Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Antioxidative Activity of Barley Polyphenol Extract (BPE) Separated from Pearling By-products

도정부산물로부터 분리한 보리 폴리페놀 추출물의 항산화 효과

  • Published : 2002.10.01
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Abstract

Barley bran and germ fractions were collected during pearling process. Barley polyphenol extract (BPE) was separated from the pearling fractions, and its antioxidative activity was determined through linoleic acid model system and lipid autoxidation model using corn oil as a substrate. At 0.02% addition level, thiobarbituric acid (TBA) value of BPE from bran fraction III appeared to be similar to that of ${\alpha}-tocopherol$, and bran fraction I and germ extract exhibited similar antioxidative activities to that of BHT. Peroxide value was measured to estimate antioxidative activity of BPE upon lipid autoxidation. As BPE concentration increased, higher antioxidative activity was observed compared to ${\alpha}-tocopherol$ and BHT until 10-15 day storage, whereas no effect was shown after 20-day storage. Relative antioxidant effectiveness (RAE) of $0.02{\sim}0.1%$ BPE from bran fraction I and germ were $128{\sim}135$ and $126{\sim}133$, respectively, and appeared to be higher than that of BHT (126), suggesting that these BPE fractions could be used as natural antioxidants.

보리 도정부산물은 맥강과 배아 획분으로부터 항상화 효능과 높은 상관관계가 있는 폴리페놀성 물질(barley polyphenol extract: BPE)을 분리하고 이들 획분을 linoleic acid를 사용한 모델계와 옥배유를 기질로 한 유지의 자동산화를 통하여 이들의 항산화 효과를 검토하였다. TBA가 측정결과 bran III의 BPE는 ${\alpha}-tocopherol$과 유사한 값을 나타내었고, 다른 획분 특히 bran I과 배아 획분의 경우는 합성 항산화제인 BHT와 유사한 것으로 나타났다. 유지의 자동산화에 대한 BPE의 항산화효과를 과산화물가를 이용하여 측정한 결과 저장 초기 10일에서 15일 까지는 첨가 농도가 높아짐에 따라 ${\alpha}-tocopherol$ 및 BHT와 유사하거나 다소 높은 항산화력을 나타내었으나 저장 20일 이후부터는 첨가농도에 따른 차이는 보이지 않았다. 또한 $40\;meq/kg{\cdot}oil$에 도달하는 기간을 유도기간으로 정하고 유도기간에 따른 상대적 항산화효과(RAE)를 측정한 결과 bran I과 배아 획분의 BPE를 0.02% 첨가시 RAE값은 각각 128 및 126이었고 0.1% 첨가시에는 135 및 133으로서 첨가량의 변화에 따른 차이는 나타나지 않았으나 BHT의 126보다 높게 측정되어 이들 획분은 향후 천연 항산화제로서의 가능성이 시사되었다.

Keywords

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