Gold nanoparticle/MXene for multiple and sensitive detection of oncomiRs based on synergetic signal amplification

Mohsen Mohammadniaei, Aneesh Koyappayil, Yi Sun, Junhong Min*, Min-Ho Lee*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review


Multiple and sensitive detection of oncomiRs for accurate cancer diagnostics is still a challenge. Here, a synergetic amplification strategy was introduced by combining a MXene-based electrochemical signal amplification and a duplex-specific nuclease (DSN)-based amplification system for rapid, attomolar and concurrent quantification of multiple microRNAs on a single platform in total plasma. Synthesized MXene-Ti3C2Tx modified with 5 nm gold nanoparticles (AuNPs) was tasted on a dual screen-printed gold electrode to host vast numbers of DNA probes identically co-immobilized on dedicated electrodes. Interestingly, presence of MXene provided biofouling resistance and enhanced the electrochemical signals by almost 4 folds of magnitude, attributed to its specious surface area and remarkable charge mobility. The 5 nm AuNPs were perfectly distributed within the whole flaky architect of the MXene to give rise to the electrochemical performance of MXene and provide the thiol-Au bonding feature. This synergetic strategy reduced the DSN-based biosensors' assay time to 80 min, provided multiplexability, antifouling activity, substantial sensitivity and specificity (single mutation recognition). The limit of detection of the proposed biosensor for microRNA-21 and microRNA-141 was respectively 204 aM and 138 aM with a wide linear range from 500 aM to 50 nM. As a proof of concept, this newly-developed strategy was coupled with a 96-well adaptive sensing device to successfully profile three cancer plasma samples based on their altered oncomiR abundances.
Original languageEnglish
Article number112208
JournalBiosensors and Bioelectronics
Number of pages9
Publication statusPublished - 2020


  • MicroRNA
  • Multiple detection
  • Electrochemical
  • Biosensor
  • Duplex specific nuclease
  • MXene


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