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Song H, Lim HJ, Son A. Development of an aptasensor for dibutyl phthalate detection and the elucidation of assay inhibition factors. RSC Adv 2024; 14:20585-20594. [PMID: 38946763 PMCID: PMC11211734 DOI: 10.1039/d4ra03045a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Accepted: 06/17/2024] [Indexed: 07/02/2024] Open
Abstract
We developed a fluorescence aptasensor (hereafter 'SG-aptasensor') using SYBR Green I, a newly truncated 20-mer aptamer, and probe DNA to detect dibutyl phthalate (DBP). The detection range of DBP was 0.1-100 ng L-1 with 0.08 ng L-1 as the limit of detection. To adapt the assay to environmental samples in the near future, possible inhibition factors (experimental and environmental) have been tested and reported. The experimental inhibitors included the incubation time, temperature, pH, and ionic strength. Consequently, temperature (2-25 °C) and pH (7.0-9.0) ranges did not significantly inhibit the assay. The incubation time required for sufficient reaction was at least 4 h, and a relative humidity <20% may have induced fluorescence quenching. Tris-HCl-based incubation buffer with excess ionic strength (more than 0.2 M NaCl) demonstrated an abnormal increase in fluorescence. Environmental inhibitors including cations (Mg2+, Ca2+, and Cu2+) and humic acids were tested. The fluorescence signal was significantly reduced (∼99%) by 100 mM Cu2+ compared to that by 0 mM Cu2+. In contrast, the reduction in fluorescence signal was marginal (<15%) when Mg2+ or Ca2+ ions were present. Inhibition of the assay was observed (∼28%) in the presence of 100 mg L-1 humic acids.
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Affiliation(s)
- Hyerin Song
- Department of Environmental Science and Engineering, Ewha Womans University 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea +82(2)3277-3339
- Center of SEBIS (Strategic Solutions for Environmental Blindspots in the Interests of Society) 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea
| | - Hyun Jeong Lim
- Department of Environmental Science and Engineering, Ewha Womans University 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea +82(2)3277-3339
- Center of SEBIS (Strategic Solutions for Environmental Blindspots in the Interests of Society) 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea
| | - Ahjeong Son
- Department of Environmental Science and Engineering, Ewha Womans University 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea +82(2)3277-3339
- Center of SEBIS (Strategic Solutions for Environmental Blindspots in the Interests of Society) 52 Ewhayeodae-gil, Seodaemun-gu Seoul 03760 Republic of Korea
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2
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Yang G, Li W, Zhang S, Hu B, Huang Z. Highly-efficient selection of aptamers for detecting various HPV subtypes in clinical samples. Talanta 2024; 266:125039. [PMID: 37604070 DOI: 10.1016/j.talanta.2023.125039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/31/2023] [Accepted: 08/04/2023] [Indexed: 08/23/2023]
Abstract
Nucleic acid aptamers are of great potentials in diagnostic and therapeutic applications because of their unique molecular recognition capabilities. However, satisfactory aptamers with high affinity and specificity are still in short supply. Herein, we have developed new selection methods allowing the free interactions between the targets and potential aptamers in solution. In our selection system, the protein targets (biotinylated randomly or site-specifically) were first incubated with the random DNA library, followed by the pull-down with the streptavidin magnetic beads or biolayer-interferometry (BLI) sensors. By comparing the two biotinylation strategies (random or site-specific) and two states of the targets (free or immobilized), we have found that the combination of the site-specific biotinylation and free-target strategies was most successful. Based on these highly-efficient selection strategies, HPV L1 aptamers were obtained. By designing the sandwich aptasensor assisted with RCA and CRISPR/Cas12a, we have diagnosed various HPV subtypes in clinical samples, such as easily-collected urine samples. In summary, our new strategy can allow efficient selection of aptamers with high affinity and specificity for clinical applications.
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Affiliation(s)
- Guotai Yang
- Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Wei Li
- Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Shun Zhang
- Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Bei Hu
- Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Zhen Huang
- Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, 610064, PR China; State Key Laboratory of Southwestern Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan, 610000, PR China; SeNA Research Institute and Szostak-CDHT Large Nucleic Acids Institute, Chengdu, Sichuan, 610095, PR China.
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Labra-Vázquez P, Gressier M, Rioland G, Menu MJ. A review on solution- and vapor-responsive sensors for the detection of phthalates. Anal Chim Acta 2023; 1282:341828. [PMID: 37923401 DOI: 10.1016/j.aca.2023.341828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 09/13/2023] [Accepted: 09/15/2023] [Indexed: 11/07/2023]
Abstract
Phthalic acid esters, largely referred to as phthalates, are today acknowledged as important pollutants used in the manufacture of polyvinyl chloride (PVC)-based plastics, whose use extends to almost every aspect of modern life. The risk of exposure to phthalates is particularly relevant as high concentrations are regularly found in drinking water, food-contact materials and medical devices, motivating an immense body of research devoted to methods for their detection in liquid samples. Conversely, phthalate vapors have only recently been acknowledged as potentially important atmospheric pollutants and as early fire indicators; additionally, deposition of these vapors can pose significant problems to the proper functioning of spacecraft and diverse on-board devices, leading to major space agencies recognizing the need of developing vapor-responsive phthalate sensors. In this manuscript we present a literature survey on solution- and vapor-responsive sensors and analytical assays for the detection of phthalates, providing a detailed analysis of a vast array of analytical data to offer a clear idea on the analytical performance (limits of detection and quantification, linear range) and advantages provided by each class of sensor covered in this review (electrochemical, optical and vapor-responsive) in the context of their potential real-life applications; the manuscript also gives detailed fundamental information on the various physicochemical responses exploited by these sensors and assays that could potentially be harnessed by new researchers entering the field.
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Affiliation(s)
- Pablo Labra-Vázquez
- CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 - Paul Sabatier, 118 Route de Narbonne, 31062, Toulouse, Cedex 9, France.
| | - Marie Gressier
- CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 - Paul Sabatier, 118 Route de Narbonne, 31062, Toulouse, Cedex 9, France
| | - Guillaume Rioland
- Centre National d'Etudes Spatiales, DTN/QE/LE, 31401, Toulouse, France
| | - Marie-Joëlle Menu
- CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 - Paul Sabatier, 118 Route de Narbonne, 31062, Toulouse, Cedex 9, France.
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4
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Liao D, Zhi J, Wang Q, Yan W, Guo Y, Han Y, Dong C, Xiao Y, Bai H, Liang W, Fan L. Efficient photoelectrochemical aptasensing of di-2-ethylhexyl phthalate in environmental samples based on N, S co-doped graphene quantum dots/TiO 2 nanorods. Anal Chim Acta 2023; 1271:341477. [PMID: 37328253 DOI: 10.1016/j.aca.2023.341477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 05/17/2023] [Accepted: 06/02/2023] [Indexed: 06/18/2023]
Abstract
An efficient photoelectrochemical (PEC) sensing platform was developed for detection of di-2-ethylhexyl phthalate (DEHP) based on nitrogen and sulfur co-doped graphene quantum dots/TiO2 nanorods (N, S-GQDs/TiO2 NRs) coupling with exonuclease I (Exo I)-assisted target recycling for remarkable signal amplification. N, S-GQDs uniformly grown on TiO2 NRs by simple hydrothermal method showed high electron-hole separation efficiency and superior photoelectric performance, which was explored as the photoactive substrate for anchoring anti-DEHP aptamer and its complementary DNA (cDNA). With the addition of DEHP, aptamer molecules fell from the electrode surface owing to the specific recognition of aptamer to DEHP, resulting in the increment of photocurrent signal. At this moment, Exo I could stimulate aptamer hydrolysis in the aptamer-DEHP complexes, so that DEHP was released from the complexes to take part in the next reaction cycling, which remarkably increasing the photocurrent response and achieving signal amplification. The designed PEC sensing platform exhibited excellent analytical performance for DEHP with a low detection limit of 0.1 pg L-1. Also, its applications in real samples were further investigated in detail. Thus, the established method would provide a simple and efficient tool for DEHP or other pollutants monitoring in the environment.
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Affiliation(s)
- Dongyun Liao
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China
| | - Jinfeng Zhi
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China
| | - Qiang Wang
- National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal, Institute of Coal Chemistry, CAS, Taiyuan, 030001, PR China
| | - Wenjun Yan
- National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal, Institute of Coal Chemistry, CAS, Taiyuan, 030001, PR China
| | - Yujing Guo
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China
| | - Yujie Han
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China
| | - Chuan Dong
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China
| | - Yong Xiao
- National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal, Institute of Coal Chemistry, CAS, Taiyuan, 030001, PR China
| | - Hongcun Bai
- State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, Ningxia, China
| | - Wenting Liang
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China.
| | - Lifang Fan
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi, 030006, PR China.
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Yang J, Zeng H, Chai Y, Yuan R, Liu H. Ultrasensitive photoelectrochemical biosensor amplified by target induced assembly of cruciform DNA nanostructure for the detection of dibutyl phthalate. Anal Chim Acta 2023; 1262:341242. [PMID: 37179065 DOI: 10.1016/j.aca.2023.341242] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/10/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023]
Abstract
In this work, an ultra-sensitive signal quenched photoelectrochemical (PEC) aptasensor for dibutyl phthalate (DBP) detection was constructed by using a target induced cruciform DNA structure as signal amplifier and g-C3N4/SnO2 composite as signal indicator. Impressively, the designed cruciform DNA structure shows high signal amplification efficiency due to the reduced reaction steric hindrance because of its mutually separated and repelled tails, multiple recognition domains, and a fixed direction for the sequential identification of the target. Therefore, the fabricated PEC biosensor demonstrated a low detection limit of 0.3 fM for DBP in a wide linear range of 1 fM to 1 nM. This work offered a novel nucleic acid signal amplification approach for enhancing the sensitivity of PEC sensing platforms for the detection of phthalates (PAEs)-based plasticizer, laying the foundation for its utilization in the determine of real environmental pollutants.
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Affiliation(s)
- Jie Yang
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Hongmei Zeng
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Yaqin Chai
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China
| | - Hongyan Liu
- Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
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6
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Zhang C, Zhou J, Ma T, Guo W, Wei D, Tan Y, Deng Y. Advances in application of sensors for determination of phthalate esters. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Competition-Induced Binding Spherical Nucleic AcidFluorescence Amplifier for the Detection of Di (2-ethylhexyl) Phthalate in the Aquatic Environment. NANOMATERIALS 2022; 12:nano12132196. [PMID: 35808031 PMCID: PMC9268500 DOI: 10.3390/nano12132196] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 02/01/2023]
Abstract
Di-2-ethylhexyl phthalate (DEHP) is a toxic plasticizer and androgen antagonist. Its accumulation in water exceeds national drinking water standards and it must be continuously and effectively regulated. Currently, methods used to detect DEHP are still unsatisfactory because they usually have limited detection sensitivity and require complex operating procedures. A competition-induced fluorescence detection method was developed for the selective detection of DEHP in an aquatic environment. An aptamer with walking function was used as the recognition element for DEHP, and its quantification was induced by competition to change the fluorescence signal. The detection range was 0.01~100 µg/L, and the detection limit was 1.008 μg/L. This high-sensitivity DEHP detection capability and simplified process facilitates real-time fields and other monitoring tasks.
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8
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Evanescent Wave Optical-Fiber Aptasensor for Rapid Detection of Zearalenone in Corn with Unprecedented Sensitivity. BIOSENSORS 2022; 12:bios12070438. [PMID: 35884240 PMCID: PMC9313073 DOI: 10.3390/bios12070438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 12/16/2022]
Abstract
Zearalenone (ZEN) is a common mycotoxin pollutant found in agricultural products. Aptamers are attractive recognition biomolecules for the development of mycotoxin biosensors. Even though numerous aptasensors have been reported for the detection of ZEN in recent years, many of them suffer from problems including low sensitivity, low specificity, tedious experimental steps, high-cost, and difficulty of automation. We report here the first evanescent wave optical-fiber aptasensor for the detection of ZEN with unprecedented sensitivity, high specificity, low cost, and easy of automation. In our aptasensor, a 40-nt ZEN-specific aptamer (8Z31) is covalently immobilized on the fiber. The 17-nt fluorophore Cy5.5-labeled complementary DNA strand and ZEN competitively bind with the aptamer immobilized on the fiber, enabling the signal-off fluorescent detection of ZEN. The coating of Tween 80 enhanced both the sensitivity and the reproducibility of the aptasensor. The sensor was able to detect ZEN spiked-in the corn flour extract with a semilog linear detection range of 10 pM-10 nM and a limit of detection (LOD, S/N = 3) of 18.4 ± 4.0 pM (equivalent to 29.3 ± 6.4 ng/kg). The LOD is more than 1000-fold lower than the maximum ZEN residue limits set by China (60 μg/kg) and EU (20 μg/kg). The sensor also has extremely high specificity and showed negligible cross-reactivity to other common mycotoxins. In addition, the sensor was able to be regenerated for 28 times, further decreasing its cost. Our sensor holds great potential for practical applications according to its multiple compelling features.
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Chen Q, Du M, Xu X. A label-free and selective electrochemical aptasensor for ultrasensitive detection of Di(2-ethylhexyl) phthalate based on self-assembled DNA nanostructure amplification. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Deng Y, Yan W, Guo Y, Wang Q, Bi Y, Dong C, Fan L. Highly sensitive and selective photoelectrochemical aptasensing of di-2-ethylhexyl phthalate based on graphene quantum dots decorated TiO 2 nanotube arrays. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:128107. [PMID: 34971987 DOI: 10.1016/j.jhazmat.2021.128107] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/29/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
A photoelectrochemical (PEC) sensing platform for di-2-ethylhexyl phthalate (DEHP) was constructed using graphene quantum dots decorated TiO2 nanotube arrays (GQDs-decorated TiO2 NTs) as the transducer species and the anti-DEHP aptamer as the biological recognition element. GQDs were synthesized using the alkali-mediated hydrothermal method, and then anchored onto the TiO2 NTs uniformly and intimately via pronounced electrostatic interaction. Coupling GQDs with TiO2 NTs not only enhanced visible-light absorption, but promoted charge separation and transportation, exhibiting excellent photocurrent response, and PEC activity. Various means were conducted to explore morphologies, optical, structural and PEC properties of the materials. As an identification unit, the anti-DEHP aptamer molecules were immobilized on GQDs-decorated TiO2 NTs using a cross-linking coupling method. The developed PEC sensing platform exhibits excellent sensing behavior for DEHP, and provides a low detection limit of 0.1 ng/L, high selectivity and stability. Meanwhile, its application in real environmental samples was evaluated and satisfying results were achieved. Thus, the established sensing platform provides a promising tool to detect DEHP in the environment.
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Affiliation(s)
- Yuan Deng
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China
| | - Wenjun Yan
- Analytical Instrumentation Center and State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, CAS, Taiyuan 030001, PR China
| | - Yujing Guo
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China
| | - Qiang Wang
- Analytical Instrumentation Center and State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, CAS, Taiyuan 030001, PR China
| | - Yingpu Bi
- State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, CAS, Lanzhou 730000, PR China
| | - Chuan Dong
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China.
| | - Lifang Fan
- Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China.
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Cheng H, Qin C, Yang B, Hu X, Gatheru Waigi M, Vasilyeva GK, Gao Y. Non-covalent binding interaction between phthalic acid esters and DNA. ENVIRONMENT INTERNATIONAL 2022; 161:107095. [PMID: 35063790 DOI: 10.1016/j.envint.2022.107095] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 01/04/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
The interaction of phthalic acid esters (PAEs) with DNA is known to be responsible for the disruption of endocrine functions and the teratogenic and carcinogenic effects. However, the binding strength and mechanism of this important process has often been neglected. Here, we confirmed the binding interaction between PAEs and DNA via fluorescence titration quenching experiment. The linear fitting curve proved that PAEs could bind to DNA, and the binding constants (KA) were 4.11 × 105, 1.04 × 105, 7.60 × 104, 1.99 × 104, and 1.42 × 103 L/mol for diethyl phthalate (DEP), bis(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), dimethyl phthalate (DMP), and benzyl butyl phthalate (BBP), respectively. DNA melting point, UV-vis spectra and Fourier transform infrared spectroscopy (FTIR) analyses revealed that PAEs interact predominantly with thymines in the DNA minor groove. Quantum chemical calculations showed that hydrogen bonding and van der Waals force formation between PAEs and DNA bases dominated the binding interaction. However, PAEs-DNA binding did not induce any DNA conformation change since the circular dichroism and FTIR spectra of B-DNA were not change. The electrostatic surface potential (ESP) might act an important role in PAEs-DNA binding interaction. This work will broaden our understanding of the interaction between PAEs and genetic materials.
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Affiliation(s)
- Hao Cheng
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Chao Qin
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China; Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, PR China
| | - Bing Yang
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Xiaojie Hu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Michael Gatheru Waigi
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Galina K Vasilyeva
- Institute of Physicochemical and Biological Problems in Soil Science, RAS, Pushchino, Moscow region 1422290, Russia
| | - Yanzheng Gao
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
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Lim HJ, Jin H, Chua B, Son A. Clustered Detection of Eleven Phthalic Acid Esters by Fluorescence of Graphene Quantum Dots Displaced from Gold Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2022; 14:4186-4196. [PMID: 35029109 DOI: 10.1021/acsami.1c21756] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A gold nanoparticle-quenched graphene quantum dot-based aptasensor was developed to perform clustered detection of 11 phthalic acid esters (PAEs). The binding of the target PAEs to the aptasensor frees the graphene quantum dots that are otherwise quenched by the carrier gold nanoparticle. The resultant fluorescence upon excitation is proportional to the number of freed graphene quantum dots and hence the target PAE concentration. The synthesis of the proposed aptasensor was first verified step-by-step via FT-IR measurement, scanning electron microscopy, and fluorescence measurement. Selectivity was evaluated for individual and combined target PAEs and compared against seven non-PAE endocrine disrupting compounds. The proposed aptasensor successfully quantified 11 PAEs in test samples with varying concentrations of 0.001-50 ng PAEs/mL and demonstrated a limit of detection of ∼4 pg./mL. Finally, the AuNP-gQD aptasensor was employed to detect multiple combinations of commonly regulated PAEs (DBP, DIBP, DEHP, and BBP). The recovery (%) for all four PAEs combination in environmentally relevant concentrations of 0.5, 1, 5, and 10 ng/mL were ∼100%.
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Affiliation(s)
- Hyun Jeong Lim
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, United States
- Department of Environmental Science and Engineering, Ewha Womans Universty, Seoul 03760, Republic of Korea
| | - Hyowon Jin
- Department of Environmental Science and Engineering, Ewha Womans Universty, Seoul 03760, Republic of Korea
| | - Beelee Chua
- School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Ahjeong Son
- Department of Environmental Science and Engineering, Ewha Womans Universty, Seoul 03760, Republic of Korea
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Shen YZ, Guan J, Ma C, Shu Y, Xu Q, Hu XY. Competitive Displacement Triggering DBP Photoelectrochemical Aptasensor via Cetyltrimethylammonium Bromide Bridging Aptamer and Perovskite. Anal Chem 2022; 94:1742-1751. [PMID: 35026109 DOI: 10.1021/acs.analchem.1c04348] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Here, a label-free perovskite-based photoelectrochemical (PEC) aptasensor was rationally designed for the displacement assay of dibutyl phthalate (DBP), a well-known endocrine disruptor, with the aid of cetyltrimethylammonium bromide (CTAB). In this method, CTAB significantly enhanced the PEC response and humidity resistance of the CH3NH3PbI3 perovskite by forming a protecting layer and passivating the X- and A-sites vacancies of CH3NH3PbI3. In addition, CTAB facilitated the immobilization of an aptamer through van der Waals and hydrophobicity forces, as well as the electrostatic interactions between the phosphate group of the aptamer and the cationic group of CTAB. When exposed to DBP in the affinity solution, the DBP aptamer was released from the electrode because the affinity between DBP and its aptamer competes with the interaction of the aptamer and CTAB. The displacement of the aptamer from the perovskite surface relieves the block effect and thus enhances the photoelectric signal of perovskite. By virtue of the good photoelectrochemical characters of CH3NH3PbI3 and the specific recognition ability of aptamer, the linear range of the PEC sensor was 1.0 × 10-13 to 1.0 × 10-8 M and the detection and quantification limits were down to 2.5 × 10-14 and 8.2 × 10-14 M (S/N = 3), respectively. This work offers a novel strategy for designing aptasensors for the detection of various targets and exhibits the marvelous potential of organic-inorganic perovskite in the field of PEC analysis.
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Affiliation(s)
- Ying-Zhuo Shen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Jie Guan
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chen Ma
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Yun Shu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Qin Xu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Xiao-Ya Hu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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Gurudatt NG, Lee K, Heo W, Jung HI. Simple ultrasensitive electrochemical detection of the DBP plasticizer for the risk assessment of South Korean river waters. Analyst 2022; 147:3525-3533. [DOI: 10.1039/d2an00809b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a simple electrochemical strategy for the ultrasensitive quantitative analysis of DBP plasticizer in water. The proposed aptasensor is comparable to GC-MS in sensitivity and it was applied to monitor the river waters contamination.
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Affiliation(s)
- N. G. Gurudatt
- School of Mechanical Engineering, Yonsei University, Seoul, South Korea
| | - Kyungyeon Lee
- School of Mechanical Engineering, Yonsei University, Seoul, South Korea
| | - Woong Heo
- School of Mechanical Engineering, Yonsei University, Seoul, South Korea
| | - Hyo-Il Jung
- School of Mechanical Engineering, Yonsei University, Seoul, South Korea
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15
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Chang T, He S, Amini R, Li Y. Functional Nucleic Acids Under Unusual Conditions. Chembiochem 2021; 22:2368-2383. [PMID: 33930229 DOI: 10.1002/cbic.202100087] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/24/2021] [Indexed: 02/06/2023]
Abstract
Functional nucleic acids (FNAs), including naturally occurring ribozymes and riboswitches as well as artificially created DNAzymes and aptamers, have been popular molecular toolboxes for diverse applications. Given the high chemical stability of nucleic acids and their ability to fold into diverse sequence-dependent structures, FNAs are suggested to be highly functional under unusual reaction conditions. This review will examine the progress of research on FNAs under conditions of low pH, high temperature, freezing conditions, and the inclusion of organic solvents and denaturants that are known to disrupt nucleic acid structures. The FNA species to be discussed include ribozymes, riboswitches, G-quadruplex-based peroxidase mimicking DNAzymes, RNA-cleaving DNAzymes, and aptamers. Research within this space has not only revealed the hidden talents of FNAs but has also laid important groundwork for pursuing these intriguing functional macromolecules for unique applications.
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Affiliation(s)
- Tianjun Chang
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, L8S 4K1, Canada
- Department of Biology, Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo, 454000, Henan, P. R. China
| | - Sisi He
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, L8S 4K1, Canada
- School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen, 518055, Guangdong, P. R. China
| | - Ryan Amini
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, L8S 4K1, Canada
| | - Yingfu Li
- Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, L8S 4K1, Canada
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16
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Wu Z, Pan Y, Wang Z, Ding P, Gao T, Li Q, Hu M, Zhu W, Pei R. A PLGA nanofiber microfluidic device for highly efficient isolation and release of different phenotypic circulating tumor cells based on dual aptamers. J Mater Chem B 2021; 9:2212-2220. [PMID: 33616137 DOI: 10.1039/d0tb02988b] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The isolation of specific and sensitive circulating tumor cells (CTCs) is significant for applying them in cancer diagnosis and monitoring. In this work, dual aptamer-modified poly(lactic-co-glycolic acid) (PLGA) nanofiber-based microfluidic devices were fabricated to achieve the highly efficient capture and specific release of epithelial and mesenchymal CTCs of ovarian cancer. Dual aptamer targeting epithelial cell adhesion molecules (EpCAM) and N-cadherin proteins to improve the capture sensitivity, bovine serum albumin (BSA) to guarantee the capture purity and the nanofibers to increase the capture efficiency via synchronously and effectively capturing the epithelial and mesenchymal CTCs with good capture specificity and sensitivity from blood samples were used. We used the target cells including the ovarian cancer A2780 cells (N-cadherin-high, EpCAM-low) and OVCAR-3 cells (EpCAM-high, N-cadherin-low) to test the devices, which exhibited good capture efficiency (91% for A2780 cells, 89% for OVCAR-3 cells), release efficiency (95% for A2780 cells, 88% for OVCAR-3 cells), and sensitivity for rare cells (92% for A2780 cells, 88% for OVCAR-3 cells). Finally, the clinical blood samples of ovarian cancer patients were detected by the PLGA nanofiber-based microfluidic device, and 1 to 13 CTCs were successfully confirmed to be captured with the help of immunofluorescence staining identification. The results exhibited that the dual aptamer-modified PLGA nanofiber-based microfluidic device used as a tool for CTC capture has the potential for clinical application to guide the diagnosis, treatment, and prognosis of ovarian cancer patients.
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Affiliation(s)
- Zeen Wu
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China. and CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Yue Pan
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China. and CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Zhili Wang
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Pi Ding
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Tian Gao
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Qing Li
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China.
| | - Mingchao Hu
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
| | - Weipei Zhu
- Department of Gynecology and Obstetrics, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China.
| | - Renjun Pei
- CAS Key Laboratory for Nano-Bio Interface, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China.
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17
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Development of a bimodal sensor based on upconversion nanoparticles and surface-enhanced Raman for the sensitive determination of dibutyl phthalate in food. J Food Compost Anal 2021. [DOI: 10.1016/j.jfca.2021.103929] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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18
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Chen Y, Wang Z, Liu S, Zhao G. A highly sensitive and group-targeting aptasensor for total phthalate determination in the environment. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:125174. [PMID: 33524734 DOI: 10.1016/j.jhazmat.2021.125174] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 01/16/2021] [Accepted: 01/17/2021] [Indexed: 06/12/2023]
Abstract
As the most widely used and typical kind of plasticizers, phthalate esters (PAEs) have become one of the most common environmental pollutants in the world. Therefore, it is necessary to develop a rapid and convenient method for determining the total amount of PAEs. Herein, a molecularly tailored broad-spectrum aptamer that can recognize multiple similarly structured total amounts of PAEs (TP) and bind them with high affinity has been successfully fabricated. Mfold (multiple folding) secondary structure simulation and molecular truncation were both utilized to obtain the most effective binding region from the parental full-length (39-mer) aptamer. The results show that the PAE-binding affinity of the truncated 24-mer aptamer produced by removing nonessential flanking nucleotides was improved by 1.5-fold. The linear range of TP detection is 0.003-10 μg/L, and the limit of detection is 1 ng/L. Notably, our study provides new insights into the group-targeting identification of certain pollutants and determination of their total amounts, exhibiting great potential for practical applications.
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Affiliation(s)
- Yuqing Chen
- Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration, Ministry of Education, Tongji Hospital, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
| | - Zhiming Wang
- Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration, Ministry of Education, Tongji Hospital, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
| | - Siyao Liu
- Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration, Ministry of Education, Tongji Hospital, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
| | - Guohua Zhao
- Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration, Ministry of Education, Tongji Hospital, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China.
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19
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Screening and application of a broad-spectrum aptamer for acyclic guanosine analogues. Anal Bioanal Chem 2021; 413:4855-4863. [PMID: 34110440 DOI: 10.1007/s00216-021-03446-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/16/2021] [Accepted: 05/31/2021] [Indexed: 10/21/2022]
Abstract
Acyclic guanosine analogues, a class of widely used antiviral drugs, can cause chronic toxicity and virus resistance. Therefore, it is essential to establish rapid and accurate methods to detect acyclic guanosine analogues. In this study, five acyclic guanosine analogues (acyclovir, famciclovir, ganciclovir, penciclovir, and valaciclovir) were used as positive targets to obtain broad-spectrum aptamers through Capture-SELEX technology. Real-time quantitative PCR (Q-PCR) was used to monitor the aptamer SELEX process. After the sixteen rounds of selection against mixed targets, sequences were obtained by high-throughput sequencing (HTS). Furthermore, a broad-spectrum aptamer, named CIV6, was found as the higher performance aptamer that was suitable for five acyclic guanosine analogues by graphene oxide (GO) polarization and fluorescence assay. Finally, the aptamer CIV6 was used to construct GO fluorescence assay to detect five acyclic guanosine analogues. The limits of detection (LOD) of acyclovir, famciclovir, ganciclovir, penciclovir, and valaciclovir were 0.48 ng·mL-1, 0.53 ng·mL-1, 0.50 ng·mL-1, 0.56 ng·mL-1, and 0.38 ng·mL-1, respectively.
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20
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Li J, Ren X, Zhao J, Lou X. PD-L1 aptamer isolation via Modular-SELEX and its applications in cancer cell detection and tumor tissue section imaging. Analyst 2021; 146:2910-2918. [PMID: 33724284 DOI: 10.1039/d1an00182e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PD-1/PD-L1 is an important pathway in immunotherapy and a high PD-L1 expression level in tumor tissues is an essential prerequisite for PD-1/PD-L1 blocking-based therapy. The PD-L1 expression level in tumor tissue sections is currently detected via immunohistochemistry (IHC) using anti-PD-L1 antibodies from various resources, which has the disadvantage of inconsistent results. As synthetic affinity ligands, aptamers have good batch-to-batch consistency and have been demonstrated to have great potential for use in biomedical applications. In this study, we isolated PD-L1 aptamers using a combination method, named Modular-SELEX (systematic evolution of ligands by exponential enrichment), which includes three sequentially performed modules: the affinity module, the specificity module, and the compatibility module. Three rounds of magnetic crosslinking precipitation (MCP)-SELEX, three rounds of Capture-SELEX, and two rounds of Tissue-SELEX were respectively performed in the corresponding three modules to significantly and efficiently improve the native affinity, specificity, and compatibility of the enriched library. The isolated aptamer Clon-3 had nanomolar binding affinity, as determined via both homogeneous and PD-L1 immobilized affinity assays. Clon-3 could be used to recognize various cancer cells with distinct PD-L1 expression levels using flow cytometry. The PD-L1 expression levels in normal human tonsils (the gold standard for anti-PD-L1 antibody) and non-small cell lung cancer tissue sections stained using Cy5.5-labeled Clon-3 were also successfully imaged using a confocal microscope. The fluorescence intensities of the tissue sections were in good agreement with their actual PD-L1 expression levels as confirmed via IHC.
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Affiliation(s)
- Jiyuan Li
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China.
| | - Xijiao Ren
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China.
| | - Jiaxing Zhao
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China.
| | - Xinhui Lou
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China.
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21
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Zhao J, Lu Z, Wang S, Wei Z, Zhou J, Ren S, Lou X. Nanoscale Affinity Double Layer Overcomes the Poor Antimatrix Interference Capability of Aptamers. Anal Chem 2021; 93:4317-4325. [PMID: 33620193 DOI: 10.1021/acs.analchem.0c05320] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Poor antimatrix interference capability of aptamers is one of the major obstacles preventing their wide applications for real-sample detections. Here, we devise a multiple-function interface, denoted as a nanoscale affinity double layer (NADL), to overcome this bottleneck via in situ simultaneous target enrichment, purification, and detection. The NADL consists of an upper aptamer layer for target purification and sensing and a lower nanoscale solid-phase microextraction (SPME) layer for sample enrichment. The targets flowing through the NADL-functionalized surface are instantly million-fold enriched and purified by the sequential extraction of aptamer and SPME. The formation of the aptamer-target complex is greatly enhanced, enabling ultrasensitive detection of targets with minimized interference from the matrix. Taking the fiber-optic evanescent wave sensor as an example, we demonstrated the feasibility and generality of the NADL. The unprecedented detection of limits of 800, 4.8, 40, and 0.14 fM were, respectively, achieved for three representative small-molecule targets with distinct hydrophobicity (kanamycin A, sulfadimethoxine, and di-(2-ethylhexyl) phthalate) and protein target (human serum albumin), corresponding to 2500 to 3 × 108-fold improvement compared to the sensors without the NADL. Our sensors also showed exceptionally high target specificity (>1000) and tunable dynamic ranges simply by manipulating the SPME layer. With these features comes the ability to directly detect targets in diluted environmental, food, and biological samples at concentrations all well below the tolerance limits.
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Affiliation(s)
- Jiaxing Zhao
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Zhangwei Lu
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Shuo Wang
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Zhenzhe Wei
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Jianshuo Zhou
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Shang Ren
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xinhui Lou
- Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
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22
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Yu H, Luo Y, Alkhamis O, Canoura J, Yu B, Xiao Y. Isolation of Natural DNA Aptamers for Challenging Small-Molecule Targets, Cannabinoids. Anal Chem 2021; 93:3172-3180. [PMID: 33528997 DOI: 10.1021/acs.analchem.0c04592] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Aptamers are nucleic acid-based affinity reagents that are isolated via an in vitro process known as systematic evolution of ligands by exponential enrichment (SELEX). Despite their great potential for a wide range of analytical applications, there are relatively few high-quality small-molecule binding aptamers, especially for "challenging" targets that have low water solubility and/or limited moieties for aptamer recognition. The use of libraries containing chemically modified bases may improve the outcome of some SELEX experiments, but this approach is costly and yields inconsistent results. Here, we demonstrate that a thoughtfully designed SELEX procedure with natural DNA libraries can isolate aptamers with high affinity and specificity for challenging small molecules, including targets for which such selections have previously failed. We first isolate a DNA aptamer with nanomolar affinity and high specificity for (-)-trans-Δ9-tetrahydrocannabinol (THC), a target previously thought to be unsuitable for SELEX with natural DNA libraries. We subsequently isolate aptamers that exhibit high affinity and cross-reactivity to two other challenging targets, synthetic cannabinoids UR-144 and XLR-11, while maintaining excellent specificity against a wide range of non-target interferents. Our findings demonstrate that natural nucleic acid libraries can yield high-quality aptamers for small-molecule targets, and we outline a robust workflow for isolating other such aptamers in future selection efforts.
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Affiliation(s)
- Haixiang Yu
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida, 33199, United States
| | - Yingping Luo
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida, 33199, United States.,State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of TCM Evaluation and Translational Research, Department of Complex Prescription of TCM, China Pharmaceutical University, Nanjing 211198, P. R. China
| | - Obtin Alkhamis
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida, 33199, United States
| | - Juan Canoura
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida, 33199, United States
| | - Boyang Yu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of TCM Evaluation and Translational Research, Department of Complex Prescription of TCM, China Pharmaceutical University, Nanjing 211198, P. R. China
| | - Yi Xiao
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida, 33199, United States
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23
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Chu Q, Liu Y, Jiang S, Zhu Y, Lyu H, Xie Z. A novel adsorbent based on aptamer prepared via “thiol-ene” click for specific recognition of phthalic acid esters. Anal Chim Acta 2021; 1146:109-117. [DOI: 10.1016/j.aca.2020.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/15/2020] [Accepted: 12/18/2020] [Indexed: 11/25/2022]
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24
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Cho SW, Lim HJ, Chua B, Son A. Single-stranded DNA probe paired aptasensor with extra dye binding sites to enhance its fluorescence response in the presence of a target compound. RSC Adv 2021; 11:21796-21804. [PMID: 35478796 PMCID: PMC9034146 DOI: 10.1039/d1ra00971k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 06/06/2021] [Indexed: 11/29/2022] Open
Abstract
The purpose of this study is to investigate the possibility of improving the performance of a DNA binding dye water quenching based aptasensor without changing or truncating the aptamer. To demonstrate the possibility of increasing the change in fluorescence of the aptasensor by pairing it with a suitable ssDNA probe, three ssDNA probes (probe 1, 2, and 3) were employed and the fluorescence from the bound dyes was measured. This showed that ssDNA probe 2 created the most additional binding sites. By varying the target compound concentration (0, 0.05, 0.5, 5, 50, and 500 mg L−1 4-n-nonylphenol), the corresponding change in the fluorescence signal of the unpaired and ssDNA probe paired aptasensors were measured and compared over a range of emission wavelengths. The response of all three ssDNA probe paired aptasensors showed good fit (R2 = 0.88–0.92) to a logarithmic response. The sensitivity of the aptasensor paired with ssDNA probe 2 was improved by ∼60%, whereas that of the aptasensor paired with ssDNA probe 3 was only improved by a marginal ∼3%. This study is a demonstration of using an appropriate ssDNA probe to increase the number of binding sites and hence the performance of a DNA binding dye and water quenched aptasensor. It is a possibility that can be extended to similar aptasensors without having to change or truncate the aptamer. Principle of an ssDNA paired aptasensor where extra dye binding sites are created to enhance its fluorescence response.![]()
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Affiliation(s)
- Seo Won Cho
- Department of Environmental Science and Engineering
- Ewha Womans University
- Seoul 03760
- Republic of Korea
- Department of Civil and Environmental Engineering
| | - Hyun Jeong Lim
- Department of Environmental Science and Engineering
- Ewha Womans University
- Seoul 03760
- Republic of Korea
| | - Beelee Chua
- School of Electrical Engineering
- Korea University
- Seoul 02841
- Republic of Korea
| | - Ahjeong Son
- Department of Environmental Science and Engineering
- Ewha Womans University
- Seoul 03760
- Republic of Korea
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25
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Gao T, Ding P, Li W, Wang Z, Lin Q, Pei R. Isolation of DNA aptamers targeting N-cadherin and high-efficiency capture of circulating tumor cells by using dual aptamers. NANOSCALE 2020; 12:22574-22585. [PMID: 33174555 DOI: 10.1039/d0nr06180h] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Circulating tumor cells (CTCs) acquire mesenchymal markers (e.g., N-cadherin) and lose epithelial markers (e.g., epithelial cell adhesion molecule, EpCAM) during the epithelial-mesenchymal transition (EMT) and are therefore ideal biomarkers of tumor metastasis. However, it is still a challenge to efficiently capture and detect circulating tumor cells with different phenotypes simultaneously. In this work, to obtain aptamers targeting N-cadherin in the native conformation on live cells, we established stable N-cadherin overexpressing cells (N-cadherin cells) and used these cells to identify a panel of N-cadherin-specific aptamers through the cell-SELEX approach. Two aptamer candidates obtained after 12 rounds of selection showed a low equilibrium dissociation constant in the nanomolar range, indicating high binding affinity. The truncated aptamer candidate NC3S showed the highest binding affinity to N-cadherin cells with a low Kd value of 20.08 nM. The SYL3C aptamer was reported to target cancer cell surface biomarker EpCAM. Then, we synthesized two kinds of aptamer-modified magnetic nanoparticles (SYL3C-MNPs and NC3S-MNPs). Both SYL3C and NC3S aptamers possess excellent capture specificity and efficiency for the target cells. The aptamer-MNP cocktail exhibits a considerable capture efficiency and sensitivity for rare cancer cells of epithelial and mesenchymal phenotypes. Furthermore, no CTCs were found in blood samples from healthy donors, while CTCs were successfully isolated by using the aptamer-MNP cocktail for 15 out of 16 samples collected from patients. In summary, the two kinds of aptamer-modified MNPs could be utilized as a promising tool for capturing CTCs from clinical samples.
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Affiliation(s)
- Tian Gao
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
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26
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Kim D, Lim HJ, Ahn YG, Chua B, Son A. Development of non-equilibrium rapid replacement aptamer assay for ultra-fast detection of phthalic acid esters. Talanta 2020; 219:121216. [PMID: 32887117 DOI: 10.1016/j.talanta.2020.121216] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 12/27/2022]
Abstract
In this paper, we developed a non-equilibrium rapid replacement aptamer (NERRA) assay that performed ultra-fast (in 30 s) quantitative detection of phthalic acid esters (PAEs) without waiting for the reaction to reach equilibrium. NERRA assay employed fluorescence PoPo3 dye intercalated in an ssDNA aptamer to selectively detect and quantify the PAEs in water. As the intercalated dye was replaced by the PAEs and quenched in the water, the rate of fluorescence change became proportional to PAEs concentration. The sensitivity of NERRA assay was first evaluated with a commercial spectrofluorometer. The selectivity for PAE mixture, individual PAEs, and non-phthalate compounds were also investigated. NERRA assay was also able to quantitatively detect the PAEs in a common plastic product (picnic mat), and the results were compared with those of gas chromatography mass spectrometry. Finally, a custom analyzer (8.5 cm × 8.5 cm × 16.5 cm) was built to demonstrate the portability of the NERRA assay. Using a commercial spectrofluorometer, NERRA assay was able to quantitatively detect a PAE mixture in 30 min with an LOQ of 0.1 μg/L. Using the portable custom analyzer, the detection time was shortened to 30 s with a tradeoff in the LOQ (1 μg/L). In both cases, the LOQs remain within the environmentally relevant PAE concentrations of 0.1-1472 μg/L.
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Affiliation(s)
- Dabin Kim
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Hyun Jeong Lim
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul, 03760, Republic of Korea
| | - Yun Gyong Ahn
- Western Seoul Center, Korea Basic Science Institute, Seoul, 03760, Republic of Korea
| | - Beelee Chua
- School of Electrical Engineering, Korea University, Seoul, 02841, Republic of Korea.
| | - Ahjeong Son
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul, 03760, Republic of Korea.
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27
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Santos AM, Wong A, Prado TM, Fava EL, Fatibello-Filho O, Sotomayor MDPT, Moraes FC. Voltammetric determination of ethinylestradiol using screen-printed electrode modified with functionalized graphene, graphene quantum dots and magnetic nanoparticles coated with molecularly imprinted polymers. Talanta 2020; 224:121804. [PMID: 33379030 DOI: 10.1016/j.talanta.2020.121804] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 01/23/2023]
Abstract
The present work reports the development of a sensitive and selective method for ethinylestradiol detection using screen-printed electrode (SPE) modified with functionalized graphene (FG), graphene quantum dots (GQDs) and magnetic nanoparticles coated with molecularly imprinted polymers (mag@MIP). The performance of the mag@MIP sensor was compared with that of a non-molecularly imprinted sensor (mag@NIP). Chemical and physical characterizations of the mag@NIP and mag@MIP sensors were performed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Brunauer-Emmett-Teller (BET) techniques. The electrochemical behavior of the electrodes investigated, which included (mag@MIP)-GQDs-FG-NF/SPE, (mag@NIP)-GQDs-FG-NF/SPE, GQDs-FG-NF/SPE and FG-NF/SPE, was evaluated by cyclic voltammetry. The results obtained show a significant increase in peak current magnitude for (mag@MIP)-GQDs-FG-NF/SPE. Using square wave voltammetry experiments, the efficiency of the (mag@MIP)-GQDs-FG-NF/SPE sensor was also tested under optimized conditions. The linear response range obtained for ethinylestradiol concentration was 10 nmol L-1 to 2.5 μmol L-1, with limit of detection of 2.6 nmol L-1. The analytical signal of the (mag@MIP)-GQDs-FG-NF/SPE sensor suffered no interference from different compounds and the sensor exhibited good repeatability. The proposed sensor was successfully applied for ethynilestradiol detection in river water, serum and urine samples, where recovery rates between 96 to 105% and 97-104% were obtained for environmental and biological samples, respectively.
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Affiliation(s)
- Anderson M Santos
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil
| | - Ademar Wong
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil; Department of Analytical Chemistry, Institute of Chemistry, State University of São Paulo and INCT-DATREM, 14801-970, Araraquara, SP, Brazil
| | - Thiago M Prado
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil
| | - Elson L Fava
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil
| | - Orlando Fatibello-Filho
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil
| | - Maria D P T Sotomayor
- Department of Analytical Chemistry, Institute of Chemistry, State University of São Paulo and INCT-DATREM, 14801-970, Araraquara, SP, Brazil
| | - Fernando C Moraes
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luís km 235, P. O. Box 676, 13560-970, São Carlos, SP, Brazil.
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Rapid Multi-Residue Detection Methods for Pesticides and Veterinary Drugs. Molecules 2020; 25:molecules25163590. [PMID: 32784605 PMCID: PMC7464912 DOI: 10.3390/molecules25163590] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/29/2020] [Accepted: 08/05/2020] [Indexed: 01/11/2023] Open
Abstract
The excessive use or abuse of pesticides and veterinary drugs leads to residues in food, which can threaten human health. Therefore, there is an extremely urgent need for multi-analyte analysis techniques for the detection of pesticide and veterinary drug residues, which can be applied as screening techniques for food safety monitoring and detection. Recent developments related to rapid multi-residue detection methods for pesticide and veterinary drug residues are reviewed herein. Methods based on different recognition elements or the inherent characteristics of pesticides and veterinary drugs are described in detail. The preparation and application of three broadly specific recognition elements-antibodies, aptamers, and molecular imprinted polymers-are summarized. Furthermore, enzymatic inhibition-based sensors, near-infrared spectroscopy, and SERS spectroscopy based on the inherent characteristics are also discussed. The aim of this review is to provide a useful reference for the further development of rapid multi-analyte analysis of pesticide and veterinary drug residues.
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29
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Synthesis, characterization, antioxidant evaluation, molecular docking and density functional theory studies of phenyl and naphthyl based esters. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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30
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New trends in the electrochemical detection of endocrine disruptors in complex media. Anal Bioanal Chem 2020; 412:5913-5923. [PMID: 32172326 DOI: 10.1007/s00216-020-02516-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/03/2020] [Accepted: 02/12/2020] [Indexed: 12/24/2022]
Abstract
Endocrine disruptors (EDCs) are substances existing in the environment which affect animal and human endocrine functions and cause diseases. A small quantity of EDCs can have a serious impact on the body. Currently, enzyme-linked immunosorbent assay (ELISA), high-performance liquid chromatography (HPLC), and other traditional methods are used to detect EDCs. Although their sensitivity and reliability are good, these methods are complex, expensive, and not feasible to use in the field. Electrochemical techniques present good potential for the detection of EDCs owing to their low cost, simple, and wearable instrumentation. This paper presents the new trends in this field over the last 3 years. Some simple materials can allow some EDCs to be directly detected. New designs of biosensors, such as aptasensors, allow a femtomolar limit of detection to be reached. Many types of nanomaterial-based sensors were tested; carbonaceous nanomaterials, such as multiwalled carbon nanotubes (MWCNTs) and reduced graphene oxide (rGO), associated or not with other types of nanoparticles were included in numerous designs. Molecularly imprinted polymer (MIP)-based sensors constitute an emerging field. All the presented electrochemical sensors were successfully tested for the detection of EDCs in different types of real samples.
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31
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Affiliation(s)
- Lei Li
- The Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo/Biosensing, Laboratory of Biosensing and Bioimaging, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, People’s Republic of China
| | - Mingcui Zhang
- The Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo/Biosensing, Laboratory of Biosensing and Bioimaging, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, People’s Republic of China
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32
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Lu Q, Liu X, Hou J, Yuan Q, Li Y, Chen S. Selection of Aptamers Specific for DEHP Based on ssDNA Library Immobilized SELEX and Development of Electrochemical Impedance Spectroscopy Aptasensor. Molecules 2020; 25:molecules25030747. [PMID: 32050451 PMCID: PMC7038136 DOI: 10.3390/molecules25030747] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/23/2020] [Accepted: 01/25/2020] [Indexed: 12/20/2022] Open
Abstract
A selection of aptamers specific for di(2-ethylhexyl) phthalate (DEHP) and development of electrochemical impedance spectroscopy (EIS) aptasensor are described in this paper. The aptamers were selected from an immobilized ssDNA library using the systematic evolution of ligands by exponential enrichment (SELEX). The enrichment was monitored using real-time quantitative PCR (Q-PCR), and the aptamers were identified by high-throughput sequencing (HTS), gold nanoparticles (AuNPs) colorimetric assay, and localized surface plasmon resonance (LSPR). The EIS aptasensor was developed to detect DEHP in water samples. After eight rounds of enrichment, HTS, AuNPs colorimetric assay, and LSPR analysis indicated that four aptamers had higher binding activity, and aptamer 31 had the highest affinity (Kd = 2.26 ± 0.06 nM). The EIS aptasensor had a limit of detection (LOD) of 0.103 pg/mL with no cross-reactivity to DEHP analogs and a mean recovery of 76.07% to 141.32% for detection of DEHP in water samples. This aptamer is novel with the highest affinity and sensitivity.
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Affiliation(s)
- Qi Lu
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
| | - Xixia Liu
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
- Hubei Engineering Research Center of typical wild vegetable Breeding and Comprehensive Utilization Technology; Hubei Normal University, Huangshi 435002, China
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
- Correspondence: (X.L.); (J.H.)
| | - Jianjun Hou
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
- Hubei Engineering Research Center of typical wild vegetable Breeding and Comprehensive Utilization Technology; Hubei Normal University, Huangshi 435002, China
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
- Correspondence: (X.L.); (J.H.)
| | - Qiuxue Yuan
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
| | - Yani Li
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
| | - Sirui Chen
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
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33
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Qiao N, Li J, Wu X, Diao D, Zhao J, Li J, Ren X, Ding X, Shangguan D, Lou X. Speeding up in Vitro Discovery of Structure-Switching Aptamers via Magnetic Cross-Linking Precipitation. Anal Chem 2019; 91:13383-13389. [PMID: 31580650 DOI: 10.1021/acs.analchem.9b00081] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We report here a modified aptamer selection method, magnetic cross-linking precipitation (MCP)-SELEX, for highly efficient library enrichment and aptamer isolation. MCP-SELEX isolates bound aptamers via highly efficient chemical cross-linking between amino groups of target proteins and activated carboxylic acid groups on magnetic beads (>90% coupling efficiency). Importantly, MCP-SELEX avoids surface interferences in conventional target-fixed methods and substantially minimizes nonspecific binding. The enrichment efficiencies of MCP-SELEX for various proteins (PD-L1, ubiquitin, thrombin, and HSA) were all greatly higher than those of the conventional target-bound magnetic bead based-SELEX (MB-SELEX). Antithrombin aptamer with KD of 33 nM was successfully isolated by four rounds of MCP-SELEX. MCP-SELEX also enabled the efficient aptamer isolation by coupling with MB-SELEX or falling-off-SELEX. We identified structure-switching aptamers (SSAs) that specifically bind to HSA with low nanomolar dissociation constant via three rounds of MCP-SELEX and 1 round of falling-off-SELEX. Our HSA SSAs also have ∼3-fold higher specificity against streptavidin relative to thrombin SSAs discovered through falling-off-SELEX only. The enriched library has ∼78-fold higher signal-to-noise ratio (the number of DNAs eluted by 50 nM HSA divided by the number of DNAs self-dissociated in blank buffer) than that obtained by 4 rounds of direct falling-off-SELEX. We finally demonstrated the application of the selected SSA in fluorescent detection of HSA in urine with diagnostic required sensitivity and dynamic range. We expect that MCP-SELEX may be coupled with other selection methods to substantially accelerate aptamer discovery.
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Affiliation(s)
- Na Qiao
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Jing Li
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Xiao Wu
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Donglin Diao
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Jiaxing Zhao
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Jiyuan Li
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Xijiao Ren
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Xiaofan Ding
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
| | - Dihua Shangguan
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems , Institute of Chemistry, Chinese Academy of Sciences , Beijing , 100190 , China
| | - Xinhui Lou
- Department of Chemistry , Capital Normal University , Xisanhuan North Road. 105 , Beijing 100048 , China
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34
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Yang J, Song W, Wang X, Li Y, Sun J, Gong W, Sun C. Migration of phthalates from plastic packages to convenience foods and its cumulative health risk assessments. FOOD ADDITIVES & CONTAMINANTS PART B-SURVEILLANCE 2019; 12:151-158. [PMID: 30773137 DOI: 10.1080/19393210.2019.1574909] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jinling Yang
- West China School of Public Health, Sichuan University, Chengdu, China
- School of Public Health, Jining Medical University, Jining, China
| | - Weizhong Song
- School of Public Health, Jining Medical University, Jining, China
| | - Xiaojie Wang
- School of Public Health, Jining Medical University, Jining, China
| | - Yongxin Li
- West China School of Public Health, Sichuan University, Chengdu, China
- Provincial Key Laboratory for Food Safety Monitoring and Risk Assessment of Sichuan, Chengdu, China
| | - Jiannan Sun
- School of Public Health, Jining Medical University, Jining, China
| | - Weilei Gong
- School of Public Health, Jining Medical University, Jining, China
| | - Chengjun Sun
- West China School of Public Health, Sichuan University, Chengdu, China
- Provincial Key Laboratory for Food Safety Monitoring and Risk Assessment of Sichuan, Chengdu, China
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35
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Tu D, Garza JT, Coté GL. A SERS aptasensor for sensitive and selective detection of bis(2-ethylhexyl) phthalate. RSC Adv 2019; 9:2618-2625. [PMID: 31681474 PMCID: PMC6823992 DOI: 10.1039/c8ra09230c] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Bis(2-ethylhexyl)phthalate (DEHP) is an endocrine disruptor commonly present in plastic products, such as PVC tubes and water bottles. In this work, a surface enhanced Raman spectroscopy (SERS) based aptasensor was developed and utilized for rapid, easy, sensitive, and specific detection of trace DEHP. A DEHP aptamer was immobilized on magnetic particles. Raman reporter molecule conjugated silver nanoparticles were clustered and coated with silica to provide a stable SERS signal. The SERS silica particle was then functionalized with 1,2,4-benzenetricarboxylic acid 1,2-bis(2-ethylhexyl) ester to increase its affinity to the DEHP aptamer. In the presence of a sample with DEHP, the high-affinity SERS silica particle competes with the DEHP molecule to bind with the aptamer on the magnetic particle. By measuring the signal of free SERS silica particles in the supernatant after magnetic separation, the concentration of DEHP in the sample was quantitatively determined. The developed DEHP aptasensor had a detection range from 0.008 to 182 nM and a limit of detection (LOD) of 8 pM. The aptasensor also showed high selectivity when exposed to interferents with analogous structures. The aptasensor was successfully tested for the detection of DEHP spiked in tap water, bottled water, and a carbonate beverage. The developed SERS-based aptasensor provides a rapid, sensitive, and easy-to-use method for the quantitative detection of DEHP in environmental and food analysis. This paper reports a SERS aptasensor developed to detect DEHP at relevant ranges with ultrasensitive performance and good selectivity.![]()
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Affiliation(s)
- Dandan Tu
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Javier T Garza
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States.,Center for Remote Health Technologies & Systems, Texas A&M Engineering Experiment Station, College Station, Texas 77843, United States
| | - Gerard L Coté
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States.,Center for Remote Health Technologies & Systems, Texas A&M Engineering Experiment Station, College Station, Texas 77843, United States
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36
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Lim HJ, Kim AR, Yoon MY, You Y, Chua B, Son A. Development of quantum dot aptasensor and its portable analyzer for the detection of di-2-ethylhexyl phthalate. Biosens Bioelectron 2018; 121:1-9. [DOI: 10.1016/j.bios.2018.08.065] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 08/24/2018] [Accepted: 08/27/2018] [Indexed: 01/01/2023]
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37
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Akki SU, Werth CJ. Critical Review: DNA Aptasensors, Are They Ready for Monitoring Organic Pollutants in Natural and Treated Water Sources? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8989-9007. [PMID: 30016080 DOI: 10.1021/acs.est.8b00558] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
There is a growing need to monitor anthropogenic organic contaminants detected in water sources. DNA aptamers are synthetic single-stranded oligonucleotides, selected to bind to target contaminants with favorable selectivity and sensitivity. These aptamers can be functionalized and are used with a variety of sensing platforms to develop sensors, or aptasensors. In this critical review, we (1) identify the state-of-the-art in DNA aptamer selection, (2) evaluate target and aptamer properties that make for sensitive and selective binding and sensing, (3) determine strengths and weaknesses of alternative sensing platforms, and (4) assess the potential for aptasensors to quantify environmentally relevant concentrations of organic contaminants in water. Among a suite of target and aptamer properties, binding affinity is either directly (e.g., organic carbon partition coefficient) or inversely (e.g., polar surface area) correlated to properties that indicate greater target hydrophobicity results in the strongest binding aptamers, and binding affinity is correlated to aptasensor limits of detection. Electrochemical-based aptasensors show the greatest sensitivity, which is similar to ELISA-based methods. Only a handful of aptasensors can detect organic pollutants at environmentally relevant concentrations, and interference from structurally similar analogs commonly present in natural waters is a yet-to-be overcome challenge. These findings lead to recommendations to improve aptasensor performance.
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Affiliation(s)
- Spurti U Akki
- Department of Civil and Environmental Engineering , University of Illinois at Urbana-Champaign , 205 North Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Charles J Werth
- Department of Civil, Architecture, and Environmental Engineering , University of Texas at Austin , 301 East Dean Keeton Street , Austin , Texas 78712 , United States
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38
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Diao D, Qiao N, Wu X, Li J, Lou X. An efficient method to evaluate experimental factor influence on in vitro binding of aptamers. Anal Biochem 2018; 556:7-15. [PMID: 29913134 DOI: 10.1016/j.ab.2018.06.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/13/2018] [Accepted: 06/14/2018] [Indexed: 12/11/2022]
Abstract
Nucleic acid-based aptamers are promising alternative to antibodies, however, their selection process (SELEX) is challenging. A number of simulations and few experiments have been reported offering insights into experimental factors (EFs) that govern the effectiveness of the selection process. Though useful, these previous studied were either lack of experimental confirmation, or considered limited EFs. A more efficient experimental method is highly desired. In this study, we developed a fast method that is capable to quantitatively probe the influence of multiple EFs. Based on the fact that the aptamer enrichment efficiency is highly affected by background binding, the binding ratio between the numbers of specific aptamer binders and nonspecific (unselected library) binders per bead was used to quantitatively evaluate EF effects. Taking thrombin and streptavidin as models, three previously studied EFs (surface coverage, buffer composition, and DNA concentration) and four never-studied ones (surface chemistry, heat treatment, elution methodology and pool purity) were investigated. The EFs greatly affected binding ratio (ranging from 0.03 ± 0.03 to 14.60 ± 2.30). The results were in good agreement with the literature, suggesting the good feasibility of our method. Our study provides guidance for the choice of EFs not only for aptamer selection, but also for binding evaluation of aptamers.
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Affiliation(s)
- Donglin Diao
- Department of Chemistry, Capital Normal University, Xisanhuan North Road. 105, Beijing, 100048, China
| | - Na Qiao
- Department of Chemistry, Capital Normal University, Xisanhuan North Road. 105, Beijing, 100048, China
| | - Xiao Wu
- Department of Chemistry, Capital Normal University, Xisanhuan North Road. 105, Beijing, 100048, China
| | - Jiyuan Li
- Department of Chemistry, Capital Normal University, Xisanhuan North Road. 105, Beijing, 100048, China
| | - Xinhui Lou
- Department of Chemistry, Capital Normal University, Xisanhuan North Road. 105, Beijing, 100048, China.
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39
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Zhang Y, Tu J, Wang D, Zhu H, Maity SK, Qu X, Bogaert B, Pei H, Zhang H. Programmable and Multifunctional DNA-Based Materials for Biomedical Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1703658. [PMID: 29389041 DOI: 10.1002/adma.201703658] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 09/09/2017] [Indexed: 06/07/2023]
Abstract
DNA encodes the genetic information; recently, it has also become a key player in material science. Given the specific Watson-Crick base-pairing interactions between only four types of nucleotides, well-designed DNA self-assembly can be programmable and predictable. Stem-loops, sticky ends, Holliday junctions, DNA tiles, and lattices are typical motifs for forming DNA-based structures. The oligonucleotides experience thermal annealing in a near-neutral buffer containing a divalent cation (usually Mg2+ ) to produce a variety of DNA nanostructures. These structures not only show beautiful landscape, but can also be endowed with multifaceted functionalities. This Review begins with the fundamental characterization and evolutionary trajectory of DNA-based artificial structures, but concentrates on their biomedical applications. The coverage spans from controlled drug delivery to high therapeutic profile and accurate diagnosis. A variety of DNA-based materials, including aptamers, hydrogels, origamis, and tetrahedrons, are widely utilized in different biomedical fields. In addition, to achieve better performance and functionality, material hybridization is widely witnessed, and DNA nanostructure modification is also discussed. Although there are impressive advances and high expectations, the development of DNA-based structures/technologies is still hindered by several commonly recognized challenges, such as nuclease instability, lack of pharmacokinetics data, and relatively high synthesis cost.
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Affiliation(s)
- Yuezhou Zhang
- Department of Pharmaceutical Science Laboratory, Åbo Akademi University, 20520, Turku, Finland
| | - Jing Tu
- Department of Pharmaceutical Science Laboratory, Åbo Akademi University, 20520, Turku, Finland
| | - Dongqing Wang
- Department of Radiology, Affiliated Hospital of Jiangsu University Jiangsu University, 212001, Zhenjiang, P. R. China
| | - Haitao Zhu
- Department of Radiology, Affiliated Hospital of Jiangsu University Jiangsu University, 212001, Zhenjiang, P. R. China
| | | | - Xiangmeng Qu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 200241, Shanghai, P. R. China
| | - Bram Bogaert
- Department of Pharmaceutical Science Laboratory, Åbo Akademi University, 20520, Turku, Finland
| | - Hao Pei
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 200241, Shanghai, P. R. China
| | - Hongbo Zhang
- Department of Pharmaceutical Science Laboratory, Åbo Akademi University, 20520, Turku, Finland
- Department of Radiology, Affiliated Hospital of Jiangsu University Jiangsu University, 212001, Zhenjiang, P. R. China
- Turku Center for Biotechnology, Åbo Akademi University, 20520, Turku, Finland
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40
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Wu X, Diao D, Lu Z, Han Y, Xu S, Lou X. Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor. J Vis Exp 2018. [PMID: 29630049 DOI: 10.3791/56814] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Phthalic acid esters (PAEs) areone of the major groups of persistent organic pollutants. The group-specific detection of PAEs is highly desired due to the rapid growing of congeners. DNA aptamers have been increasingly applied as recognition elements on biosensor platforms, but selecting aptamers toward highly hydrophobic small molecule targets, such as PAEs, is rarely reported. This work describes a bead-based method designed to select group-specific DNA aptamers to PAEs. The amino group functionalized dibutyl phthalate (DBP-NH2) as the anchor target was synthesized and immobilized on the epoxy-activated agarose beads, allowing the display of the phthalic ester group at the surface of the immobilization matrix, and therefore the selection of the group-specific binders. We determined the dissociation constants of the aptamer candidates by quantitative polymerization chain reaction coupled with magnetic separation. The relative affinities and selectivity of the aptamers to other PAEs were determined by the competitive assays, where the aptamer candidates were pre-bounded to the DBP-NH2 attached magnetic beads and released to the supernatant upon incubation with the tested PAEs or other potential interfering substances. The competitive assay was applied because it provided a facile affinity comparison among PAEs that had no functional groups for surface immobilization. Finally, we demonstrated the fabrication of an electrochemical aptasensor and used it for ultrasensitive and selective detection of bis(2-ethylhexyl) phthalate. This protocol provides insights for the aptamer discovery of other hydrophobic small molecules.
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Affiliation(s)
- Xiao Wu
- Department of Chemistry, Capital Normal University
| | - Donglin Diao
- Department of Chemistry, Capital Normal University
| | - Zhangwei Lu
- Department of Chemistry, Capital Normal University
| | - Yu Han
- Department of Chemistry, Capital Normal University
| | - Shi Xu
- College of Life Sciences, Capital Normal University
| | - Xinhui Lou
- Department of Chemistry, Capital Normal University;
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41
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Evanescent wave aptasensor for continuous and online aminoglycoside antibiotics detection based on target binding facilitated fluorescence quenching. Biosens Bioelectron 2017; 102:646-651. [PMID: 29268187 DOI: 10.1016/j.bios.2017.12.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 11/22/2017] [Accepted: 12/05/2017] [Indexed: 10/18/2022]
Abstract
The biosensors capable for on-site continuous and online monitoring of pollutants in environment are highly desired due to their practical importance and convenience. The group specific detection of pollutants is especially attractive due to the diversity of environmental pollutants. Here we devise an evanescent wave aptasensor based on target binding facilitated fluorescence quenching (FQ-EWA) for the online continuous and group-specific detection of aminoglycoside antibiotics (AMGAs). In FQ-EWA, a fluorophore labeled DNA aptamer selected against kanamycin was used for both the target recognition in solution and signal transduction on optical fiber of EWA. The aptamers form multiple-strand complex (M-Apt) in the absence of AMGAs. The binding between AMGA and the aptamer disrupts M-Apt and leads to the formation of AMGA -aptamer complex (AMGA-Apt). The photo-induced electron transfer between the fluorophore and AMGA partially quenches the fluorescence of AMGA-Apt. The structure-selective absorption of AMGA-Apt over M-Apt on the graphene oxide further quenches the fluorescence of AMGA-Apt. Meanwhile, the unbound aptamers in solution assemble with the unlabeled aptamers immobilized on the fiber to form M-Apt. The amount of M-Apt on the fiber is inversely proportional to the concentration of AMGAs, enabling the signal-off detection of AMGAs from 200nM to 200μM with a detection limit of 26nM. The whole detection process is carried out in an online mode without any offline operation, providing a great benefit for system automation and miniaturization. FQ-EWA also shows great surface regeneration capability and enables the continuous detection more than 60 times.
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