高效液相色谱法测定人血浆中汉防己甲素

本文建立了人血浆中汉防己甲素的高效液相色谱测定法。采用C18柱 ,以含 0 0 3%三乙胺的甲醇∶水 (80∶2 0 )为流动相 ,检测波长 2 82nm ,安定为内标 ,样品用乙醚提取。汉防己甲素线性范围 0 2 89～ 4.6 18μg·ml-1,平均加样回收率 95 8% ,日内及日间变异少于 5 %。方法简便、快速、可靠 ,可用于汉防己甲素的生物样本分析。     

粉防己碱对新生大鼠心肌细胞低氧/复氧损伤中细胞凋亡的影响

目的 :研究粉防己碱对培养心肌细胞模拟缺血 /再灌过程中心肌细胞凋亡的影响 .方法 :采用SD大鼠乳鼠进行心肌细胞培养 ,建立模拟心肌缺血 /再灌注模型 ,实验分 3组 :①正常对照组 ;②模拟缺血 /再灌注组 :细胞缺氧 12 0min ,复氧 2 4 0min ;③ 30 μmol·L-1粉防己碱 +缺血 /再灌注组 .计算台盼蓝摄取率 ,测定乳酸脱氢酶 (LDH)活性 ,以流式细胞仪 (FCM)和透射电镜观察细胞凋亡 .结果 :在正常对照组 ,FCM未发现凋亡峰 ,电镜未发现凋亡细胞 ,而缺血 12 0min/再灌注 2 4 0min组FCM的凋亡率为 15 1% ,电镜可见到典型的凋亡细胞 ,台盼蓝摄取率和LDH活性显著增加 (P <0 0 1) .粉防己碱组则细胞大部分存活 ,凋亡率明显降低 (平均 3 2 % ) .结论 :细胞凋亡参与了心肌缺血 /再灌注损伤 ,粉防己碱可减少缺血 /再灌注损伤中的心肌细胞凋亡     

高效液相色谱法测定草酸萘呋胺酯包衣微丸的含量

目的建立草酸萘呋胺酯包衣微丸的含量测定方法。方法采用高效液相色谱法测定,色谱柱:Hypersil BDS C6H5(5μm,4.6×250mm),柱温25℃,流动相:0.05mol.L-1乙酸钠(用磷酸调节pH4.0)-乙腈(40:60),流速:1.0ml.min-1检测波长:283nm,进样量:20μl。结果草酸萘呋胺酯在10μg.ml-1～100μg.ml-1范围内,其峰面积与浓度成良好的线性关系(r=0.9999);平均回收率为99.75%,RSD=0.79%(n=6)。结论该方法可靠,准确,适用于该制剂的含量测定。     

反相高效液相色谱法测定粉防己碱的含量

[目的 ]探讨更有效的测定粉防己碱含量的方法 .[方法 ]选用DESCLuna 5uC18( 2 )色谱柱 ,流动相为甲醇 水 ( 83∶17) ,含 0 5g/L的三乙胺 ,流速为 0 8mL/min ,柱温为 30℃ ,检测波长为 2 82nm .[结果 ]粉防己碱在 0 1137～ 0 6 82 2 μg范围内呈良好的线性关系 ,平均回收率为 10 2 18% .[结论 ]用反相高效液相色谱法测定粉防己碱含量 ,快速、简便、可靠 ,适用于粉防己碱的含量分析 .     

粉防己碱逆转膀胱癌BIU-87/ADM的凋亡抗性及可能机制的研究

目的 探讨粉防己碱(Tet)逆转人膀胱癌耐阿霉素细胞株BIU-87/ADM的凋亡抗性及其可能机制.方法 将膀胱癌耐药株和敏感株分为对照组、粉防己碱组、阿霉素组和阿霉素联合粉防己碱组(n=6),其中阿霉素药物作用浓度为1.5 μg/ml,粉防己碱为1 μg/ml.应用AO/EB染色结合荧光显微镜技术检测细胞凋亡,JC-1...     

粉防己碱对鼠脑缺血海马神经细胞的保护作用

采用全脑缺血再灌注模型,应用Fura-2荧光探针检测海马神经细胞游离钙（［Ca2+］i）水平,硫代巴比妥显色法检测海马匀浆中过氧化脂质（LPO）含量,同时电镜下观察海马CA1区神经细胞改变,以评价药物粉防己碱的作用。结果表明粉防己碱预处理后,能够显著抑制全脑缺血20min再灌注60min海马组织［Ca2+］i及LPO含量的升高,减轻神经细胞病理损伤。提示粉防己碱有一定程度的脑保护作用。     

人参减少 γ射线照射的淋巴细胞微核量(英文)

目的　评价中国人参对减少辐射诱导的人周围血 G0 期淋巴细胞 (PBL)微核量的作用。方法　采用细胞因子阻滞的微核法检测健康志愿者的血标本。体外 1 37Cs照射之前 ,每份血标本的单个核细胞培养以不同浓度 (0～ 2 0 0 0μg· m l- 1 )的人参根水提取物孵育 2 4 h。结果　 (1)在 0 Gy时 ,每 10 0 0个双核 (BN )细胞的微核量是 11.3± 2 .7,人参水提取物≥ 5 0 0μg· ml- 1 时微核量下降 ,但微核量和人参水提取物的浓度之间的差异是显著的。 (2 )单独射线照射显著增加微核量 ,当暴露于 1Gy的照射时 ,随着培养介质中人参水提取物浓度的增加 ,微核量呈显著的线性降低 (R2 =0 .0 5 ,P =0 .0 0 2 ) ;对暴露于 1Gy辐射诱导的微核量 ,人参水提取物浓度在 15 0 0μg· m l- 1 时减少 4 6 .6 % ,浓度在 2 0 0 0μg·m l- 1时减少 5 7.6 % ;对暴露于 2 Gy辐射诱导的微核量的减少呈更强的线性相关 (R2 =0 .7,P=0 .0 0 0 1) ;(3)微核数据分析的结果呈现出与 Poisson模型相关的过度离散趋势。结果表明 :(1)人参水提取物浓度达 2 0 0 0 μg· ml- 1时 ,对 PBL 细胞毒作用无明显影响 ;(2 )人参水提取物浓度在 5 0 0 μg· ml- 1和 2 0 0 0 μg· ml- 1之间时 ,对抗 1 37Cs照射诱导的 MN发挥保护作用。结论　人参可作为一     

回流辅助的双水相体系提取防己中粉防己碱

目的：改进粉防己碱的提取分离工艺,减少环境污染,降低生产成本。方法：采用乙醇/（NH4）2SO4双水相体系,辅以加热回流,提取并分离纯化防己粉末中粉防己碱,考察了乙醇质量分数、（NH4）2SO4体积分数、料液比、pH、回流时间和提取次数等因素对粉防己碱萃取率的影响,并建立高效液相色谱法测定萃取液中粉防己碱含量的分析方法。结果：在乙醇质量分数为20%、（NH4）2SO4体积分数为35%、料液比为1∶8、pH为9时,双水相萃取率为84.50%;回流提取1次、时间为2 h时,防己粗提物的得率为19.80 mg/g,纯度为20.30%。结论：本方法相比于传统提取分离方法如乙醇回流提取以及酸碱法等,操作简便、萃取率高、方法重复性好,所得粗提物纯度较高,可适用于提取粉防己碱。     

Tetrandrine： A Potent Abrogator of G2 Checkpoint Function in Tumor Cells and Its Mechanism

Objective To assess the ability of tetrandrine （Tet） to enhance the sensitivity to irradiation and its mechanism in cell lines of human breast cancer p53-mutant MCF-7/ADR, p53-wild-type MCF-7 and human colon carcinoma p53-mutant HT-29 as well as in C26 colorectal carcinoma-bearing BALB/c mice. Methods MCF-7/ADR, HT-29 and MCF-7 cells were exposed to irradiation in the absence or presence of tetrandrine. The effect of Tet on the cytotoxicity of X-irradiation in these three cells was determined and the effect of tetrandrine on cell cycle arrest induced by irradiation in its absence or presence was studied by flow cytometry. Moreover, mitotic index measurement determined mitosis of cells to enter mitosis. Western blotting was employed to detect cyclin B1 and Cdc2 proteins in extracts from irradiated or non-irradiated cells of MCF-7/ADR, HT-29 and MCF-7 treated with tetrandrine at various concentrations. Tumor growth delay assay was conducted to determine the radio-sensitization of tetrandrine in vivo. Results Clonogenic assay showed that tetrandrine markedly enhanced the lethal effect of X-rays on p53-mutant MCF-7/ADR and HT-29 cells and the sensitization enhancement ratio （SER） of tetrandrine was 1.51 and 1.63, but its SER was only 1.1 in p53-wt MCF-7 cells. Irradiated p53-mutant MCF-7/ADR and HT-29 cells were only arrested in G2/M phase while MCF-7 cells were arrested in G1 and G2/M phases. Radiation-induced G2 phase arrests were abrogated by tetrandrine in a concentration-dependent manner in MCF-7/ADR and HT-29 cells, whereas redistribution within MCF-7 cell cycle changed slightly. The proportion of cells in M phase increased from 1.3% to 14.7% in MCF-7/ADR cells, and from 1.5% to 13.2% in HT-29 cells, but 2.4% to 7.1% in MCF-7 cells. Furthermore, the levels of cyclin B 1 and Cdc2 expression decreased after X-irradiation in MCF-7/ADR and HT-29 cells, and the mitotic index was also lower. Tet could reverse the decrease and induce the irradiated cells to enter mitosis （M phase）. Endosomatic experiment showed that tetrandrine caused tumor growth delay in irradiated mice. Conclusion Tetrandrine boosts the cell killing activity of irradiation both in vitro and in vivo. Tetrandrine is a potent abrogator for G2 checkpoint control and can sensitize the cells to radiation.     

Intravenous tetrandrine in terminating acute episodes of paroxysmal supraventricular tachycardia.

The use of intravenous tetrandrine on paroxysmal supraventricular tachycardia (PSVT) in 32 episodes of 27 cases were studied. The single blind test was done by injecting normal saline as placebo for self-control. Ambulatory ECG was recorded continuously. The dose of tetrandrine ranged from 0.12 to 0.21 g. The success rates of conversion of the placebo and tetrandrine were 3.1% and 83.9% respectively, being statistically significant (P less than 0.001). The efficacy of tetrandrine was comparable to that of verapamil (85%). In 4 cases of WPW syndrome one was converted by the placebo, the other 3 by tetrandrine. Those who did not respond to tetrandrine were mostly suffering from organic heart disease and were supposed to have automatic atrial tachycardia. The time needed for conversion ranged from immediacy after intravenous injection to 20 minutes, with an average of 4.6 minutes. The ECG changes of the termination of PSVT were similar to that of verapamil and can be explained as the effect of slow channel antagonists. Tetrandrine may be an alternative to verapamil in the treatment of PSVT.