OBJECTIVE:To study the scavenging action of Longyanshen on O2 ?- and ? OH.METHODS:Spectrophotometry (wavelength 322nm and 536nm)was used to detect the effects of Longyanshen upon O2 ?- and?OHRESULTS:Longyanshen in concentration of 30g/ml could reduce the level of?OH by 284%,and Longyanshen in concentrations of 15g/ml,30g/ml and 60g/ml could decrease the levels of O2 ?- by 441%,630% and 479% and inhibit the generation of O2 ?- by 489%,589%and 675% in vitro,respectivelyCONCLUSION:The results show that Longyanshen could scavenge and inhibit O2 ?- markedly(P

OBJECTIVE:To study the protective effects and mechanisms of Longyanshen on chemical liver injury in mice.METHODS:The models of CCl 4 ,TAA and acetaminophen induced acute liver injury in mice were used to study the pro?tective effects of Longyanshen,and relevant parameters were detected and compared.RESULTS:Compared with model group,in Longyanshen group,activity of ALT markedly decreased,the contents of hepatic cyt P 450 ,cyt b 5 increased,the content of MDA in liver tissue significantly decreased,the activities of aniline hydroxylase and aminopurine-N-demethylase increased,the activity of Ca 2+ -ATPase in hepatic cell microsome markedly decreased and the activities of GSH-PX and the content of GSH increased.CONCLUSION:Longyanshen has protective effect on chemical liver injury in mice and the mechanisms may be related to the antioxidative action,inhibiting effect on lipid peroxidation,inducing the activities of hepatic microsomal enzymes and blocking the calcium channel.

OBJECTIVE:To establish a method for the assaying of total flavonoids in the extracts of Gynostemma and to provide basis for the study of its internal quality.METHOD:The contents of total flavonoids in6kinds of Gynostemma made from Guangxi were determined by UV-spectrophotometry with a detection wavelength at510nm.RESULTS:Good linear re-lationship with absorbability occurred when the concentration range of rutin was0.0092～0.0553mg/ml(r=0.9999,n=6)and its average recovery was100.8%(RSD=2.25%,n=6).CONCLUSION:The method is simple and accurate,of the testing samples,Gynostemma from Guangxi ranked the first in terms of the content of total flavonoids.

OBJECTIVE:To observe the effect of extract of longyanshen(EL)on immunodepression induced by cyclophosphamide in mice.METHODS:The immunodepression was induced by cyclophosphamide,the the different oral doses of EL were given to mice for 30 days,and control group took NS.RESULTS:The different doses of EL could significantly increase the killing function of neutrophil(P

OBJECTIVE:To optimize the conditions of the extraction technique for compound Liuyuexue gran?ules.METHODS:The herbs in formulation were first extracted by ethanol percolating,then the dregs were decocted with water to be extracted once more.Taking oleanolic acid and total flavones as evaluation markers,the extraction technique in two-step process was evaluated by orthogonal design.RESULTS:The optimum condition of ethanol percolating process was that the crude herb powder was soaked by8-fold80%ethanol for24hours and the optimum condition of water decocting process was that the dregs were decocted for3times with12-fold water,1.5hour each time.CONCLUSION:The repeated experimental results are stable,and the contents of components for markers are high.The optimum conditions can be used for enlarged pro?duction.

Aim To observe the effects of LYS polysaccharides on expressions of APP, PS1, PS2 and ApoE in SAMP8 mouse brain. Methods 50 6-month-old SAMP8 mice were used and divided randomly into 5 groups: SAMP8 untreated control group, huperzine A control group, low-, mid-and high-dose groups of polysaccharides, with 10 mice in each group. 10 6-month-old SAMR1 mice were used as normal control. After each group was treated by corresponding drug for 40 days continuously, the mRNA contents of APP, PS1, PS2 and ApoE in brain tissue were assayed by reverse transcription polymerase chain reaction.Results The low-, mid-and high-dose groups of polysaccharides could reduce the mRNA contents of APP, PS1 and PS2, which showed a dose-effect relationship in some degrees. But it could not affect the content of ApoE. Conclusion LYS polysaccharides could inhibit the expressions of APP, PS1, and PS2 in SAMP8 mouse brain.

Aim To observe the protective effects of two flavone morphons on hypoxia/reoxygenation(H/R) injury in myocardial cells and explore the mechanisms.Methods The hypoxia/reoxygenation injury model of cultured neonatal rat cardiomyocytes was developed. The cell morphology,the spontaneous beating,the survival rate,the content of LDH,NOS,T-SOD,MDA and the activity of Na+,K+-ATP,Ca2+,Mg2+-ATP enzyme were determined in the cultured neonatal rat cardiomyocytes injuried by H/R.Results Compared with the model,preconditioning by two flavone morphons enhanced the spontaneous beating and the survival rate. Meanwhile,it increased the activity of T-SOD,Na+,K+-ATP,Ca2+,Mg2+-ATP enzyme and decreased the release of LDH,NOS,MDA(P

OBJECTIVE:To evaluate the bioequivalence of domestic secnidazole tablet,capsule and imported secnidazole tablet in healthy volunteers.METHODS:18healthy volunteers were randomly divided into3groups according to a triple-cross design,all the volunteers were given a single dose of1g secnidazole,the interval for washout period of3times adminis?tration was14days.The plasma drug concentration of secnidazole was determined by HPLC-UV.RESULTS:The main pharmacokinetic parameters of homemade tablet and homemade capsule and imported tablet were as follow,t max were(2.00?1.93),(2.67?2.14)and(1.54?1.53)h respectively,t 1/2 were(28.56?4.98)、(29.69?6.81)and(27.16?5.06)h,C max were(25.50?2.74),(24.27?3.76)and(25.64?4.10)?g/ml respectively.AUC 0～t were(736.03?73.20),(704.78?88.51)and(737.77?76.02)(?g?h)/ml respcetively.AUC 0～∞ were(886.36?114.50),(864.57?172.27)and(870.64?100.21)(?g?h)/ml respectively.The relative bioavailability of homemade tablet was(100.02?6.73)%,and that of homemade capsule was(95.91?10.66)%.CONCLUSION:3preparations of secnidazole are bioequivalent.

AIM:To study the inhibitory effect of Compound Liuyuexue(Tarphochlamys affinis(Giff) Bremekhu,Herba Hedyotis,Raidx Gardeniae,etc.)(CLYX) on HBV in vitro.METHODS:The serum containing CLYX was added to cultured HepG2.2.15 cells,and HepG2.2.15 cells were cultured in medium containing the serum with CLYX for 72 h and 144 h.The culture media were collected for determining the levels of HBsAg and HBeAg by ELISA.RESULTS:The serum containing CLYX could markedly inhibit HBsAg and HBeAg expressions in the HepG2.2.15 cells(P