Flavonoids from artocarpus anisophyllus and their bioactivities
Two new prenylated flavonoids, 4',5-dihydroxy-6,7-(2,2-dimethylpyrano)-2'-methoxy-8-y,y-dimethylallylflavone 1 and 3'-hydroxycycloartocarpin 2 along with six known flavonoids, 5,7-dihydroxy-4'-methoxy-8-prenylflavanone 3, isobavachalcone 4, pyranocycloartobiloxanthone A 5, artoca...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Published: |
Natural Product Incorporation
2015
|
| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/55311/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Universiti Teknologi Malaysia |
| Summary: | Two new prenylated flavonoids, 4',5-dihydroxy-6,7-(2,2-dimethylpyrano)-2'-methoxy-8-y,y-dimethylallylflavone 1 and 3'-hydroxycycloartocarpin 2 along with six known flavonoids, 5,7-dihydroxy-4'-methoxy-8-prenylflavanone 3, isobavachalcone 4, pyranocycloartobiloxanthone A 5, artocarpin 6, chaplashin 7 and cycloartocarpin 8 were isolated for the first time from the leaves and the heartwoods of Artocarpus anisophyllus Miq. The structures of isolated flavonoids were elucidated spectroscopically using 1D and 2D NMR, FTIR, MS, UV and also by comparison with literature data. These flavonoids were screened for their antioxidant and tyrosinase inhibitory activities. The dichloromethane and ethyl acetate crude extracts together with 3'-hydroxycycloartocarpin 2, pyranocycloartobiloxanthone A 5 and artocarpin 6 showed DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity with SC50 values of 80.2, 40.0, 152.9, 20.2 and 140.0 µg/mL in 30 min, respectively. Pyranocycloartobiloxanthone A 5 exhibited significant tyrosinase inhibitory activity against tyrosinase from mushroom with IC50 values of 60.5 µg/mL. |
|---|