ABSTRACT
@#Newcastle Disease (ND) is a highly pathogenic disease of avian species which is caused by Newcastle Disease Virus (NDV). It is one of the major causes of mortality and morbidity to poultry industry in the third world countries. Currently, there is no treatment measures against ND; the only existing measure is vaccination, though it is incapable to offer 100% immunity. In Tanzania, the leaves of Synadenium glaucescens Pax. are traditionally used for treatment of various ailments including ND. Previously, its leaves extract has been scientifically confirmed to exhibit anti-NDV activity though bioactive compound(s) responsible for this activity is/are unknown. Therefore, this study was aimed to evaluate anti-NDV activity of 3β-Friedelanol (1) and 3α-friedelanol (2) isolated from its leaves extract. Isolation of these compounds was achieved by column chromatography method whereas, their chemical structures were determined by Nuclear Magnetic Resonance (NMR) data and by comparing with the available literature NMR data. Anti-NDV activity study was done in embryonated chicken eggs (ECEs). Treatment of NDV inoculated ECEs with 3β-Friedelanol (1) reduced the viral load to zero and maintained the survival of embryos, this was revealed by continuous organs formation and increase in embryo weights with no significant different (p > 0.05) from un-inoculated ECE. These effects suggest that, 3β-Friedelanol (1) possesses anti-NDV activity. Therefore, existence of 3β-Friedelanol (1) in the leaves of S. glaucescens may justify its earlier described anti-NDV activity and traditional use in the treatment of ND. Hence, its leaves extract may be considered for development of anti-NDV herbal formulation while 3β-Friedelanol could either serve as a drug or lead compound for synthesis of anti-NDV drugs.
ABSTRACT
Cardiovascular and cerebrovascular diseases are the leading cause of death among adult populations in China. The incidence and mortality rate shows an upward trend, and age of onset is younger trend. It is necessary to treat cardiovascular and cerebrovascular diseases with Chinese materia medica. Natural products have been the important and productive source of leading compounds for the development of anti-cardiovascular and cerebrovascular drugs. Naturally occurring triterpenoid saponins are generally plant-derived secondary metabolites with various valuable pharmacological properties. Pentacyclic triterpenoids of which show obvious anti-inflammatory, antitumor and antiviral effects. In recent years, increasing researches focused on the anticardiovascular and cerebrovascular mechanisms and modifications to improve the pharmacological activity and druggability of pentacyclic triterpenes. Based on previous studies, the literatures and patents of nearly 10 years on pentacyclic triterpenoids and their derivatives have been consulted. The research progress of anti-cardio-cerebrovascular activities of four types of compounds, oleanane, ursane, lupane, and friedelane, related to pentacyclic triterpenoids is reviewed, which provides a basis and reference for its further development and utilization in the treatment of cardiovascular and cerebrovascular diseases.
ABSTRACT
Objective: To study the chemical constituents of Salacia cochinchinensis. Methods: The isolates were obtained by silica gel, Sephadex LH-20, MCI column chromatography, as well as prep-HPLC methods. Their structures were indentified on the basis of NMR, MS analyses. Results: Eight compounds were isolated from 90% ethanol extract of S. cochinchinensis. The structures were identified as 28-hydroxyl salaspermic acid (1), pachysandiol A (2), pristimeronol (3), 28-hydroxy-friedelan-3-one-29-oic acid (4), kaempferol-3-O-α-L-rhamnoside (5), 6,7-dimethoxy-4-hydroxyl-1-naphthoic acid (6), grasshopper ketone (7), 3,4,5-trimethoxyl benzoic acid methyl ester (8). Conclusion: Compound 1 is a new friedelane-type triterpenoid. Compounds 2-8 were isolated from the Salacia genus for the first time.
ABSTRACT
OBJECTIVE: To study the chemical constituents from the root bark of Celastrus monospermus Roxb. METHODS: The compounds were isolate and purified by repeated column chromatography on silica gel, ODS and Sephadex LH-20, and the chemical structures of compounds were determined by spectral data analyses. RESULTS: Twenty-three compounds were isolated from this plant, which were identified as β-sitosterol palmitate (1), friedelan-3-one (2), 3β-hydroxyolean-12-en (3), 3β-hydroxylcholest-5,22-dien (4), β-sitosterol (5), 3,22-dioxo-20-taraxastene (6), 3,12-dioxofriedelane (7), 3-oxo-28-hydroxyfriedelane (8), 3-oxo-11β-hydroxyfriedelane (9), 3-oxo-12α-hydroxyfriedelane (10), pristimerin(11), 3-oxo-30-hydroxyfriedelane (12), 3-oxo-29-friedelanoic acid (13), salaspermic acid (14), celastrol (15), 3β, 21β-dihydroxy-30-nor-friedelan-20(29)-en-27-oic acid (16), 3β, 22α-dihydroxy-olean-12-en-29-oic acid (17), wilforol A (18), orthosphenic acid (19), p-hydroxybenzoic acid (20), 3-oxo-2β-hydroxyfriedelan-29-oic acid (21), 21-oxo-2α,3α,22β-trihydroxy-29-nor-friedelan-24,2β-lactone (22)and daucosterol (23). CONCLUSION: Compounds 1,6, 13-14,16-22 are obtained from this plant for the first time, and compounds 16, 20-22 are isolated from the genus Celastrus for the first time.
ABSTRACT
The chemical constituents from lipophilic parts of the stems of Celastrus monospermus were studied in this paper. The compounds were separated and purified by repeated column chromatographic methods including silica gel, ODS and Sephadex LH-20, and the structures of compounds were determined by spectral data analyses. Twenty six compounds were obtained and identified as 3-oxofriedelane(1), 3-oxofriedelan-28-al(2), 3,12-dioxofriedelane(3), 3β-hydroxyolean-12-en(4), 3-oxo-28-hydroxyfriedelane(5), 3-oxo-29-hydroxyfriedelane(6), 3-oxo-11β-hydroxyfriedel-ane(7), 3-oxo-16α-hydroxyfriedelane(8), 3,12-dioxo-28-hydroxyfriedelane(9), 1,3-dioxo-15α-hydroxyfriedelane(10), 3β,6α-dihydroxyolean-12-en(11), 3-oxo-7α,26-dihydroxyfriedel-ane(12), oleanolic acid(13), 3,15-dioxofriedelane(14), 3α-friedelinol(15), 3,12-dioxofriedelan-28-al(16), 3-oxo-12α-hydroxyfriedelane(17), 3,15-dioxo-12α-hydroxyfriedelane(18), 3β,11β-dihydroxyolean-12-en(19), 1β,3β-dihydroxylupan-20(29)-en(20), 3-oxo-12α,28-dihydroxyfriedelane(21), 3β,23-epoxyfriedelan-28-oic acid(22), salaquinone A(23), 2α,3β-dihydroxyfriedelan-28-oic acid(24), 23-nor-6-oxodemethylpristimerol(25) and 3-oxo-friedelan-27,28-dioic acid(26). Among them, compounds 8, 10-15, 18-20, 22-26 were obtained from this plant for the first time, and compounds 8, 10, 12, 14-15, 18, 22-24, 26 were separated from the genus Celastrus for the first time.