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가열산화가 냉압착 들기름의 품질특성에 미치는 영향

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

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참고문헌

주제분류식품과학

초록

냉압착 들기름과 볶음 압착 들기름 및 볶음 가열 압착 들기름의 가열산화에 의한 색도 및 갈변도, 총 페놀 함량, 과산화물가, 산가, 이중공액산가, 전자공여능 및 지방산 함량 변화를 측정하여 각 들기름의 특성 및 가열산화에 의한 품질을 비교하였다. 냉압착 들기름은 Hunter L 값은 76.62로서 볶음 압착 들기름의 39.77에 비하여 2배 이상 높게 나타났으며, 갈색도의 경우에도 각각 0.027과 0.244을 나타내어 냉압착유의 갈색화 정도가 낮은 것으로 나타났다. 산가와 이중공액산가는 냉압착 들기름이 가장 낮은 값을 나타내었고, 총 페놀 함량의 경우 볶음 압착 들기름이 7.27 mg/100 g oil로 냉압착 들기름에 비하여 1.60배 이상인 것으로 나타났으며, 전자공여능도 볶음 압착 들기름이 냉압착 들기름에 비하여 높게 나타내었다. 지방산 함량의 경우에도 냉압착 들기름의 oleic acid와 linoleic acid 함량이 가장 높았으며 포화지방산에 대한 불포화지방산의 비율이 12.10으로 가장 높게 나타났다. 또한 가열산화 처리에 의해 들기름의 Hunter L 값, 산가, 이중 공액산가 및 과산화물가는 증가하는 경향을 나타낸 반면, Hunter a 및 b 값, 갈변도, 총 페놀 함량은 감소하는 경향을 나타내었다.

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.

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