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Guo X, Yao W, Bai S, Xiao J, Wei Y, Wang L, Yang J. A graphitic C 3N 4 nanocomposite-based fluorescence platform for label-free analysis of trace mercury ions. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:930-938. [PMID: 38258552 DOI: 10.1039/d3ay01880f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
In this study, a nanocomposite consisting of graphitic carbon nitride nanosheets loaded with graphitic carbon nitride quantum dots (CNQDs/CNNNs) was synthesized via a one-step pyrolysis method. This nanocomposite exhibited excellent thermal stability, photobleaching and salt resistance. Then a new fluorescence sensing platform based on CNQDs/CNNNs was constructed, which showed high sensitivity and selectivity towards trace mercury ions (Hg2+). By using X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra and density functional theory, the fluorescence response mechanism was elucidated where Hg2+ could interact with CNQDs/CNNNs, causing a structural change in the nanocomposite, further affecting its bandgap structure, and finally leading to fluorescence quenching. The linear range for detecting Hg2+ was found to be 0.025-4.0 μmol L-1, with a detection limit of 7.82 nmol L-1. This strategy provided the advantages of a rapid response and a broad detection range, making it suitable for quantitative detection of Hg2+ in environmental water.
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Affiliation(s)
- Xinrong Guo
- Dongguan Key Laboratory of Public Health Laboratory Science, School of Public Health, Guangdong Medical University, Dongguan 523808, People's Republic of China.
| | - Wen Yao
- Dongguan Key Laboratory of Public Health Laboratory Science, School of Public Health, Guangdong Medical University, Dongguan 523808, People's Republic of China.
| | - Silan Bai
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
| | - Junhui Xiao
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
| | - Yubo Wei
- School of Pharmaceutical Sciences, Yunnan Key Laboratory of Pharmacology for Natural Products, College of Modern Biomedical Industry, Kunming Medical University, People's Republic of China.
| | - Lishi Wang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
| | - Jie Yang
- Dongguan Key Laboratory of Public Health Laboratory Science, School of Public Health, Guangdong Medical University, Dongguan 523808, People's Republic of China.
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Jiang H, Li Y, Lv X, Deng Y, Li X. Recent advances in cascade isothermal amplification techniques for ultra-sensitive nucleic acid detection. Talanta 2023; 260:124645. [PMID: 37148686 PMCID: PMC10156408 DOI: 10.1016/j.talanta.2023.124645] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/30/2023] [Accepted: 05/03/2023] [Indexed: 05/08/2023]
Abstract
Nucleic acid amplification techniques have always been one of the hot spots of research, especially in the outbreak of COVID-19. From the initial polymerase chain reaction (PCR) to the current popular isothermal amplification, each new amplification techniques provides new ideas and methods for nucleic acid detection. However, limited by thermostable DNA polymerase and expensive thermal cycler, PCR is difficult to achieve point of care testing (POCT). Although isothermal amplification techniques overcome the defects of temperature control, single isothermal amplification is also limited by false positives, nucleic acid sequence compatibility, and signal amplification capability to some extent. Fortunately, efforts to integrating different enzymes or amplification techniques that enable to achieve intercatalyst communication and cascaded biotransformations may overcome the corner of single isothermal amplification. In this review, we systematically summarized the design fundamentals, signal generation, evolution, and application of cascade amplification. More importantly, the challenges and trends of cascade amplification were discussed in depth.
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Affiliation(s)
- Hao Jiang
- Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Yuan Li
- Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Xuefei Lv
- Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China.
| | - Yulin Deng
- Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Xiaoqiong Li
- Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
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Wang W, Ge Q, Zhao X. Enzyme-free isothermal amplification strategy for the detection of tumor-associated biomarkers: A review. Trends Analyt Chem 2023. [DOI: 10.1016/j.trac.2023.116960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Catalytic hairpin assembly as cascade nucleic acid circuits for fluorescent biosensor: design, evolution and application. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116582] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Qin C, Hu C, Yu A, Lai G. Fe 3O 4@polydopamine and Exo III-assisted homogeneous biorecognition reaction for convenient and ultrasensitive detection of kanamycin antibiotic. Analyst 2021; 146:1414-1420. [PMID: 33404555 DOI: 10.1039/d0an02187c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Herein, we report a Fe3O4@polydopamine (PDA) nanocomposite and exonuclease III (Exo III)-assisted homogeneous fluorescence biosensing method for ultrasensitive detection of kanamycin (Kana) antibiotic. A hairpin DNA containing the Kana-aptamer sequence (HP) was first designed for the highly specific biorecognition of the target analyte. Because of the aptamer biorecognition-induced structural change of HP and the highly effective catalyzed reaction of Exo III, a large amount of fluorophore labels were released from the designed fluorescence DNA probe. During the homogeneous reaction process, the Exo III-assisted dual recycling significantly amplified the fluorescence signal output. Moreover, the excessive probes were easily adsorbed and separated by the Fe3O4@PDA nanocomposite, which decreased the background signal and increased the signal-to-noise ratio. These strategies result in the excellent analytical performance of the method, including a very low detection limit of 0.023 pg mL-1 and a very wide linear range of six orders of magnitude. In addition, this method has convenient operation, excellent selectivity, repeatability and satisfactory reliability, and does not involve the design and utilization of complicated DNA sequences. Thus, it exhibits a promising prospect for practical applications.
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Affiliation(s)
- Chuanying Qin
- Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China.
| | - Cong Hu
- Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China.
| | - Aimin Yu
- Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
| | - Guosong Lai
- Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, PR China.
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Li Y, Luo Z, Zhang C, Sun R, Zhou C, Sun C. Entropy driven circuit as an emerging molecular tool for biological sensing: A review. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2020.116142] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Xing C, Chen Z, Zhang C, Wang J, Lu C. Target-directed enzyme-free dual-amplification DNA circuit for rapid signal amplification. J Mater Chem B 2020; 8:10770-10775. [PMID: 33185637 DOI: 10.1039/d0tb02114h] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dynamic DNA circuits have shown promising potential for amplified biosensing and bioengineering applications at the molecular level. Here, an enzyme-free, single-step and rapid signal amplification DNA circuit was developed by integrating target-directed entropy-driven catalysis (EDC) and hybridization chain reaction (HCR) for analysis of nucleic acids and small molecules. The target catalyzes the self-assembly of the EDC premade substrate complex and fuel strands to release the hidden amplicon trigger (T), which was encoded with trigger sequences for the downstream HCR circuit. The released T could motivate the successive cross-opening of HCR hairpins yielding long DNA nanowires and generated tremendously amplified fluorescence signals. Notably, this EDC-HCR circuit was driven by entropy without the requirement of any enzymes, thus greatly reducing the cost. The design of the hidden amplicon trigger (T) avoided the production of waste by-products and improved the reaction rate. Furthermore, as a modular circuit, we also demonstrated that our EDC-HCR cascade sensing system could be used as a versatile sensing platform for the highly sensitive and selective detection of other analysts, e.g. ATP in serum samples, through simply programming the reorganization sequences of the initiator. Therefore, the flexible and versatile EDC-HCR platform holds great potential in the fields of clinical diagnosis and biochemical analysis.
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Affiliation(s)
- Chao Xing
- Fujian Key Laboratory of Functional Marine Sensing Materials, Center for Advanced Marine Materials and Smart Sensors, Minjiang University, Fuzhou 350108, P. R. China.
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