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Highly Sensitive Fluorometric Acetone Biosensor Using Hemi-Ellipsoidal Mirror Optics for Efficient Light Collection.

Kenta Iitani1, Yuki Horiguchi2, Geng Zhang1

  • 1Laboratory for Biomaterials and Bioengineering, Institute of Integrated Research, Institute of Science Tokyo, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

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Summary
This summary is machine-generated.

This study introduces a novel hemi-ellipsoidal mirror for enhanced fluorescence detection in biosensors. This 3D-printable mirror significantly improves sensitivity for trace molecule detection, outperforming traditional fiber-optic systems.

Keywords:
NADHacetoneenzymatic biosensorfluorescencegeometrical optics

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Area of Science:

  • Optical Engineering
  • Biosensor Technology
  • Analytical Chemistry

Background:

  • Fiber-optic systems are standard for fluorometric biosensors but suffer from limited light-collection efficiency.
  • This limitation hinders the detection of trace molecules, crucial for applications like transcutaneous acetone sensing.
  • A need exists for improved optical designs to enhance fluorescence detection sensitivity.

Purpose of the Study:

  • To develop and evaluate a novel fluorescence light-collection approach using a hemi-ellipsoidal mirror.
  • To assess the performance of this system for quantifying nicotinamide adenine dinucleotide (NADH) and detecting acetone.
  • To demonstrate the potential of this easily fabricable system as a replacement for conventional fiber-optic biosensors.

Main Methods:

  • Fabrication of a hemi-ellipsoidal mirror using stereolithography-based 3D printing and mirror-finish spray paint.
  • Construction of a fluorometric biosensor system with the mirror, flow cell, and photomultiplier tube (PMT) at elliptical foci.
  • Quantification of NADH and real-time monitoring of acetone reduction using secondary alcohol dehydrogenase (S-ADH) and fluorescence measurements.

Main Results:

  • The hemi-ellipsoidal mirror system achieved a limit of quantification for NADH nine times lower than conventional fiber-optic systems.
  • Real-time acetone monitoring demonstrated a dynamic range 14 times more sensitive than fiber-optic methods.
  • The system enabled highly sensitive fluorescence detection with potential for transcutaneous acetone gas sensing.

Conclusions:

  • The easily fabricable hemi-ellipsoidal mirror significantly enhances fluorescence light collection and detection sensitivity.
  • This approach offers a promising alternative to fiber-optic systems for various fluorometric biosensor applications.
  • The developed system shows strong potential for sensitive transcutaneous acetone gas sensing.