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Sun H, Guan J, Chai H, Yu K, Qu L, Zhang X, Zhang G. Zinc porphyrin/MXene hybrids with phosphate-induced stimuli-responsive behavior for dual-mode fluorescent/ electrochemiluminescent ratiometric biosensing. Biosens Bioelectron 2024; 251:116080. [PMID: 38324972 DOI: 10.1016/j.bios.2024.116080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/12/2024] [Accepted: 01/25/2024] [Indexed: 02/09/2024]
Abstract
Highly sensitive ratiometric biosensors have attracted much attention in biomarker detection, but most rely on single-mode signals, which can affect accuracy. The development of new principles and methods for dual-mode ratiometric sensing can enhance detection accuracy. Herein, the zinc(II) meso-tetra(4-carboxyphenyl) porphyrin/MXene (ZnTCPP/Ti3C2Tx) hybrids with phosphate-induced stimuli-responsive behavior are used to develop a novel dual-mode fluorescent/electrochemiluminescent (FL/ECL) ratiometric biosensor. The composites exhibit FL quenching and enhanced ECL behavior involving dissolved O2. The FL quenching of ZnTCPP/Ti3C2Tx is caused by energy transfer (EnT) and photo-induced electron transfer (PET) from ZnTCPP to Ti3C2Tx. While the introduction of MXene compensates for the inadequate conductivity of ZnTCPP, facilitating electron transfer, which further makes the surface ZnTCPP more capable of activating O2 to produce singlet oxygen (1O2), thereby generating enhanced cathodic ECL. Furthermore, phosphate ions (PO43-) can interact with the Ti sites of ZnTCPP/Ti3C2Tx, leading to competition for coordination with ZnTCPP, which in turn detaches ZnTCPP, resulting in enhanced FL and reduced ECL. On the basis of the phosphate-induced stimuli-responsive behavior, the dual-mode FL/ECL ratiometric biosensing of alkaline phosphatase (ALP) is achieved through ALP-catalyzed production of PO43- cascade effect with ZnTCPP/Ti3C2Tx. The linear detection range for ALP is 0.1-50 mU/mL, with a detection limit as low as 0.0083 mU/mL. This proposed ZnTCPP/Ti3C2Tx composites with stimuli-responsive behavior is expected to provide new ideas for the development of high-sensitivity dual-mode ratiometric biosensors with promising applications in the precise detection of important biomarkers.
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Affiliation(s)
- Huayue Sun
- Research Center for Intelligent and Wearable Technology, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, China
| | - Jing Guan
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, China
| | - Huining Chai
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266520, China.
| | - Kun Yu
- Research Center for Intelligent and Wearable Technology, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, China
| | - Lijun Qu
- Research Center for Intelligent and Wearable Technology, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, China
| | - Xueji Zhang
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Guangyao Zhang
- Research Center for Intelligent and Wearable Technology, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, China.
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Momeni F, Khoshfetrat SM, Bagheri H, Zarei K. Ti 3C 2 MXene-based nanozyme as coreaction accelerator for enhancing electrochemiluminescence of glucose biosensing. Biosens Bioelectron 2024; 250:116078. [PMID: 38295578 DOI: 10.1016/j.bios.2024.116078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 01/21/2024] [Accepted: 01/25/2024] [Indexed: 02/02/2024]
Abstract
Delamination of the exfoliated multilayer MXenes with electro-catalysts, not only leads to increasing surface area for high electrochemiluminescent (ECL) signal tracer loading but also provides highly sensitive achievements in a coreaction accelerator manner. To this end, herein, we used bromophenol blue (BPB)-delaminated multilayer Ti3C2 MXene as both a coreaction accelerator to promote the electrochemiluminescent (ECL) reaction rate of luminol (LUM) and the co-reactant H2O2 and a substrate for retaining high loading of glucose oxidase (GOx)-conjugated polyethylene imine (PEI) along with luminophore species into more open structure of Ti3C2 MXene for sensitive detection of glucose. In the presence of glucose, in situ generating H2O2 product through a GOx-catalyzed process could produce abundant •OH radicals via the peroxidase-like activity of the BPB@Ti3C2 in the LUM ECL reaction. Moreover, decreasing the distance between the high-content LUM into the BPB@Ti3C2 and the generated •OH, minimizes the decomposition of highly active •OH, providing a superb ECL signal. Last, the proximity of incorporated GOx into the delaminated Ti3C2 MXene near the electrode allows efficient electron transfer between the electrode and enzyme. The integration of such amplifying effects endowed high sensitivity and excellent selectivity for glucose with a low limit of detection of 0.02 μM in the wide range of 0.01 μM-40,000 μM, enabling the feasibility of the glucose analysis in human serum samples. Overall, the enhanced ECL based on the BPB@Ti3C2 opens a new horizon to develop highly sensitive MXene-based ECL toward the field of biosensors.
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Affiliation(s)
| | - Seyyed Mehdi Khoshfetrat
- Biosensor and Energy Research Center, Faculty of Basic Science, Ayatollah Boroujerdi University, Boroujerd, Iran.
| | - Hasan Bagheri
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Kobra Zarei
- School of Chemistry, Damghan University, Damghan, Iran.
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Liu WJ, Wang LJ, Zhang CY. Progress in quantum dot-based biosensors for microRNA assay: A review. Anal Chim Acta 2023; 1278:341615. [PMID: 37709484 DOI: 10.1016/j.aca.2023.341615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 06/15/2023] [Accepted: 07/11/2023] [Indexed: 09/16/2023]
Abstract
MicroRNAs (miRNAs) are responsible for post-transcriptional gene regulation, and may function as valuable biomarkers for diseases diagnosis. Accurate and sensitive analysis of miRNAs is in great demand. Quantum dots (QDs) are semiconductor nanomaterials with superior optoelectronic features, such as high quantum yield and brightness, broad absorption and narrow emission, long fluorescence lifetime, and good photostability. Herein, we give a comprehensive review about QD-based biosensors for miRNA assay. Different QD-based biosensors for miRNA assay are classified by the signal types including fluorescent, electrochemical, electrochemiluminescent, and photoelectrochemical outputs. We highlight the features, principles, and performances of the emerging miRNA biosensors, and emphasize the challenges and perspectives in this field.
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Affiliation(s)
- Wen-Jing Liu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China
| | - Li-Juan Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
| | - Chun-Yang Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China.
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Chen Y, Jiang S, Hu Y, Gong J. Enhanced electrochemiluminescence bioassay triggered by intracellular leakage for detection of Escherichia coli. Biosens Bioelectron 2021; 194:113575. [PMID: 34438339 DOI: 10.1016/j.bios.2021.113575] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 10/20/2022]
Abstract
An intracellular leakage-trigged signal-on solid-state electrochemiluminescent (ECL) assay is developed for the detection of Escherichia coli (E. coli). A self-assembled multilayer ensemble of N, S co-doped carbon dots -poly dimethyl diallylammonium chloride grafted carbon nanospheres is used as ECL luminophores with peroxydisulfate (PS) ions as coreactants. The incorporation of molecularly imprinted electrospun nanofibers with the multilayer ensemble enables a robust, highly selective solid-state ECL probe without using any expensive and fragile biological receptor. Upon the imprinted E. coli exposed to the assay, under bactericidal effects of PS ions by destroying the integrity of E. coli cell membrane, intracellular leakage K+-triggered ECL enhancement is first disclosed via prompting the involved 1O2-mediated ECL process. Benefiting from the ECL enhancement upon increasing the concentration of E. coli, a unique intracellular leakage-trigged signal-on ECL system is created for sensing E. coli. Such a assay is proved to be highly specific and sensitive for sensing E. coli in the concentration range from 5 to 107 cfu mL-1, achieving a detection limit of 1 cfu mL-1 (S/N = 3). This label-free, simple and facile assay provides a promising point-of-care diagnostic tool for pathogen detection.
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Affiliation(s)
- Yuxin Chen
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Shumin Jiang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Yachen Hu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China
| | - Jingming Gong
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China.
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Hong G, Zou Z, Huang Z, Deng H, Chen W, Peng H. Split-type electrochemiluminescent gene assay platform based on gold nanocluster probe for human papillomavirus diagnosis. Biosens Bioelectron 2021; 178:113044. [PMID: 33550162 DOI: 10.1016/j.bios.2021.113044] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/06/2021] [Accepted: 01/24/2021] [Indexed: 12/27/2022]
Abstract
Persistent high-risk human papillomavirus (HPV) infection is the leading cause of cervical cancer. Efficient detection of HPV16 E7 is necessary for early diagnosis and cure of the disease. Here, a novel and high-performance Au nanocluster (AuNC) probe-based split-type electrochemiluminescent (ECL) assay platform has been established to detect these oncogenes, in which the nucleic acid hybridization assay and the ECL measurements are performed independently. The proposed approach combines superior magnetic nanobead enrichment and separation technology, specific nucleic acid hybridization technology, and high-efficiency AuNC probe ECL strategy, and shows excellent advantages. First, the split-type ECL sensing platform can effectively avoid interference from biological samples and adequately uses the ECL efficiency of the AuNC probe. Furthermore, the ultrahigh sensitivity assay of HPV DNA can be achieved without any complex nucleic acid amplification technique. Taking advantage of the above merits of split-type detection, the ECL DNA sensor achieved ideal low detection of 6.8 aM and a wide dynamic range bridging 10 orders of magnitude HPV16 E7. Furthermore, together with its favorable and powerful specificity, high sensitivity, and good selectivity, this strategy could detect HPV16 E7 DNA in human samples, which showed great consistency with the FDA-approved approach (Hybrid capture 2, HC2). Therefore, this work proposes a facile and reliable split-type ECL platform for HPV diagnosis and shows great potential for the early diagnosis of other diseases.
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Affiliation(s)
- Guolin Hong
- School of Clinical Medicine, Fujian Medical University, Fuzhou, 350004, China; Department of Laboratory Medicine, Xiamen Key Laboratory of Genetic Testing, The First Affiliated Hospital of Xiamen University, Xiamen, 361003, China
| | - Zhiyan Zou
- School of Clinical Medicine, Fujian Medical University, Fuzhou, 350004, China; Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou, 350004, China
| | - Zhongnan Huang
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou, 350004, China
| | - Haohua Deng
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou, 350004, China
| | - Wei Chen
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou, 350004, China.
| | - Huaping Peng
- Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou, 350004, China.
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Pan D, Chen K, Zhou Q, Zhao J, Xue H, Zhang Y, Shen Y. Engineering of CdTe/SiO 2 nanocomposites: Enhanced signal amplification and biocompatibility for electrochemiluminescent immunoassay of alpha-fetoprotein. Biosens Bioelectron 2019; 131:178-184. [PMID: 30831420 DOI: 10.1016/j.bios.2019.02.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 02/01/2019] [Accepted: 02/05/2019] [Indexed: 10/27/2022]
Abstract
Electrochemiluminescent (ECL) performance and cytotoxicity of CdTe quantum dots (QDs)-based nanocomposites and its possible application for ECL immunoassay were investigated. Two types of CdTe-based nanocomposites, i.e., SiO2-coated CdTe (CdTe@SiO2) and CdTe-functionalized SiO2 (SiO2@CdTe), were synthesized and comprehensively compared in regarding of the cytotoxicity and ECL performance. The in vitro cytotoxicity of SiO2@CdTe and CdTe@SiO2 nanoparticles was assessed in L02 cells using standard CCK-8 assay, and their ECL performance was investigated by constructing sandwiched immunosensor using SiO2@CdTe and CdTe@SiO2 as tags for the labelled antibody, respectively. The results showed that CdTe@SiO2 exhibited much lower cytotoxicity and a higher ECL intensity than SiO2@CdTe. Taking the analysis of alpha-fetoprotein (AFP) as an example, the ECL immunosensor using CdTe@SiO2 as an emitter was proved to have a wide linear dynamic range from 1.0 pg mL-1 to 100 ng mL-1 with a low detection limit of 0.22 pg mL-1 (S/N ratio of 3). The ECL immunosensor also demonstrated satisfactory recovery and excellent reproducibility and stability, indicating that this method has prospects in practical application in the clinical diagnosis of AFP.
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Affiliation(s)
- Deng Pan
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China
| | - Kaiyang Chen
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China
| | - Qing Zhou
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China
| | - Jinjin Zhao
- Department of Clinical Laboratory, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang 453000, Henan, China
| | - Huaijia Xue
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China
| | - Yuanjian Zhang
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China
| | - Yanfei Shen
- Medical School, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210009, China.
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Hanif A, Farooq R, Rehman MU, Khan R, Majid S, Ganaie MA. Aptamer based nanobiosensors: Promising healthcare devices. Saudi Pharm J 2018; 27:312-319. [PMID: 30976173 PMCID: PMC6438676 DOI: 10.1016/j.jsps.2018.11.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 11/22/2018] [Indexed: 12/20/2022] Open
Abstract
Nanobiosensors based on aptamer are extensively being studied as potent analytical tools in clinical analysis. These biosensors provide high sensitivity, fast response, specificity and desired portability in addition to simplicity and decreased cost compared to conventional methods. The purpose of this manuscript is to provide readers with an overview of current advances about electrochemical, electrochemiluminescent and photoelectrochemical aptasensors from the sea of available literature. These are mainly used for determination of protein-based biomarkers, especially for cancer diagnosis. Here in we have given special emphasis on nanosize-based aptasensors which have been reported to show considerable improvement in the analytical performance.
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Affiliation(s)
- Aamir Hanif
- City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region
| | - Rabia Farooq
- Department of Biochemistry, Govt Medical College (GMC) Srinagar, J&K 190010, India
- Corresponding author at: Department of Biochemistry, Govt Medical College Srinagar, India.
| | - Muneeb U. Rehman
- Department of Biochemistry, Govt Medical College (GMC) Srinagar, J&K 190010, India
| | - Rehan Khan
- Nanotherapeutics, Institute of Nanoscience & Technology (DST-INST), Habitat Centre Phase 10, Mohali, Punjab, India
| | - Sabhiya Majid
- Department of Biochemistry, Govt Medical College (GMC) Srinagar, J&K 190010, India
| | - Majid Ahmad Ganaie
- Department of Pharmacology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
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Xu H, Liang S, Zhu X, Wu X, Dong Y, Wu H, Zhang W, Chi Y. Enhanced electrogenerated chemiluminescence behavior of C 3N 4 QDs@ C 3N 4 nanosheet and its signal-on aptasensing for platelet derived growth factor. Biosens Bioelectron 2016; 92:695-701. [PMID: 27829561 DOI: 10.1016/j.bios.2016.10.026] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 10/10/2016] [Accepted: 10/13/2016] [Indexed: 01/27/2023]
Abstract
A novel g-C3N4 nanosheets embedded with C3N4 QDs nanocomposites (QD@CNNS) was prepared by simple oxidation using hydrogen peroxide and UV light irradiation. This nanocomposite exhibits more stable and stronger electrochemiluminescent (ECL) behavior compared with CNNS. Coupling this nanocomposite with Fc-labeled aptamer, a signal-on aptasensor for platelet derived growth factor BB (PDGF-BB) is fabricated. Initially, the Fc-labeled aptamer binds onto QD@CNNS via π-π conjugation and electrostatic interaction, quenching ECL emission from QD@CNNS. The introduction of target efficiently recovers the ECL signal by the formation of PDGF-BB/aptamer complex. The ECL intensity is proportion to the concentration of PDGF-BB in the range of 0.02-80nM with a detection limit of 0.013nM. This work demonstrates a simple synthesis method to obtain QD@CNNS with excellent ECL behavior, and opens up the application of g-C3N4 nanocomposite in signal-on aptasensing.
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Affiliation(s)
- Huifeng Xu
- MOE Key Laboratory of Analysis and Detection for Food Safety, State Key Laboratory of Photo catalysis on Energy and Environment, and College of Chemistry, Fuzhou University, Fujian 350108, PR China; Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, PR China
| | - Shijing Liang
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Xi Zhu
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China
| | - Xiuqin Wu
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Yongqiang Dong
- MOE Key Laboratory of Analysis and Detection for Food Safety, State Key Laboratory of Photo catalysis on Energy and Environment, and College of Chemistry, Fuzhou University, Fujian 350108, PR China
| | - Haishan Wu
- MOE Key Laboratory of Analysis and Detection for Food Safety, State Key Laboratory of Photo catalysis on Energy and Environment, and College of Chemistry, Fuzhou University, Fujian 350108, PR China
| | - Wenxia Zhang
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, PR China
| | - Yuwu Chi
- MOE Key Laboratory of Analysis and Detection for Food Safety, State Key Laboratory of Photo catalysis on Energy and Environment, and College of Chemistry, Fuzhou University, Fujian 350108, PR China.
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Liu W, Zhou X, Xing D. Rapid and reliable microRNA detection by stacking hybridization on electrochemiluminescent chip system. Biosens Bioelectron 2014; 58:388-94. [PMID: 24705177 DOI: 10.1016/j.bios.2014.02.082] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 02/12/2014] [Accepted: 02/24/2014] [Indexed: 01/09/2023]
Abstract
MicroRNAs play pivotal roles in many fundamental aspects of life. Because microRNAs have the characteristics of small size, similar sequence, and low abundance, it is challenging to identify microRNAs rapidly and specifically with high sensitivity. Herein, we developed an electrochemiluminescent (ECL) chip system for microRNA detection based on base-stacking hybridization and magnetic microparticle enrichment technology. In the designed system, the integration of the microfluidic system with ECL detection made it easy to assemble the multiple assay steps and allowed the construction of a device that is convenient to carry. A limit of detection of 1fmol was achieved with this assay. The proposed direct optical microRNA detection technique demonstrated an acceptable sensitivity combined with the advantages of reliability and rapidity.
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Affiliation(s)
- Weipeng Liu
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Xiaoming Zhou
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
| | - Da Xing
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
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Yuan Y, Wei S, Liu G, Xie S, Chai Y, Yuan R. Ultrasensitive electrochemiluminescent aptasensor for ochratoxin A detection with the loop-mediated isothermal amplification. Anal Chim Acta 2013; 811:70-5. [PMID: 24456596 DOI: 10.1016/j.aca.2013.11.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 11/02/2013] [Accepted: 11/08/2013] [Indexed: 10/26/2022]
Abstract
In this study, we for the first time presented an efficient, accurate, rapid, simple and ultrasensitive detection system for small molecule ochratoxin A (OTA) by using the integration of loop-mediated isothermal amplification (LAMP) technique and subsequently direct readout of LAMP amplicons with a signal-on electrochemiluminescent (ECL) system. Firstly, the dsDNA composed by OTA aptamer and its capture DNA were immobilized on the electrode. After the target recognition, the OTA aptamer bond with target OTA and subsequently left off the electrode, which effectively decreased the immobilization amount of OTA aptamer on electrode. Then, the remaining OTA aptamers on the electrode served as inner primer to initiate the LAMP reaction. Interestingly, the LAMP amplification was detected by monitoring the intercalation of DNA-binding Ru(phen)3(2+) ECL indictors into newly formed amplicons with a set of integrated electrodes. The ECL indictor Ru(phen)3(2+) binding to amplicons caused the reduction of the ECL intensity due to the slow diffusion of Ru(phen)3(2+)-amplicons complex to the electrode surface. Therefore, the presence of more OTA was expected to lead to the release of more OTA aptamer, which meant less OTA aptamer remained on electrode for producing LAMP amplicons, resulting in less Ru(phen)3(2+) interlaced into the formed amplicons within a fixed Ru(phen)3(2+) amount with an obviously increased ECL signal input. As a result, a detection limit as low as 10 fM for OTA was achieved. The aptasensor also has good reproducibility and stability.
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Affiliation(s)
- Yali Yuan
- Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China; College of Resources and Environments, Southwest University, Chongqing 400715, PR China
| | - Shiqiang Wei
- College of Resources and Environments, Southwest University, Chongqing 400715, PR China
| | - Guangpeng Liu
- College of Resources and Environments, Southwest University, Chongqing 400715, PR China
| | - Shunbi Xie
- Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Yaqin Chai
- Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
| | - Ruo Yuan
- Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
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