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Taniya OS, Khasanov AF, Sadieva LK, Santra S, Nikonov IL, Al-Ithawi WKA, Kovalev IS, Kopchuk DS, Zyryanov GV, Ranu BC. Polymers and Polymer-Based Materials for the Detection of (Nitro-)explosives. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6333. [PMID: 37763611 PMCID: PMC10532833 DOI: 10.3390/ma16186333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/17/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
Methods for the remote detection of warfare agents and explosives have been in high demand in recent times. Among the several detection methods, fluorescence methods appear to be more convenient due to their low cost, simple operation, fast response time, and naked-eye-visible sensory response. For fluorescence methods, a large variety of fluorescent materials, such as small-molecule-based fluorophores, aggregation-induced emission fluorophores/materials, and supramolecular systems, have been reported in the literature. Among them, fluorescent (bio)polymers/(bio)polymer-based materials have gained wide attention due to their excellent mechanical properties and sensory performance, their ability to recognize explosives via different sensing mechanisms and their combinations, and, finally, the so-called amplification of the sensory response. This review provides the most up-to-date data on the utilization of polymers and polymer-based materials for the detection of nitroaromatic compounds (NACs)/nitro-explosives (NEs) in the last decade. The literature data have been arranged depending on the polymer type and/or sensory mechanism.
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Affiliation(s)
- Olga S. Taniya
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
| | - Albert F. Khasanov
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
| | - Leila K. Sadieva
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
| | - Sougata Santra
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
| | - Igor L. Nikonov
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
- I. Ya. Postovsky Institute of Organic Synthesis of RAS (Ural Division), 22/20 S. Kovalevskoy/Akademicheskaya Str., 620219 Yekaterinburg, Russia
| | - Wahab K. A. Al-Ithawi
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
- Energy and Renewable Energies Technology Center, University of Technology-Iraq, Baghdad 10066, Iraq
| | - Igor S. Kovalev
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
| | - Dmitry S. Kopchuk
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
- I. Ya. Postovsky Institute of Organic Synthesis of RAS (Ural Division), 22/20 S. Kovalevskoy/Akademicheskaya Str., 620219 Yekaterinburg, Russia
| | - Grigory V. Zyryanov
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
- I. Ya. Postovsky Institute of Organic Synthesis of RAS (Ural Division), 22/20 S. Kovalevskoy/Akademicheskaya Str., 620219 Yekaterinburg, Russia
| | - Brindaban C. Ranu
- Chemical Engineering Institute, Ural Federal University, 19 Mira Str., 620002 Yekaterinburg, Russia; (O.S.T.); (A.F.K.); (L.K.S.); (S.S.); (I.L.N.); (W.K.A.A.-I.); (I.S.K.); (D.S.K.); (B.C.R.)
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Zhang X, Zhang L, Bie H, Xu J, Yuan Y, Jia L. Intelligent visual detection of OTC enabled by a multicolor fluorescence nanoprobe: Europium complex functionalized carbon dots. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 299:122867. [PMID: 37216821 DOI: 10.1016/j.saa.2023.122867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/10/2023] [Accepted: 05/10/2023] [Indexed: 05/24/2023]
Abstract
It is of great significance to realize ultra-sensitive and visual detection of oxytetracycline (OTC) residues, especially for public health and environmental safety. In this study, a multicolor fluorescence sensing platform (CDs-Cit-Eu) for OTC detection was constructed by using rare earth europium complex functionalized carbon dots (CDs). The blue-emitting CDs (λem = 450 nm) prepared by one-step hydrothermal method using nannochloropsis were not only the scaffold of Eu3+ ion coordination, but also the recognition unit of OTC. After adding OTC to the multicolor fluorescent sensor, the emission intensity of CDs decreased slowly, and the emission intensity of Eu3+ ions (λem = 617 nm) enhanced significantly, accompanying by a significant color change of the nanoprobe from blue to red. The detection limit of the probe for OTC was calculated to be 3.5 nM, manifesting ultra-high sensitivity towards OTC detection. In addition, OTC detection in real samples (honey, lake water, tap water) was successfully achieved. Moreover, a semi-hydrophobic luminescent film SA/PVA/CDs-Cit-Eu was also prepared for OTC detection. With the help of smartphone color recognition APP, real-time intelligent detection of OTC was realized.
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Affiliation(s)
- Xia Zhang
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China
| | - Lina Zhang
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China.
| | - Hongyan Bie
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China
| | - Jun Xu
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China
| | - Yingqi Yuan
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China
| | - Lei Jia
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, No. 2001 Shiji Road Jiaozuo, Henan 454000, China.
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Wang Q, Chu H, Zhang J, Ma W, Qin S, Gao L. ZnS:Eu @ZIF-8: Selective formation of ZnS:Eu QDs within a zinc methylimidazole framework for chemical sensing applications. Heliyon 2023; 9:e16081. [PMID: 37223711 PMCID: PMC10200851 DOI: 10.1016/j.heliyon.2023.e16081] [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: 12/09/2022] [Revised: 04/27/2023] [Accepted: 05/04/2023] [Indexed: 05/25/2023] Open
Abstract
Light harvesting based on a microporous zeolite imidazole backbone (MOF) has attracted considerable interest as a fluorescent sensor for the detection of analytes. In this work, we have prepared a novel complex containing quantum dots of doped rare earth elements by a one-pot method. to be applied to the fluorescence detection of pollution hazards. Because of the solid framework, the prepared ZnS:Eu@ZIF-8 composite shows desirable fluorescence properties. The selectivity and sensitivity of ZnS:Eu@ZIF -8 to TNP, which has a detection limit of 0.19 μmol/L, is further investigated and its sensing mechanism is discussed by means of fluorescence lifetime measurements in combination with emission and UV spectra. It should also be noted that this is the first doped quantum dot to be encapsulated in a MOF to be used for the potential detection of phenolic compounds in the aqueous environment, while the framework remains in place and no structural changes have occurred.
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Lv H, Tang H, Cai Y, Wu T, Peng D, Yao Y, Xu X. Highly Stable Metal‐Free Long‐Persistent Luminescent Copolymer for Low Flicker AC‐LEDs. Angew Chem Int Ed Engl 2022; 61:e202204209. [DOI: 10.1002/anie.202204209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Hongyu Lv
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Haitao Tang
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Yiyu Cai
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Tao Wu
- Ningbo Cuiying Chemical Technology Co., Ltd Ningbo 315000 P. R. China
| | - Dongliang Peng
- College of Materials Science and Engineering Xiamen University Xiamen 361005 P. R. China
| | - Yuan Yao
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province Westlake University Hangzhou 310024 P. R. China
| | - Xuhui Xu
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
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Lv H, Tang H, Cai Y, Wu T, Peng D, Yao Y, Xu X. Highly Stable Metal‐Free Long‐Persistent Luminescent Copolymer for Low Flicker AC‐LEDs. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hongyu Lv
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Haitao Tang
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Yiyu Cai
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
| | - Tao Wu
- Ningbo Cuiying Chemical Technology Co., Ltd Ningbo 315000 P. R. China
| | - Dongliang Peng
- College of Materials Science and Engineering Xiamen University Xiamen 361005 P. R. China
| | - Yuan Yao
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province Westlake University Hangzhou 310024 P. R. China
| | - Xuhui Xu
- College of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 P. R. China
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Sullam EM, Adam KM, NSANZAMAHORO STANISLAS, Cai M, Gao Z, Liu J, Chen H, Xiao J. One-pot synthesis of poly(vinylpyrrolidone)-encapsulated color-emitting silicon quantum dots for sensitive and selective detection of 2,4,6-trinitrophenol. NEW J CHEM 2022. [DOI: 10.1039/d2nj02703h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, we illustrate an efficient, convenient, and simple method for the sensitive and selective detection of nitro explosive 2,4,6-trinitrophenol (TNP) in 100% water medium by bright cyan-blue color emitting colloidal...
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Liu J, Fu T, Wu F, Wang H. Ratiometric fluorescence and smartphone dual-mode detection of glutathione using carbon dots coupled with Ag +-triggered oxidation of o-phenylenediamine. NANOTECHNOLOGY 2021; 32:445501. [PMID: 34330104 DOI: 10.1088/1361-6528/ac1978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Developing ratiometric fluorescence and smartphone dual-mode bioanalysis methods is important but challenging. A ratiometric fluorescence method for determining glutathione (GSH) using carbon dots (CDs) and Ag+-triggered o-phenylenediamine (OPD) oxidation is described here. Ag+oxidizes OPD to give 2,3-diaminophenazine (oxOPD), which effectively quenches CD fluorescence at 436 nm through the inner filter effect and causes a new emission peak at 561 nm. GSH chelates with Ag+and prevents the Ag+oxidizing OPD and therefore effectively preserves CD emission at 436 nm (blue) and allows only weak oxOPD fluorescence at 561 nm (orange) to occur. The oxOPD to CD fluorescence intensity ratio decreased linearly as the GSH concentration increased in the range 0-150 nM, and the detection limit was 15 nM. The ratiometric fluorescence probe lit with an ultraviolet lamp clearly changed color from orange to blue as the GSH concentration increased. An image was acquired using a smartphone camera and converted into digital values. The blue and red channel ratio was calculated and used to quantify GSH. The method therefore allows dual-mode detection of GSH.
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Affiliation(s)
- Jinshui Liu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Ting Fu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Fangfei Wu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Huaxin Wang
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
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8
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Liu J, Fu T, Liu C, Wu F, Wang H. Sensitive detection of picric acid in an aqueous solution using fluorescent nonconjugated polymer dots as fluorescent probes. NANOTECHNOLOGY 2021; 32:355503. [PMID: 34034241 DOI: 10.1088/1361-6528/ac04d1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
Nonconjugated polymer dots (NPDs) were successfully used as fluorescent probes to selectively and sensitively detect picric acid (PA). The NPDs were prepared from polyethylenimine and 1,4-phthalaldehyde under mild conditions and had excitation and emission maxima of 351 and 474 nm, respectively. Fluorescence of the NPDs was efficiently quenched by PA through the inner filter effect because of the overlapping PA absorption band and NPD excitation spectrum. The NPDs allowed PA to be determined with a high degree of sensitivity. The linear range was 0-140μM and the detection limit was 0.5μM. The work involved developing a novel method for synthesizing NPDs and a promising platform for determining PA in environmental media.
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Affiliation(s)
- Jinshui Liu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Ting Fu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Chenfu Liu
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou 341000, People's Republic of China
| | - Fangfei Wu
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Huaxin Wang
- College of Chemistry and Materials Science, Anhui Key Laboratory of Chemo/Biosensing, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-based Materials, Anhui Normal University, Wuhu 241000, People's Republic of China
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9
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Yang J, Chen W, Chen X, Zhang X, Zhou H, Du H, Wang M, Ma Y, Jin X. Detection of Cu 2+ and S 2- with fluorescent polymer nanoparticles and bioimaging in HeLa cells. Anal Bioanal Chem 2021; 413:3945-3953. [PMID: 33954830 DOI: 10.1007/s00216-021-03345-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/03/2021] [Accepted: 04/13/2021] [Indexed: 11/26/2022]
Abstract
Novel spherical polymer nanoparticles were synthesized by hyperbranched polyethylenimine (hPEI) and 6-hydroxy-2-naphthaldehyde (HNA) via Schiff base reaction (one-pot reaction), which had great advantages in water solubility and green synthesis. Meanwhile, probe PEI-HNA could quickly detect Cu2+ in the range of 0-60 μM in 30 s with the detection limit of 243 nM. The fluorescence of PEI-HNA-Cu2+ could be recovered by the addition of S2- in 50 s with the detection limit of 227 nM. Based on the excellent optical properties, PEI-HNA has been used in the bioimaging of living cells with excellent cell penetrability and low toxicity. More importantly, PEI-HNA has been doped into filter paper, hydrogel, and nanofibrous film to prepare solid-phase sensors, displaying rapid response and excellent sensitivity. Moreover, the low-cost and simple preparation of these sensors offers great potential and possibilities for industrialization, which could help accelerate the development of sensors in environmental and biological fields.
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Affiliation(s)
- Jin Yang
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Weixing Chen
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China.
| | - Xinyu Chen
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Xi Zhang
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Hongwei Zhou
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Haotian Du
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Mingcheng Wang
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Yiting Ma
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China
| | - Xilang Jin
- School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, 710032, Shaanxi, China.
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Zhang H, Liu S. Mixing concentrated sulfuric acid and diethylenetriamine at room temperature: A rapid and facile approach to synthesize fluorescent carbon polymer hollow spheres as peroxidase mimics. J Colloid Interface Sci 2021; 582:405-411. [PMID: 32866807 DOI: 10.1016/j.jcis.2020.08.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 11/30/2022]
Abstract
Fluorescent carbon polymer nanomaterials driven by their important various applications are promising, however, their scalable usages are still hindered by the lack of facile and effective synthesis approaches. Herein, a rapid and facile approach is demonstrated for the preparation of fluorescent carbon polymer hollow spheres (CPHSs), which were synthesized by directly mixing concentrated sulfuric acid (H2SO4) and diethylenetriamine (DETA) at room temperature. Notably, both the solid powders and aqueous dispersion of CPHSs possess the fluorescence properties, similar with the reported carbon polymer dots. The formation of CPHSs could be attributed to the polymerization of DETA in the presence of H2SO4. The present strategy is universal and fluorescent nanomaterials could also be obtained by using hexamethylenetetramine or polyethylenepolayamine as precursors with the aid of concentrated H2SO4. Most importantly, the CPHSs possess peroxidase-like activity and can catalyze oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) to its one-electron oxidation product, providing a new method for colorimetric detection of H2O2.
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Affiliation(s)
- Haiyan Zhang
- School of Materials Science and Engineering, Jilin University, Changchun 130012, PR China
| | - Sen Liu
- College of Electronic Science and Engineering, Jilin University, Changchun 130012, PR China.
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"Turn-on" fluorometric probe for α-glucosidase activity using red fluorescent carbon dots and 3,3',5,5'-tetramethylbenzidine. Mikrochim Acta 2020; 187:498. [PMID: 32803321 DOI: 10.1007/s00604-020-04479-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022]
Abstract
A turn-on method for determining α-glucosidase activity is described using a chemical redox strategy in which the fluorescence of red fluorescent carbon dots (CDs) is modulated. The red fluorescent CDs were prepared using a solvothermal method with p-phenylenediamine and sodium citrate. The excitation and emission maxima of the CDs were 490 and 618 nm, respectively. Ce4+ ions catalyze the oxidation of the colorless substrate 3,3',5,5'-tetramethylbenzidine (TMB) to give a blue oxidized TMB product (oxTMB). Absorption by oxTMB overlaps with the red light emitted by the CDs because of the fluorescence inner filter effect; therefore the presence of oxTMB decreases the intensity of fluorescence emission by the CDs. However, hydrolysis of L-ascorbic acid-2-O-α-D-glucopyranosyl by the enzyme α-glucosidase causes formation of ascorbic acid . Ascorbic acid reduces oxTMB to TMB, so that the inner filter effect disappeared and the fluorescence recovered. The strategy allows α-glucosidase activity to be successfully determined down to 0.02 U mL-1 and gives a dynamic linear range of 0-5.5 U mL-1. The strategy is very selective for α-glucosidase activity in the presence of potentially interfering substances. The method has been successfully applied to the determination of α-glucosidase activity in spiked human serum samples and gave satisfactory results. Graphical Abstract Schematic of the method used to prepare the carbon dots and the mechanisms involved in determining α-glucosidase activity.
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Wang X, Zhang X, Cao H, Huang Y. A facile and rapid approach to synthesize uric acid-capped Ti3C2 MXene quantum dots for the sensitive determination of 2,4,6-trinitrophenol both on surfaces and in solution. J Mater Chem B 2020; 8:10837-10844. [DOI: 10.1039/d0tb02078h] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The UA@Ti3C2 QDs with blue light emission were synthesized by a simple and green microwave-assisted method, and used as a sensitive and selective probe for the detection of TNP both on surfaces and in solution.
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Affiliation(s)
- Xin Wang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University)
- Ministry of Education
- College of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
| | - Xiaodan Zhang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University)
- Ministry of Education
- College of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
| | - Haiyan Cao
- Key Laboratory of Chongqing Inorganic Special Functional Materials
- College of Chemistry and Chemical Engineering
- Yangtze Normal University
- Chongqing 408100
- China
| | - Yuming Huang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University)
- Ministry of Education
- College of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
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