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Lu Z, Wang P, Xiong W, Qi B, Shi R, Xiang D, Zhai K. Simultaneous detection of mercury (II), lead (II) and silver (I) based on fluorescently labelled aptamer probes and graphene oxide. ENVIRONMENTAL TECHNOLOGY 2021; 42:3065-3072. [PMID: 31973648 DOI: 10.1080/09593330.2020.1721565] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Accepted: 01/17/2020] [Indexed: 06/10/2023]
Abstract
We have developed a fluorescence quantitative analysis method for the simultaneous detection of Hg2+, Pb2+ and Ag+ based on fluorescently labelled nucleic acid aptamer probes and graphene oxide (GO). By this method, three nucleic acid aptamer probes (PHg, PPb, PAg) were designed. The carboxyl fluorescein (FAM), tetramethyl-6-carboxyrhodamine (TAMRA) and cyanine-5 (Cy-5) were respectively selected as fluorophore of aptamer probes, and GO was chosen as quencher. In general, these probes were on free single-stranded state and adsorbed on the surface of GO via π-π interactions, which brought fluorophores of probes and GO into close proximity. Due to the fluorescence resonance energy transfer occurred between fluorophores and GO, the fluorescence was quenched and fluorescence signals were all weak. Under the optimal condition, fluorescence intensities of three fluorophores exhibited a good linear dependence on corresponding ions concentration. The detection limit for Hg2+, Pb2+ and Ag+ were 0.2, 0.5 and 2 nmol/L (3σ, n = 11). Average recoveries of this method were 97.56-104.92%, which indicated the method had a high accuracy and low detection limit. In addition, this proposed method has good selectivity, and there was no crosstalk effect among these probes.
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Affiliation(s)
- Zijing Lu
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
| | - Peng Wang
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
| | - Weiwei Xiong
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
| | - Baoping Qi
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
| | - Rujie Shi
- College of Biology and Food Engineering, Chongqing Three Gorges University, Chongqing, People's Republic of China
| | - Dongshan Xiang
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
| | - Kun Zhai
- School of Chemical and Environmental Engineering, Hubei Minzu University, Enshi, People's Republic of China
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, People's Republic of China
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Yasun E, Neff B, Trusty T, Boskic L, Mezić I. Electrokinetic mixing in electrode-embedded multiwell plates to improve the diffusion limited kinetics of biosensing platforms. Anal Chim Acta 2020; 1106:79-87. [PMID: 32145858 DOI: 10.1016/j.aca.2020.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 01/13/2020] [Accepted: 02/03/2020] [Indexed: 12/13/2022]
Abstract
Rapid and accurate biosensing with low concentrations of the analytes is usually challenged by the diffusion limited reaction kinetics. Thus, as a remedy, long incubation times or excess amounts of the reagents are employed to ensure the reactions to go to completion. Therefore, mixing becomes both a serious problem and necessity to overcome that diffusion limitation and homogenize the samples, especially for the biochemical reactions that take place in multiwell plates. Because the current mixing platforms such as shakers/vortexers, sonicators, magnetic stirrers and acoustic mixers have disadvantages including, but not limited to, being invasive/harfmul to the samples, causing the samples to splash out or stick to the walls of the wells and allowing foreign compartments to enter the solutions in the wells. Here we propose a noninvasive and safer (considering the risk of sample loss) technology that provides electrokinetic-mixing (EKM) of the reagents placed in electrode-embedded multiwell plates where the incubation times, or in other words, the time required for the desired molecules to meet in stationary solutions, can be reduced substantially. In order to demonstrate the power of this innovation, in this specific case, a simple Förster resonance energy transfer (FRET) based quenching bioplatform was adopted, where a molecular beacon DNA (MB) modified with sulfhydryl (-SH) and fluorescein (FITC) dye at opposite terminals was incubated with 10 nm sized gold nanoparticles (AuNPs) in the wells of an electrode-embedded multiwell plate, in which a printed circuit board (PCB) was attached at the bottom to control the liquid flows by EKM. When the MB binds to AuNPs through thiolate chemistry in the solution, FITC dye comes in close proximity to the AuNP surface and the emission is quenched via FRET principle. Thus, this quenching percentage over time was our comparison parameter for the mixing and no mixing cases to demonstrate the impact of mixing on the quenching kinetics. This reaction was conducted with different concentrations of AuNPs to observe the impact of mixing on MB quenching kinetics when the concentrations of the AuNPs were increased. Total quenching efficiency could go up to 90% in the presence of the AuNPs and it took about 60 min to reach stability. When the EKM was involved, fluorescence quenching time for the MBs could be reduced by up to 4.1 times. Thus, it was demonstrated that this technology may improve the kinetics of the diffusion limited biological reactions take place in multiwell plates substantially so that it may be adopted in various different sensing platforms for rapid measurements.
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Affiliation(s)
- Emir Yasun
- Department of Mechanical Engineering and Biological Nanostructures Laboratory, California NanoSystems Institute (CNSI), University of California, Santa Barbara, Santa Barbara, CA, 93106, USA.
| | - Baptiste Neff
- Department of Mechanical Engineering and Biological Nanostructures Laboratory, California NanoSystems Institute (CNSI), University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Travis Trusty
- Department of Mechanical Engineering and Biological Nanostructures Laboratory, California NanoSystems Institute (CNSI), University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Ljuboslav Boskic
- Department of Mechanical Engineering and Biological Nanostructures Laboratory, California NanoSystems Institute (CNSI), University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Igor Mezić
- Department of Mechanical Engineering and Biological Nanostructures Laboratory, California NanoSystems Institute (CNSI), University of California, Santa Barbara, Santa Barbara, CA, 93106, USA.
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The G-BHQ synergistic effect: Improved double quenching molecular beacons based on guanine and Black Hole Quencher for sensitive simultaneous detection of two DNAs. Talanta 2017; 174:289-294. [PMID: 28738581 DOI: 10.1016/j.talanta.2017.06.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 05/31/2017] [Accepted: 06/07/2017] [Indexed: 11/21/2022]
Abstract
We designed two double quenching molecular beacons (MBs) with simple structure based on guanine (G base) and Black Hole Quencher (BHQ), and developed a new analytical method for sensitive simultaneous detection of two DNAs by synchronous fluorescence analysis. In this analytical method, carboxyl fluorescein (FAM) and tetramethyl-6-carboxyrhodamine (TAMRA) were respectively selected as fluorophore of two MBs, Black Hole Quencher 1 (BHQ-1) and Black Hole Quencher 2 (BHQ-2) were respectively selected as organic quencher, and three continuous nucleotides with G base were connected to organic quencher (BHQ-1 and BHQ-2). In the presence of target DNAs, the two MBs hybridize with the corresponding target DNAs, the fluorophores are separated from organic quenchers and G bases, leading to recovery of fluorescence of FAM and TAMRA. Under a certain conditions, the fluorescence intensities of FAM and TAMRA all exhibited good linear dependence on their concentration of target DNAs (T1 and T2) in the range from 4 × 10-10 to 4 × 10-8molL-1 (M). The detection limit (3σ, n = 13) of T1 was 3 × 10-10M and that of T2 was 2×10-10M, respectively. Compared with the existing analysis methods for multiplex DNA with MBs, this proposed method based on double quenching MBs is not only low fluorescence background, short analytical time and low detection cost, but also easy synthesis and good stability of MB probes.
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Graphene oxide based fluorescence resonance energy transfer and loop-mediated isothermal amplification for white spot syndrome virus detection. J Biotechnol 2015; 212:44-9. [DOI: 10.1016/j.jbiotec.2015.08.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 08/06/2015] [Accepted: 08/10/2015] [Indexed: 11/24/2022]
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Song W, Wang X, Wang Q, Shao D, Wang X. Plasma-induced grafting of polyacrylamide on graphene oxide nanosheets for simultaneous removal of radionuclides. Phys Chem Chem Phys 2015; 17:398-406. [DOI: 10.1039/c4cp04289a] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
PAM/GO is a suitable material for simultaneous removal of metal ions from aqueous solutions.
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Affiliation(s)
- Wencheng Song
- School of Environment and Chemical Engineering
- North China Electric Power University
- Beijing 102206
- P. R. China
- Institute of Plasma Physics
| | - Xiangxue Wang
- Institute of Plasma Physics
- Chinese Academy of Sciences
- Hefei
- China
| | - Qi Wang
- Institute of Plasma Physics
- Chinese Academy of Sciences
- Hefei
- China
| | - Dadong Shao
- Institute of Plasma Physics
- Chinese Academy of Sciences
- Hefei
- China
| | - Xiangke Wang
- School of Environment and Chemical Engineering
- North China Electric Power University
- Beijing 102206
- P. R. China
- Faculty of Engineering
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