Steroidal saponins and phenylic constituents from Lilium lancifolium and their anti-oxidant activities / 中草药

ABSTRACT

Objective: To study the steroidal saponins and phenylic constituents in the bulbs of Lilium lancifolium and their anti-oxidant activities in vitro. Methods: The constituents were isolated and purified by chromatographic technique and recrystallization, and their structures were identified by spectral methods together with physiochemical analyses. The anti-oxidant effects of these constituents on DPPH and ABTS were screened in vitro. Results: Eleven constituents were isolated including seven first-found ones (1-5, 9, and 10) and four known compounds in this plant. They were cis-1-O-p-coumaroylglycerol (1), trans-1-O-p-coumaroylglycerol (2), caffeoyl glyceride (3), 3,4- dihydroxybenzaldehyde (4), salicylic acid (5), (25R,26R)-26-methoxyspirostan-5- ene-3β-O-α-L-rhamnopyranosyl-(1→2)-[β-D-glucopyranosyl- (1→6)]-β-D-glucopyranoside (6), (25R,26R)-3β, 17α-dihydroxy-26-methoxyspirostan-5-ene-3β-0-a-Z.-rhamnopyranosyl-(l- >2)-[β-D-glucopyranosyl-(l-"6)]-β-D-glucopyranoside (7), diosgenin 3-O-{O-α-L-rhamnopyranosyl-(1→2)-O-[β-D-xylopyranosyl- (1→3)]-β-D-glucopyranoside} (8), (25R)-3β,17α-dihydroxy- 5α-spirostan-6-one-3-O-α-L-rhamnopyranosyl-(1→2) -β-D-glucopyranoside (9), (25R)-3β-hydroxy-5α-spirostan-6-one-3- O-α-L-rhamnopyranosyl-0 (1→2)-β-D-glucopyranoside (10), and (25R)-spirost-5-ene-3β-O-α-L-rhamnopyranosyl-(1→2) -[β-D-glucopyranosyl-(1→6)]-β-D-glucopyranoside (11). Compounds 1-5 showed the favorable scavenging effects on DPPH and ABTS. Conclusion: The study suggests that the phenylic constituents from the bulbs of L. lancifolium have the anti-oxidant effects.