Simultaneous detection of exosomal microRNAs by nucleic acid functionalized disposable paper-based sensors
CHEMICAL ENGINEERING JOURNAL(2022)
摘要
Compared with free microRNAs (miRNAs) in blood, miRNAs in exosomes are more abundant and stable. However, simple, reliable and simultaneous detection of exosomal microRNAs remains a challenging. In this study, we proposed a disposable paper-based electrochemical strategy based on nucleic acid functionalized ZrMOF, which is label-free and enzyme-free, and could simultaneously detect multiple tumor exosomal miRNAs. We constructed a functionalized metal-organic framework (MOF) with electroactive dyes and capped it with hairpin DNA. This proposed bio-platform and MOF can display different electrochemical signals for different target analyses by changing the structures of dye-loaded and hairpin DNA. In view of this, we skill fully designed two kinds of functional MOFs (Zr/MB and Zr/BG) and used them to simultaneously detect exosomal miRNA-155 and exosomal miRNA-21 (as proof-of-concept analysis). This robust biosensor eliminates multiple timeconsuming steps associated with existing miRNAs quantification methods, such as reverse transcription and thermocycler amplification, and achieves molecular-level sensitivity to exosomal miRNA-155 (33.4 aM) and exosomal miRNA-21 (23.1 aM). This study combines the advantages of simultaneous biosensing, which disposable paper-based biosensing strategies and represents an important advance in the field of electrochemical analysis and provides unlimited possibilities for the development of flexible, easy-to-use, and inexpensive bioelectrodes.
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关键词
Exosomal miRNAs, Paper-based, Biosensor, Metal organic frameworks, Disposable
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