A comparative study on the deterioration of oils by microwave and conventional heating

Radwan S. Parag; Fawzy M. Hewedi; Salah H. Abo-Raya; Gamal S. A. El-Baroty

doi:10.3989/gya.1991.v42.i3.1243

A comparative study on the deterioration of oils by microwave and conventional heating

Authors

Radwan S. Parag Biochemistry Department, Faculty of Agriculture, Cairo University
Fawzy M. Hewedi Biochemistry Department, Faculty of Agriculture, Cairo University
Salah H. Abo-Raya Food Science and Technology Department, Faculty of Agriculture, Cairo University
Gamal S. A. El-Baroty Biochemistry Department, Faculty of Agriculture, Cairo University

DOI:

https://doi.org/10.3989/gya.1991.v42.i3.1243

Keywords:

Comparative study, Conventional heating Cottonseed oil, Hydrogenated palm oil, Microwave heating, Thermooxidative alteration

Abstract

Refined cottonseed oil and hydrogenated palm oil were heated by two methods, i.e., conventionally by gas-cooker and microwaves. Quality assurance methods such as refractive index, color, diene content, acid value, peroxide value, TBA value, iodine value, petroleum ether insoluble oxidized fatty acid content and degree of polymerization were determined. Exposing the oil samples to various heating times and microwave oven power caused some hydrolysis to free fatty acids, accelerated the formation of hydroperoxides and secondary oxidation products. The values from each test increased with both the power settings of microware oven and time of heating. In general, the development of rancidity for refined cottonseed oil heated by microwaves was twice faster than that produced by conventional heating. Also, the chemical values for refined cottonseed oil were much higher than that of hydrogenated palm oil in all cases.

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Published

1991-06-30

How to Cite

Parag RS, Hewedi FM, Abo-Raya SH, El-Baroty GSA. A comparative study on the deterioration of oils by microwave and conventional heating. Grasas aceites [Internet]. 1991Jun.30 [cited 2026Jul.28];42(3):187-93. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/1243

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Issue

Vol. 42 No. 3 (1991)

Section

Research

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