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http://dx.doi.org/10.9721/KJFST.2011.43.2.149

Antioxidant Activity of Ripe Fruit Components of Rubus coreanus: Extraction Using Porous Polymer Resins  

Choi, Se-Jin (Department of Food Science and Nutrition, Hallym University)
Lee, Yeon-Sil (Center for Efficacy Assessment and Development of Functional Foods and Drugs, Hallym University)
Kim, Jin-Kyu (Institute of Natural Medicine, Hallym University)
Chung, Cha-Kwon (Department of Food Science and Nutrition, Hallym University)
Kang, Il-Jun (Department of Food Science and Nutrition, Hallym University)
Lim, Soon-Sung (Department of Food Science and Nutrition, Hallym University)
Publication Information
Korean Journal of Food Science and Technology / v.43, no.2, 2011 , pp. 149-155 More about this Journal
Abstract
This study was carried out to develop a method of removing unnecessary sugars and high-molecular weight soluble components from water extract by using various highly porous polymer resins: these resins are widely used as adsorbents for polyphenolic compounds. Each anthocyanin-rich fraction (ARF) that was eluted from column packed with 4 different resins (SEPABEADS SP207, 700, 850 and Diaion HP 20) was obtained from an aqueous extract of the ripe fruits of Rubus coreanus, which is well-known in Korea as "Bok-bun-ja". Among the above mentioned resins, Diaion HP20 had the highest efficacy and provided maximum yield of the ARF. The ARF eluted from the column packed with HP 20 exhibited the strongest antioxidant activity in vitro. Bioactive phytochemicals extracted from Rubus coreanus were investigated using the on-line HPLC-$ABTS^{{\cdot}+}$ system, and the resulting 6 peaks were identified as radical-scavenging components. By using liquid chromatography-mass spectrometry, 5 peaks were obtained, and these were identified as cyanidin-3-sambubioside, cyanidin-3-glucoside, cyanidin-3-xylosylrutinoside, cyanidin-3-rutinoside and pelargonidin-3-rutinoside. These results indicate that the use of appropriate porous resin (Diaion HP 20) leads to an increase in the yield of bioactive components and enhancement of their biological properties.
Keywords
Rubus coreanus; highly porous polymer resin; anthocyanin; antioxidant; on-line bioassay;
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