Grasas y Aceites, Vol 48, No 5 (1997)

Performance of polyunsaturated oils during frying of potatoes in fast food shops: Formation of new compounds and correlations between analytical methods.


https://doi.org/10.3989/gya.1997.v48.i5.803

L. Masson
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

P. Robert
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

N. Romero
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

M. Izaurieta
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

S. Valenzuela
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

J. Ortiz
Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile., Chile

M. C. Dobarganes
Instituto de la Grasa (CSIC), Spain

Abstract


In this study, different analytical methods, i.e. polar compounds, polar compound distribution, free fatty acids, peroxide value, conjugated dienes and trienes, oxidized fatty acids, viscosity and oxifrit-test, are applied to samples of both initial polyunsaturated oils and their counterparts after being used in the frying of potatoes in fast food shops. Two main objectives were established: the study of formation of new compounds during the frying process and the evaluation of possibilities to substitute complex methodologies for simpler and more rapid techniques. Results indicated that, although new compounds comming from oxidation and polymerization stand out, 20% of the samples contained very high amounts of hydrolytic products i.e. diglycerides and fatty acids, whose formation is difficult to explain. From the analysis of correlation coefficients between analytical methods, the utility of free fatty acids and conjugated dienes (or viscosity) to predict the amount of the main groups of new compounds in used polyunsaturated frying oils, was deduced.

Keywords


frying oil (quality); Polar compounds; Polyunsaturated oil; Potatoes; Rapid analytical method.

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Copyright (c) 1997 Consejo Superior de Investigaciones Científicas (CSIC)

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