrostatic interaction were prepared. MF microspheres triggered aggregation-induced emission (AIE) of CuNCs and successfully circumvented the shortcomings of poor stability and low luminescence of CuNCs. The fluorescence intensity of MF@CuNCs can be quenched by p-nitrophenol produced by MP under alkaline conditions. Accordingly, a specific enzyme-free MP sensing method was constructed with MF@CuNCs. In combination with a smartphone, visually quantitative analysis of MP in a fast and portable way was also achieved. For the first time, AIE of CuNCs used for enzyme-free MP sensing was successfully explored in this work, and it is believed that this method will open a new pathway for AIE of CuNCs to be applied in various applications.
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Affiliation(s)
- Songrui Li
- College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Wenhui Xu
- College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Zhenzhen Huang
- College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Qiong Jia
- College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
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Weng Z, Li Z, Zhang Y, Zhang M, Huang Z, Chen W, Peng H. Gold Nanocluster Probe-Based Electron-Transfer-Mediated Electrochemiluminescence Sensing Strategy for an Ultrasensitive Copper Ion Detection. Anal Chem 2022; 94:15896-15901. [DOI: 10.1021/acs.analchem.2c04012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhimin Weng
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Zhenglian Li
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Yixuan Zhang
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Mingying Zhang
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Zhongnan Huang
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Wei Chen
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
| | - Huaping Peng
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou350122, China
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11
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Li Q, Guo YM, Gao Y, Li G. Polyethyleneimine-protected silver cluster for label-free and highly selective detection of 2,4,6-trinitrotoluene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 276:121224. [PMID: 35397448 DOI: 10.1016/j.saa.2022.121224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 03/20/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Sensitive and selective detection of 2,4,6-trinitrotoluene (TNT) is critical for environmental protection and public health. In this work, a convenient synthesis strategy for preparation of fluorescent PEI-AgNCs was described and further a facile and label-free sensing strategy for detection of TNT was developed. The hyperbranched polyethyleneimine (PEI) were used as template to one-step synthesize functional PEI-AgNCs with bright fluorescence signal and rich amino groups on their surface. PEI can specifically bind to electron-deficient TNT through donor-receptor interaction to form Meissenheimer complex. Interestingly, the absorption spectra of the Meissenheimer complex overlap with the fluorescence emission peak of PEI-AgNCs, thus quenching fluorescence of PEI-Ag NCs through fluorescence resonance energy transfer (FRET). Furthermore, this bonding process also initiate aggregation of PEI-AgNCs and quench the fluorescence of PEI-AgNCs by the aggregation-induced quenching (AIQ) effect. The novel method demonstrates sensitivity with a detection limit for TNT have been obtained as 17 nM. In addition, the proposed sensing method also has good selectivity over other potential interference and displayed a good potential application value in real water samples with satisfactory recoveries, offering a promising platform for sensing TNT in public safety and security environment protection.
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Affiliation(s)
- Qing Li
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Science and Chemistry, Hunan University of Technology, 412007, China; State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yu-Meng Guo
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Science and Chemistry, Hunan University of Technology, 412007, China
| | - Yue Gao
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Science and Chemistry, Hunan University of Technology, 412007, China
| | - Guangli Li
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Science and Chemistry, Hunan University of Technology, 412007, China.
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