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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Sol-gel based sensor for selective formaldehyde determination.

Opas Bunkoed1, Frank Davis, Proespichaya Kanatharana

  • 1Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand.

Analytica Chimica Acta
|January 28, 2010
PubMed
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This study introduces a new method for detecting formaldehyde using transparent sol-gels. The technique offers sensitive, selective, and reproducible detection of formaldehyde in indoor air.

Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Formaldehyde is a common indoor air pollutant with significant health implications.
  • Existing detection methods can be complex or lack sensitivity for low concentrations.

Purpose of the Study:

  • To develop a novel, sensitive, and selective method for formaldehyde detection.
  • To create a transparent sol-gel matrix for direct formaldehyde analysis.
  • To enable both visual screening and spectrophotometric quantification of formaldehyde.

Main Methods:

  • Utilizing transparent sol-gels with entrapped beta-diketones (e.g., acetylacetone).
  • Adsorption of airborne formaldehyde followed by in-situ reaction to form a detectable yellow product (lutidine).
  • Direct detection and quantification via visual inspection or spectrophotometry without sample preparation.

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

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Published on: February 16, 2018

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Main Results:

  • Achieved a low detection limit of 0.03 ppmv for formaldehyde.
  • Demonstrated good reproducibility with relative standard deviations of 6.3% and 4.6% at 0.2 and 1 ppmv, respectively.
  • Confirmed no interference from other common carbonyl compounds like acetaldehyde and acetone.

Conclusions:

  • The developed sol-gel method provides a simple, rapid, and effective means for formaldehyde detection in indoor air.
  • The method's sensitivity surpasses recommended exposure limits by WHO and OSHA.
  • This approach facilitates both qualitative screening and quantitative analysis of formaldehyde pollution.