1
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Guo Y, Wang R, Wei C, Li Y, Fang T, Tao T. Carbon quantum dots for fluorescent detection of nitrite: A review. Food Chem 2023; 415:135749. [PMID: 36848836 DOI: 10.1016/j.foodchem.2023.135749] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 01/31/2023] [Accepted: 02/17/2023] [Indexed: 02/22/2023]
Abstract
NO2- is commonly found in foods and the environment, and excessive intake of NO2- poses serious hazards to human health. Thus, rapid and accurate assay of NO2- is of considerable significance. Traditional instrumental approaches for detection of NO2- faced with limitations of expensive instruments and complicated operations. Current gold standards for sensing NO2- are Griess assay and 2,3-diaminonaphthalene assay, which suffer from slow detection kinetics and bad water solubility. The newly emerged carbon quantum dots (CQDs) exhibit integrated merits including easy fabrication, low-cost, high quantum yield, excellent photostability, tunable emission behavior, good water solubility and low toxicity, which make CQDs be widely applied to fluorescent assay of NO2-. In this review, synthetic strategies of CQDs are briefly presented. Advances of CQDs for fluorescent detection of NO2- are systematically highlighted. Lastly, the challenges and perspectives in the field are discussed.
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Affiliation(s)
- Yongming Guo
- School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China.
| | - Ruiqing Wang
- School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Chengwei Wei
- School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Yijin Li
- Reading Academy, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Tiancheng Fang
- School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Tao Tao
- School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China.
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2
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A smartphone-adaptable dual-signal readout chemosensor for rapid detection of nitrite in food samples. J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2023.105179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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3
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Yilmaz MD. A novel ratiometric and colorimetric probe for rapid and ultrasensitive detection of nitrite in water based on an Acenaphtho[1,2-d] imidazole derivative. Anal Chim Acta 2021; 1166:338597. [PMID: 34022992 DOI: 10.1016/j.aca.2021.338597] [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: 01/07/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 10/21/2022]
Abstract
The concentration of nitrite (NO2-) ions above allowable limits in water resources and food stuffs is considered hazardous and has been proven to be of great threat to the environment and public health. In this work, an acenaphtho [1,2-d] imidazole derivative (1) as a ratiometric colorimetric probe is developed. UV-Vis experiments demonstrate that the probe 1 shows excellent selectivity toward NO2- in the presence of other potential interfering species, a rapid response (20 s) and a low detection limit (100 nM) by a distinct visual color change with a bathochromic shift of 120 nm from colorless to intense yellow. Besides, this probe is further used for the quantification of nitrite ions in environmental water resources such as tap water, underground water, and surface water samples. The high recoveries (96-99% with relative standard deviations (RSD) of <2.0%) make the probe 1 a promising candidate for practical applications in daily life in the detection of nitrite ions.
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Affiliation(s)
- M Deniz Yilmaz
- Department of Bioengineering, Faculty of Engineering and Architecture, Konya Food and Agriculture University, 42080, Konya, Turkey; Research and Development Center for Diagnostic Kits (KIT-ARGEM), Konya Food and Agriculture University, 42080, Konya, Turkey.
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4
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Yoon SJ, Nam YS, Lee JY, Kim JY, Lee Y, Lee KB. Highly sensitive colorimetric determination of nitrite based on the selective etching of concave gold nanocubes. Mikrochim Acta 2021; 188:132. [PMID: 33745002 DOI: 10.1007/s00604-021-04772-7] [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: 12/07/2020] [Accepted: 02/22/2021] [Indexed: 12/20/2022]
Abstract
Concave gold nanocubes are viable optical nanoprobes for the determination of nitrite ions. Herein, a novel approach was developed, based on the measurement of localized surface plasmon resonance absorption. The addition of nitrite ions selectively induced the etching of concave gold nanocubes, abrading the sharp vertices to spherical corners, which resulted in blue-shifted absorption accompanied by a color change from sapphire blue to light violet. The mechanism of selective etching of concave gold nanocube tips was elucidated by using X-ray photoelectron spectroscopy and atom probe tomography. The optimized detection of NO2- via the concave gold nanocube-based probe occurred at pH 3.0 and in 20 mM NaCl concentration at 40 °C. The absorption ratios (A550 nm/A640 nm) were proportional to the NO2- concentrations in the range 0.0-30 μM, with a detection limit of 38 nM (limit of quantitation of 0.12 μM and precision of 2.7%) in tap water. The highly selective and sensitive colorimetric assay has been successfully applied to monitor the nitrite ion concentrations in spiked tap water, pond water, commercial ham, and sausage samples.
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Affiliation(s)
- Su-Jin Yoon
- National Agenda Research Division, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.,University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Yun-Sik Nam
- Advanced Analysis Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Ji Young Lee
- Advanced Analysis Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Jin Young Kim
- Center for Pure Atmosphere Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Yeonhee Lee
- Advanced Analysis Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
| | - Kang-Bong Lee
- National Agenda Research Division, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea. .,University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon, 34113, Republic of Korea.
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5
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Yang L, Wang F, Zhao J, Kong X, Lu K, Yang M, Zhang J, Sun Z, You J. A facile dual-function fluorescent probe for detection of phosgene and nitrite and its applications in portable chemosensor analysis and food analysis. Talanta 2021; 221:121477. [PMID: 33076090 DOI: 10.1016/j.talanta.2020.121477] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 07/25/2020] [Accepted: 07/27/2020] [Indexed: 12/16/2022]
Abstract
Due to the potential threats of phosgene and nitrite to public health and safety, in this work, we first proposed the application of a facile dual-function fluorescent probe 2-(1H-Benzimidazol-2-yl)Aniline (BMA) for the detection of phosgene and nitrite in different solvent environments. BMA had fast response (1 min), high selectivity and sensitivity (the limit of detection was 1.27 nM) to phosgene in CH3CN solution (containing 10% DMSO), which manifested as a ratiometric fluorescent mode from 416 nm to 480 nm. The response of BMA to nitrite in HCl solution (pH = 1, containing 10% CH3CN) was also highly selective and sensitive (the limit of detection was 60.63 nM), which shown as a turn-off fluorescent mode at 485 nm. In addition, two portable chemosensors (BMA-loaded TLC plates and test strips) had also been successfully manufactured for the detection of phosgene in the gas phase and nitrite in solution, which displayed good responses. Most importantly, BMA had also been successfully used for detection of nitrite in food samples, and a good recovery (88.5%-107.2%) was obtained by adding standard sodium nitrite.
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Affiliation(s)
- Lei Yang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Feng Wang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Jie Zhao
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Xiaojian Kong
- School of Chemical New Material Engineering, Shandong Polytechnic College, Jining, 272027, China
| | - Ke Lu
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Mian Yang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Jin Zhang
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China
| | - Zhiwei Sun
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China.
| | - Jinmao You
- Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu, 273165, China; Key Laboratory of Tibetan Medicine Research & Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, 810001, China.
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6
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Zhang H, Lai H, Li G, Hu Y. 4-Aminothiophenol capped halloysite nanotubes/silver nanoparticles as surface-enhanced Raman scattering probe for in-situ derivatization and selective determination of nitrite ions in meat product. Talanta 2020; 220:121366. [DOI: 10.1016/j.talanta.2020.121366] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 06/14/2020] [Accepted: 06/15/2020] [Indexed: 01/03/2023]
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7
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Yu KK, Pan SL, Li K, Shi L, Liu YH, Chen SY, Yu XQ. A novel near-infrared fluorescent sensor for zero background nitrite detection via the "covalent-assembly" principle. Food Chem 2020; 341:128254. [PMID: 33039741 DOI: 10.1016/j.foodchem.2020.128254] [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: 04/26/2020] [Revised: 09/03/2020] [Accepted: 09/27/2020] [Indexed: 01/03/2023]
Abstract
Different chemical states of nitrogen are present in many freshwater and marine ecosystems, and nitrite ions are one of the most toxic water-soluble nitrogen species. Developing an effective and convenient sensing method to constantly detect the concentration of nitrite has become a wide concern. Here, a novel near-infrared fluorescent probe (AAC) was designed and synthesized via the "covalent assembly" principle, showing excellent selectivity and high sensitivity for nitrite. A new nitrite-quantitative method was established with the help of AAC, and the detection limit of nitrite using the new method was as low as 6.7 nM. AAC was successfully applied for the quantitative detection of nitrite in real-world environmental and food samples (including river water and Chinese sauerkraut), and the detection results were essentially identical to the results obtained from the traditional Griess assay. Moreover, AAC was successfully applied for tracking nitrite in Escherichia coli by fluorescence imaging. Since nitrite can have devastating effects, the method established with AAC allowed us to "see" effectively about the water quality, food quality, etc.
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Affiliation(s)
- Kang-Kang Yu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China; Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China.
| | - Sheng-Lin Pan
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China
| | - Kun Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China
| | - Lei Shi
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China
| | - Yan-Hong Liu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China
| | - Shan-Yong Chen
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China.
| | - Xiao-Qi Yu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry Sichuan University, 29, Wangjiang Road, Chengdu, Sichuan Province 610064, China.
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8
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Fast and sensitive fluorescent detection of nitrite based on an amino-functionalized MOFs of UiO-66-NH2. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121323] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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9
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Wang Q, He L, Zeng D, Zou W, Gong F, Xia J, Cao Z. Intrinsically ESIPT-exhibiting and enhanced emission in polymer nanoparticles as signaling for sensing nitrite. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 226:117654. [PMID: 31629981 DOI: 10.1016/j.saa.2019.117654] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
A straightforward approach to the fabrication of intrinsically excited-state intramolecular proton transfer (ESIPT)-fluorescent polymer nanoparticles (e-PNPs) was developed. The e-PNPs were obtained by self-assembly of the homopolymers derived from 4-aminosalicylic acid in aqueous solution. By incorporating ESIPT modules into polymer nanoparticles, the ESIPT reaction can be endowed with moderate hydrophobic micro-environment by nanoparticle scaffolds, eliciting enhanced ESIPT emission. The newly developed e-PNPs exhibit strong tautomeric fluorescence(e-FL), good photostability, low-toxicity and favourable biocompatibility in aqueous solution. Upon the addition of NO2-, the e-FL can be significantly quenched owing to the reaction of NO2- with the amide groups on e-PNPs. From this basis, the fluorescence detection of NO2- was implemented, which showed a linear relationship between 0 nM and 110 nM with a detection limit of 2.3 nM. Furthermore, e-PNPs were used as nanoprobes to monitor the NO2- levels in HeLa cells by fluorescence imaging, demonstrating the ability of discrimination from different concentrations of NO2-. The proposed method can be applied to a wide range of other ESIPT modules to integrate into polymer nanoparticles and offer highly sensitive nanosensing platform for bioanalysis and molecular imaging.
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Affiliation(s)
- Qinge Wang
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Lingzhi He
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Dan Zeng
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Wu Zou
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Fuchu Gong
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China.
| | - Jiaoyun Xia
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Zhong Cao
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China; Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology, Changsha, 410114, PR China
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10
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Jia J, Lu W, Li L, Gao Y, Jiao Y, Han H, Dong C, Shuang S. Orange-emitting N-doped carbon dots as fluorescent and colorimetric dual-mode probes for nitrite detection and cellular imaging. J Mater Chem B 2020; 8:2123-2127. [DOI: 10.1039/c9tb02934f] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel orange-emitting N-doped carbon dots (N-CDs) were prepared as fluorescent and colorimetric dual-mode probes for sensing nitrite (NO2−).
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Affiliation(s)
- Jing Jia
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Wenjing Lu
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Lin Li
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Yifang Gao
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Yuan Jiao
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Hui Han
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Chuan Dong
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
| | - Shaomin Shuang
- College of Chemistry and Chemical Engineering, and Institute of Environmental Science
- Shanxi University
- Taiyuan
- China
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11
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Xu Z, Shi W, Yang C, Xu J, Liu H, Xu J, Zhu B. A colorimetric fluorescent probe for rapid and specific detection of nitrite. LUMINESCENCE 2019; 35:299-304. [PMID: 31788982 DOI: 10.1002/bio.3727] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/22/2019] [Accepted: 05/19/2019] [Indexed: 12/18/2022]
Abstract
The method of fluorescent probes has been an important technique for detection of nitrite (NO2 - ). As an important inorganic salt, excessive nitrite would threaten humans and the environment. In this paper, a colorimetric fluorescent probe P-N (1,2-diaminoanthraquinone) with rapid response and high selectivity, which could detect NO2 - by visual colour changes and fluorescence spectroscopy is presented. The probe P-N solution (pH 1) changed from pink to colourless with the addition of NO2 - and fluorescence intensity at 639 nm clearly decreased. Good linear exists between fluorescence intensities and NO2 - concentrations for the range 0-16 μM, and the detection limit was 54 nM (based on a 3σ/slope). Moreover, probe P-N could also detect NO2 - in real water samples, and results were all satisfactory. Probe P-N shows great practical application value for detecting NO2 - in the environment.
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Affiliation(s)
- Zujun Xu
- School of Mathematics and Statistics, Ludong University, Yantai, China
| | - Wenxiu Shi
- School of Mathematics and Statistics, Ludong University, Yantai, China
| | - Chengjun Yang
- School of Mathematics and Statistics, Ludong University, Yantai, China
| | - Jing Xu
- School of Mathematics and Statistics, Ludong University, Yantai, China
| | - Huapeng Liu
- School of Mathematics and Statistics, Ludong University, Yantai, China
| | - Jing Xu
- School of Water Conservancy and Environment, University of Jinan, Shandong Provincial Engineering Technology Research Center for Ecological Carbon Sink and Capture Utilization, Jinan, China
| | - Baocun Zhu
- School of Water Conservancy and Environment, University of Jinan, Shandong Provincial Engineering Technology Research Center for Ecological Carbon Sink and Capture Utilization, Jinan, China
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12
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Wu J, Jiang L, Verwilst P, An J, Zeng H, Zeng L, Niu G, Kim JS. A colorimetric and fluorescent lighting-up sensor based on ICT coupled with PET for rapid, specific and sensitive detection of nitrite in food. Chem Commun (Camb) 2019; 55:9947-9950. [DOI: 10.1039/c9cc05048e] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A colorimetric and fluorogenic sensor exhibiting rapid, specific and sensitive detection of potentially toxic nitrite in food is described.
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Affiliation(s)
- Juanjuan Wu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin 300384
- P. R. China
- College of Light Industry and Food Engineering
| | - Lirong Jiang
- College of Light Industry and Food Engineering
- Guangxi University
- Nanning 530004
- P. R. China
| | | | - Jusung An
- Department of Chemistry
- Korea University
- Seoul 02841
- Korea
| | - Hongyan Zeng
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin 300384
- P. R. China
| | - Lintao Zeng
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion
- Tianjin University of Technology
- Tianjin 300384
- P. R. China
- College of Light Industry and Food Engineering
| | - Guangle Niu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
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13
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Detection of nitrite with a surface-enhanced Raman scattering sensor based on silver nanopyramid array. Anal Chim Acta 2018; 1040:158-165. [PMID: 30327106 DOI: 10.1016/j.aca.2018.08.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/15/2018] [Accepted: 08/09/2018] [Indexed: 01/22/2023]
Abstract
Nutrient pollution is of worldwide environmental and health concerns due to extensive use of nitrogen fertilizers and release of livestock waste, which induces nitrite compounds in aquatic systems. Herein a surface-enhanced Raman scattering (SERS) sensor is developed for nitrite detection based on coupling between the plasmonic gold nanostars and the silver nanopyramid array. When nitrite is present in the assay, an azo group is formed between the 1-naphthylamine-functionalized silver nanopyramids and the 4-aminothiophenol-functionalized gold nanostars. This not only generates the SERS spectral fingerprint for selective detection, but also creates "hot spots" at the gap between the Au nanostars and the Ag nanopyramids where the azo group is located, amplifying SERS signals remarkably. Finite-difference time-domain (FDTD) simulation shows a SERS enhancement factor of 4 × 1010 at the "hot spots". As a result, the SERS sensor achieves a limit of detection of 0.6 pg/mL toward nitrite in water, and enables nitrite detection in real-world river water samples. In addition, this sensor eliminates the use of any Raman reporter and any expensive molecular recognition probe such as antibody and aptamer. This highly sensitive, selective and inexpensive SERS sensor has unique advantages over colorimetric, electrochemical and fluorescent devices for small molecule detection.
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14
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Li Y, Zhang Y, al-karim Ali A, Danielson ND. Determination of Nitrite Through S-Nitrosocaptopril Formation and Fluorescent Derivatization of Remaining Captopril Using o-Phthalaldehyde and Glycine. ANAL LETT 2018. [DOI: 10.1080/00032719.2018.1484470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Youxin Li
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
| | - Ying Zhang
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
| | - Abd al-karim Ali
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
| | - Neil D. Danielson
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH, USA
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