Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/73495
Type: Artigo de periódico
Title: The influence of natural tocopherols during thermal oxidation of refined and partially hydrogenated soybean oils
Author: Steel, CJ
Dobarganes, MC
Barrera-Arellano, D
Abstract: Samples of refined and partially hydrogenated soybean oils, with iodine values between 60 and 130, tocopherol-stripped or not by aluminium oxide treatment, were submitted to thermal oxidation, at 180 degrees C for 10 hours. Samples were collected at 0, 2, 5, 8 and 10 hours,for the determination of dimers and polymers (degradation compounds) and tocopherols. The relation of iodine value to the formation of dimers and polymers and the role of originally present tocopherols in the protection of fats and oils against thermal degradation was verified. The degradation curves for tocopherols showed that alpha and gamma-tocopherols were destroyed faster than beta and delta-tocopherols. In addition, the degradation rate of tocopherols was greater in the more saturated fats. The formation of dimers and polymers was greater in the oil than in the hydrogenated samples and in the samples treated with aluminium oxide with respect to the original, untreated samples.
Subject: hydrogenated fats
oils
soybean
thermal degradation
thermal oxidation
tocophero
Country: Espanha
Editor: Inst Grasa Sus Derivados
Rights: fechado
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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