[Structure-activity relationships of phenylethanoid glycosides in plants of Cistanche salsa on antioxidative activity].

Objective: To study the structure-activity relationships of phenylethanoid glycosides in plants of Cistanche salsa on antioxidative activity.

Methods: By the assay systems of DPPH*, the antioxidant activity of six phenylethanoid glycosides from plants of Cistanche salsa was determined to investigate the relationship between the antioxidant activities and phenylethanoid glycosides's structural characteristics.

Results: The antioxidative activity of phenylethanoid glycosides was variant with dose-dependent effect.

[Studies on chemical constituents of cultivated Cistanche salsa].

Objective: To study the chemical constituents of cultivated Cistanche salsa.

Methods: Compounds were isolated and purified on several chromatography, and then were identified by physico-chemical properties and structurally elucidated by spectral analysis.

Results: Seven compounds were isolated and identified as beta-sitosterol (I), daucosterol (II), beta-sitosteryl glucoside 3'-O-heptadecoicate (III), 8-hydroxygeraniol 1-beta-D-glucopyranoside (IV), 2-methanol-5-hydroxy-pyridine (V), betaine (VI), galactitol (VII).

[Studies on chemical constituents from root of Hedysarum polybotrys].

Objective: To study the chemical constituents of Hedysarum polybotrys.

Method: Chromatographic methods were used to isolate compounds from H. polybotrys and chemical and spectral methods were used to elucidate the structures of the isolated compounds.

[Studies on chemical constituents of Hedysarum polybotrys].

Aim: To study the chemical constituents of Hedysarum polybotrys Hand.-Mazz..

[Studies on chemical constituents in the root of Hedysarum polybotrys].

Objective: To study the chemical constituents in the root of Hedysarum polybotrys Hand.-Mazz..

[Survey of pharmacology of oleanolic acid].

Objective: To summarize the pharmacological function of oleanolic acid.

Method: Based on the documents and related achievements, the pharmacological function and its mechanism including its clinical use were summed up.

Result And Conclusion: Oleanolic Acid is a natural chemical which has wide-ranging function and abundant source.

[Studies on the chemical constituents in root of Rheum rhizastachyum].

Objective: To investigate the chemical constituents from the root and rhizome of Rheum rhizastachyum.

Method: The compounds were isolated by column chromatography on silica gel, Sephadex LH-20, MCI-gel CHP-20P separately and their structures were elucidated by chemical and spectral technology.

Result: Six compounds were isolated and identified as chrysophanol, emodin, gallic acid, sucrose, 1-O-beta-D-glucopyranosyl-chrysophanols, 1-O-beta-D-glucopyranosyl-emodin.