Medicinal flowers (26) Structures of acylated oleanane-type triterpene oligoglycosides, yuchasaponins A, B, C, and D, from the flower buds of Camellia oleifera: gastroprotective, aldose reductase inhibitory, and radical scavenging effects

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  • Medicinal Flowers. XXVI. Structures of Acylated Oleanane-Type Triterpene Oligoglycosides, Yuchasaponins A, B, C, and D, from the Flower Buds of <i>Camellia oleifera</i>—Gastroprotective, Aldose Reductase Inhibitory, and Radical Scavenging Effects—
  • Medicinal flowers 26 Structures of acylated oleanane type triterpene oligoglycosides yuchasaponins A B C and D from the flower buds of Canellia oleifera gastroprotective aldose reductase inhibitory and radical scavenging effects
  • Medicinal Flowers. XXVI. Structures of Acylated Oleanane-Type Triterpene Oligoglycosides, Yuchasaponins A, B, C, and D, from the Flower Buds of <i>Camellia oleifera</i>&mdash;Gastroprotective, Aldose Reductase Inhibitory, and Radical Scavenging Effects&mdash;
  • Medicinal flowers. XXVI. Structures of acylated oleanane-type triterpene oligoglycosides, yuchasaponins A, B, C, and D, from the flower buds of Camellia oleifera-gastroprotective, aldose reductase inhibitory, and radical scavenging effects

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The methanolic extract and its 1-butanol-soluble fraction from the flower buds of Camellia oleifera ABEL were found to exhibit inhibitory effects on ethanol- and indomethacin-induced gastric mucosal lesions in rats. The ethyl acetate- and 1-butanol-soluble fractions also showed inhibitory effects on rat lens aldose reductase and scavenging effects on 1,1-diphenylpicryl-2-hydrazyl radical and superoxide. From the 1-butanol-soluble fraction, four new acylated oleanane-type triterpene oligoglycosides, yuchasaponins A, B, C, and D, were isolated and their structures were elucidated on the basis of chemical and physicochemical evidence. On the other hand, quercetin 3-O-α-L-rhamnopyranoside and kaempferol 3-O-α-L-rhamnopyranoside were isolated from the ethyl acetate- and 1-butanol-soluble fractions as the principal constituents, and their gastroprotective effects were examined.

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