Keywords
fats and oils
frying process
quality control
How to Cite
Abstract
The objectives were to determine the level of alteration of 58 fats and oils samples used from frying processes in commercial establishments, and to study the reliability of the following rapid tests: Perevalov assay, Oil Test, Fat Monitor 3M, and Solubility assay in Ketone-Methanol. To accomplish this study, some methodologies have been employed, such as: the determination of total polar compounds and the determination of free fatty acids. In a parallel comparative study, the rapid tests were carried out. Oil Test and Fat Monitor 3M assays purchased from the local market, and Perevalov assay and Solubility test in Ketone-Methanol were prepared in our laboratory. Among the 58 analyzed samples, 20.7% and 15.5%
resulted in concentrations of total polar compounds and of free fatty-acids, respectively, above the limits established for fats and oils for frying purposes. The rapid tests have shown the following rate of accurate results: 67.2% on Perevalov assay; 87.9% on Oil Test kit; 75.9% on Fat Monitor 3M assay; and 62.1% on Solubility assay, when compared with the limit established for total polar compounds. Oil Test demonstrated the best correlation coefficient regarding the total polar compounds (0.86%) , and it has also presented a minor occurrence...
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