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- W2969354511 abstract "An ultrasensitive photoelectrochemical (PEC) bioassay for determination of microRNA was proposed based on an integrative photoactive heterojunction nanomaterial to provide the basis of excellent PEC responses and an efficient redox cycling amplification system to improve the detection performances. To establish the bioassay system, the biosensor was firstly modified with Bi2WO6@Bi2S3 and alkaline phosphatase (ALP). The detection solution was composed of ascorbic acid phosphate (AAP) and ferrocenecarboxylic acid (FcA), where ALP converted AAP into ascorbic acid (AA) to trigger a process of redox cycling amplification by reducing FcA+ to FcA, resulting in enhanced photocurrent responses of Bi2WO6@Bi2S3. In the presence of microRNA 21, it could trigger a hybridization chain reaction via the special designed hairpin DNA to produce a long repeated DNA sequences to inhibit ALP activity. Thus the reduced ALP activity and consequently decreased photocurrent signal could be obtained for detection of microRNA 21. As expected, this bioassay system performed the satisfactory performances for the ultrasensitive detection of microRNA 21 in the range from 1 fM to 1 nM with an experimental detection limit of 0.26 fM and acceptable practical applicability. Collectively, an efficient PEC bioassay for microRNA 21 is established and this strategy can be expanded to detect other microRNAs, even other molecules in cells." @default.
- W2969354511 created "2019-08-29" @default.
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- W2969354511 date "2019-10-01" @default.
- W2969354511 modified "2023-09-23" @default.
- W2969354511 title "A novel photoelectrochemical strategy based on an integrative photoactive heterojunction nanomaterial and a redox cycling amplification system for ultrasensitive determination of microRNA in cells" @default.
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- W2969354511 doi "https://doi.org/10.1016/j.bios.2019.111614" @default.
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