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Fan E, Guo H, Hao T, Zhao R, Zhang P, Feng Y, Liu Y, Deng K. Morpholine-modified polyacrylamides with Polymerization-Induced emission and its specific detection to Cu 2+ ions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 309:123782. [PMID: 38215564 DOI: 10.1016/j.saa.2023.123782] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 01/14/2024]
Abstract
In this work, three morpholine-modified polyacrylamide derivatives (MMPAm) were successfully prepared by free radical polymerization of monomers with morpholine moiety. The intramolecular aggregation of morpholine rings on macromolecular backbone gives MMPAm a significant polymerization-induced emission (PIE). Particularly, poly(N-morpholine acrylamide) (PNMPA) has the characteristics of strong fluorescence at 450 nm, and its fluorescence quantum yield reaches 2.87 %. The introduction of morpholine moiety, the length of CH2 spacer between morpholine ring and the backbone and the molecular weight play the important roles in PIE properties of PNMPA. Interestingly, PNMPA can recognize and detect Cu2+ specifically even in the presence of 12 other metal ions by thorough fluorescence quenching, and the detection limit of PNMPA is 17.3 μM. Furthermore, the dynamic quenching of PNMPA by Cu2+ ions and the complexation ratio of 1:2 according to JOB's working diagram were confirmed by fluorescence titration. Under the assistance of EDTA, a reversible detection system for Cu2+ is achieved, and a portable test paper from PNMPA for the detection of Cu2+ was also made. In conclusion, PNMPA is endowed with a significant PIE effect by the intramolecular aggregation of morpholine rings along the backbone in the polymerization of non-fluorescent monomer, and is expected to be a promising material for specific detection to Cu2+ ions.
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Affiliation(s)
- Enze Fan
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Huiying Guo
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Tingting Hao
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Ronghui Zhao
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China; Department of Clinical Pharmacy, Affiliated Hospital of Hebei University, Baoding 071002, China
| | - Pengfei Zhang
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Yayu Feng
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Yunfei Liu
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China
| | - Kuilin Deng
- Key Laboratory of Analytical Science and Technology of Hebie Province (Project Number: 22567620H), College of Chemistry and Materials Science, Hebei University, Baoding 071002, China.
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Prasanna AM, Sen P. Recent Developments of Hybrid Fluorescence Techniques: Advances in Amyloid Detection Methods. Curr Protein Pept Sci 2024; 25:667-681. [PMID: 38715332 DOI: 10.2174/0113892037291597240429094515] [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: 12/26/2023] [Revised: 04/05/2024] [Accepted: 04/18/2024] [Indexed: 09/21/2024]
Abstract
Amyloid fibrils are formed from various pathological proteins. Monitoring their aggregation process is necessary for early detection and treatment. Among the available detection techniques, fluorescence is simple, intuitive, and convenient due to its sensitive and selective mode of detection. It has certain disadvantages like poor photothermal stability and detection state limitation. Research has focused on minimising the limitation by developing hybrid fluorescence techniques. This review focuses on the two ways fluorescence (intrinsic and extrinsic) has been used to monitor amyloid fibrils. In intrinsic/label free fluorescence: i) The fluorescence emission through aromatic amino acid residues like phenylalanine (F), tyrosine (Y) and tryptophan (W) is present in amyloidogenic peptides/protein sequence. And ii) The structural changes from alpha helix to cross-β-sheet structures during amyloid formation contribute to the fluorescence emission. The second method focuses on the use of extrinsic fluorophores to monitor amyloid fibrils i) organic dyes/small molecules, ii) fluorescent tagged proteins, iii) nanoparticles, iv) metal complexes and v) conjugated polymers. All these fluorophores have their own limitations. Developing them into hybrid fluorescence techniques and converting it into biosensors can contribute to early detection of disease.
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Affiliation(s)
- A Miraclin Prasanna
- Centre for Bio Separation Technology (CBST), School of Biosciences and Technology, VIT, Vellore, 632014, Tamil Nadu, India
| | - Priyankar Sen
- Centre for Bio Separation Technology (CBST), School of Biosciences and Technology, VIT, Vellore, 632014, Tamil Nadu, India
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Hou X, Song Y, Lv Y, Wang P, Chen K, Li G, Guo L. Preparation of temperature-responsive nanomicelles with AIE property as fluorescence probe for detection of Fe 3+ and Fe 2. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 290:122254. [PMID: 36577245 DOI: 10.1016/j.saa.2022.122254] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 12/11/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
Temperature-responsive nanomicelles with aggregation induced emission (AIE) property were prepared by the host-guest complexation of ferrocene functionalized tetraphenyl (TPE-Fc) and β-cyclodextrin-poly (N-isopropylacrylamide) (β-CD-(PNIPAM)7). The AIE chromophore TPE-Fc bound to the hydrophobic cavity of cyclodextrin serves as the core of micelles, and temperature sensitive PNIPAM serves as the shell to give the micelles good solubility. The size of the nanomicelles is about 100 nm. At the excitation wavelength of 340 nm, the strongest fluorescent emission peak was 421 nm. The introduction of cyclodextrin star polymer increased the fluorescence intensity of nanomicelles, thus improving the recognition of probe to Fe3+ and Fe2+. The fluorescent probe can quickly detect Fe3+ and Fe2+ in water within 5 min even in the presence of various interfering ions. The detection limits of Fe3+ and Fe2+ were 1.04 μM and 0.78 μM, respectively in the range of 10-90 μM. The formation of complex between the probe and Fe3+/Fe2+ was supported by Job's plot. The probe was successfully applied to the detection of Fe3+and Fe2+ in actual water sample with a good recovery. In addition, a possible sensing mechanism for the interaction of iron ions with amide bond groups of nanomicelles was proposed.
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Affiliation(s)
- Xinhui Hou
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Yifan Song
- Chu Kochen Honors College, Zhejiang University, Hangzhou 310058, China
| | - Yupeng Lv
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Peiyao Wang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Kun Chen
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Guiying Li
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Lei Guo
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
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