A new glucosyloxybenzyl derivative from Pleione bulbocodioides and anti-inflammatory activity
Objective To study the main chemical constituents of Pleione bulbocodioides and the anti-inflammatory activities. Methods The main compounds were analyzed by LC-MS;Silica gel column,Sephadex LH-20 gel column chromatography,preparative thin-layer chromatography and semi-preparative liquid chromatography were used to isolate and purify these compounds. The structures of the isolated compounds were identified by spectroscopy (MS and NMR) methods;All the isolates were tested for the anti-inflammatory activities using the lipopolysaccharide (LPS)-activated of RAW264.7 cells. Results A total of 20 compounds were isolated and identified as p-hydroxybenzyl ethyl ether (1),p-hydroxybenzaldehyde (2),4-(methoxymethyl)benzene-1,2-diol (3),3,4-dihydroxybenzaldehyde (4),p-hydroxylbenzyl alcohol (5),(E)-ferulic acid (6),batatasin Ⅲ (7),3,3'-dihydroxy-5-methoxy-2,6-bis(p-hydroxybenzyl)bibenzyl (8),3',5-dihydroxy-3-methoxy-2-(p-hydroxybenzyl)bibenzyl (9),3,3'-dihydroxy-5-methoxy-2-(p-hydroxybenzyl)bibenzyl (10),bletistrin D (11),4-allyl-2,6-dimethoxyphenyl glucoside (12),1-O-(4-hydroxymethylphenoxy)-2-O-trans-cinnamoyl-β-D-glucoside (13),1-O-(4-hydroxymethylphenoxy)-6-O-trans-cinnamoyl-β-D-glucoside (14),militarine (15),bletistroside D (16),gastrodin (17),1-[4'-O-(β-D-glucopyranosyloxy) benzyl)-2-O-(β-D-glucopyranosyloxy)-4-{4'-O-[(3'-O-(E)-feruloyl)-β-D-glucopyranosyloxy]benzyl}-(2R)-2-isobutylsuccinate (18),bletistroside C (19) and dactylorhin A (20). Compounds 7,8,15,16,18—20 are screened for anti-inflammatory activity. Compounds 7,15 and 20 showed 42.5%,23.1% and 23.6% inhibition of NO at 50 μmol/L. Conclusion Compound 18 is identified as a novel compound and named bletistroside M;Compounds 8,11—14,16 and 19 are obtained from this plant for the first time;LC-MS showed that the main chemical constituents were batatasin Ⅲ(7),militarine (15) and dactylorhin A (20). In addition,compound 7 showed the best anti-inflammatory effects.
Pleione bulbocodioides (Franch.) Rolfeanti-inflammatory activityglucosyloxybenzyl 2-isobutylmalatesbatatasin Ⅲbletistroside M