반건조 장어에 대한 식물 주정 추출물의 항산화 효과 = Antioxidant effects of ethanol extracts from plants on semi-dried eels

다국어 초록 (Multilingual Abstract)

Ethanol extracts from Ginger, cinnamon, dried onions, and Hutgae (Hovenia dulcis Thunb.) trunk were pre-treated on the eels to find out their peroxidation preventing properties on the eels. The eels were evenly coated with the extract equivalent to 2% of their total weight and dried for 15 h at 35℃ using an air blower. Antioxidative properties of ethanol extracts were reviewed through the DPPH scavenging effect, and the acid value, peroxide value, and linoleic acid value of the semi-dried eels, and also the delayed reaction of peroxidation of semi-dried eel oil. The highest level of DPPH scavenging was cinnamon extract, followed by Hutgae trunk extract, dried onions, and ginger (p<0.05). Regarding acid value of eels refrigerated for 21 days, ginger extract recorded the lowest. As in the preventative effect of free fatty acid, ginger extract prevented the early hydroperoxide during the drying process of eels. During the 20 days of peroxide-induced-reaction period, the most effective preventer of linoleic acid peroxide was Hutgae trunk extract and ginger and dried onion extracts were followed. During the 20 days of peroxide-induced-reaction period, the effective peroxidation preventers of semi-dried eel oil were ginger, cinnamon, and dried onions extracts. Hutgae trunk extract was found to delay effectively the peroxidation induction period of eel oil. In conclusion, pre-application of ethanol extracts from ginger and cinnamon was effective in delaying peroxidation of eels in the drying process and of semi-dried eels in refrigeration, and extracts from dried onions and Hutgae trunk were stalling the induced peroxidation and restricting peroxide content to some degrees.

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