In vitro: |
Food Sci. Biotechnol., 2011, 20(2):555-60. | Isolation and identification of cinnamic acid amides as antioxidants from Allium fistulosum L. and their free radical scavenging activity[Reference: WebLink] | METHODS AND RESULTS: Four compounds obtained from the ethyl acetate-soluble neutral fraction of methanol extracts of the Welsh onion ( Allium fistulosum L.) were purified by column chromatography using silica gel, octadecyl silane (ODS), and Sephadex LH-20 with a guided DPPH radical scavenging assay. After purification, the compounds were isolated by ODS- HPLC . The isolated compounds were identified as
N-trans -feruloyl-3′-methoxytyramine ( 1 ), N-cis -feruloyl-3′-methoxytyramine ( 2 ), N-trans-p -coumaroyltyramine ( 3 ), and 3,5,7-trihydroxyflavone (kaempferol, 4 ) based on the spectroscopic data of NMR and MS. To the best of our knowledge, this is the first study to identify compound 1–3 in the Welsh onion.
CONCLUSIONS:
Compound 1 and 2 showed significantly ( p <0.05) higher DPPH radical scavenging activities than compound 3 . |
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