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Shi J, Li S, Shao R, Jiang Y, Qiao Y, Liu J, Zhou Y, Li Y. Electrochemiluminescence aptasensing method for ultrasensitive determination of lipopolysaccharide based on CRISPR-Cas12a accessory cleavage activity. Talanta 2024; 272:125828. [PMID: 38428132 DOI: 10.1016/j.talanta.2024.125828] [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: 10/26/2023] [Revised: 02/17/2024] [Accepted: 02/22/2024] [Indexed: 03/03/2024]
Abstract
In this study, an ultrasensitive electrochemiluminescence (ECL) aptasensing method was developed for lipopolysaccharide (LPS) determination based on CRISPR-Cas12a accessory cleavage activity. Tris (2,2'-bipyridine) dichlororuthenium (II) (Ru(bpy)32+) was adsorbed on the surface of a glassy carbon electrode (GCE) coated with a mixture of gold nanoparticles (AuNPs) and Nafion film via electrostatic interaction. The obtained ECL platform (Ru(bpy)32+/AuNP/Nafion/GCE) exhibited strong ECL emission. Thiol-functionalized single-stranded DNA (ssDNA) was modified with a ferrocenyl (Fc) group and autonomously assembled on the ECL platform of Ru(bpy)32+/AuNP/Nafion/GCE via thiol-gold bonding, resulting in the quenching of ECL emission. After hybridization of the LPS aptamer strand (AS) with its partial complementary strand (CS), the formed double-stranded DNA (dsDNA) could activate CRISPR-Cas12a to indiscriminately cleave ssDNA-Fc on the surface of Ru(bpy)32+/AuNP/Nafion/GCE, resulting in recovery of the ECL intensity of Ru(bpy)32+ due to the increasing distance between Fc and the electrode surface. The combination of LPS and AS suppressed the formation of dsDNA, inhibited the activation of CRISPR-Cas12a, and prevented further cleavage of ssDNA-Fc. This mechanism aided in upholding the integrity of ssDNA-Fc on the surface of the electrode and was combined with ECL quenching induced by the target. The ECL intensity decreased linearly as the concentration of LPS increased from 1 to 50,000 pg/mL and followed a logarithmic relationship. This method exhibited a remarkably low detection limit of 0.24 pg/mL, which meets the requirement for low-concentration detection of LPS in the human body. The proposed method demonstrates the capacity of CRISPR-Cas12a to perform non-specific cutting of single-stranded DNA and transform the resultant cutting substances into changes in the ECL signal. By amalgamating this approach with the distinct identification abilities of LPS and its aptamers, a simple, responsive, and discriminatory LPS assay was established that holds immense significance for clinical diagnosis.
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Affiliation(s)
- Jiayue Shi
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China
| | - Sijia Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China
| | - Rongguang Shao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China
| | - Yang Jiang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China
| | - Yanxia Qiao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China
| | - Jin Liu
- Shaanxi Key Laboratory of Catalysis, School of Chemistry and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, 723000, China.
| | - Yaqian Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China.
| | - Yan Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China.
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Yang X, Li J, Tan X, Yang X, Song P, Ming D, Yang Y. Ratiometric fluorescence probe integrated with smartphone for visually detecting lipopolysaccharide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 286:121961. [PMID: 36265302 DOI: 10.1016/j.saa.2022.121961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 09/23/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
A portable instrument-free detection method for lipopolysaccharide (LPS) analysis was developed based on dual-emission ratiometric fluorescence sensing system. Herein, red-emitting Au nanoclusters (Au NCs) were as reference probe, while blue-emitting fluorescent silica quantum dots (Si QDs) were as response probe. Additionally, the aptamer of LPS was covalently grafted to the surface of Si QDs in order to specific recognize the LPS. According to the changes of fluorescence intensityratio (FL ratio, I461 nm/I643 nm) with the concentrations of LPS, the linear equation was fitted with the range of 50-3000 ng/mL, and the limit of detection (LOD) was 29.3 ng/mL. As a practical application, this method was employed to analyze LPS in normal saline with the recovery rate of 97.7-103.8 %. The color picker platform in the smartphone was used to transform the detection picture to the process of Red, Green and Blue (RGB) for visual detection of LPS. The low-cost and easy-carry method reported here presents broad merits for the visually quantitative detection of LPS.
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Affiliation(s)
- Xinyu Yang
- College of Biological and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, PR China; College of Food and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Jiayi Li
- College of Food and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Xinhui Tan
- College of Food and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China
| | - Xuejiao Yang
- College of Pharmacy, Nanjing Tech University, Nanjing 211816, PR China
| | - Ping Song
- College of Food and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China.
| | - Dengming Ming
- College of Biological and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
| | - Yaqiong Yang
- College of Food and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, PR China.
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Posha B, Kuttoth H, Sandhyarani N. Layer-by-Layer Assembly of Polycations and Polyanions for the Sensitive Detection of Endotoxin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:257-265. [PMID: 33356305 DOI: 10.1021/acs.langmuir.0c02852] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Bacterial endotoxin detection is an essential safety requisite in biomedical, food, and pharmaceutical industries. Endotoxin in a sufficient concentration on entering the human bloodstream causes detrimental effects such as septic shock, which can lead to death. Hence, the sensitive and selective detection of endotoxin also known as lipopolysaccharide (LPS) is of paramount importance. Herein, a layer-by-layer (LBL) assembly of gold-chitosan nanocomposite (CGNC)-poly(acrylic acid) (PAA)-polymyxin B (PmB) on gold (Au) electrode is employed for the sensitive and selective detection of endotoxin. The surface electric charge studies using dynamic contact mode electrostatic force microscopy (DC-EFM) revealed the successful formation of each layer on the Au electrode. The polycationic PmB is a specific bioreceptor of LPS, which binds with high affinity to the anionic groups of the carbohydrate portions of LPS molecules and facilitates the selective electrochemical detection. This surface modification method presented a sensitive and selective detection of endotoxin down to the attogram level.
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Affiliation(s)
- Biyas Posha
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
| | - Haritha Kuttoth
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
| | - N Sandhyarani
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Calicut 673601, Kerala, India
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Chen T, Sheng A, Hu Y, Mao D, Ning L, Zhang J. Modularization of three-dimensional gold nanoparticles/ferrocene/liposome cluster for electrochemical biosensor. Biosens Bioelectron 2019; 124-125:115-121. [DOI: 10.1016/j.bios.2018.09.101] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 09/18/2018] [Accepted: 09/30/2018] [Indexed: 12/30/2022]
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Choi CA, Mazrad ZAI, Lee G, In I, Lee KD, Park SY. Boronate-based fluorescent carbon dot for rapid and selectively bacterial sensing by luminescence off/on system. J Pharm Biomed Anal 2018; 159:1-10. [DOI: 10.1016/j.jpba.2018.06.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 06/22/2018] [Accepted: 06/22/2018] [Indexed: 12/16/2022]
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Zhang Z, Yang J, Pang W, Yan G. An aptamer-based fluorescence probe for facile detection of lipopolysaccharide in drinks. RSC Adv 2017. [DOI: 10.1039/c7ra10710b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An alternative fluorescence strategy for specific and convenient detection of lipopolysaccharide in drink was developed.
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