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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Microdevice for on-site fish freshness checking based on K-value measurement.

Daisuke Itoh1, Eri Koyachi, Masatoshi Yokokawa

  • 1Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 Japan.

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A novel electrochemical microfluidic device accurately measures fish freshness by quantifying adenosine triphosphate (ATP)-related compounds. This method provides reliable K-value measurements comparable to HPLC, aiding in seafood quality assessment.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Food Science

Background:

  • Assessing fish freshness is crucial for food safety and quality control.
  • Traditional methods for determining fish freshness, like High-Performance Liquid Chromatography (HPLC), can be time-consuming and require specialized equipment.
  • The K-value, derived from adenosine triphosphate (ATP)-related compounds, is a key indicator of fish spoilage.

Purpose of the Study:

  • To develop and validate an electrochemical microfluidic device for rapid and accurate K-value measurement.
  • To evaluate the device's performance in assessing the freshness of various fish species.
  • To compare the device's K-value results with those obtained by conventional HPLC methods.

Main Methods:

  • Fabrication of a microfluidic device featuring two sensing sites for electrochemical measurements.
  • Utilizing plug-based flow control for precise sample handling, merging, and mixing within the microchannel.
  • Measuring the electrochemical signals corresponding to ATP-related compounds at sequential sensing sites for K-value calculation.

Main Results:

  • The device demonstrated a strong correlation between the ratio of output currents and the K-value determined from standard solutions.
  • K-value measurements for jack mackerel, yellow tail, and sea bream extracts using the microfluidic device showed excellent agreement with HPLC results.
  • The study observed distinct temporal changes in K-values for different fish species, highlighting species-specific spoilage kinetics.

Conclusions:

  • The developed electrochemical microfluidic device offers a viable, rapid, and accurate alternative for K-value determination and fish freshness assessment.
  • The device's ability to provide results comparable to HPLC enhances its potential for practical application in the seafood industry.
  • Understanding species-specific spoilage rates through K-value monitoring can improve seafood quality management and reduce waste.