1
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Lu Y, Wei X, Chen M, Wang J. Non-ceruloplasmin-bound copper and copper speciation in serum with extraction using functionalized dendritic silica spheres followed by ICP-MS detection. Anal Chim Acta 2023; 1251:340993. [PMID: 36925285 DOI: 10.1016/j.aca.2023.340993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/15/2023] [Accepted: 02/16/2023] [Indexed: 02/19/2023]
Abstract
The quantification of non-ceruloplasmin-bound copper (NCBC) and total copper in biological fluids is highly required for understanding the correlation of copper with various physiological processes and diseases. In the present work, we developed dendritic spherical silica particles functionalized with EDTA, shortly as DMSPs-EDTA, from the hydrolysis of tetraethyl orthosilicate with the aid of structure-directing agents and subsequent modification of EDTA. DMSPs-EDTA serves as adsorbent with abundant binding sites to facilitate efficient extraction of NCBC. The retained NCBC on DMSPs-EDTA may be readily recovered by stripping with HNO3 (2 mol L-1). By hyphenating with ICP-MS detection, it provides a limit of detection of 1.3 pmol for NCBC. The degradation of ceruloplasmin with 200 mmol L-1 H2O2 releases the bound copper as NCBC to distribute among other ligands, which may be efficiently retained by the adsorbent and facilitate the detection of total copper. The linear ranges of 0.21-10 μmol L-1 and 0.42-30 μmol L-1 were derived for the detection of NCBC and total copper. The recovery rates for spiked NCBC or total copper in serum were derived to be 97-108% and 94-102%, respectively. The analysis of serum for a healthy subject resulted in 1.8 μmol L-1 NCBC and 9.5 μmol L-1 total copper. In addition, the proportions of 8.5-12% for NCBC were derived from the serum of healthy adults, while those for the patients with lung, hepatocellular and esophageal carcinoma were found to be 10-12%, illustrating no obvious difference against the normal group.
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Affiliation(s)
- Yi Lu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, PR China
| | - Xing Wei
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, PR China
| | - Mingli Chen
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, PR China.
| | - Jianhua Wang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, PR China.
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2
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Kong D, Zhao J, Tang S, Shen W, Lee HK. Logarithmic Data Processing Can Be Used Justifiably in the Plotting of a Calibration Curve. Anal Chem 2021; 93:12156-12161. [PMID: 34455774 DOI: 10.1021/acs.analchem.1c02011] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The article is a response to a recent opinion piece that log concentration values should not be applied in analytical chemistry. An essential aim in the development of analytical chemistry methods is to obtain more sensitive and accurate detection values. For the application of chemical analysis methods, the obtained experiment data need to fit with the mathematical functions in the first place. As influenced by different detection principles and analytical methods, data can be displayed in a coordinate system with two linear axes for linear function fitting, or the data can first be taken through a logarithmic transformation and then for function fitting. Using raw data or data after logarithmic transformation primarily depends on analytical principles, without special rules of data formats. For example, ultraviolet-visible spectrophotometric data are more suitable for direct linear fitting. However, enzyme-catalyzed reaction or electrochemical data in logarithmic form are more appropriate for function fitting. This transformation of data form will not affect the soundness of fit statistics; rather, it simplifies the complexity of function analysis and calculation, which are the essence of analytical chemistry. In this brief article, we provide justification and legitimacy of the application of logarithmic processing in various fields of quantitative analytical chemistry.
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Affiliation(s)
- Dezhao Kong
- School of Grain Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China
| | - Jun Zhao
- School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China
| | - Sheng Tang
- School of Environment and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China
| | - Wei Shen
- School of Environment and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China
| | - Hian Kee Lee
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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3
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Wang H, Liu Z, Xiao J, Li C, Wang J, Xiao X, Huang H, Shrestha B, Tang L, Deng K, Zhou H. Visual Quantitative Detection of Glutathione and Cholesterol in Human Blood Based on the Thiol-Ene Click Reaction-Triggered Wettability Change of the Interface. Anal Chem 2021; 93:7292-7299. [PMID: 33956419 DOI: 10.1021/acs.analchem.1c00830] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Herein, we proposed an innovative visual quantitative sensing strategy based on thiol-ene click chemistry and the capillary action principle. A triethoxyvinylsilane (VTEO)- or mercaptopropylsilatrane (MPS)-modified interface was prepared for analyte recognition. Target analyte molecules containing thiol groups or C═C double bonds are coupled to the VTEO- or MPS-modified inner surface of the glass capillary tube via a thiol-ene click reaction, respectively. Then, the molecular recognition events were transformed into the wettability change of the inner wall of the glass capillary. The concentration of the target molecules was quantified by reading the height change of the water column in the capillary tube. As a proof of concept, this strategy was successfully used to build visual quantitative sensors for detecting glutathione and cholesterol. In addition, this strategy showed a good anti-interference ability to complex biological fluids and realized sensitive glutathione (GSH) and cholesterol detection in real human blood samples.
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Affiliation(s)
- Hao Wang
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education; Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers; Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion; Function Film Engineering Research Center of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, P. R. China.,School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Zhang Liu
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Jing Xiao
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Chunxiang Li
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Jinglun Wang
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education; Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers; Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion; Function Film Engineering Research Center of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, P. R. China.,School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Xiaojuan Xiao
- Molecular Biology Research Center & Hunan Province Key Laboratory of Basic and Applied Hematology, School of Life Sciences, Central South University, Changsha 410013, P. R. China
| | - Haowen Huang
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education; Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers; Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion; Function Film Engineering Research Center of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Binita Shrestha
- Department of Biomedical Engineering, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Liang Tang
- Department of Biomedical Engineering, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Keqin Deng
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education; Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers; Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion; Function Film Engineering Research Center of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, P. R. China.,School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Hu Zhou
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education; Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers; Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion; Function Film Engineering Research Center of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, P. R. China.,School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
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4
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Tan F, Yang Y, Xie X, Wang L, Deng K, Xia X, Yang X, Huang H. Prompting peroxidase-like activity of gold nanorod composites by localized surface plasmon resonance for fast colorimetric detection of prostate specific antigen. Analyst 2018; 143:5038-5045. [PMID: 30234206 DOI: 10.1039/c8an00664d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The interaction between incident light and surface electrons in conductive nanoparticles produces localized plasmon oscillations with a resonant frequency that strongly depends on the composition, size, geometry, and dielectric environment. Hybrid heterostructure materials combining two or more materials in one structure represent a powerful way to achieve unique properties and multifunctionality compared to those of the individual nanoparticle components. Hybrid gold nanorods and gold nanoclusters (GNR/AuNCs) heterostructures prepared by intimate integration of GNRs with AuNCs exhibit both localized surface plasmon resonance (LSPR) property and peroxidase-like activity. It is found that the catalytic activity of the AuNC/GNR heterostructure could be remarkably enhanced by LSPR induced by photon-plasmon coupling in the visible to near-infrared (NIR) region. Meanwhile, the catalytic activity of enzyme-like AuNC/GNRs may be regulated by immunoreactions to realize specific recognition of a target analyte. Accordingly, a fast colorimetric assay within 5 min for the detection of prostate specific antigen (PSA) was developed based on a AuNC/GNRs heterostructure mask regulated by the target molecule under photon-plasmon coupling. The color intensity is inversely proportional to the PSA concentration, and quantitative analysis may be achieved in a range of 10 and 200 pg mL-1. This sensor was practically applied to detect PSA levels in prostate cancer serum samples and the determined values agreed well with those measured by the hospital using standard methods. This indicates that the AuNC/GNRs heterostructure-based assay has high accuracy for the analysis of practical samples. Moreover, the new method has the advantages of very fast determination and low sample volume requirements.
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Affiliation(s)
- Fang Tan
- Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
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5
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Zhou J, Cao Z, Panwar N, Hu R, Wang X, Qu J, Tjin SC, Xu G, Yong KT. Functionalized gold nanorods for nanomedicine: Past, present and future. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.08.020] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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6
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Abbasi S, Khani H. Highly selective and sensitive method for Cu 2+ detection based on chiroptical activity of L-Cysteine mediated Au nanorod assemblies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 186:76-81. [PMID: 28614752 DOI: 10.1016/j.saa.2017.05.064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 05/06/2017] [Accepted: 05/29/2017] [Indexed: 06/07/2023]
Abstract
Herein, we demonstrated a simple and efficient method to detect Cu2+ based on amplified optical activity in the chiral nanoassemblies of gold nanorods (Au NRs). L-Cysteine can induce side-by-side or end-to-end assembly of Au NRs with an evident plasmonic circular dichroism (PCD) response due to coupling between surface plasmon resonances (SPR) of Au NRs and the chiral signal of L-Cys. Because of the obvious stronger plasmonic circular dichrosim (CD) response of the side-by-side assembly compared with the end-to-end assemblies, SS assembled Au NRs was selected as a sensitive platform and used for Cu2+ detection. In the presence of Cu2+, Cu2+ can catalyze O2 oxidation of cysteine to cystine. With an increase in Cu2+ concentration, the L-Cysteine-mediated assembly of Au NRs decreased because of decrease in the free cysteine thiol groups, and the PCD signal decreased. Taking advantage of this method, Cu2+ could be detected in the concentration range of 20pM-5nM. Under optimal conditions, the calculated detection limit was found to be 7pM.
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Affiliation(s)
| | - Hamzeh Khani
- Department of Chemistry, Ilam University, Ilam, Iran
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7
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Weng H, Yan B. A Eu(III) doped metal-organic framework conjugated with fluorescein-labeled single-stranded DNA for detection of Cu(II) and sulfide. Anal Chim Acta 2017; 988:89-95. [DOI: 10.1016/j.aca.2017.07.061] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 07/24/2017] [Accepted: 07/28/2017] [Indexed: 10/19/2022]
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8
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Gu Y, Song J, Li MX, Zhang TT, Zhao W, Xu JJ, Liu M, Chen HY. Ultrasensitive MicroRNA Assay via Surface Plasmon Resonance Responses of Au@Ag Nanorods Etching. Anal Chem 2017; 89:10585-10591. [PMID: 28872300 DOI: 10.1021/acs.analchem.7b02920] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Quantification of trace serum circulate microRNAs is extremely important in clinical diagnosis but remains a great challenge. Herein we developed an ultrasensitive platform for microRNA 141 (miR-141) detection based on a silver coated gold nanorods (Au@Ag NRs) etching process accompanied by surface plasmon resonance (SPR) shift. Both SPR absorption and scattering responses were monitored. Combined amplification cascades of catalyzed hairpin assembly (CHA) and hybridization chain reaction (HCR) with the sensitive SPR responses of plasmonic Au@Ag NRs, the proposed bioassay exhibited ultrahigh sensitivity toward miRNA-141 with dynamic range from 5.0 × 10-17 M to 1.0 × 10-11 M. With target concentration higher than 1.0 × 10-13 M, the color of the solution changed obviously that could be observed with naked eyes. Under dark-field microscopy observation of individual particle, a limit of detection down to 50 aM could be achieved. Owing to the superior sensitivity and selectivity, the proposed method was applied to detecting trace microRNA in serum. Similar SPR assays could be developed simply by redesigning the switching aptamer for the detections of other microRNAs or targets such as small molecule, DNA, or protein. Considering the convenient operation, good performance and simple observation modes of this method, it may have great potential in trace bioanalysis for clinical applications.
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Affiliation(s)
- Yu Gu
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Juan Song
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Mei-Xing Li
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Ting-Ting Zhang
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Wei Zhao
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Jing-Juan Xu
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
| | - Maili Liu
- : State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Centre for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences , Wuhan, 430071, China
| | - Hong-Yuan Chen
- : State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing, 210023, China
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9
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Liu W, Hou S, Yan J, Zhang H, Ji Y, Wu X. Quantification of proteins using enhanced etching of Ag coated Au nanorods by the Cu(2+)/bicinchoninic acid pair with improved sensitivity. NANOSCALE 2016; 8:780-784. [PMID: 26669539 DOI: 10.1039/c5nr07924a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Plasmonic nanosensors show great potential in ultrasensitive detection, especially with the plasmon peak position as the detection modality. Herein, a new sensitive but simple total protein quantification method termed the SPR-BCA assay is demonstrated by combining plasmonic nanosensors with protein oxidation by Cu(2+). The easy tuning of localized surface plasmon resonance (LSPR) features of plasmonic nanostructures makes them ideal sensing platforms. We found that the Cu(2+)/bicinchoninic acid (BCA) pair exhibits accelerated etching of Au@Ag nanorods and results in the LSPR peak shift. A linear relationship between Cu(2+) and the LSPR shift is found in a double logarithmic coordinate. Such double logarithm relationship is transferred to the concentration of proteins. Theoretical simulation shows that Au nanorods with large aspect ratios and small core sizes show high detection sensitivity. Via optimized sensor design, we achieved an increased sensitivity (the limit of detection was 3.4 ng ml(-1)) and a wide working range (0.5 to 1000 μg ml(-1)) compared with the traditional BCA assay. The universal applicability of our method to various proteins further proves its potential in practical applications.
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Affiliation(s)
- Wenqi Liu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China. and University of the Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Shuai Hou
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China. and University of the Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Jiao Yan
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China. and University of the Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Hui Zhang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China. and University of the Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Yinglu Ji
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.
| | - Xiaochun Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China.
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10
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Optical sensing and biosensing based on non-spherical noble metal nanoparticles. Anal Bioanal Chem 2015; 408:2813-25. [DOI: 10.1007/s00216-015-9203-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 11/13/2015] [Accepted: 11/18/2015] [Indexed: 01/01/2023]
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11
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Li S, Xu L, Ma W, Kuang H, Wang L, Xu C. Triple Raman Label-Encoded Gold Nanoparticle Trimers for Simultaneous Heavy Metal Ion Detection. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:3435-9. [PMID: 25846815 DOI: 10.1002/smll.201403356] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 03/08/2015] [Indexed: 05/28/2023]
Abstract
Here, a triple Raman label-encoded gold nanoparticle (AuNP) trimer is fabricated for heavy metal ion detection. In the presence of target ions, the gold nanoparticles modified with different Raman labels are assembled into trimers and produce different enhancements of Raman reporters, which are functionalized as Raman probes for simultaneous silver and mercury ion detection. Under optimized conditions, the limits of detection of Ag(+) and Hg(2+) reach 8.42 × 10(-12) and 16.78 × 10(-12) m, respectively.
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Affiliation(s)
- Si Li
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
| | - Liguang Xu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
| | - Wei Ma
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
| | - Hua Kuang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
| | - Libing Wang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
| | - Chuanlai Xu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, P. R. China
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12
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Tang S, Chang Y, Chia GH, Lee HK. Selective extraction and release using (EDTA-Ni)-layered double hydroxide coupled with catalytic oxidation of 3,3',5,5'-tetramethylbenzidine for sensitive detection of copper ion. Anal Chim Acta 2015; 885:106-13. [PMID: 26231895 DOI: 10.1016/j.aca.2015.05.029] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 05/12/2015] [Accepted: 05/15/2015] [Indexed: 10/23/2022]
Abstract
Copper is an important heavy metal in various biological processes. Many methods have been developed for detecting of copper ions (Cu(2+)) in aqueous samples. However, an easy, cheap, selective and sensitive method is still desired. In this study, a selective extraction-release-catalysis approach has been developed for sensitive detection of copper ion. Ethylenediaminetetraacetic acid (EDTA) chelated with nickel ion (Ni(2+)) were intercalated in a layered double hydroxide via a co-precipitation reaction. The product was subsequently applied as sorbent in dispersive solid-phase extraction for the enrichment of Cu(2+) at pH 6. Since Cu(2+) has a stronger complex formation constant with EDTA, Ni(2+) exchanged with Cu(2+) selectively. The resulting sorbent containing Cu(2+) was transferred to catalyze the 3,3',5,5'-tetramethylbenzidine oxidation reaction, since Cu(2+) could be released by the sorbent effectively and has high catalytic ability for the reaction. Blue light emitted from the oxidation product was measured by ultraviolet-visible spectrophotometry for the determination of Cu(2+). The extraction temperature, extraction time, and catalysis time were optimized. The results showed that this method provided a low limit of detection of 10nM, a wide linear range (0.05-100μM) and good linearity (r(2)=0.9977). The optimized conditions were applied to environmental water samples. Using Cu(2+) as an example, this work provided a new and interesting approach for the convenient and efficient detection of metal cations in aqueous samples.
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Affiliation(s)
- Sheng Tang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yuepeng Chang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Guo Hui Chia
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Hian Kee Lee
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore; National University of Singapore Environmental Research Institute, T-Lab Building #02-01, 5A Engineering Drive 1, Singapore 117411, Singapore; Tropical Marine Science Institute, National University of Singapore, S2S, 18 Kent Ridge Road, Singapore 119227, Singapore.
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13
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Wen T, Hou S, Yan J, Zhang H, Liu W, Ji Y, Wu X. l-Cysteine-induced chiroptical activity in assemblies of gold nanorods and its use in ultrasensitive detection of copper ions. RSC Adv 2014. [DOI: 10.1039/c4ra07642g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ultrasensitive detection of Cu2+is achieved based onl-cysteine-induced chiroptical activity in assemblies of gold nanorods.
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Affiliation(s)
- Tao Wen
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- University of the Chinese Academy of Sciences
- Beijing 100190, P. R. China
| | - Shuai Hou
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- University of the Chinese Academy of Sciences
- Beijing 100190, P. R. China
| | - Jiao Yan
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- University of the Chinese Academy of Sciences
- Beijing 100190, P. R. China
| | - Hui Zhang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- University of the Chinese Academy of Sciences
- Beijing 100190, P. R. China
| | - Wenqi Liu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
- University of the Chinese Academy of Sciences
- Beijing 100190, P. R. China
| | - Yinglu Ji
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
| | - Xiaochun Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology
- National Center for Nanoscience and Technology
- Beijing 100190, P. R. China
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