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Title: A new formaldehyde optical sensor: detecting milk adulteration
Author: Veríssimo, Marta I. S.
Fernandes, António J. S.
Evtuguin, Dmitry V.
Gomes, M. Teresa S. R.
Gamelas, José A.F.
Keywords: Formaldehyde
Food adulteration
Optical fibre sensor
Acetylacetone method
Issue Date: 15-Jul-2020
Publisher: Elsevier
Abstract: A sensor consisting of an optical fibre with the exposed tip coated with the polyoxometalate salt [(C4H9)4N]4H[PMo10V2O40], specially designed to be insoluble in water, which UV-Vis spectrum changed in contact with formaldehyde, is presented. The sensor limit of detection for formaldehyde was 0.2 mg L-1, and the limit of quantification was 0.6 mg L-1, which were close to the conventional spectrophotometric method values of 0.2 mg L-1 and 0.5 mg L-1, respectively, and lower than the tolerable limit for ingested food. The sensor was tested for formaldehyde quantification in milk, as its deliberate addition is a matter of concern. The results obtained analysing formaldehyde in milk samples by the optical sensor and by the conventional method were not statistically different (α = 0.05).
Peer review: yes
DOI: 10.1016/j.foodchem.2020.126461
ISSN: 0308-8146
Appears in Collections:CESAM - Artigos
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