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Antibacterial and antioxidant activities of quercetin oxidation products from yellow onion (Allium cepa) skin.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ramos, Freddy A. Takaishi, Yoshihisa Shirotori, Miki Kawaguchi, Yousuke Tsuchiya, Koichiro Shibata, Hirofumi Higuti, Tomihiko Tadokoro, Tetsuo Takeuchi, Minoru |
| Copyright Year | 2006 |
| Abstract | Four new quercetin-derived oxidation products (1-4) and lunularin-4-O-beta-D-glucoside (5) were isolated from a water extract of onion (Allium cepa) skin, together with 17 other known compounds. Antibacterial assays for the isolated compounds showed that 2-(3,4-dihydroxyphenyl)-4,6-dihydroxy-2-methoxybenzofuran-3-one (1) presented selective activity against Helicobacter pylori strains and 3-(quercetin-8-yl)-2,3-epoxyflavanone (4) showed antibacterial activity against MRSA and H. pylori strains at the same time that it increased susceptibility of MRSA to beta-lactams. Evaluation of antioxidant activity against DPPH for the isolated compounds showed that the new derivative compounds (1-4) and 2,5,7,3',4'-pentahydroxy-3,4-flavandione (6) are more active than quercetin. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/jf060251c |
| PubMed reference number | 19127724 |
| Journal | Medline |
| Volume Number | 54 |
| Issue Number | 10 |
| Alternate Webpage(s) | http://www.taihoinc.co.jp/onion-2006.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/jf060251c |
| Journal | Journal of agricultural and food chemistry |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
