Abstract
A label-free electrochemical aptasensor is reported for sensitive detection of the 6-kDa early secreted antigenic target (ESAT-6). For the first time, the bimetallic organic framework (b-MOF) of Zr-MOF-on-Ce-MOF was decorated with nitrogen-doped graphene (NG) and applied as the matrix for electroactive toluidine blue (Tb) to form the NG@Zr-MOF-on-Ce-MOF@Tb nanohybrid. The prepared nanohybrid with excellent hydrophilicity, dispersibility, and large specific surface exhibited significant electrochemical response. This nanohybrid could be directly used for anchoring ESAT-6 binding aptamers (EBA) through the interaction between the 5′-phosphate group (PO43−) of EBA and Zr4+ of Zr-MOF. The signal response before and after incubating the ESAT-6 antigen has been evaluated by cyclic voltammetry at a scan rate of 100 mV s−1 from − 0.7 to 0.3 V (vs. SCE). Under optimal conditions, the proposed aptasensor displayed a wide linear range from 100 fg mL−1 to 10 ng mL−1 with a limit of detection (LOD) of 12 fg mL−1. The developed method showed good reproducibility with a relative standard deviation (RSD) of 2.27%. The aptasensor showed favorable results in the analysis of the real samples. With these merits, the aptasensor has exceptional potential as a diagnostic tool for tuberculosis in clinical practice.
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Funding
This work is supported by National Natural Science Foundation of China (82072378, 81601856), Chongqing Talent Program, China (CQYC202005015), Ba Yu Scholar Program, China (YS2019020), Funds for High Level Young Science and Technology Talent Cultivation Plan in Chongqing Medical University, China (2019), Discipline Talent Training Program of College of Pharmacy in Chongqing Medical University, China (YXY2019XSGG4), and Funds for Young Science and Technology Talent Cultivation Plan of Chongqing City (cstc2014kjrc-qnrc00004).
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Jiaojiao Xie: conceptualization, methodology, formal analysis, writing—original draft, visualization. Zhaode Mu: conceptualization, investigation, resources. Bin Yan: software, supervision, visualization. Jie Wang: software. Jing Zhou: investigation, software. Lijuan Bai: methodology, resources, writing—review and editing, funding acquisition.
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Xie, J., Mu, Z., Yan, B. et al. An electrochemical aptasensor for Mycobacterium tuberculosis ESAT-6 antigen detection using bimetallic organic framework. Microchim Acta 188, 404 (2021). https://doi.org/10.1007/s00604-021-05058-8
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DOI: https://doi.org/10.1007/s00604-021-05058-8