51
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Du Q, Qu F, Mao B, Zhu S, You J. Turn-on fluorescent detection of melamine based on Ag nanoclusters–Hg2+ system. NEW J CHEM 2016. [DOI: 10.1039/c6nj01338d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The blue-emissive Ag nanoclusters could be quenched by Hg2+ and recovered by melamine.
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Affiliation(s)
- Qianqian Du
- The Key Laboratory of Life-Organic Analysis
- Qufu Normal University
- Qufu 273165
- China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine
| | - Fei Qu
- The Key Laboratory of Life-Organic Analysis
- Qufu Normal University
- Qufu 273165
- China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine
| | - Beibei Mao
- The Key Laboratory of Life-Organic Analysis
- Qufu Normal University
- Qufu 273165
- China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine
| | - Shuyun Zhu
- The Key Laboratory of Life-Organic Analysis
- Qufu Normal University
- Qufu 273165
- China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine
| | - Jinmao You
- The Key Laboratory of Life-Organic Analysis
- Qufu Normal University
- Qufu 273165
- China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine
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52
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Usmanov DT, Hiraoka K, Wada H, Morita S, Nonami H. Desorption of low-volatility compounds induced by dynamic friction between microdroplets and an ultrasonically vibrating blade. Analyst 2016; 141:1398-404. [DOI: 10.1039/c5an02215k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Friction plays an important role in desorption and/or ionization of nonvolatile compounds in mass spectrometry, e.g., sonic spray, easy ambient sonic-spray ionization, solvent-assisted inlet ionization, desorption electrospray, etc.
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Affiliation(s)
- D. T. Usmanov
- Clean Energy Research Center
- University of Yamanashi
- Kofu 400-8511
- Japan
- Institute of Ion-Plasma and Laser Technologies
| | - K. Hiraoka
- Clean Energy Research Center
- University of Yamanashi
- Kofu 400-8511
- Japan
| | - H. Wada
- Kyushu Okinawa Agricultural Research Center
- National Agriculture and Food Research Organization
- Chikugo
- Japan
| | - S. Morita
- Kyushu Okinawa Agricultural Research Center
- National Agriculture and Food Research Organization
- Chikugo
- Japan
| | - H. Nonami
- Plant Biophysics/Biochemistry Research Laboratory
- Faculty of Agriculture
- Ehime University
- Matsuyama
- Japan
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53
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Kaleeswaran P, Nandhini T, Pitchumani K. Naked eye sensing of melamine: aggregation induced recognition by sodium d-gluconate stabilised silver nanoparticles. NEW J CHEM 2016. [DOI: 10.1039/c5nj03083h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A simple, cost-effective sodium d-gluconate stabilised Ag NP system was developed and its sensing behavior towards melamine was studied.
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Affiliation(s)
- Palanichamy Kaleeswaran
- Department of Natural Products Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
| | - Thanasekaran Nandhini
- Department of Natural Products Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
| | - Kasi Pitchumani
- Department of Natural Products Chemistry
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625021
- India
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54
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Tian Y, Yu M, Chen J, Liu C, Shi J, Chen H, Jiang G. Real Time Online Correction of Mass Shifts and Intensity Fluctuations in Extractive Electrospray Ionization Mass Spectrometry. Anal Chem 2015; 87:11962-6. [DOI: 10.1021/acs.analchem.5b04372] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Yong Tian
- State
Key Laboratory of Environmental Chemistry and Ecotoxicology, Research
Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Miao Yu
- State
Key Laboratory of Environmental Chemistry and Ecotoxicology, Research
Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jian Chen
- Jiangxi
Key Laboratory for Mass Spectrometry and Instrumentation, College
of Chemistry, Biology and Material Sciences, East China University of Technology, Nanchang, Jiangxi 330013, China
| | - Chunxiao Liu
- State
Key Laboratory of Environmental Chemistry and Ecotoxicology, Research
Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jianbo Shi
- State
Key Laboratory of Environmental Chemistry and Ecotoxicology, Research
Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Huanwen Chen
- Jiangxi
Key Laboratory for Mass Spectrometry and Instrumentation, College
of Chemistry, Biology and Material Sciences, East China University of Technology, Nanchang, Jiangxi 330013, China
| | - Guibin Jiang
- State
Key Laboratory of Environmental Chemistry and Ecotoxicology, Research
Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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55
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Liu C, Zhu Y, Zhou Z, Yang J, Qi F, Pan Y. Ultrasonic nebulization extraction/low pressure photoionization mass spectrometry for direct analysis of chemicals in matrices. Anal Chim Acta 2015; 891:203-10. [PMID: 26388379 DOI: 10.1016/j.aca.2015.08.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/09/2015] [Indexed: 01/30/2023]
Abstract
A novel ultrasonic nebulization extraction/low-pressure photoionization (UNE-LPPI) system has been designed and employed for the rapid mass spectrometric analysis of chemicals in matrices. An ultrasonic nebulizer was used to extract the chemicals in solid sample and nebulize the solvent in the nebulization cell. Aerosols formed by ultrasonic were evaporated by passing through a transferring tube, and desolvated chemicals were ionized by the emitted light (10.6 eV) from a Krypton discharge lamp at low pressure (∼68 Pa). First, a series of semi/non-volatile compounds with different polarities, such as polycyclic aromatic hydrocarbons (PAHs), amino acids, dipeptides, drugs, nucleic acids, alkaloids, and steroids were used to test the system. Then, the quantification capability of UNE-LPPI was checked with: 1) pure chemicals, such as 9,10-phenanthrenequinone and 1,4-naphthoquinone dissolved in solvent; 2) soil powder spiked with different amounts of phenanthrene and pyrene. For pure chemicals, the correlation coefficient (R(2)) for the standard curve of 9,10-phenanthrenequinone in the range of 3 ng-20 μg mL(-1) was 0.9922, and the measured limits of detection (LOD) was 1 ng ml(-1). In the case of soil powder, linear relationships for phenanthrene and pyrene from 10 to 400 ng mg(-1) were obtained with correlation coefficients of 0.9889 and 0.9893, respectively. At last, the feasibility of UNE-LPPI for the detection of chemicals in real matrices such as tablets and biological tissues (tea, Citrus aurantium peel and sage (Salvia officinalis) leaf) were successfully demonstrated.
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Affiliation(s)
- Chengyuan Liu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China
| | - Yanan Zhu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China
| | - Zhongyue Zhou
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China; Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Jiuzhong Yang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China; Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Fei Qi
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China; Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Yang Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China.
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56
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Gu C, Lan T, Shi H, Lu Y. Portable Detection of Melamine in Milk Using a Personal Glucose Meter Based on an in Vitro Selected Structure-Switching Aptamer. Anal Chem 2015. [PMID: 26200202 DOI: 10.1021/acs.analchem.5b01085] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Melamine detection in milk and other foods has attracted much attention since the discovery that melamine-adulterated food causes severe kidney damage. Although many methods have been developed to detect melamine, few methods can provide quantitative results using an affordable and portable device that is suitable for home use or field application. To achieve this goal, we herein report the first in vitro selection of a melamine responsive aptamer using a structure-switching method. A personal glucose meter (PGM) based melamine sensor was designed and subsequently tested using the newly isolated aptamer. Conversion of melamine concentration to glucose amount was achieved by including an invertase-conjugated DNA that is complementary to part of the aptamer. Melamine binding triggers the release of the invertase-DNA conjugate, which hydrolyzes sucrose into glucose. The glucose produced is then measured directly using an off-the-shelf PGM. The described sensor shows high selectivity for melamine against several closely related melamine analogues, such as cyanuric acid, ammeline, and ammelide, and has low detection limits of 0.33 μM (or 41.1 ppb) in buffer and 0.53 μM (or 67.5 ppb) in 80% whole milk without any pretreatment. The detection limits meet the threshold of 2.5 ppm for non-infant-formula products and 1 ppm for melamine in infant milk products as defined by the U.S. Food and Drug Administration (FDA). In addition to the PGM sensor demonstrated here, the same aptamer can be converted into other types of sensors with different signal outputs, allowing portable detection of melamine under a variety of conditions.
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Affiliation(s)
- Chunmei Gu
- †State Key Joint Laboratory of ESPC, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | | | - Hanchang Shi
- †State Key Joint Laboratory of ESPC, School of Environment, Tsinghua University, Beijing 100084, P. R. China
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57
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Finete VDLM, Gouvêa MM, Marques FFDC, Pereira Netto AD. Validation of a method of high performance liquid chromatography with fluorescence detection for melamine determination in UHT whole bovine milk. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.12.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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58
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Wang H, Chen D, Yu L, Chang M, Ci L. One-step, room temperature, colorimetric melamine sensing using an in-situ formation of silver nanoparticles through modified Tollens process. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 137:281-285. [PMID: 25222324 DOI: 10.1016/j.saa.2014.08.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2013] [Revised: 04/12/2014] [Accepted: 08/24/2014] [Indexed: 06/03/2023]
Abstract
We have developed a rapid, sensitive, one-step, and selective colorimetric detection method for melamine (MEL) in milk powder based upon an in-situ formation of silver nanoparticles (AgNPs) through modified Tollens process at room temperature. The triazine ring N atoms of MEL molecule were strategically designed to complex the Ag(+) through electron donor-acceptor interaction. During the AgNPs formation procedure, the MEL molecule, which has been covalently bonded with the Ag(+) ions, was adsorbed to the surface of as-prepared AgNPs, resulting in the aggregation of the adjacent AgNPs with detectable decreases of absorption signal. The concentration of MEL can be determined with the naked eye or a UV-vis spectrometer at which the yellow-to-brown color change associated with aggregate enhancement takes place. This method enables rapid (less than 30 min) and sensitive (limit of detection, LOD, 10 nM) detection, and it was also able to discriminate MEL from sixteen other milk relevant coexisting compounds. This assay does not utilize organic cosolvents, enzymatic reactions, light-sensitive dye molecules, lengthy protocols, or sophisticated instrumentation thereby overcoming some of the limitations of conventional methods.
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Affiliation(s)
- Huiying Wang
- College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People's Republic of China.
| | - Dinglong Chen
- College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People's Republic of China; School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People's Republic of China.
| | - Longquan Yu
- College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People's Republic of China
| | - Ming Chang
- College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People's Republic of China
| | - Lijie Ci
- College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People's Republic of China
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59
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A fast and environmental friendly analytical procedure for determination of melamine in milk exploiting fluorescence quenching. Food Chem 2015; 169:314-9. [DOI: 10.1016/j.foodchem.2014.07.144] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 07/02/2014] [Accepted: 07/30/2014] [Indexed: 11/17/2022]
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60
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Forbes TP. Rapid detection and isotopic measurement of discrete inorganic samples using acoustically actuated droplet ejection and extractive electrospray ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2015; 29:19-28. [PMID: 25462359 DOI: 10.1002/rcm.7074] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/07/2014] [Accepted: 10/08/2014] [Indexed: 05/27/2023]
Abstract
RATIONALE The rapid detection, screening, and isotopic signature analysis of inorganics provide invaluable information for a variety of applications including explosive device detection, nuclear forensics, and environmental monitoring. The coupling of ultrasonic nebulization and extractive electrospray ionization (EESI) enabled the mass spectrometric (MS) detection and analysis of inorganics from microliter sample solution aliquots. METHODS Ultrasonic nebulization and acoustic pressure wave focusing within an array of exponential horn structures were utilized for the efficient atomization of discrete liquid samples ranging in volume from 3 μL to 10 μL pipetted aliquots. In conjunction with an electro-flow focusing source for extractive electrospray ionization (EESI), in-source collision-induced dissociation (CID) was utilized to enhance inorganic detection through fragmentation of adducts and reduction in chemical noise from organic compounds. RESULTS The investigated system enhanced detection of the singly charged elemental cation species and provided accurate measurements of isotopic distributions for a number of metal ions. The extent of CID demonstrated the competition between ligand loss from hydrate clusters and charge reduction from the doubly charged to singly charged cations for the alkaline earth metal ions of strontium and barium. Inorganics were also detected from complex matrices, including synthetic fingerprint material and sediment, without detriment to device operation. CONCLUSIONS The described system provides a versatile tool for the rapid detection, speciation, and isotopic identification of inorganic compounds at nanogram to sub-nanogram levels from microliter aliquots. Published in 2014. This article is a U.S. Government work and is in the public domain in the USA.
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Affiliation(s)
- Thomas P Forbes
- National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD, USA
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61
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Paterson S, de la Rica R. Solution-based nanosensors for in-field detection with the naked eye. Analyst 2015; 140:3308-17. [DOI: 10.1039/c4an02297a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanomaterials are revolutionising analytical applications with low-cost tests that enable detecting a target molecule in a few steps and with the naked eye.
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Affiliation(s)
- S. Paterson
- Centre for Molecular Nanometrology
- WestCHEM
- Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL
| | - R. de la Rica
- Centre for Molecular Nanometrology
- WestCHEM
- Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL
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62
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Kailasa SK, Wu HF. Electrospray ionization tandem mass spectrometry for rapid, sensitive and direct detection of melamine in dairy products. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.03.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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63
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Lu Q, Zhao J, Xue S, Yin P, Zhang Y, Yao S. A “turn-on” fluorescent sensor for ultrasensitive detection of melamine based on a new fluorescence probe and AuNPs. Analyst 2015; 140:1155-60. [DOI: 10.1039/c4an01847h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new fluorescence sensor for melamine was fabricated by combining a new fluorescent probe 7-(benzylamino)-9,9-dibutyl-9H-fluorene-2-carbaldehyde and AuNPs. This nanosensor has been applied to the determination of melamine in milk samples with satisfactory results.
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Affiliation(s)
- Qiujun Lu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
| | - Jiangna Zhao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
| | - Shanyan Xue
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
| | - Peng Yin
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
| | - Youyu Zhang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
| | - Shouzhuo Yao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education)
- College of Chemistry and Chemical Engineering
- Hunan Normal University
- Changsha 410081
- PR China
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64
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Xin JY, Zhang LX, Chen DD, Lin K, Fan HC, Wang Y, Xia CG. Colorimetric detection of melamine based on methanobactin-mediated synthesis of gold nanoparticles. Food Chem 2014; 174:473-9. [PMID: 25529708 DOI: 10.1016/j.foodchem.2014.11.098] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 10/21/2014] [Accepted: 11/16/2014] [Indexed: 02/01/2023]
Abstract
A simple and rapid field-portable colorimetric method for the detection of melamine in liquid milk was reported. Methanobactin (Mb) could reduce Au (III) to Au (0) and mediate the synthesis of gold nanoparticles (Au-NPs). Upon the addition of melamine, melamine interacted with oxazolone ring of Mb, which interrupted the formation of Au-NPs. Melamine could also stimulate the aggregation of formed Au-NPs. In this paper, these characteristics have been used to detect melamine in liquid milk by naked eyes observation with a detection limit of 5.56 × 10(-6)M (0.7 mg/kg). Further, the plasmon absorbance of the formed Au-NPs allowed the quantitative detection of melamine by UV-vis spectrometer. A linear correlation was existed between the absorbance and the melamine concentration ranging from 3.90 × 10(-7)M to 3.97 × 10(-6)M with a correlation coefficient of 0.9685. The detection limit (3σ) obtained by UV-vis spectrum was as low as 2.38 × 10(-7)M (i.e., 0.03 mg/kg).
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Affiliation(s)
- Jia-ying Xin
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China; State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China.
| | - Lan-xuan Zhang
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China
| | - Dan-dan Chen
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China
| | - Kai Lin
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China
| | - Hong-chen Fan
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China
| | - Yan Wang
- Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, People's Republic of China
| | - Chun-gu Xia
- State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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Abstract
This chapter details the technique called extractive electrospray ionization (EESI) and describes its state-of-the-art developmental, mechanical and experimental aspects and shows its most important applications. EESI is a sensitive, matrix-tolerant secondary electrospray ionization technique, which is in the focus of ongoing investigations. The strength of EESI is its ability to ionize various compounds directly out of the sample without preparation or chromatographic separation. Although it appears to be not always the most sensitive method, it has shown enormous capabilities for various applications such as breath or skin analysis, the classification of perfumes, detection of melamine in milk and identification of the freshness of frozen meat or fruit.
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66
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Ni P, Dai H, Wang Y, Sun Y, Shi Y, Hu J, Li Z. Visual detection of melamine based on the peroxidase-like activity enhancement of bare gold nanoparticles. Biosens Bioelectron 2014; 60:286-91. [DOI: 10.1016/j.bios.2014.04.029] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Revised: 04/08/2014] [Accepted: 04/17/2014] [Indexed: 10/25/2022]
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67
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Du J, Zhu B, Peng X, Chen X. Optical reading of contaminants in aqueous media based on gold nanoparticles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:3461-3479. [PMID: 24578321 DOI: 10.1002/smll.201303256] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/14/2013] [Indexed: 06/03/2023]
Abstract
With increasing trends of global population growth, urbanization, pollution over-exploitation, and climate change, the safe water supply has become a global issue and is threatening our society in terms of sustainable development. Therefore, there is a growing need for a water-monitoring platform with the capability of rapidness, specificity, low-cost, and robustness. This review summarizes the recent developments in the design and application of gold nanoparticles (AuNPs) based optical assays to detect contaminants in aqueous media with a high performance. First, a brief discussion on the correlation between the optical reading strategy and the optical properties of AuNPs is presented. Then, we summarize the principle behind AuNP-based optical assays to detect different contaminants, such as toxic metal ion, anion, and pesticides, according to different optical reading strategies: colorimetry, scattering, and fluorescence. Finally, the comparison of these assays and the outlook of AuNP-based optical detection are discussed.
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Affiliation(s)
- Jianjun Du
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore; State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
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Li L, Schug KA. Continuous-flow extractive desorption electrospray ionization coupled to normal phase separations and for direct lipid analysis from cell extracts. J Sep Sci 2014; 37:2357-63. [DOI: 10.1002/jssc.201400361] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Revised: 06/01/2014] [Accepted: 06/02/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Li Li
- Department of Chemistry and Biochemistry; The University of Texas at Arlington; Arlington TX USA
| | - Kevin A. Schug
- Department of Chemistry and Biochemistry; The University of Texas at Arlington; Arlington TX USA
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69
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Habib A, Ninomiya S, Chen LC, Usmanov DT, Hiraoka K. Desorption mass spectrometry for nonvolatile compounds using an ultrasonic cutter. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1177-1180. [PMID: 24833356 DOI: 10.1007/s13361-014-0899-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/19/2014] [Accepted: 03/24/2014] [Indexed: 06/03/2023]
Abstract
In this work, desorption of nonvolatile analytes induced by friction was studied. The nonvolatile compounds deposited on the perfluoroalkoxy substrate were gently touched by an ultrasonic cutter oscillating with a frequency of 40 kHz. The desorbed molecules were ionized by a dielectric barrier discharge (DBD) ion source. Efficient desorption of samples such as drugs, pharmaceuticals, amino acids, and explosives was observed. The limits of detection for these compounds were about 1 ng. Many compounds were detected in their protonated forms without undergoing significant fragmentation. When the DBD was off, no ions for the neutral samples could be detected, meaning that only desorption along with little ionization took place by the present technique.
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Affiliation(s)
- Ahsan Habib
- Clean Energy Research Center, University of Yamanashi, Kofu, 400-8511, Japan
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70
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Zhou Y, Zhan J, Gao X, Li C, Chingin K, Le Z. The cation−anion interaction in ionic liquids studied by extractive electrospray ionization mass spectrometry. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Ionic liquids, known as green solvents, are of sustainable interest in modern chemistry, industry, and many other fields. Here, extractive electrospray ionization has been applied to transfer various room temperature ionic liquids into the gas phase for mass spectrometry analysis. Generated mass spectra display free cations (C+), anions (A–), and small salt clusters, such as C2A+ and CA2–, from strongly diluted ionic liquid samples (<10−8 mol/L) with high sensitivity and tolerance to chemical contamination. The eight ionic liquids based on the 1-butyl-3-methylimidazolium cation with different anions (OH–, HSO4–, Cl–, BF4–, AlCl4–, NO3–, Ac–, and PF6–) are investigated in the present work. Interestingly, the 1-butyl-3-methylimidazolium cation signal intensity is inversely correlated with the hydrogen bonding strength between the anion and cation. Our study indicates that the direct extractive electrospray ionization mass spectrometry analysis is a convenient method to screen ionic liquid libraries with regard to chemical composition, physicochemical properties, and supramolecular organization of ionic liquids.
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Affiliation(s)
- Yafei Zhou
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
| | - Junfeng Zhan
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
| | - Xiang Gao
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
| | - Cao Li
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
| | - Konstantin Chingin
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
| | - Zhanggao Le
- East China Institute of Technology, 418 Guanglan Road, Nanchang City, Jiangxi Province 330013, P.R. China
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71
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Zhu H, Li G, Huang G. Screening of complicated matrixes with paper assisted ultrasonic spray ionization mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:935-942. [PMID: 24664810 DOI: 10.1007/s13361-014-0862-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 01/24/2014] [Accepted: 02/17/2014] [Indexed: 06/03/2023]
Abstract
To analyze compounds in complicated matrixes using mass spectrometry, we describe a novel ambient ionization approach, termed paper assisted ultrasonic spray ionization (PAUSI). The ionization process is based on the ultrasonic vibration of the piezoelectric ceramic disk, on which the samples are placed. Porous materials are utilized to generate fine initial droplet, which could alleviate matrix effect during ionization process for complicated matrix. PAUSI was evaluated as an attractive tool to screen analytes from complicated matrixes, such as (1) bovine serum with NaCl 150 g/L, (2) viscous samples, and (3) biological fluid, without any sample preparation. Moreover, it provides great advantage in simplifying the mass spectrometry analysis process, and the ionization device is inexpensive and easy to operate.
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Affiliation(s)
- Hongying Zhu
- Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
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73
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Hazra C, Adusumalli VNKB, Mahalingam V. 3,5-Dinitrobenzoic acid-capped upconverting nanocrystals for the selective detection of melamine. ACS APPLIED MATERIALS & INTERFACES 2014; 6:7833-9. [PMID: 24742261 DOI: 10.1021/am5011089] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In this Research Article, we report for the first time the use of upconverting nanoparticles to detect melamine up to nanomolar concentration. Detection of melamine is important as it is one of the adulterant in protein rich food products due to its high nitrogen content. In this work, we have shown how the electron deficient 3,5-dinitrobenzoic acid (DNB)-coated Er/Yb-NaYF4 nanocrystals can specifically bind to electron rich melamine and alter the upconverting property of the nanocrystals. This selective binding led to the quenching of the upconversion emission from the nanocrystals. The high selectivity is verified by the addition of various analytes similar in structure with that of melamine. In addition, the selective quenching of the upconversion emission is reversible with the addition of dilute acid. This process has been repeated for more than five cycles with only a slight decrease in the sensing ability. The study was also extended to real milk samples, where the milk adulterated with melamine quenches the emission intensity of the DNB coated NaYF4:Er/Yb nanocrystals, whereas hardly any change is noted for the unadulterated milk sample. The high robustness and the sharp emission peaks make Er(3+)/Yb(3+)-doped NaYF4 nanocrystals a potential melamine sensing material over other organic fluorophores and nanocrystals possessing broad emissions.
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Affiliation(s)
- Chanchal Hazra
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER)-Kolkata , Mohanpur Campus, West Bengal 741252, India
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74
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Qian Z, Shan X, Chai L, Ma J, Chen J, Feng H. Si-doped carbon quantum dots: a facile and general preparation strategy, bioimaging application, and multifunctional sensor. ACS APPLIED MATERIALS & INTERFACES 2014; 6:6797-805. [PMID: 24707855 DOI: 10.1021/am500403n] [Citation(s) in RCA: 196] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Heteroatom doping of carbon quantum dots not only enables great improvement of fluorescence efficiency and tunability of fluorescence emission, but also provides active sites in carbon dots to broaden their application in sensor. Silicon as a biocompatible element offers a promising direction for doping of carbon quantum dots. Si-doped carbon quantum dots (SiCQDs) were synthesized through a facile and effective approach. The as-prepared Si-doped carbon quantum dots possess visible fluorescence with high quantum yield up to 19.2%, owing to fluorescence enhancement effect of introduced silicon atoms into carbon dots. The toxicity test on human Hela cells showed that SiCQDs have lower cellular toxicity than common CQDs, and bioimaging experiments clearly demonstrated their excellent biolabelling ability and outstanding performance in resistance to photobleaching. Strong fluorescence quenching effect of Fe(III) on SiCQDs can be used for its selective detection among general metal ions. Specific electron transfer between SiCQDs and hydrogen peroxide enables SiCQDs as a sensitive fluorescence sensing platform for hydrogen peroxide. The subsequent fluorescence recovery induced by removal of hydrogen peroxide from SiCQDs due to formation of the stable adducts between hydrogen peroxide and melamine was taken advantage of to construct effective sensor for melamine.
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Affiliation(s)
- Zhaosheng Qian
- College of Chemistry and Life Science, Zhejiang Normal University , Jinhua 321004, China
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75
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Dai H, Shi Y, Wang Y, Sun Y, Hu J, Ni P, Li Z. Label-free turn-on fluorescent detection of melamine based on the anti-quenching ability of Hg2+ to gold nanoclusters. Biosens Bioelectron 2014; 53:76-81. [DOI: 10.1016/j.bios.2013.09.034] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/10/2013] [Accepted: 09/12/2013] [Indexed: 01/24/2023]
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77
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Reactive extractive electrospray ionization tandem mass spectrometry for sensitive detection of tetrabromobisphenol A derivatives. Anal Chim Acta 2014; 814:49-54. [DOI: 10.1016/j.aca.2014.01.035] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 01/09/2014] [Accepted: 01/10/2014] [Indexed: 11/23/2022]
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78
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Lin SH, Lo TJ, Kuo FY, Chen YC. Real time monitoring of accelerated chemical reactions by ultrasonication-assisted spray ionization mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2014; 49:50-56. [PMID: 24446263 DOI: 10.1002/jms.3319] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 11/10/2013] [Accepted: 11/26/2013] [Indexed: 06/03/2023]
Abstract
Ultrasonication has been used to accelerate chemical reactions. It would be ideal if ultrasonication-assisted chemical reactions could be monitored by suitable detection tools such as mass spectrometry in real time. It would be helpful to clarify reaction intermediates/products and to have a better understanding of reaction mechanism. In this work, we developed a system for ultrasonication-assisted spray ionization mass spectrometry (UASI-MS) with an ~1.7 MHz ultrasonic transducer to monitor chemical reactions in real time. We demonstrated that simply depositing a sample solution on the MHz-based ultrasonic transducer, which was placed in front of the orifice of a mass spectrometer, the analyte signals can be readily detected by the mass spectrometer. Singly and multiply charged ions from small and large molecules, respectively, can be observed in the UASI mass spectra. Furthermore, the ultrasonic transducer used in the UASI setup accelerates the chemical reactions while being monitored via UASI-MS. The feasibility of using this approach for real-time acceleration/monitoring of chemical reactions was demonstrated. The reactions of Girard T reagent and hydroxylamine with steroids were used as the model reactions. Upon the deposition of reactant solutions on the ultrasonic transducer, the intermediate/product ions are readily generated and instantaneously monitored using MS within 1 s. Additionally, we also showed the possibility of using this reactive UASI-MS approach to assist the confirmation of trace steroids from complex urine samples by monitoring the generation of the product ions.
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Affiliation(s)
- Shu-Hsuan Lin
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, 300, Taiwan
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79
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Finete VDLM, Gouvêa MM, Marques FFDC, Netto ADP. Is it possible to screen for milk or whey protein adulteration with melamine, urea and ammonium sulphate, combining Kjeldahl and classical spectrophotometric methods? Food Chem 2013; 141:3649-55. [PMID: 23993532 DOI: 10.1016/j.foodchem.2013.06.046] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 06/06/2013] [Accepted: 06/12/2013] [Indexed: 11/18/2022]
Abstract
The Kjeldahl method and four classic spectrophotometric methods (Biuret, Lowry, Bradford and Markwell) were applied to evaluate the protein content of samples of UHT whole milk deliberately adulterated with melamine, ammonium sulphate or urea, which can be used to defraud milk protein and whey contents. Compared with the Kjeldahl method, the response of the spectrophotometric methods was unaffected by the addition of the nitrogen compounds to milk or whey. The methods of Bradford and Markwell were most robust and did not exhibit interference subject to composition. However, the simultaneous interpretation of results obtained using these methods with those obtained using the Kjeldahl method indicated the addition of nitrogen-rich compounds to milk and/or whey. Therefore, this work suggests a combination of results of Kjeldahl and spectrophotometric methods should be used to screen for milk adulteration by these compounds.
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Affiliation(s)
- Virgínia de Lourdes Mendes Finete
- Escola Politécnica de Saúde Joaquim Venâncio, Fundação Oswaldo Cruz, Av. Brasil, 4365, Manguinhos, CEP 21040-900, Rio de Janeiro, RJ, Brazil
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80
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Deng J, Yang Y. Chemical fingerprint analysis for quality assessment and control of Bansha herbal tea using paper spray mass spectrometry. Anal Chim Acta 2013; 785:82-90. [DOI: 10.1016/j.aca.2013.04.056] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 04/26/2013] [Accepted: 04/27/2013] [Indexed: 12/26/2022]
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81
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Li L, Yang SH, Lemr K, Havlicek V, Schug KA. Continuous flow-extractive desorption electrospray ionization: Analysis from “non-electrospray ionization-friendly” solvents and related mechanism. Anal Chim Acta 2013; 769:84-90. [DOI: 10.1016/j.aca.2013.01.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 01/07/2013] [Accepted: 01/11/2013] [Indexed: 11/25/2022]
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82
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Zhang M, Hu J. Indium Tin Oxide Electrode Modified by a NH2+Ion Implantation Technique for Determination of Melamine. ELECTROANAL 2013. [DOI: 10.1002/elan.201200614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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83
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Monge ME, Harris GA, Dwivedi P, Fernández FM. Mass Spectrometry: Recent Advances in Direct Open Air Surface Sampling/Ionization. Chem Rev 2013; 113:2269-308. [DOI: 10.1021/cr300309q] [Citation(s) in RCA: 404] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- María Eugenia Monge
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
| | - Glenn A. Harris
- Department
of Biochemistry and
the Mass Spectrometry Research Center, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Prabha Dwivedi
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
| | - Facundo M. Fernández
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332,
United States
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84
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Ma Y, Jiang L, Mei Y, Song R, Tian D, Huang H. Colorimetric sensing strategy for mercury(ii) and melamine utilizing cysteamine-modified gold nanoparticles. Analyst 2013; 138:5338-43. [DOI: 10.1039/c3an00690e] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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85
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Prior TJ, Armstrong JA, Benoit DM, Marshall KL. The structure of the melamine–cyanuric acid co-crystal. CrystEngComm 2013. [DOI: 10.1039/c3ce40709h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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86
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Ouyang Y, Zhang X, Han J, Guo X, Zhu Z, Chen H, Luo L. Thermal dissociation atmospheric chemical ionization ion trap mass spectrometry with a miniature source for selective trace detection of dimethoate in fruit juices. Analyst 2013. [DOI: 10.1039/c2an36244a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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87
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Zhu Z, Han J, Zhang Y, Zhou Y, Xu N, Zhang B, Gu H, Chen H. Sensitive ionization of non-volatile analytes using protein solutions as spray liquid in desorption electrospray ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:2770-2776. [PMID: 23124668 DOI: 10.1002/rcm.6387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
RATIONALE Desorption electrospray ionization (DESI) is the most popular ambient ionization technique for direct analysis of complex samples without sample pretreatment. However, for many applications, especially for trace analysis, it is of interest to improve the sensitivity of DESI-mass spectrometry (MS). METHODS In traditional DESI-MS, a mixture of methanol/water/acetic acid is usually used to generate the primary ions. In this article, dilute protein solutions were electrosprayed in the DESI method to create multiply charged primary ions for the desorption ionization of trace analytes on various surfaces (e.g., filter paper, glass, Al-foil) without any sample pretreatment. The analyte ions were then detected and structurally characterized using a LTQ XL mass spectrometer. RESULTS Compared with the methanol/water/acetic acid (49:49:2, v/v/v) solution, protein solutions significantly increased the signal levels of non-volatile compounds such as benzoic acid, TNT, o-toluidine, peptide and insulin in either positive or negative ion detection mode. For all the analytes tested, the limits of detection (LODs) were reduced to about half of the original values which were obtained using traditional DESI. The results showed that the signal enhancement is highly correlated with the molecular weight of the proteins and the selected solid surfaces. CONCLUSIONS The proposed DESI method is a universal strategy for rapid and sensitive detection of trace amounts of strongly bound and/or non-volatile analytes, including explosives, peptides, and proteins. The results indicate that the sensitivity of DESI can be further improved by selecting larger proteins and appropriate solid surfaces.
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Affiliation(s)
- Zhiqiang Zhu
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang, Jiangxi Province, 330013, PR China
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Sanji T, Nakamura M, Kawamata S, Tanaka M, Itagaki S, Gunji T. Fluorescence “Turn-On” Detection of Melamine with Aggregation-Induced-Emission-Active Tetraphenylethene. Chemistry 2012; 18:15254-7. [DOI: 10.1002/chem.201203081] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Indexed: 11/09/2022]
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89
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Mattarozzi M, Milioli M, Cavalieri C, Bianchi F, Careri M. Rapid desorption electrospray ionization-high resolution mass spectrometry method for the analysis of melamine migration from melamine tableware. Talanta 2012; 101:453-9. [DOI: 10.1016/j.talanta.2012.09.059] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/24/2012] [Accepted: 09/27/2012] [Indexed: 10/27/2022]
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90
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Liu S, Hu J, Zhang H, Su X. CuInS2 quantum dots-based fluorescence turn off/on probe for detection of melamine. Talanta 2012; 101:368-73. [DOI: 10.1016/j.talanta.2012.09.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 09/20/2012] [Accepted: 09/22/2012] [Indexed: 10/27/2022]
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91
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Wu B, Wang Z, Zhao D, Lu X. A novel molecularly imprinted impedimetric sensor for melamine determination. Talanta 2012; 101:374-81. [DOI: 10.1016/j.talanta.2012.09.044] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Revised: 09/20/2012] [Accepted: 09/22/2012] [Indexed: 10/27/2022]
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92
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Preparation of a magnetic molecularly imprinted polymer with pseudo template for rapid simultaneous determination of cyromazine and melamine in bio-matrix samples. Anal Bioanal Chem 2012; 404:1555-64. [DOI: 10.1007/s00216-012-6200-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 06/13/2012] [Accepted: 06/14/2012] [Indexed: 10/28/2022]
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93
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Padilla-Sánchez JA, Michael Thurman E, Plaza-Bolaños P, Ferrer I. Identification of pesticide transformation products in agricultural soils using liquid chromatography/quadrupole-time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:1091-1099. [PMID: 22467459 DOI: 10.1002/rcm.6206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
RATIONALE A study of pesticide transformation products (TPs) was carried out in soils of agricultural areas working under integrated pest management programs (IPMs). Bupirimate and cyromazine were the pesticides detected in soils after an initial pre-screening. The aim of this work was the identification of relevant TPs of these two pesticides. METHODS Soil samples were extracted by pressurized liquid extraction (PLE), using a mixture of ethyl acetate/methanol (3:1, v/v), and analyzed by ultra-high-pressure liquid chromatography coupled to hybrid quadrupole-time-of-flight mass spectrometry (UHPLC-QTOF-MS). For confirmation purposes, tandem mass spectrometry (MS(2) ) experiments were carried out using QTOF-MS, obtaining specific fragment structures of the pesticides and their degradates. RESULTS Retention times and exact masses of the protonated molecules were used for the identification of the pesticides bupirimate (m/z 317.1642) and cyromazine (m/z 167.1040) and their respective TPs, namely ethirimol (m/z 210.1601) and melamine (m/z 127.0727). A novel strategy using pseudo-MS(3) experiments was developed to confirm the structure of bupirimate TP (ethirimol). This strategy consists of generating the particular TP in the ion source, via collision-induced fragmentation, and then performing MS/MS to the fragment ion formed in-source. CONCLUSIONS Ethirimol and melamine were identified as degradation products of bupirimate and cyromazine, respectively. The study was applied to the analysis of 15 agricultural soil samples finding bupirimate and ethirimol in seven samples, cyromazine in one sample and melamine in four samples.
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Affiliation(s)
- Juan A Padilla-Sánchez
- Group Analytical Chemistry of Contaminants, Department of Hydrogeology and Analytical Chemistry (Andalusian Center for the Assessment and Monitoring of Global Change, CAESCG; Agrifood Campus of International Excellence, ceiA3), University of Almeria, E-04071, Almeria, Spain
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Abstract
Integrating the governing chemistry with the genomics and phenotypes of microbial colonies has been a "holy grail" in microbiology. This work describes a highly sensitive, broadly applicable, and cost-effective approach that allows metabolic profiling of live microbial colonies directly from a Petri dish without any sample preparation. Nanospray desorption electrospray ionization mass spectrometry (MS), combined with alignment of MS data and molecular networking, enabled monitoring of metabolite production from live microbial colonies from diverse bacterial genera, including Bacillus subtilis, Streptomyces coelicolor, Mycobacterium smegmatis, and Pseudomonas aeruginosa. This work demonstrates that, by using these tools to visualize small molecular changes within bacterial interactions, insights can be gained into bacterial developmental processes as a result of the improved organization of MS/MS data. To validate this experimental platform, metabolic profiling was performed on Pseudomonas sp. SH-C52, which protects sugar beet plants from infections by specific soil-borne fungi [R. Mendes et al. (2011) Science 332:1097-1100]. The antifungal effect of strain SH-C52 was attributed to thanamycin, a predicted lipopeptide encoded by a nonribosomal peptide synthetase gene cluster. Our technology, in combination with our recently developed peptidogenomics strategy, enabled the detection and partial characterization of thanamycin and showed that it is a monochlorinated lipopeptide that belongs to the syringomycin family of antifungal agents. In conclusion, the platform presented here provides a significant advancement in our ability to understand the spatiotemporal dynamics of metabolite production in live microbial colonies and communities.
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95
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Zhang Z, Cooks RG, Ouyang Z. Paper spray: a simple and efficient means of analysis of different contaminants in foodstuffs. Analyst 2012; 137:2556-8. [PMID: 22531392 DOI: 10.1039/c2an35196j] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and efficient ambient ionization method based on paper spray combined with tandem mass spectrometry allows rapid detection and quantitation of various contaminants (clenbuterol, melamine, plasticizer and sudan red) in various foodstuffs (e.g., meat, milk, sports drinks and chili powder).
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Affiliation(s)
- Zhiping Zhang
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
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96
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Direct analysis of biological samples using extractive electrospray ionization mass spectrometry (EESI-MS). Anal Bioanal Chem 2012; 403:2145-53. [DOI: 10.1007/s00216-012-5874-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 02/11/2012] [Accepted: 02/14/2012] [Indexed: 10/28/2022]
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97
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98
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Meier L, Berchtold C, Schmid S, Zenobi R. Extractive Electrospray Ionization Mass Spectrometry—Enhanced Sensitivity Using an Ion Funnel. Anal Chem 2012; 84:2076-80. [DOI: 10.1021/ac203022x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Lukas Meier
- Department of Chemistry and Applied
Biosciences, ETH Zurich, CH-8093 Zurich,
Switzerland
| | - Christian Berchtold
- Department of Chemistry and Applied
Biosciences, ETH Zurich, CH-8093 Zurich,
Switzerland
| | - Stefan Schmid
- Department of Chemistry and Applied
Biosciences, ETH Zurich, CH-8093 Zurich,
Switzerland
| | - Renato Zenobi
- Department of Chemistry and Applied
Biosciences, ETH Zurich, CH-8093 Zurich,
Switzerland
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99
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Ping H, Zhang M, Li H, Li S, Chen Q, Sun C, Zhang T. Visual detection of melamine in raw milk by label-free silver nanoparticles. Food Control 2012. [DOI: 10.1016/j.foodcont.2011.07.009] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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100
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Beltrán-Martinavarro B, Peris-Vicente J, Marco-Peiró S, Esteve-Romero J, Rambla-Alegre M, Carda-Broch S. Use of micellar mobile phases for the chromatographic determination of melamine in dietetic supplements. Analyst 2012; 137:269-74. [DOI: 10.1039/c1an15622e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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