Droplet-based microfluidic sensing system for rapid fish freshness determination

Daisuke Itoh, Fumihiro Sassa, Taiji Nishi, Yoko Kani, Masakazu Murata, Hiroaki Suzuki

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


A microfluidic device was constructed for on-site determination of fish freshness by using adenosine-5′-triphosphate (ATP) concentration as an indicator of freshness. In the device, extracts from fish and reagent solutions were processed in the form of droplets separated by air. The volumes of the droplets of the extract solution, a solution containing enzyme substrates, and a washing buffer solution were measured in branched flow channels. To simplify the structure and procedure for mixing solutions, a wider portion was formed in one flow channel to merge the droplets. A row of droplets was ejected from each of three branched flow channels, merged in the wider portion, and transported to a sensing region located downstream. ATP was detected using two enzymatic reactions involving glycerol kinase (GK) and glycerol-3-phosphate oxidase (G3PO). A linear relationship between the generated current and ATP concentration was confirmed, and ATP detection from jack mackerel extracts was carried out. A distinct change in the current was observed with the fresh extracts as in the case of standard solutions. The obtained data correlated well with those obtained by high-performance liquid chromatography (HPLC).

Original languageEnglish
Pages (from-to)619-626
Number of pages8
JournalSensors and Actuators, B: Chemical
Publication statusPublished - Aug 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


Dive into the research topics of 'Droplet-based microfluidic sensing system for rapid fish freshness determination'. Together they form a unique fingerprint.

Cite this