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Xiao SJ, Huang J, Qiu AT, Liu GZ, Zhang L, Wu T, Shi YD, Qiu JD. Advanced "turn-on" colorimetric uranium platform based on the enhanced nanozyme activity of a donor-acceptor structured covalent organic framework. Anal Chim Acta 2024; 1302:342503. [PMID: 38580412 DOI: 10.1016/j.aca.2024.342503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 03/07/2024] [Accepted: 03/18/2024] [Indexed: 04/07/2024]
Abstract
BACKGROUND The increasing uranium containing wastes generated during uranium mining and finishing pose a huge threat to the environment and human health, and thus robust strategies for on-site monitoring of uranium pollutant are of great significance for environmental protection around uranium tailings. RESULTS Herein, a facile "turn-on" colorimetric platform that can achieve uranium detection by spectrometry and naked eyes was developed based on the uranium-enhanced nanozyme activity of covalent organic framework (JUC-505). Thanks to the extended π-conjugated skeleton and donor-acceptor (D-A) structure, JUC-505 exhibited superior photo-activated nanozyme activity, which would be prohibited when the cyano group in JUC-505 skeleton was transformed to the amidoxime group. Further results elucidated that the coordination of uranium with amidoxime groups led to the electron transfer between uranium and the JUC-505-AO skeleton, and thus significantly restored the nanozymatic activity of JUC-505-AO with the subsequent remarkable color changes. Moreover, the uranium concentrations in uranium tailing wastewater detected by the present "turn-on" colorimetric method were well agreed with those by ICP-MS, demonstrating a high accuracy of the present method in real samples. SIGNIFICANCE The D-A structured JUC-505 with superior photocatalytic property and nanozymatic activity was applied to facilitate colorimetric detection of uranium, which displays the advantages of low detection limit, excellent selectivity, fast response and simple operation for uranium detection in real samples, and shows a great potential in on-site monitoring of uranium pollutant around uranium tailings as well as nuclear power plant.
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Affiliation(s)
- Sai Jin Xiao
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Jing Huang
- School of Chemistry and Material Science, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - An Ting Qiu
- School of Chemistry and Material Science, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Guang Zhou Liu
- School of Chemistry and Material Science, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Li Zhang
- School of Chemistry and Chemical Engineering, Nanchang University, 330031, Jiangxi, China.
| | - Ting Wu
- School of Chemistry and Material Science, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Ya Di Shi
- School of Chemistry and Material Science, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Jian-Ding Qiu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, Jiangxi, China.
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Wang MP, Li HH, Wu T, Xiao SJ, Liu GZ, Zhang L. Photosensitized covalent organic framework as a light-induced oxidase mimic for colorimetric detection of uric acid. LUMINESCENCE 2024; 39:e4713. [PMID: 38515291 DOI: 10.1002/bio.4713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/26/2024] [Accepted: 02/16/2024] [Indexed: 03/23/2024]
Abstract
As large numbers of people are suffering from gout, an accurate, rapid, and sensitive method for the detection of gout biomarker, uric acid, is important for its effective control, diagnosis, and therapy. Although colorimetric detection methods based on uricase have been considered, they still have limitations as they produce toxic H2O2 and are expensive and not stable. Here, a novel uricase-free colorimetric method was developed for the sensitive and selective detection of uric acid based on the light-induced oxidase-mimicking activity of a new photosensitized covalent organic framework (COF) (2,4,6-trimethylpyridine-3,5-dicarbonitrile-4-[2-(4-formylphenyl)ethynyl]benzaldehyde COF [DCTP-EDA COF]). DCTP-EDA COF has a strong ability to harvest visible light, and it could catalyze the oxidation of 1,4-dioxane, 3,3',5,5'-tetramethylbenzidine under visible light irradiation to produce obvious color changes. With the addition of uric acid, however, the significant inhibition of the oxidase-mimicking activity of DCTP-EDA COF remarkably faded the color, and thus uric acid could be colorimetrically detected in the range of 2.0-150 μM with a limit of detection of 0.62 μM (3σ/K). Moreover, the present colorimetric method exhibited high selectivity; uric acid level in serum samples was successfully determined, and the recoveries ranged from 96.5% to 105.64%, suggesting the high accuracy of the present colorimetric method, which demonstrates great promise in clinical analysis.
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Affiliation(s)
- Meng Ping Wang
- School of Chemistry and Material Science, East China University of Technology, Nanchang, China
| | - Hui Han Li
- School of Chemistry and Material Science, East China University of Technology, Nanchang, China
| | - Ting Wu
- School of Chemistry and Material Science, East China University of Technology, Nanchang, China
| | - Sai Jin Xiao
- School of Chemistry and Material Science, East China University of Technology, Nanchang, China
| | - Guang Zhou Liu
- School of Chemistry and Material Science, East China University of Technology, Nanchang, China
| | - Li Zhang
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, China
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Xiao SJ, Qiu AT, Li HH, Wang MP, Zhang L, Guo KX, Guo J, Qiu JD. Simultaneous detection and separation of uranium based on a fluorescent amidoxime-functionalized covalent organic polymer. Spectrochim Acta A Mol Biomol Spectrosc 2023; 289:122182. [PMID: 36512967 DOI: 10.1016/j.saa.2022.122182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/07/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
To ensure the long-term sustainable development of nuclear energy as well as the prevention and control of uranium pollution, new materials that can simultaneously detect and separate uranium are still urgently needed. Herein, a new fluorescent covalent organic polymer (COP), namely HT-COP-AO, was synthesized andemployed as both the fluorescent probe and absorbent for simultaneous uranium detection and separationconsidering its excellent fluorescence property and strong uranium coordination ability. The results showed that the fluorescence of HT-COP-AO was quickly quenched by uranium within 2 min, and the limit of detection was 0.23 µM (3σ/K). Further studies implied that uranium was coordinated with the amidoxime groups of HT-COP-AO through U-N and O = U = O bonds, which resulted in electron transfer from uranium to HT-COP-AO and quenching the fluorescence of HT-COP-AO consequently. Meanwhile, HT-COP-AO exhibited excellent absorption ability towards uranium, and the maximum absorption capacity (qmax = 401.3 mg/g) was higher than most reported amidoxime modified materials. The HT-COP-AO also showed high selectivity for both uranium detection and separation which makes it a great promising for uranium monitoring in real water samples.
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Affiliation(s)
- Sai Jin Xiao
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - An Ting Qiu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Hui Han Li
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Meng Ping Wang
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Li Zhang
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, Jiangxi, China.
| | - Kai Xin Guo
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Jing Guo
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Jian-Ding Qiu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China.
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4
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Zheng ZJ, Zhang L, Wang LZ, Zhong ZQ, Xiong YT, Guo J, Zhang ZB, Cao XH, Xiao SJ. Ultrasensitive detection of UO 2 2+ based on dopamine-functionalized MoO x quantum dots. LUMINESCENCE 2021; 37:127-133. [PMID: 34730276 DOI: 10.1002/bio.4153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/17/2021] [Accepted: 10/25/2021] [Indexed: 11/11/2022]
Abstract
Uranium is an important nuclear fuel and the risk of human exposure to uranium increases as increasing amounts of uranium-containing waste enter the environment due to the rapid growth of nuclear power. Therefore, rapid, sensitive, and portable uranium detection is a promising approach to effectively control and monitor uranium contamination. To achieve this goal, abundant oxygen- and nitrogen-containing groups were introduced to molybdenum oxide quantum dot (MoOx QDs) surfaces with dopamine (DA) modification. Due to the excellent coordination ability of oxygen- and nitrogen-containing groups with uranium, the obtained DA-functionalized MoOx QDs (DA-MoOx QDs) showed a strong binding affinity for uranium and sensitivity was increased nearly 1000-fold compared with MoOx QDs alone. The limit of detection was 3.85 nM, which is higher than most of the reported nanomaterials. Moreover, the DA-MoOx QD-based method showed high selectivity and uranium could be clearly detected under masking with ethylenediaminetetraacetic acid even when the concentration of other metal ions was 100-fold higher than that of uranium, showing a very promising method for uranium contamination control and monitoring.
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Affiliation(s)
- Zhi Jian Zheng
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology (ECUT), Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Li Zhang
- College of Chemistry, Nanchang University, China
| | - Li Zhi Wang
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology (ECUT), Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Zu Qi Zhong
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Yu Tian Xiong
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Jing Guo
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Zhi Bin Zhang
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology (ECUT), Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Xiao Hong Cao
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology (ECUT), Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Sai Jin Xiao
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology (ECUT), Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
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5
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Affiliation(s)
- Sai Jin Xiao
- Jiangxi Key Laboratory of Mass Spectrometry and Instrumentation East China University of Technology (ECUT) Nanchang 330013 P. R. China
- School of Chemistry Biology and Material Science ECUT Nanchang 330013 P. R. China
| | - Li Zhi Wang
- School of Chemistry Biology and Material Science ECUT Nanchang 330013 P. R. China
| | - Ming Yue Yuan
- School of Chemistry Biology and Material Science ECUT Nanchang 330013 P. R. China
| | - Xiao Huan Huang
- School of Chemistry Biology and Material Science ECUT Nanchang 330013 P. R. China
| | - Jian Hua Ding
- Jiangxi Key Laboratory of Mass Spectrometry and Instrumentation East China University of Technology (ECUT) Nanchang 330013 P. R. China
- School of Chemistry Biology and Material Science ECUT Nanchang 330013 P. R. China
| | - Li Zhang
- College of Chemistry Nanchang University Nanchang 330031 P. R. China
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6
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Chu ZJ, Xiao SJ, Yuan MY, Wang LZ, Wang SP, Zhang GM, Zhang ZB. Rapid and sensitive detection of Mycobacterium tuberculosis based on strand displacement amplification and magnetic beads. LUMINESCENCE 2020; 36:66-72. [PMID: 32706457 DOI: 10.1002/bio.3918] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 07/06/2020] [Accepted: 07/16/2020] [Indexed: 11/10/2022]
Abstract
Tuberculosis is one of the main infectious diseases threatening public health, and the development of simple, rapid, and cost-saving methods for tuberculosis diagnosis is of profound importance for tuberculosis prevention and treatment. The bacterium Mycobacterium tuberculosis (MTB) is the pathogen that causes tuberculosis, and assaying for MTB is the only criterion for tuberculosis diagnosis. A new enzyme-free method based on strand displacement amplification and magnetic beads was developed for simple, rapid, and cost-saving MTB detection. Under optimum conditions, a good linear relationship could be observed between fluorescence and MTB specific DNA concentration ranging from 0.05 to 150 nM with a correlation coefficient of 0.993 (n = 8) and a detection limit of 47 pM (3σ/K). The present method also distinguished a one base mismatch from MTB specific DNA, showing great promise for MTB genome single base polymorphism analysis. MTB specific DNA content in polymerase chain reaction samples was successfully detected using the new method, and recoveries were 97.8-100.8%, indicating that the present method had high accuracy and shows good potential for the early diagnosis of tuberculosis.
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Affiliation(s)
- Zhao Jun Chu
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang, China
| | - Sai Jin Xiao
- Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang, China.,School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Ming Yue Yuan
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Li Zhi Wang
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Shan Ping Wang
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Guang Mei Zhang
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
| | - Zhi Bin Zhang
- School of Chemistry, Biology and Material Science, ECUT, Nanchang, China
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7
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Lin XJ, Fan XQ, Xiao SJ, He Y, Qi WJ, Hu PP, Tan QY, Tong XY, Huang CZ. Multifunctional fluorescent carbon dots inhibit the invasiveness of lung cancer cells. NEW J CHEM 2018. [DOI: 10.1039/c8nj02092b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of carbon dot (CD) is proposed, which has great potential to be an excellent fluorescent probe for bioimaging in vivo.
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Affiliation(s)
- Xiao Juan Lin
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing
- China
| | - Xiao Qing Fan
- Department of Thoracic Surgery
- Institute of Surgery Research
- Daping Hospital
- Army Medical University
- Chongqing 400042
| | - Sai Jin Xiao
- School of Chemistry, Biology and Material Science
- East China University of Technology
- Nanchang 330013
- China
| | - Yan He
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing
- China
| | - Wen Jing Qi
- Chongqing Key Laboratory of Green Synthesis and Applications
- College of Chemistry
- Chongqing Normal University
- Chongqing 401331
- China
| | - Ping Ping Hu
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing
- China
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
| | - Qun You Tan
- Department of Thoracic Surgery
- Institute of Surgery Research
- Daping Hospital
- Army Medical University
- Chongqing 400042
| | - Xiao Yong Tong
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing
- China
| | - Cheng Zhi Huang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- Southwest University
- Chongqing 400716
- China
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8
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Xin WS, Zhang F, Yan GR, Xu WW, Xiao SJ, Zhang ZY, Huang LS. A whole genome sequence association study for puberty in a large Duroc × Erhualian F2 population. Anim Genet 2017; 49:29-35. [PMID: 29194674 DOI: 10.1111/age.12623] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2017] [Indexed: 01/30/2023]
Abstract
A large proportion of gilts and sows are culled from reproduction populations because of anestrus and pubertal reproductive failure. Selecting early onset of puberty gilts has a favorable effect on sows' reproductivity. However, age at puberty is hard to be routinely measured in commercial herds. With molecular genetic predictors, identifying individuals that have a propensity for early onset of puberty can be simplified. We previously performed genome scanning and a genome-wide association study for puberty in an F2 resource population using 183 microsatellites and 62 125 SNPs respectively. The detection power and resolution of identified quantitative trait loci were very low. Herein, we re-sequenced 19 founders of the F2 resource population in high coverage, and whole genome sequences of F2 individuals were imputed to perform an association study for reproductive traits. A total of 2339 SNPs associated with pubertal reproductive failure were identified in the region of 30.94-40.74 Mb on SSC7, with the top one, positioned at 33.36 Mb, explaining 16% of the phenotypic variances. We improved the magnitude of the P-value by 10E+5 to 10E+7 using the whole genome sequence rather than using low/middle density markers as in previous studies, and we narrowed down the QTL confidence interval to 5.25 Mb. Combining the annotation of gene function, RAB23 and BAK1 were perceived as the most compelling candidate genes. The identified loci may be useful in culling sows failing to show estrus by marker-assisted selection to increase reproductive efficiency of swine herds.
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Affiliation(s)
- W S Xin
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - F Zhang
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - G R Yan
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - W W Xu
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - S J Xiao
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - Z Y Zhang
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
| | - L S Huang
- State Key Laboratory for Swine Genetics, Breeding and Production Technology, Jiangxi Agricultural University, Nanchang, 330045, China
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Xiao SJ, Zhao XJ, Chu ZJ, Xu H, Liu GQ, Huang CZ, Zhang L. New Off-On Sensor for Captopril Sensing Based on Photoluminescent MoO x Quantum Dots. ACS Omega 2017; 2:1666-1671. [PMID: 31457531 PMCID: PMC6640937 DOI: 10.1021/acsomega.7b00088] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 04/11/2017] [Indexed: 05/27/2023]
Abstract
Molybdenum oxide nanomaterials have recently attracted widespread attention for their unique optical properties and catalytic performance. However, until now, there is little literature on the application of photoluminescent molybdenum oxide nanomaterials in biological and pharmaceutical sensing. Herein, photoluminescent molybdenum oxide quantum dots (MoO x QDs) were synthesized via a facile method, and then, the synthesized MoO x QDs were further applied as a new type of photoluminescent probe to design a new off-on sensor for captopril (Cap) determination on the basis of the fact that the quenched photoluminescence of MoO x QDs by Cu2+ was restored with Cap through specific interaction between the thiol group of Cap and Cu2+. Under optimal conditions, the restored photoluminescence intensity showed a good linear relationship with the content of Cap, ranging from 1.0 to 150.0 μM, with a limit of detection of 0.51 μM (3σ/k). Additionally, the content of Cap in pharmaceutical samples was successfully detected with the newly developed off-on sensor, and the recoveries were 99.4-101.7%, which suggest that the present off-on sensor has a high accuracy.
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Affiliation(s)
- Sai Jin Xiao
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
| | - Xiao Jing Zhao
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
| | - Zhao Jun Chu
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
| | - Han Xu
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
| | - Guo Qing Liu
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
| | - Cheng Zhi Huang
- School
of Chemistry, Biology and Material Science and Jiangxi Key Laboratory of Mass
Spectrometry and Instrumentation, East China
University of Technology (ECUT), Nanchang 330013, Jiangxi
Province, China
- College
of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China
| | - Li Zhang
- College
of Chemistry, Nanchang University, Nanchang 330031, Jiangxi Province, China
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Xiao SJ, Zhao XJ, Hu PP, Chu ZJ, Huang CZ, Zhang L. Highly Photoluminescent Molybdenum Oxide Quantum Dots: One-Pot Synthesis and Application in 2,4,6-Trinitrotoluene Determination. ACS Appl Mater Interfaces 2016; 8:8184-91. [PMID: 26954663 DOI: 10.1021/acsami.5b11316] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
As a well-studied transition-metal semiconductor material, MoOx has a wider band gap than molybdenum disulfide (MoS2), and its property varies dramatically for the existence of several different allotropes and suboxide phases of molybdenum oxides (MoOx, x < 3). In this manuscript, a one-pot method possessing the advantages of one pot, easily prepared, rapid, and environmentally friendly, has been developed for facile synthesis of highly photoluminescent MoOx quantum dots (MoOx QDs), in which commercial molybdenum disulfide (MoS2) powder and hydrogen peroxide (H2O2) are employed as the precursor and oxidant, respectively. The obtained MoOx QDs can be further utilized as an efficient photoluminescent probe, and a new turn-off sensor is developed for 2,4,6-trinitrotoluene (TNT) determination based on the fact that the photoluminescence of MoOx QDs can be quenched by the Meisenheimer complexes formed in the strong alkali solution through the inner filter effect (IFE). Under the optimal conditions, the decreased photoluminescence of MoOx QDs shows a good linear relationship to the concentration of TNT ranging from 0.5 to 240.0 μM, and the limit of detection was 0.12 μM (3σ/k). With the present turn-off sensor, TNT in river water samples can be rapidly and selectively detected without tedious sample pretreatment processes.
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Affiliation(s)
| | | | - Ping Ping Hu
- Innovative Drug Research Centre, Chongqing University , Chongqing 401331, China
| | | | - Cheng Zhi Huang
- College of Pharmaceutical Sciences, Southwest University , Chongqing 400715, China
| | - Li Zhang
- College of Chemistry, Nanchang University , Nanchang 330031, China
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11
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Xiao SJ, Zhao XJ, Zuo J, Huang HQ, Zhang L. Highly photoluminescent MoO x quantum dots: Facile synthesis and application in off-on Pi sensing in lake water samples. Anal Chim Acta 2016; 906:148-155. [DOI: 10.1016/j.aca.2015.12.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 12/02/2015] [Accepted: 12/12/2015] [Indexed: 11/29/2022]
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12
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Liao XJ, Lia L, Zhang ZY, Long Y, Yang B, Ruan GR, Su Y, Ai HS, Zhang WC, Deng WY, Xiao SJ, Ren J, Ding NS, Huang LS. SUSCEPTIBILITY LOCI FOR UMBILICAL HERNIA IN SWINE DETECTED BY GENOME-WIDE ASSOCIATION. Genetika 2015; 51:1163-1170. [PMID: 27169231 DOI: 10.7868/s0016675815100100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Umbilical hernia (UH) is a complex disorder caused by both genetic and environmental factors. UH brings animal welfare problems and severe economic loss to the pig industry. Until now, the genetic basis of UH is poorly understood. The high-density 60K porcine SNP array enables the rapid application of genome-wide association study (GWAS) to identify genetic loci for phenotypic traits at genome wide scale in pigs. The objective of this research was to identify susceptibility loci for swine umbilical hernia using the GWAS approach. We genotyped 478 piglets from 142 families representing three Western commercial breeds with the Illumina PorcineSNP60 BeadChip. Then significant SNPs were detected by GWAS using ROADTRIPS (Robust Association-Detection Test for Related Individuals with Population Substructure) software base on a Bonferroni corrected threshold (P = 1.67E-06) or suggestive threshold (P = 3.34E-05) and false discovery rate (FDR = 0.05). After quality control, 29,924 qualified SNPs and 472 piglets were used for GWAS. Two suggestive loci predisposing to pig UH were identified at 44.25MB on SSC2 (rs81358018, P = 3.34E-06, FDR = 0.049933) and at 45.90MB on SSC17 (rs81479278, P = 3.30E-06, FDR = 0.049933) in Duroc population, respectively. And no SNP was detected to be associated with pig UH at significant level in neither Landrace nor Large White population. Furthermore, we carried out a meta-analysis in the combined pure-breed population containing all the 472 piglets. rs81479278 (P = 1.16E-06, FDR = 0.022475) was identified to associate with pig UH at genome-wide significant level. SRC was characterized as plausible candidate gene for susceptibility to pig UH according to its genomic position and biological functions. To our knowledge, this study gives the first description of GWAS identifying susceptibility loci for umbilical hernia in pigs. Our findings provide deeper insights to the genetic architecture of umbilical hernia in pigs.
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Long Y, Ruan GR, Su Y, Xiao SJ, Zhang ZY, Ren J, Ding NS, Huang LS. Genome-wide association study identifies QTLs for EBV of backfat thickness and average daily gain in Duroc pigs. Genetika 2015; 51:371-378. [PMID: 26027376 DOI: 10.7868/s0016675814100087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Backfat thickness (BFT) and average daily gain (ADG) are two important economic traits in commercial swine production. Identifying QTLs and uncovering the molecular mechanism for BFT and ADG would greatly help to speed up the breeding progress. In current breeding program, EBV for these two traits are calculated and formulated a comprehensive breeding index, which then be used to improve pig performance. Using Illumina PorcineSNP60 BeadChip, a pilot genomewide association studies (GWAS) for BFT and ADG in 83 Duroc pigs were performed. A total of 31 genome-wise significant SN Ps were detected to be associated with BFT on SSC 4, 9, 11, 12 and 14, ten of which were coincident with previously reported QTL regions. There are two genome-wise loci prominently associated with ADG on SSC2 and SSC13, respectively. The two loci on SSC2 are well overlapped with the QTL regions previously reported. All the 31 significant SNPs associated with BFT are verified on 219 outbreed pigs, six SN Ps reach an extreme significant level and seven SNP reaches a significant level, CACNA1E and ACBD6 are chosen as positional candidate genes. Our findings not only confirmed previously findings, but also revealed a number of novel SNPs associated with BFT and ADG. Two positional candidate genes CACNA1E and ACBD6 were identified for further study. These results would facilitate the identification of causative genes for BFT and ADG.
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Zhang L, Xiao SJ, Zheng LL, Li YF, Huang CZ. Aptamer-mediated nanocomposites of semiconductor quantum dots and graphene oxide as well as their applications in intracellular imaging and targeted drug delivery. J Mater Chem B 2014; 2:8558-8565. [DOI: 10.1039/c4tb01310g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Fluorescent quantum dot–graphene oxide nanocomposites have been facilely fabricated and applied in bio-imaging and cell-targeted drug delivery.
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Affiliation(s)
- Li Zhang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- College of Pharmaceutical Sciences
- College of Chemistry and Chemical Engineering
- Southwest University
| | - Sai Jin Xiao
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- College of Pharmaceutical Sciences
- College of Chemistry and Chemical Engineering
- Southwest University
| | - Lin Ling Zheng
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- College of Pharmaceutical Sciences
- College of Chemistry and Chemical Engineering
- Southwest University
| | - Yuan Fang Li
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- College of Pharmaceutical Sciences
- College of Chemistry and Chemical Engineering
- Southwest University
| | - Cheng Zhi Huang
- Key Laboratory of Luminescent and Real-Time Analytical Chemistry
- Ministry of Education
- College of Pharmaceutical Sciences
- College of Chemistry and Chemical Engineering
- Southwest University
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Xiao SJ, Hu PP, Chen LQ, Zhen SJ, Peng L, Li YF, Huang CZ. A visual dual-aptamer logic gate for sensitive discrimination of prion diseases-associated isoform with reusable magnetic microparticles and fluorescence quantum dots. PLoS One 2013; 8:e53935. [PMID: 23393552 PMCID: PMC3564804 DOI: 10.1371/journal.pone.0053935] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 12/07/2012] [Indexed: 01/07/2023] Open
Abstract
Molecular logic gates, which have attracted increasing research interest and are crucial for the development of molecular-scale computers, simplify the results of measurements and detections, leaving the diagnosis of disease either "yes" or "no". Prion diseases are a group of fatal neurodegenerative disorders that happen in human and animals. The main problem with a diagnosis of prion diseases is how to sensitively and selectively discriminate and detection of the minute amount of PrP(Res) in biological samples. Our previous work had demonstrated that dual-aptamer strategy could achieve highly sensitive and selective discrimination and detection of prion protein (cellular prion protein, PrP(C), and the diseases associated isoform, PrP(Res)) in serum and brain. Inspired by the advantages of molecular logic gate, we further conceived a new concept for dual-aptamer logic gate that responds to two chemical input signals (PrP(C) or PrP(Res) and Gdn-HCl) and generates a change in fluorescence intensity as the output signal. It was found that PrP(Res) performs the "OR" logic operation while PrP(C) performs "XOR" logic operation when they get through the gate consisted of aptamer modified reusable magnetic microparticles (MMPs-Apt1) and quantum dots (QDs-Apt2). The dual-aptamer logic gate simplifies the discrimination results of PrP(Res), leaving the detection of PrP(Res) either "yes" or "no". The development of OR logic gate based on dual-aptamer strategy and two chemical input signals (PrP(Res) and Gdn-HCl) is an important step toward the design of prion diseases diagnosis and therapy systems.
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Affiliation(s)
- Sai Jin Xiao
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
- Jiangxi Key Laboratory of Mass Spectrometry and Instrumentation, Department of Applied Chemistry, East China Institute of Technology, Nanchang, Jiangxi Province, China
| | - Ping Ping Hu
- College of Life Science, Southwest University, Chongqing, China
| | - Li Qiang Chen
- College of Life Science, Southwest University, Chongqing, China
| | - Shu Jun Zhen
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
| | - Li Peng
- College of Life Science, Southwest University, Chongqing, China
| | - Yuan Fang Li
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
| | - Cheng Zhi Huang
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
- College of Pharmaceutical Sciences, Southwest University, Chongqing, China
- * E-mail:
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Xiao SJ, Hu PP, Xiao GF, Wang Y, Liu Y, Huang CZ. Label-free detection of prion protein with its DNA aptamer through the formation of T-Hg2+-T configuration. J Phys Chem B 2012; 116:9565-9. [PMID: 22823483 DOI: 10.1021/jp302522b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Though rapid tests were developed for mass screening of prion diseases in the last century, bovine spongiform encephalopathy (BSE) was still epidemic in some European countries. The main reason is that the sensitivity of such tests is insufficient for detecting animals that are incubating with prion diseases at the presymptomatic stage. Driven by this, in this contribution, we developed a novel sensitive label-free method taking advantage of DNA aptamer for prion proteins (PrP) detection through the formation of T-Hg(2+)-T configuration. In the presence of Hg(2+) ions, double-strand structures formed due to the strong binding affinity of Hg(2+) ions to the T bases of DNA aptamer, which dramatically enhanced the fluorescence of Syber Green I, a double-strand indicator. With the addition of prion protein, however, the specific interaction between prion protein and its aptamer forced the destruction of the double-strand structures, and thus the fluorescence of Syber Green I decreased. It was found that there is a linear relationship between the decreased fluorescence intensities and prion protein concentration ranging from 13.0 to 156.0 nmol/L. Compared with other methods, the method presented here holds the advantages of being label-free, rapid, highly sensitive, and selective, which shows great promise for clinical application.
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Affiliation(s)
- Sai Jin Xiao
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
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17
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Chen LQ, Xiao SJ, Hu PP, Peng L, Ma J, Luo LF, Li YF, Huang CZ. Aptamer-mediated nanoparticle-based protein labeling platform for intracellular imaging and tracking endocytosis dynamics. Anal Chem 2012; 84:3099-110. [PMID: 22423600 DOI: 10.1021/ac202810b] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Although nanoparticles have been widely used as optical contrasts for cell imaging, the complicated prefunctionalized steps and low labeling efficiency of nanoprobes greatly inhibit their applications in cellular protein imaging. In this study, we developed a novel and general strategy that employs an aptamer not only as a recognizer for protein recognition but also as a linker for nanoreporter targeting to specifically label membrane proteins of interest and track their endocytic pathway. With this strategy, three kinds of nanoparticles, including gold nanoparticles, silver nanoparticles, and quantum dots (QDs), have been successfully targeted to the membrane proteins of interest, such as nucleolin or prion protein (PrP(C)). The following investigations on the subcellular distribution with fluorescent immunocolocalization assay indicated that PrP(C)-aptamer-QD complexes most likely internalized into cytoplasm through a classical clathrin-dependent/receptor-mediated pathway. Further single-particle tracking and trajectory analysis demonstrated that PrP(C)-aptamer-QD complexes exhibited a complex dynamic process, which involved three types of movements, including membrane diffusion, vesicle transportation, and confined diffusion, and all types of these movements were associated with distinct phases of PrP(C) endocytosis. Compared with traditional multilayer methods, our proposed aptamer-mediated strategy is simple in procedure, avoiding any complicated probe premodification and purification. In particular, the new double-color labeling strategy is unique and significant due to its superior advantages of targeting two signal reporters simultaneously in a single protein using only one aptamer. What is more important, we have constructed a general and versatile aptamer-mediated protein labeling nanoplatform that has shown great promise for future biomedical labeling and intracellular protein dynamic analysis.
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Affiliation(s)
- Li Qiang Chen
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Pharmaceutical Sciences, Southwest University, Chongqing 400054, People's Republic of China
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Zhen SJ, Chen LQ, Xiao SJ, Li YF, Hu PP, Zhan L, Peng L, Song EQ, Huang CZ. Carbon nanotubes as a low background signal platform for a molecular aptamer beacon on the basis of long-range resonance energy transfer. Anal Chem 2011; 82:8432-7. [PMID: 20853851 DOI: 10.1021/ac100709s] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although holding the advantages of both an aptamer and a molecular beacon (MB), a molecular aptamer beacon (MAB) needs complicated and expensive modifications at both of its ends and usually has a high background signal because of the low energy transfer efficiency between the donor and the acceptor. To overcome these shortcomings, in this study, we develop a long-range resonance energy transfer (LrRET) system by separating the donor from the acceptor, wherein only one end of the MAB is fluorescently labeled and acts as the energy donor and multiwalled carbon nanotubes (MWCNTs) are introduced as the energy acceptor. To test the feasibility of the newly designed MAB system, adenosine triphosphate (ATP) has been employed as a proof-of-concept target. It is found that the fluorescence of the designed MAB is completely quenched by MWCNTs, supplying a very low background signal. Then the quenched fluorescence is recovered significantly with the addition of ATP, so that ATP can be detected in the range of 0.8-80 μM with a limit of detection of 0.5 μM (3σ). Compared with the conventional fluorescence resonance energy transfer, the efficiency of LrRET between the dye and MWCNTs is much higher. Since only one end of the MAB needs the modification, the present strategy is simple and cost-effective. Furthermore, the use of MWCNTs can greatly reduce the fluorescence background of the MAB and supply a high sensitivity, showing its generality for detection of a variety of targets.
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Affiliation(s)
- Shu Jun Zhen
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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Xiao SJ, Hu PP, Wu XD, Zou YL, Chen LQ, Peng L, Ling J, Zhen SJ, Zhan L, Li YF, Huang CZ. Sensitive discrimination and detection of prion disease-associated isoform with a dual-aptamer strategy by developing a sandwich structure of magnetic microparticles and quantum dots. Anal Chem 2010; 82:9736-42. [PMID: 21038863 DOI: 10.1021/ac101865s] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The major challenge of prion disease diagnosis at the presymptomatic stage is how to sensitively or selectively discriminate and detect the minute quantity of disease-associated prion protein isoform (PrP(Res)) in complex biological systems such as serum and brain homogenate. In this contribution, we developed a dual-aptamer strategy by taking the advantages of aptamers, the excellent separation ability of magnetic microparticles (MMPs), and the high fluorescence emission features of quantum dots (QDs). Two aptamers (Apt1 and Apt2), which can recognize their two corresponding distinct epitopes of prion proteins (PrP), were coupled to the surfaces of MMPs and QDs, respectively, to make MMPs-Apt1 and QDs-Apt2 ready at first, which then could be coassociated together through the specific recognitions of the two aptamers with their two corresponding distinct epitopes of PrP, forming a sandwich structure of MMPs-Apt1-PrP-Apt2-QDs and displaying the strong fluorescence of QDs. Owing to the different binding affinities of the two aptamers with PrP(Res) and cellular prion protein (PrP(C)), both of which have distinct denaturing detergent resistance, our dual-aptamer strategy could be applied to discriminate PrP(Res) and PrP(C) successfully in serum. Further identifications showed that the present dual-aptamer assay could be successfully applied to the detection of PrP in 0.01% brain homogenate, about 1000-fold lower than that of commonly applied antibody-mediated assays, which can detect PrP just in 10% brain homogenate, indicating that the present designed dual-aptamer assay is highly sensitive and adequate for clinical diagnosis without isolation of target protein prior to assay.
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Affiliation(s)
- Sai Jin Xiao
- Education Ministry Key Laboratory on Luminescence Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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Zhang L, Chen H, Wang J, Li YF, Wang J, Sang Y, Xiao SJ, Zhan L, Huang CZ. Tetrakis(4-sulfonatophenyl)porphyrin-directed assembly of gold nanocrystals: tailoring the plasmon coupling through controllable gap distances. Small 2010; 6:2001-9. [PMID: 20715071 DOI: 10.1002/smll.201000354] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
It is known that universality and controllability over nanocrystal orientation must be accomplished to facilitate the potential applications of metal nanocrystals in the areas of photonics, electronics, and optics. The facile fabrication of linear chains of Au nanorods and bifurcated junctions of nanorods/nanospheres is achieved via the crosslinking of H-type tetrakis(4-sulfonatophenyl)porphyrin aggregates in solution. The tuning of the plasmon coupling between the Au nanocrystals is demonstrated by varying the porphyrin concentration and thus the interparticle gap distances. Finite-difference time-domain calculations show that the red shift of the plasmon band exhibits a nearly exponential decay with increasing interparticle gap distances, thus giving rise to a "plasmon ruler equation." The gap distances determined according to this equation agree well with the experimental observations and further confirm the porphyrin-directed assembly process. The interaction mechanism between the Au nanorods and porphyrins is further investigated by a biological procedure using the dark-field light scattering technique.
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Affiliation(s)
- Li Zhang
- College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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21
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Chen LQ, Xiao SJ, Peng L, Wu T, Ling J, Li YF, Huang CZ. Aptamer-based silver nanoparticles used for intracellular protein imaging and single nanoparticle spectral analysis. J Phys Chem B 2010; 114:3655-9. [PMID: 20112983 DOI: 10.1021/jp9104618] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Aptamer-adapted silver nanoparticles (Apt-AgNPs) were developed as a novel optical probe for simultaneous intracellular protein imaging and single nanoparticle spectral analysis, wherein AgNPs act as an illuminophore and the aptamer as a biomolecule specific recognition unit, respectively. It was found that streptavidin-conjugated and aptamer-functionalized AgNPs show satisfactory biocompatibility and stability in cell culture medium, and thus not only can act as a high contrast imaging agent for both dark-field light scattering microscope and TEM imaging but also can inspire supersensitive single nanoparticle spectra for potential intercellular microenvironment analysis. Further investigations showed that caveolae-related endocytosis is likely a necessary pathway for Apt-AgNPs labeled PrP(c) internalization in human bone marrow neuroblastoma cells (SK-N-SH cells). The integrated capability of Apt-AgNPs to be used as light scattering and TEM imaging agents, along with their potential use for single nanoparticle spectral analysis, makes them a great promise for future biomedical imaging and disease diagnosis.
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Affiliation(s)
- Li Qiang Chen
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, PR China
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Hu PP, Chen LQ, Liu C, Zhen SJ, Xiao SJ, Peng L, Li YF, Huang CZ. Ultra-sensitive detection of prion protein with a long range resonance energy transfer strategy. Chem Commun (Camb) 2010; 46:8285-7. [DOI: 10.1039/c0cc02600j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Xiao SJ, Hu PP, Li YF, Huang CZ, Huang T, Xiao GF. Aptamer-mediated turn-on fluorescence assay for prion protein based on guanine quenched fluophor. Talanta 2009; 79:1283-6. [PMID: 19635360 DOI: 10.1016/j.talanta.2009.05.040] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 05/21/2009] [Accepted: 05/26/2009] [Indexed: 12/01/2022]
Abstract
An aptamer-participated haprin structure was designed by employing cellular prion protein (PrP(C)) as a model protein, and thus an aptamer-mediated turn-on fluorescence assay for proteins was developed in this contribution. The designed aptamer-participated haprin structure consists of three segments. Namely, an aptamer sequence located in the loop, three guanine bases at 3'-terminal, and a fluophor modified at 5'-terminal. It was found that the guanine bases at the 3'-terminal could quench the fluorescence of the fluophor such as tetramethyl-6-carboxyrhodamine (TAMRA) at the 5'-terminal about 76.6% via electron transfer if the guanine bases are close enough to the fluophor, and the quenched fluorescence could get restored when the target protein is present since the interaction, which could be confirmed by measuring fluorescence lifetime, between TAMRA-aptamer and the target protein forces the guanines away from TAMRA so that TAMRA-modified aptamer changes into turn-on state. A linear relationship was then constructed between the turn-on fluorescence intensity and the concentration of PrP(C) in the range from 1.1 to 44.7 microg/mL with a limit of detection of 0.3 microg/mL (3sigma).
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Affiliation(s)
- Sai Jin Xiao
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, China
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Ding NS, Mao HR, Guo YM, Ren J, Xiao SJ, Wu GZ, Shen HQ, Wu LH, Ruan GF, Brenig B, Huang LS. A genome-wide scan reveals candidate susceptibility loci for pig hernias in an intercross between White Duroc and Erhualian. J Anim Sci 2009; 87:2469-74. [PMID: 19359506 DOI: 10.2527/jas.2008-1601] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Pig scrotal/inguinal and umbilical hernias are the most prevalent congenital disorders in pigs and often cause animal welfare problems and economic loss. To identify susceptibility loci for these traits, a genome-wide scan with 194 microsatellite markers covering the pig genome was performed in a White Duroc x Erhualian resource population with 23 scrotal/inguinal F(2) animals, 50 umbilical F(2) animals, and their unaffected siblings. A sex-average linkage map with a total length of 2,350.3 cM and an average marker interval of 12.84 cM was constructed. Both nonparametric genome-wide linkage (NPL) analysis and transmission disequilibrium test (TDT) were implemented to detect closely linked markers. The NPL analysis revealed 11 chromosomal regions on SSC1, 2, 3, 6, 7, 8, 10, and 11 for umbilical hernia and 5 regions on SSC2, 4, 8, 13, and 16 for scrotal/inguinal hernia, whereas the TDT test identified susceptibility loci for umbilical hernia on SSC1, 2, 4, 7, 10, 13, 14, and 15 and for scrotal/inguinal hernias on SSC2, 8, 10, and 18. The most promising loci were SWR1928 on SSC7 and SW830 on SSC10 for umbilical hernia, and SW933 on SSC8 for scrotal hernia, which were consistently detected by both NPL and TDT. Several previously reported chromosomal regions for scrotal/inguinal hernia were confirmed, and new evidence for linkage with this pig defect was found. Moreover, susceptibility loci for pig umbilical hernia were detected for the first time.
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Affiliation(s)
- N S Ding
- Key Laboratory for Animal Biotechnology of Jiangxi Province and the Ministry of Agriculture of China, Jiangxi Agricultural University, Nanchang, PR China
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Zhang L, Huang CZ, Li YF, Xiao SJ, Xie JP. Label-free detection of sequence-specific DNA with multiwalled carbon nanotubes and their light scattering signals. J Phys Chem B 2008; 112:7120-2. [PMID: 18489140 DOI: 10.1021/jp800092r] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A detection method for DNA sequence-specificity in a homogeneous medium is presented with multiwalled carbon nanotubes (MWCNTs) as optical probes on the basis of the measurements of light scattering signals. ssDNA can prevent MWCNTs from coagulation in electrolyte solution while dsDNA cannot, displaying different light scattering signals. With the light scattering signals, target DNA in the range of 8.6-86.4 nM could be detected and one base pair mismatch could be discriminated. The sequence specificity for the present method has been identified with PCR products.
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Affiliation(s)
- Li Zhang
- College of Chemistry and Chemical Engineering, MOE Key Laboratory of Luminescence and Real-Time Analysis, CQKL-LRTA, Southwest University, Chongqing, China
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Xiao SJ, Textor M, Spencer ND, Wieland M, Keller B, Sigrist H. Immobilization of the cell-adhesive peptide Arg-Gly-Asp-Cys (RGDC) on titanium surfaces by covalent chemical attachment. J Mater Sci Mater Med 1997; 8:867-872. [PMID: 15348806 DOI: 10.1023/a:1018501804943] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Surface modification of acid-pretreated titanium with 3-aminopropyltriethoxylsilane (APTES) in dry toluene resulted in covalently bonded siloxane films with surface coverage that was relatively controllable by regulating the reaction conditions. A hetero-bifunctional cross-linker, N-succinimidyl-3-maleimidopropionate (SMP), reacted with the terminal amino groups, forming the exposed maleimide groups. Finally, a model cell-binding peptide, Arg-Gly-Asp-Cys (RGDC), was immobilized on the surface through covalent addition of the cysteine thiol groups to the maleimide groups. X-ray photoelectron spectroscopy, radiolabelling techniques, and ellipsometry were used to quantify and characterize the modified surfaces.
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Affiliation(s)
- S J Xiao
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology, CH-8092 Zürich, Switzerland
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Hentz VR, Rosen JM, Xiao SJ, McGill KC, Abraham G. The nerve gap dilemma: a comparison of nerves repaired end to end under tension with nerve grafts in a primate model. J Hand Surg Am 1993; 18:417-25. [PMID: 8515008 DOI: 10.1016/0363-5023(93)90084-g] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The objective of this study was to compare, in a clinically relevant primate model, axon regeneration after epineurial repair under tension (15 mm gap) with interfascicular nerve grafts with the use of either standard microsuture techniques or a new interfascicular nerve graft technique termed fascicular tubulization that uses a hypoantigenic collagen membrane formed into a tube to approximate nerve ends. Electrophysiologic analysis demonstrated that the percentage of proximal axons that conducted across the repair site was greater in those nerves repaired under tension with epineurially placed sutures than in either of the tensionless repairs involving interfascicular graft techniques. The mean diameters of the regenerated axons repaired under tension with epineurial sutures were greater than those of the nerves repaired with interfascicular grafts, although the difference was not statistically significant. Interfascicular nerve grafting with tubulization using the current collagen tube resulted in regeneration equal to the sutured interfascicular nerve grafts. For modest defects (perhaps up to 3 to 4 cm in the adult), it seems advantageous to accept the modest tension associated with an epineurial repair rather than to use an autograft (or artificial graft) to achieve a tension-free repair.
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Affiliation(s)
- V R Hentz
- Stanford University Medical Center, Calif
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29
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Abstract
This study compared standard methods of nerve repair, epineurial or perineurial sutures with a technique termed fascicular tubulization using a biodegradable polyglycolic acid tube in a nonhuman primate model. Electrophysiologic analysis demonstrated that the percentage of proximal axons that conducted across the repair site did not significantly differ among the three techniques while epineurial suture repairs were associated with significantly longer conduction delays across the repair site compared with the other two techniques. Even though fascicular tubulization using the current polyglycolic acid tube resulted in regeneration equal to the currently perceived best suture repair technique, associated technical problems with the current tube design indicate that this fascicular tubulization technique cannot, at present, be considered as an alternative to present clinically used nerve suture techniques.
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Affiliation(s)
- V R Hentz
- Rehabilitation Research and Development Center, Veterans Administration Medical Center, Palo Alto, Calif
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