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Influence of Thermal Treatment on Chemical Changes in Cold-Pressed Perilla Seed Oil  

Cho, Young-Sim (Korea Food Research Institute)
Kim, Bum-Keun (Korea Food Research Institute)
Park, Jai-Kee (Korea Food Research Institute)
Jeong, Jin-Woong (Korea Food Research Institute)
Jeong, Seung-Weon (Korea Food Research Institute)
Lim, Jeong-Ho (Korea Food Research Institute)
Publication Information
Food Science and Preservation / v.16, no.6, 2009 , pp. 884-892 More about this Journal
Abstract
We determined the chemical changes occurring in oil after exposure to high temperatures for various periods of time. Alterations in the chemical parameters of oil after heating for 30, 60, 90, and 120 min at 120C were investigated. The study involved cold-pressed perilla oil (CPPO), virgin perilla oil (VPO), and commercial heat press-extracted perilla oil (CHPEPO), and we assessed quality properties such as Hunter's color values, browning color intensity, acid value, conjugated dienoic acid level, peroxide value, total phenolic content, electron-donating ability, and fatty acid concentration. Hunter L values were higher for CPPO than for VPO or CHPEPO, whereas browning color intensity was greatest for CHPEPO. Peroxide value data showed higher levels of oxidation products in CPPO than in VPO or CHPEPO, whereas conjugated dienoic acid level was most increased in CHPEPO. The content of total phenolics and electron-donating ability were higher in CHPEPO than in CPPO or VPO. After thermal treatment, fatty acid content was most altered in CPPO; in particular, the level of polyunsaturated fatty acids dropped significantly. Hunter L value, acid value, conjugated dienoic acid level, and peroxide concentration also increased whereas Hunter a and b values, browning color intensity, and total phenolic content were decreased in perilla seed oils after thermal oxidation treatment.
Keywords
cold-pressed; perilla oil; thermal oxidation; phenolics; fatty acid;
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