Multiplex MicroRNA Detection on a Surface-Functionalized Power-Free Microfluidic Chip

Ryo Ishihara, Ryoichi Kitane, Yoshitsugu Akiyama, Shoko Inomata, Kazuo Hosokawa, Mizuo Maeda, Akihiko Kikuchi

Research output: Contribution to journalArticlepeer-review


Circulating microRNAs (miRNAs) have emerged as promising cancer biomarkers because their concentration profiles in body fluids are associated with the type and clinical stage of cancer. For multiplex miRNA detection, a novel surfacefunctionalized power-free microfluidic chip (SF-PF microchip) has been developed. The inner surface of the SF-PF microchip microchannels was functionalized via electron beam-induced graft polymerization and immobilization of capture probe DNAs. Simultaneous and specific duplex miRNA detection was achieved on the line-type SF-PF microchip with detection limits of 19.1 and 47.6 nmol L–1for hsa-miR-16 and hsa-miR-500a-3p, respectively. Moreover, simultaneous and specific triplex miRNA detection was achieved on the stripe-type SF-PF microchip. The sample volume required for this microchip was 0.5 μL, and the time required for detection was 17 min. These results indicate that up to six types of miRNAs could be detected without compromising the advantages of the previous SF-PF microchips for cancer point-of-care testing.

Original languageEnglish
Pages (from-to)747-751
Number of pages5
JournalAnalytical Sciences
Issue number5
Publication statusPublished - May 2021


  • Surface-functionalized power-free microfluidic chip
  • biomarkers
  • cancer
  • multiplex microRNA detection
  • point-of-care testing


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