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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Biofluorometric Acetone Gas Sensor of Sub-ppbv Level Sensitivity.

Kenta Iitani1, Naohiro Ishizuki2, Yuka Matsuhashi1

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

Analytical Chemistry
|December 13, 2024
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Summary
This summary is machine-generated.

This study enhanced a wearable acetone gas sensor for early diabetes mellitus screening. The improved bio-sniffer offers significantly better sensitivity for detecting trace acetone in skin gas.

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Medical Diagnostics

Background:

  • Acetone gas in breath and skin indicates fatty acid metabolism, relevant to diabetes mellitus.
  • Early diabetes screening requires sensitive, continuous measurement of acetone gas.
  • Wearable sensors for skin acetone detection are increasingly needed.

Purpose of the Study:

  • To improve the sensitivity of a biofluorometric acetone gas sensor (bio-sniffer).
  • To enable wearable, continuous monitoring of trace acetone concentrations in skin gas for diabetes screening.

Main Methods:

  • Optimized fluorescence measurement system and flow cell of a secondary alcohol dehydrogenase-based bio-sniffer.
  • Developed a dilution system for preparing sub-parts per billion by volume (ppbv) acetone gas standards.
  • Verified dilution system accuracy using gas chromatography-mass spectrometry.

Main Results:

  • The dilution system accurately prepared acetone gas down to 0.1 ppbv with 5% coefficient of variation.
  • The improved bio-sniffer quantified acetone in the 0.5-1000 ppbv range.
  • Achieved a lower limit of quantification 40 times better than the conventional sensor.

Conclusions:

  • The optimized acetone bio-sniffer shows enhanced sensitivity for detecting trace acetone.
  • This improved sensor system holds promise for continuous, wearable monitoring of skin acetone for early diabetes detection.