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A new formaldehyde optical sensor: Detecting milk adulteration.

Marta I S Veríssimo1, José A F Gamelas2, António J S Fernandes3

  • 1CESAM, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

Food Chemistry
|March 7, 2020
PubMed
Summary
This summary is machine-generated.

A novel optical fiber sensor detects formaldehyde in food and beverages. This new sensor is water-insoluble and accurately quantifies formaldehyde, ensuring food safety.

Keywords:
Acetylacetone methodFood adulterationFormaldehydeMilkOptical fibre sensorPolyoxometalate

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Food Science

Background:

  • Formaldehyde is a food contaminant of concern due to its toxicity.
  • Accurate detection of formaldehyde is crucial for food safety regulations.
  • Existing detection methods may have limitations in sensitivity or applicability.

Purpose of the Study:

  • To develop and validate a novel optical fiber sensor for formaldehyde detection.
  • To assess the sensor's performance, including its limit of detection and quantification.
  • To evaluate the sensor's applicability for formaldehyde analysis in milk samples.

Main Methods:

  • Fabrication of an optical fiber sensor coated with a water-insoluble polyoxometalate salt, [(C4H9)4N]4H[PMo10V2O40].
  • Characterization of the sensor's response to formaldehyde using UV-Vis spectroscopy.
  • Determination of the sensor's limit of detection (LOD) and limit of quantification (LOQ).
  • Validation of the sensor by analyzing formaldehyde in spiked milk samples and comparing results with a conventional spectrophotometric method.

Main Results:

  • The optical fiber sensor exhibited a change in its UV-Vis spectrum upon contact with formaldehyde.
  • The sensor achieved an LOD of 0.2 mg L⁻¹ and an LOQ of 0.6 mg L⁻¹, comparable to conventional methods.
  • Results from formaldehyde analysis in milk samples using the optical sensor were statistically similar to those obtained by the spectrophotometric method (α = 0.05).

Conclusions:

  • The developed optical fiber sensor is a viable tool for sensitive and accurate formaldehyde detection.
  • The sensor's water-insolubility and performance characteristics make it suitable for food safety applications.
  • The sensor provides reliable formaldehyde quantification in complex matrices like milk, contributing to enhanced food quality control.