A new formaldehyde optical sensor: Detecting milk adulteration
authors Verissimo, MIS; Gamelas, JAF; Fernandes, AJS; Evtuguin, DV; Gomes, MTSR
nationality International
journal FOOD CHEMISTRY
author keywords Formaldehyde; Milk; Food adulteration; Optical fibre sensor; Polyoxometalate; Acetylacetone method
keywords POLYOXOMETALATE; FOOD; FRAUD; FILM
abstract A sensor consisting of an optical fibre with the exposed tip coated with the polyoxometalate salt [(C4H9)(4)N](4)H [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 (alpha = 0.05).
publisher ELSEVIER SCI LTD
issn 0308-8146
year published 2020
volume 318
digital object identifier (doi) 10.1016/j.foodchem.2020.126461
web of science category Chemistry, Applied; Food Science & Technology; Nutrition & Dietetics
subject category Chemistry; Food Science & Technology; Nutrition & Dietetics
unique article identifier WOS:000520858000004
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journal analysis (jcr 2019):
journal impact factor 6.306
5 year journal impact factor 6.219
category normalized journal impact factor percentile 93.01
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