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Relationship between antioxidant components and oxidative stability of peanut oils as affected by roasting temperatures
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  • Kai–Min Yang,
  • Jhih–Ying Ciou,
  • Hsin –Chun Chen,
  • GiGi Chin–Wen Lim ,
  • Chih-Wei Chen
Kai–Min Yang
MingDao University
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Jhih–Ying Ciou
Tunghai University
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Hsin –Chun Chen
China Medical University
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GiGi Chin–Wen Lim
MingDao University
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Chih-Wei Chen
Chang Jung Christian University
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Abstract

The study sought to investigate the effect of roasting temperatures on antioxidant components and oxidative stability of peanut oils. The total phenolic content, total flavonoid content, α–tocopherol content, and phytosterol content in peanut oils was influenced by roasting at temperatures of 120℃, 140℃, and 160℃, while those roasting temperatures had no effect on the fatty acid profile and γ–tocopherol content of peanut oils. Roasting promotes the quality of peanut oil aroma via the Maillard reaction, particularly those derived from N–heterocyclic compounds (such as pyrazine and pyrrole). The oxidative stability of peanut oils was investigated using the Rancimat method, and the results show that there is a linear relationship between roasting and natural logarithm of induction period (R2: 0.959~0.998). This was determined based on the Arrhenius equation, which indicated the activation energy (Ea) were 82.08~108.61 KJ/mol. In PCA analysis, the antioxidant stability of the increase levels of phenols released in the peanut oils was found to be rise with increment of roasting temperatures. The data obtained in this study should be confirmed to the nutritional benefits of peanut oils that will be most appealing to consumers.