In vitro: |
CHEMICAL & PHARMACEUTICAL BULLETIN, 2007, 55(1):15-18. | Triterpenoids from Hippophae rhamnoides L. and Their Nitric Oxide Production-Inhibitory and DPPH Radical-Scavenging Activities.[Reference: WebLink] | METHODS AND RESULTS:
In our investigation on the chemical constituents of Hippophae rhamnoides L., the chloroform-soluble fraction of the 80% acetone extract of branch bark was observed to inhibit nitric oxide (NO) production in a lipopolysaccharide and recombinant mouse interferon-gamma-activated murine macrophage-like cell line, RAW 264.7 cells. Two new triterpenoids, 2-O-trans-p-coumaroyl maslinic acid (1) and 2-O-caffeoyl maslinic acid (2), and three known triterpenoids, oleanolic acid (3), 3-O-trans-p-coumaroyl oleanolic acid (3-O-p-Coumaroyloleanolic acid, 4), and 3-O-caffeoyl oleanolic acid (5), and 6-methoxy-2H-1-benzopyran (6) and beta-sitosterol (7) were isolated from the branch bark extract.
CONCLUSIONS:
Their inhibitory activities on the production of NO in RAW 264.7 cells and radical-scavenging activities were examined. |
|