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Antioxidative and Biological Activites of Extracts of Sweetpotato Tips  

Lee, Joon-Seol (Mokpo Experiment Station, National Institute of Crop Science, RDA)
Park, Yang-Kyun (Department of Food Engineering and Food Industrial Technology Research Center, Mokpo National University)
Ahn, Young-Sup (National Institute of Crop Science, RDA,)
Kim, Hag-Sin (Honam Agricultural Research Institute, NICS)
Chung, Mi-Nam (Rural Development Administration)
Jeong, Byeong-Choon (Mokpo Experiment Station, National Institute of Crop Science, RDA)
Bang, Jin-Ki (Mokpo Experiment Station, National Institute of Crop Science, RDA)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.52, no.2, 2007 , pp. 228-238 More about this Journal
Abstract
This study was conducted to increase sweetpotato utilization and to determine the vegetative value of sweetpotato tips by investigating the phenolic compounds, antioxidative effect in oil, electron donating ability, nitrite scavenging effect and ACE inhibition activities. The phenolic compounds present in sweetpotato tips are the gallic, chlorogenic, gentisic, caffeic, couramic and ferulic acid, which are 16-122 times higher compared to other vegetables such as spinach, soybean sprout, and perilla leaves. In each solvent extract, the total phenolic compounds (175.8mg/g) was composed of 55% EtOAc extraction and 39% BuOH extract, respectively. The results of induction period using the Rancimat method showed that the antioxidant activity of SP tips was higher than the tocopherol or BHT. The relative levels of each solvent extract in SP tips were as follows: EtOAc>BHT>BuOH>Tocopherol>Water>$CHCl_3$>Hexane. The peroxide value was measured every 5 days for 25 days during storage and results showed that the peroxide value, the tips, tuberous root and tocopherol were lower compared to spinach, soybean sprout and perilla leaves. Nitrite scavenging effects were excellent in sweetpotato tips, perilla leaves and soybean sprout, especially, inhibition rate of perilla leaves (72%) were superior to the others. In process of solvent extraction, activity of BuOH and water extractions were the best. ACE inhibition activity in sweetpotato tips was 1.5 times higher than in tuberous roots and $1.9{\sim}3.7$ times higher than in spinach, soybean sprout, perilla leaves.
Keywords
sweetpotato; tips; phenolics; antioxidative activites; Biological activites;
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