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Yang J, Zhang Y, Zhao J, Ma J, Yi C. Development of gold nanoparticles-aptamer nanocomposite for multiplexed analysis of antibiotics and design of molecular logic gates. NANOTECHNOLOGY 2021; 33:015501. [PMID: 34598169 DOI: 10.1088/1361-6528/ac2c41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
The widespread use of antibiotics caused severe problems of antibiotic residues in foodstuffs and water, posing a serious threat to public health and thus urging the development of sensitive, selective, and rapid detection methods for antibiotics. In this study, a fluorescence resonance energy transfer (FRET)-based system is developed for the multiplexed analysis of chloramphenicol (CAP) and streptomycin (Strep) with detection limits of 2.51 and 8.69μg l-1, respectively. The FRET-based system consists of Cy3-tagged anti-CAP aptamer-conjugated gold nanoparticles (AuNPs) (referred to as AuNPs-AptCAP) and Cy5-tagged anti-Strep aptamer-conjugated AuNPs (referred to as AuNPs-AptStrep). In addition, AuNPs-AptCAP and AuNPs-AptStrep have been demonstrated to serve as signal transducers for implementing a series of logic operations such as YES, NOT, INH, OR, (2-4)-Decoder and even more complicated multi-level logic gates (OR-INH). Based on the outputs of logic operations, it could be figured out whether targeted analytes were present or not, thus enabling multiplex sensing and evaluation of pollution status. This proof of concept study might provide a new route for the enhanced sensing performance to distinguish different pollution status as well as the design of molecular mimics of logic elements to demonstrate better applicability.
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Affiliation(s)
- Jun Yang
- Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, People's Republic of China
| | - Yali Zhang
- Shenzhen Second People's Hospital, Shenzhen 518035, People's Republic of China
- Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen 518107, People's Republic of China
| | - Junkai Zhao
- Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen 518107, People's Republic of China
| | - Junping Ma
- Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen 518107, People's Republic of China
| | - Changqing Yi
- Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, School of Biomedical Engineering, Sun Yat-Sen University, Shenzhen 518107, People's Republic of China
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Sun R, Guo X, Yang D, Tang Y, Lu J, Sun H. c-Myc G-quadruplex is sensitively and specifically recognized by a fluorescent probe. Talanta 2021; 226:122125. [PMID: 33676679 DOI: 10.1016/j.talanta.2021.122125] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/12/2021] [Accepted: 01/15/2021] [Indexed: 10/22/2022]
Abstract
The G-quadruplex structure formed by the c-myc gene sequence has attracted much attention due to its important physiological function in biology and wide application in nanotechnology. So far, probes capable of recognition of c-myc G-quadruplex with both high specificity and sensitivity are still scarce. This work presented a cyanine dye fluorescent probe named Cy-1, which has almost no fluorescence in aqueous solution, but showing more than 1000-fold fluorescence enhancement for recognizing c-myc G-quadruplex. Cy-1 also has good specificity and can selectively recognize c-myc G-quadruplex from other a variety of G-quadruplex and non-G-quadruplex structures. These properties make Cy-1 a promising probe for c-myc G-quadruplex recognition in nanotechnology or biology.
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Affiliation(s)
- Ranran Sun
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, PR China; Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, PR China
| | - Xiaomeng Guo
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Dawei Yang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Yalin Tang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jie Lu
- School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, PR China.
| | - Hongxia Sun
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, PR China.
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New turn on fluorimetric sensor for direct detection of ultra-trace ferric ions in industrial wastewater and its application by test strips. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113218] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Highly-sensitive and fast detection of human telomeric G-Quadruplex DNA based on a hemin-conjugated fluorescent metal-organic framework platform. Biosens Bioelectron 2021; 178:112999. [PMID: 33493897 DOI: 10.1016/j.bios.2021.112999] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 01/06/2021] [Accepted: 01/10/2021] [Indexed: 02/02/2023]
Abstract
The formation of G-quadruplex (G4) structures in Human telomeric DNA (H-Telo) has been demonstrated to inhibit the activity of telomerase enzyme that is associated with the proliferation of many cancer cells. Accordingly, G-quadruplex structures have become one of the well-established targets in anticancer therapeutic strategies. And, the development of simple and selective detection platforms for G4 structures has become a significant focus of research in recent years. In this study, a simple "off-on" fluorometric method was developed for the selective detection of picomolar quantities of H-Telo G4 DNA based on a fluorescent cerium-based metal organic framework (Ce-MOF) conjugated with hemin to form the sensing probe, Hemin@Ce-MOF. The solvothermal synthesis of the Ce-MOF took advantage of 5-aminoisophtlalic acid (5AIPA) as the organic bridging ligand, (Ce2(5AIPA)3(DMF)2). Characterization of Ce-MOF and Hemin@Ce-MOF was performed by XRD, XPS, TEM, SEM, BET and FTIR techniques. The detection and quantification of the H-Telo was carried out through the adsorption/incorporation of hemin molecules on the pores and surface of Ce-MOF resulting in the fluorescent quenching of the system followed by the restoration of the fluorescence upon addition of H-Telo probably due to a competition between H-Telo and Ce-MOF to bind to hemin. The impact of the key variables including MOF quantity, hemin concentration and detection time was investigated and optimized. Under the optimized conditions, the developed probe provides a limit of detection (LOD) of 665 pM, linear dynamic range (LDR) of 1.6-39.7 nM and excellent selectivity towards H-Telo. Taken together, these results present a simple, novel and superior platform for the selective detection of H-Telo G4 DNA.
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Doğan K, Gülkaya A, Forough M, Persil Çetinkol Ö. Novel Fluorescent Azacyanine Compounds: Improved Synthesis and Optical Properties. ACS OMEGA 2020; 5:22874-22882. [PMID: 32954136 PMCID: PMC7495752 DOI: 10.1021/acsomega.0c02202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 08/10/2020] [Indexed: 06/11/2023]
Abstract
Benzothiazoles are known to possess a number of biological activities and therefore are considered to be an important scaffold in the design and synthesis of pharmacophores. In this study, an improved synthesis method for novel fluorescent benzothiazole-based cyclic azacyanine (CAC) dyes bearing different electron-donating/withdrawing groups on their scaffold is presented. The improved method enabled us to increase the synthesis yield for the previously reported CACs. More importantly, it allowed us to synthesize new CAC dyes that were not synthesizable with the previously reported method. The synthesized dyes were characterized by 1H and 13C NMR spectroscopy, elemental analysis, and mass spectrometry and their optical (absorption and fluorescence) properties were investigated. All of the synthesized CACs were found to be displaying strong absorption within the range of 387-407 nm. The spectral shifts observed in the absorption and fluorescence measurements suggested that the spectroscopic and optical properties of CACs can be directly modulated by the nature of the electron-donating/withdrawing substituents. The fluorescence quantum yields (QYs) of the unsubstituted (parent CAC) and substituted CACs were also measured and compared. The fluorescence QY of CACs with electron-donating substituents (methoxy or ethoxy) was found to be at least four times higher than that of the parent CAC with no substitutions.
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