Nonlinear concentration gradients regulated by the width of channels for observation of half maximal inhibitory concentration (IC<inf>50</inf>) of transporter proteins

Yuta Abe, Koki Kamiya, Toshihisa Osaki, Hirotaka Sasaki, Ryuji Kawano, Norihisa Miki, Shoji Takeuchi

Research output: Contribution to journalArticle

6 Citations (Scopus)


This paper describes a simple microfluidic device that can generate nonlinear concentration gradients. We changed the "width" of channels that can drastically shorten the total microfluidic channel length and simplify the microfluidic network design rather than the "length" of channels. The logarithmic concentration gradients generated by the device were in good agreement with those obtained by simulation. Using this device, we evaluated a probable IC<inf>50</inf> value of the ABC transporter proteins by the competitive transport assays at five different logarithmic concentrations. This probable IC<inf>50</inf> value was in good agreement with an IC<inf>50</inf> value (0.92 μM) obtained at the diluted concentrations of seven points.

Original languageEnglish
Pages (from-to)5557-5562
Number of pages6
Issue number16
Publication statusPublished - 2015 Aug 21


ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Electrochemistry
  • Biochemistry
  • Environmental Chemistry

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