Absolute Stereostructures of Three New Sesquiterpenes from the Fruit of Alpinia oxyphylla with Inhibitory Effects on Nitric Oxide Production and Degranulation in RBL-2H3 Cells
摘要:
The 80% aqueous acetone extract and the ethyl acetate-soluble portion from the dried fruit of Alpinia oxyphylla MIQUEL Were found to show inhibitory effects on nitric oxide production in lipopolysaccharide-activated activated macrophages and antigen-induced degranulation in RBL-2H3 cells. A new eudesmane-type sesquiterpene, oxyphyllol A, and two eremophilane-type sesquiterpenes, oxyphyllols B and C, were isolated from the ethyl acetate-soluble portion, together with 16 known constituents. The absolute stereostructures of oxyphyllols A, B, and C were determined on the basis of chemical and physicochemical evidence. The effects of isolated component on nitric oxide production were examined, and nine constituents including oxyphyllol A and nootkatone were found to show inhibitory activity. On the other hand, five constituents inhibited the release of beta-hexosaminidase from RBL-2H3 cells.
Absolute Stereostructures of Three New Sesquiterpenes from the Fruit of <i>Alpinia </i><i>o</i><i>xyphylla</i> with Inhibitory Effects on Nitric Oxide Production and Degranulation in RBL-2H3 Cells
The 80% aqueous acetone extract and the ethyl acetate-soluble portion from the dried fruit of Alpinia oxyphylla MIQUEL Were found to show inhibitory effects on nitric oxide production in lipopolysaccharide-activated activated macrophages and antigen-induced degranulation in RBL-2H3 cells. A new eudesmane-type sesquiterpene, oxyphyllol A, and two eremophilane-type sesquiterpenes, oxyphyllols B and C, were isolated from the ethyl acetate-soluble portion, together with 16 known constituents. The absolute stereostructures of oxyphyllols A, B, and C were determined on the basis of chemical and physicochemical evidence. The effects of isolated component on nitric oxide production were examined, and nine constituents including oxyphyllol A and nootkatone were found to show inhibitory activity. On the other hand, five constituents inhibited the release of beta-hexosaminidase from RBL-2H3 cells.