ABSTRACT
Objective: To study the nitrogenous compounds of Sargassum pallidum. Methods: The compounds were separated and purified by D101 macroporous adsorptive resins, silica gel chromatography, Sephadex LH-20 chromatography, ODS column chromatography, and HPLC methods. Their structures were identified on the basis of physical and chemical properties and spectroscopic data (1H-NMR, 13C-NMR, and MS). Results: Ten compounds were isolated from S. pallidum and identified as (-)-anabellamide (1), (-)-trichosanatine (2), (-)-aurantiamide acetate (3), riboflavin (4), β-adenosine (5), 2'-Ο-methoxyluridine (6), cyclo (L-Ala-L-Pro) (7), thymidine (8), 1-(β-D-ribofuranosyl)-1H-1, 2, 4-triazone (9), and 2, 3-dihydro-4 (1H)-quinolone (10). Conclusion: Compounds 1, 2, 4-7, and 9 are isolated from the genus Sargassum (Turn.) C. Ag. for the first time.
ABSTRACT
Objective: To investigate the chemical constituents from the stems of Gnaphlium affine. Methods: The constituents were isolated and purified by silica gel, Sephadex LH-20 column chromatography, and preparative TLC. The structures were identified on the basis of spectral data and physiochemical characteristics. Results: Fifteen compounds were isolated from 70% ethanol extracts of G. affine and identified as 3-methoxyphenol1-O-α-L-rhamnopyranosyl-(1→6)-O-β- D-glucopyranoside (1), 3', 5-dihydroxy-2-(4- hydroxybenzyl)-3-methoxybibenzyl (2), physcion (3), aldehyde (4), luteolin-4'-O-β-D-glucoside (5), faradiol 3-O-palmitate (6), betulinic acid (7), anabellamide (8), 4-O-D-glucopyranosyl-p-coumaric acid methyl ester (9), valene-1 (10)-ene-8, 11-diol (10), longumoside A (11), grossamiade K (12), quercetin-3-O-rutin-7-O-glucoside (13), luteolin-7-O-β-D-glucopyranosyl-(1→6)-[(6'''- O-caffeoylquinic)-β-D-glucopyranoside] (14), and isoverbascoside (15). Conclusion: Compounds 2 and 11 are reported from the plants in Gnaphalium L. for the first time. Compounds 2, 3, 6, 8, 13, and 14 are isolated from this plant material for the first time.
ABSTRACT
Objective: To investigate the chemical constituents from the stems of Ficus auricalata. Methods: The constituents were isolated and purified by silica gel, Sephadex LH-20 column chromatography, and preparative TLC. Their structures were identified on the basis of spectral data and physiochemical characteristics. Results: Fourteen compounds were isolated from 95% ethanol extracts and identified as stigmast-4-ene-6β-ol-3-one (1), stigmast-4-ene-6α-ol-3-one (2), stigmast-4-ene-3-one (3), stigmast-5-ene-3β-ol-7-one (4), stigmast-4-ene-3, 6-dione (5), ergosterol peroxide (6), (20S)-3-oxo-hydroxytaraxastane (7), anabellamide (8), aurantiamide acetate (9) palmarumycin BG1 (10), 7-oxodehydroabietic acid (11), coniferyl aldehyde (12), S-(+)-dehydrovomifoliol (13), and 4-hydroxy-3-methoxy-benzoic acid (14). Conclusion: Compounds 2, 5, and 7-13 are reported from the plants in genus Ficus Linn. for the first time. All compounds are isolated from this plant material for the first time.