大黄5种饮片中没食子酸和儿茶素的含量比较研究

目的:建立大黄5种饮片中没食子酸和儿茶素的含量测定方法,考察不同炮制方法对鞣质单体含量的影响。方法:采用高效液相色谱法,以梯度洗脱同时测定大黄不同炮制品中没食子酸和儿茶素的含量,选用Zorbax Eclipse XDB-C18柱(4.6 mm×250 mm,5μm);检测波长277 nm;柱温30℃;流速0.9 mL.min-1。结果:大黄酒、醋、熟、炭饮片中没食子酸的含量与生品比较均有不同程度的增加,其中以熟大黄的增加幅度最为显著,质量分数为139.3%。大黄生、酒、醋饮片中儿茶素的含量接近,而熟片和炭片中未检测到。结论:不同的炮制工艺对大黄中没食子酸和儿茶素的含量有较大的影响。     

Combined Water Extracts from Oxidation-Treated Leaves and Branches of Hovenia dulcis Has Anti-Hangover and Liver Protective Effects in Binge Alcohol Intake of Male Mice

Hovenia dulcis, known as the oriental raisin tree, is used for food supplements and traditional medicine for the liver after alcohol-related symptoms. However, little information exists about the use of its leaves and branches. In this study, we established a method to use the leaves and branches to develop anti-hangover treatment and elucidated the underlying mechanisms. Oxidation-treated leaves (OL) exhibited high antioxidant content comparable to that of the peduncles and showed an anti-hangover effect in male mice. The branch extract (BE) was enriched in the flavonoid catechin, approximately five times more than OL extract. The mixture of OL and BE (OLB) was formulated in a 2:1 ratio with frozen-dried extract weight and was tested for anti-hangover effects and protective properties against binge alcohol-induced liver injury. OLB showed better anti-hangover effect than OL. In addition to this anti-hangover effect, OLB protected the liver from oxidative/nitrosative damage induced by binge alcohol intake.     

消溃灵对实验性胃溃疡的防治作用及其毒性实验研究

消溃灵是一种以儿茶和维生素B_2为主要成分的中西药复方制剂,对醋酸型大鼠胃溃疡有显著的修复作用,使溃疡病灶明显缩小、变浅或愈合;对应激型大鼠胃溃疡亦有较好的疗效。未见毒副作用,Ames试验为阴性,亦无致畸胎作用。     

绿茶对耐甲氧西林金黄色葡萄球菌的抗菌作用及机制研究进展

泛耐药的出现,使得耐甲氧西林金黄色葡萄球菌(MRSA)感染的治疗成为临床棘手的问题。绿茶提取物对MRSA有一定的抗菌作用。本文就绿茶对MRSA感染的临床试验、与抗生素的协同抗MRSA作用、有效成分的分离分析及作用机制作一综述。     

Cancer Chemoprevention: Tea Polyphenol Induced Cellular and Molecular Responses

Genetic polymorphisms may modify the effects of environmental risk factors on cancer occurence. We have recentlylaunched a comprehensive epidemiologic project, HERPACC II (Hospital-based Epidemiologic Research Programat Aichi Cancer Center II), including both lifestyle and polymorphism data, following HERPACC-I which solelyconcentrated on lifestyle data. As of April 2001, about 3000 samples of DNA are being stored to conduct case-controlstudies. Genotyping of 46 polymorphisms has been conducted at the laboratory of the Division of Epidemiology andPrevention. Twelve case-control studies and two papers on a new PCR method, PCR-CTPP (polymerase chain reactionwith confronting two-pair primers), have been accepted for publication. Significant findings in Japanese were foundfor 1) gene-environment interaction for esophageal cancer between heavy drinking and aldehyde dehydrogenase 2(ALDH2), 2) malignant lymphoma risk with methylenetetrahydrofalate reductase (MTHFR) and methionine synthase(MS), 3) interactions between smoking and two polymorphisms, interleukin 1B (IL-1B) and myeloperoxidase (MPO)for Helicobacter pylori infection, and 4) smoking habits with dopamine receptor D2 (DRD2) and IL-1B. Furtherstudies on interactions with polymorphisms will continue to be conducted for Japanese, using larger sizes of samples.     

计算机辅助药物靶标搜寻在探索中草药有效成分机制方面的应用

应用INVDOCK软件进行计算机搜寻药物靶标。研究结果显示该软件具有实际应用潜力及在普及型计算机上可进行运算的可行性。此方法除用于研究药物或先导化合物的未知医疗靶标及毒副作用靶标外,亦可用来研究中草药的作用机理。本研究应用INVDOCK寻找数个中草药有效成分的医疗作用靶标并同已知实验结果进行比较。结果表明INVDOCK可作为探索中草药机理的有效辅助工具。     

HPLC法测定七厘散中儿茶素和表儿茶素的含量

目的建立七厘散中儿茶素和表儿茶素的含量测定方法。方法 HPLC法,采用Prevail Select C18(150 mm×4.6mm,5μm)色谱柱,柱温:35℃;以乙腈-水-磷酸(100∶900∶1)为流动相;流速:1 ml/min;检测波长:278 nm。结果儿茶素、表儿茶素线性浓度范围分别为30.08～150.4μg/ml,r=0.9999;12.24～61.20μg/ml,r=0.9999;回收率分别为99.1%和97.4%,RSD分别为1.1%和1.2%。结论本方法操作简便,测定结果准确可靠,可用于七厘散中儿茶素和表儿茶素的含量测定。     

Simultaneous Determination of Contents of Three Active Components in Jiejia Tincture by HPLC Method

The objective of the study was to determine the contents of three active components in Jiejia tincture by establishing HPLC method. Test articles were prepared by ultrasonic extraction. Separation was performed using a Kromasil C18 (250 mm × 4.6 mm, 5 µm) chromatographic column, and gradient elution was performed with acetonitrile-0.3% phosphoric acid solution as the mobile phase at a volumetric flow rate of 0.80 mL/min. The contents of catechin, baicalin and berberine in Jiejia tincture were determined at the wavelength of 276 nm and a column temperature of 30 □. The results revealed that catechin showed a good linear relationship at the range of 100∼800 µg/mL (r=0.9997); baicalin showed a good linear relationship at the range of 15∼120 µg/mL (r=0.9996), and berberine at the range of 7∼56 µg/mL (r=0.9995). Their average recovery rates were 99.67% (RSD 1.01%, n=6), 98.7% (RSD 1.93%, n=6) and 100.5% (RSD 2.88%, n=6) respectively. The study concluded that the high-performance liquid chromatography established in this study was simple, accurate and reproducible, and can also be used in the determination of catechin, baicalin and berberine contents in Jiejia tincture.     

Green tea—a new perspective of glaucoma prevention

AIMTo determine how green tea and catechins can affect intraocular pressure (IOP) changes.METHODSTotally 43 young volunteers were included in the study. The experiment was held between noon and 2 p.m. Two extracts—green tea and epigallocatechin gallate (EGCG, 400 mg capsules) and placebo (400 mg capsules) were used in the study. Participants were divided into three groups. Green tea extract group (GT group) had 17 subjects, EGCG extract group 17 subjects, control (placebo) group 9 subjects. IOP was measured with the Icare tonometer before and 30min, 1, 1.5, 2h after the consumption of each extract and placebo. Results were analyzed using the IBM SPSS program. Statistical confidence level P<0.05.RESULTSThe most significant reduction of IOP from the beginning of the experiment was measured after 2h in GT group (left 2.18±3.19 mm Hg, P=0.012; right 2.59±1.97 mm Hg, P<0.000) and after 1h in EGCG extract group (left 2.41±2.98 mm Hg, P<0.004; right 1.94±1.98 mm Hg, P<0.001). In control group no significant changes were measured.CONCLUSIONPeople who have increased IOP or risk factors for glaucoma development, could benefit from drinking green tea or its concentrated extracts in moderate doses.     

Effect of boldo (Peumus boldus Molina) infusion on lipoperoxidation induced by cisplatin in mice liver

Peumus boldus Molina (Monimiaceae), commonly referred to as ‘boldo’, is used in traditional Chilean medicine to treat hepatic and gastrointestinal diseases. Its leaves are rich in antioxidant compounds, principally alkaloids and flavonoids. This study evaluates the protective effect of a complete boldo leaf infusion on lipoperoxidation (MDA determination at 532 nm) induced by cisplatin in mice liver. To determine if the observed effect can be explained by the action of boldine or catechin, each compound was studied separately. The mice were divided into 8 groups (n = 6): (I) not treated; (II) treated with cisplatin 6 mg/Kg b.w.; (III) treated with boldo leaf infusion 5%; (IV) pretreated with boldo leaf infusion 5% and treated with cisplatin 6 mg/Kg b.w.; (V) treated with boldine 50 mg/Kg b.w.; (VI) pretreated with boldine 50 mg/Kg b.w. and treated with cisplatin 6 mg/kg.b.w.; (VII) treated with catechin; and (VIII) pretreated with catechin 50 mg/Kg b.w. and treated with cisplatin 6 mg/Kg b.w. As expected, the treatment with cisplatin significantly increased (p < 0.01) lipoperoxidation in comparison with the non‐treated group. Pretreatment with boldo leaf infusion significantly diminished (p < 0.05) the lipoperoxidation induced by cisplatin with respect to the animals not pretreated with the infusion. The pretreatments with boldine and catechin significantly diminished (p < 0.05) the lipoperoxidation induced by cisplatin with respect to the group treated only with cisplatin. The results suggest that the boldo infusion is acting as a protector with respect to the oxidative hepatic damage caused by cisplatin, and that this protective ability would be due to the presence in the infusion of the natural antioxidants boldine and principally catechin. These findings suggest the potential use of the infusion as a chemoprotector. Copyright © 2009 John Wiley & Sons, Ltd.