The goal of this project was to investigate the feasibility of using alternative less-toxic assays of aldehydes in fry oil than the standard anisidine assay now being used. As boundary conditions, the assay had to be amenable to the analysis of bulk oil and be able to be carried out in a relatively short period of time so that the fry process could be changed. In the course of our investigations we found that a simple spot assay using purpald could be carried out in a quantitative fashion in less than 10 minutes and the results correlated nicely with measured anisidine values. The assay can use either fry oil directly without solvent or a 1:1 dilution in a small amount of organic solvent. We initially carried out the assay on standard silica gel TLC plates. However, other solid supports such as alumina TLC plates or paper can also be used. We also adapt a well known MBTH colorimetric assay used to determine aldehydic compounds in aqueous solutions to determination of AV values of fry oils in an organic solvent

Determination of carbonyl compounds in fry oils

247th National Meeting (2014)

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