Immuno-chromatographic cortisol biosensor using enzyme-labeled conjugate

Yusuke Tahara, Suguru Yoshikawa, Vivek Shetty, Masaki Yamaguchi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


To replace time-consuming laboratory analysis and facilitate point-of-care measurement of Cortisol, we developed an immuno-chromatographic biosensor system utilizing disposable test strips and an optical analyzer. To realize an immunochromatographic test strip for competitive and enzyme reactions, a glucose oxidase (GOD)-cortisol conjugate was newly synthesized. Moreover, a Cortisol biosensor system consisting of a disposable test strip (5×1.5×50 mm3) and a monitor was fabricated. Considering the error bar (SD) of reflectances, the Cortisol concentrations were distinguished by 0, 5, and 10 ng/ml. Thus, it was indicated that a three-scale semiquantitative analysis of Cortisol concentrations, such as low, middle, and high between 1 and 10 ng/ml, could be possible in the analysis. Our findings indicate the potential utility of the Cortisol biosensor for point-of-use measurements in hospitals.

Original languageEnglish
Pages (from-to)427-437
Number of pages11
JournalSensors and Materials
Issue number8
Publication statusPublished - 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • General Materials Science


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