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Antioxidant Effects of the Methanol Extracts Obtained from Aerial Part and Rhizomes of Ferns Native to Korea  

Shin, So-Lim (Dept. of Horticultural Science, Chungbuk Nat'l Univ.)
Lee, Cheol-Hee (Dept. of Horticultural Science, Chungbuk Nat'l Univ.)
Publication Information
Korean Journal of Plant Resources / v.23, no.1, 2010 , pp. 38-46 More about this Journal
Abstract
Phenolic compound contents and scavenging activity on DPPH and ABTS radicals in twelve fern species were studied by analysing ultrasonification extraction of dried aerial parts and rhizomes using methanol solvent. Total polyphenol content ranged from 2.97 to 140.1 mg per 1 g dried sample and 0.80 to $49.58\;mg{\cdot}g^{-1}$ fresh sample. Highest polyphenol content was obtained with aerial part of Davallia mariesii and Polystichum lepidocaulon. Total flavonoid content of dried sample was $2.56{\sim}34.91\;mg{\cdot}g^{-1}$ and fresh sample $0.71{\sim}11.49\;mg{\cdot}g^{-1}$. Higher flavonoids were obtained with dried aerial part of Dryopteris crassirhizoma, but with fresh aerial part of P. lepidocaulon. In general, total polyphenol content was higher in rhizomes, except in case of total flavonoid. Scavenging effects on DPPH and ABTS radicals was higher with rhizome extracts compared to aerial parts. The rhizome of Polystichum polyblepharum showed highest effects on both radicals. However, the amount of fresh sample for $RC_{50}$ with consideration of water content and extraction yield. P. lepidocaulon aerial part was more advantageous than P. polyblepharum rhizome. All the fern extracts except for the Coniogramme japonica extract demonstrated superior scavenging effects on ABTS radicals, being similar activity of ascorbic acid and BHT.
Keywords
ABTS radical; DPPH radical; polyphenol; flavonoid; sonication; ultrasonic wave;
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