ABSTRACT
OBJECTIVE： To study the antimicrobial activity of ampelopsin combined with 8 kinds of antibiotic against Pseudomonas aeruginosa （PA） in vitro. METHODS： Chessboard trace dilution method was used to determine minimum inhibitory concentration （MIC） of ampelopsin combined with ceftriaxone， cefoperazone/sulbactam， piperacillin/tazobactam， cefoperazone， ciprofloxacin， amikacin， piperacillin and cefepime to PA strain ATCC27853 and 7 isolated strains PA135， PA216， PA276， PA281， PA291， PA314 and PA319. Fractional inhibitory concentration index （FICI） was used to evaluate its effects of drug combination. Clinically isolated strain PA319 were taken as target strain and then divided into normal control group， ampelopsin alone group， antibiotics alone group and ampelopsin+antibiotic combination group. Using MIC of ampelopsin and antibiotics during drug combination as active concentration， the number of colonies cultured for 0， 4， 8， 12 and 24 h was counted， and the time-sterilization curve was drawn. RESULTS： For above 8 kinds of strains， MIC of ampelopsin alone was 128-256 mg/L； FICI of ampelopsin combined with ceftriaxone， cefoperazone/sulbactam， piperacillin/tazobactam， cefoperazone， ciprofloxacin， amikacin， piperacillin and cefepime to 8， 8， 7， 6， 4， 4， 6 and 6 strains were equal to or lower than 1， respectively. In time-antibacterial curve， compared with antibiotics alone， the number of colonies decreased by 2.65， 2.30， 0.42， 0.47， 0.53， 1.19， 1.74， 1.04 lgCFU/mL respectively after ampelopsin combined with ceftriaxone， cefperazone/sulbactam， piperacillin/tazobactam， cefoperazone， ciprofloxacin， amikacin， piperacillin and cefepime. CONCLUSIONS： Ampelopsin combined with ceftriaxone and cefoperazone/sulbactam show better antibacterial effect on PA.
ABSTRACT
OBJECTIVE:To determine the antimicrobial activity of alcoholic e xtracts of47traditional Chinese herbal medicines in vitro.METHODS:Antibiotic drug sensitive tests of Escherichia coli and Bacillus pyocyaneus were conducted,al?coholic extracts of47Chinese herbal medicines were prepared,which were subjected to bicteriostatic tests in vitro by agar spread routine method.RESULTS:Among the47traditonal Chinese herbal medicines alcoholic extracts,11of which did have antimicrobial activity against escherichia coli,pseudomonas aeruginosa and blastomyces albicans in different degree;among which,the antimicrobial activity of the alcoholic extracts of paeoniae radix and granatum to drug resistance bacteria were the highest,the alcoholic extracts of paeoniae radix showed strong inhibitory activities to the above3bacterium,especially to the resistant organisms with the minimum inhibitory concentrations(MIC)at1.3,1.1and1.8mg/ml respectively;The antimi?crobial activities of alchoholic extracts of granatum against the above3bacterium were also high with the MIC at8.3,3.6and2.3mg/ml respectively.CONCLUSION:The alcoholic extracts of paeoniae radix and granatum have broad spectrum of an?timicrobial activity and which have antimicrobial effect to drug resistance bacteria.
ABSTRACT
Object To study the chemical constituents of whole plant of Callicarpa pedunculata R Brown Methods Various chromatographic techniques were employed for isolation and purification of its constituents; and their structures were identified by spectral analysis (IR, MS, 1HNMR, 13 CNMR) and chemical evidences Results Ten compounds were obtained from the chloroform extract of the whole plant Among them four were diterpenoids which were identified as: 14 ?-hydroxy-7, 15-isopimaradien-18-oic acid (Ⅰ), 16 ?, 17-dihydroxy-3-oxo-phyllocladanetriol (Ⅱ), 8, 11, 13, 15-abietetraen-18-oic acid (Ⅲ), and 6 ?-hydroxy nidorellol (Ⅳ); 2 flavonoids: 5-hydroxy-3, 4′, 7-trimethoxy-flavone (Ⅴ), and 3, 5-dimethyl kaempherol (Ⅵ); and the others were ursolic acid (Ⅶ), myoinositol (Ⅷ), ?-sitosterol (Ⅸ), and ?-amyrin (Ⅹ) Conclusion Compounds Ⅰ, Ⅱ, Ⅲ, Ⅳ were found in this plant for the first time and it was of interest to note that they were of different diterpenoid skeletons The content of ursolic acid attained to a high level up to 1%, which may be exploited as a natural resource for medical purposes