首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 78 毫秒
1.
目的:优选槐米防晒成分芦丁的最佳提取工艺。方法采用紫外分光光度法检测槐米提取液在波长200~400 nm各区间的平均吸收率,采用高效液相色谱法测定其主要成分芦丁含量。分别以槐米提取液紫外吸收率、芦丁含量为指标,对超声波提取工艺进行单因素考察,并采用L9(34)正交试验优选槐米芦丁的提取工艺。结果槐米提取液在UVA、UVB、UVC波段内对紫外线均有较强的吸收作用。槐米提取液的最佳提取工艺:乙醇浓度为70%,料液比为1:30,超声时间为30 min,超声温度为65℃。结论槐米提取液在紫外各区间均有较强吸光能力,具有很好的广谱防晒能力。超声波提取法具有时间短、提取率高等优点,可用于槐米防晒成分芦丁的提取。  相似文献   

2.
用正交设计,以槐米中所含的鞣质、芦丁,槲皮素为指标,研究槐米炭炮制工艺。试验数据经用多指标试验公式评分法处理,得出最佳制炭工艺方案,即铁锅温度  相似文献   

3.
目的 对不同炮制程度的槐米炭(生品、轻炭、标炭、重炭)进行质量评价.方法 测定不同炮制程度槐米样品的色素吸附力、鞣质质量分数、pH值及电导率,以这4个因素为质量控制指标,运用主成分分析与聚类分析法对40批槐米不同程度炮制品进行分析比较.结果 不同炮制程度的槐米的色素吸附力、鞣质质量分数、pH值及电导率具有明显的差异,这4个指标具有一定的变化规律,随着炮制程度的加深,色素吸附力和鞣质质量分数呈先上升后下降的趋势,pH值呈上升的趋势,而电导率的趋势与pH的正好相反;主成分分析和聚类分析结果均表明,不同炮制程度槐米炭可聚为4类.结论 运用主成分分析和聚类分析对不同炮制程度槐米进行评价,方法简单,可为槐米炭的质量控制提供科学依据.  相似文献   

4.
正交法优化槐米中芦丁的提取工艺   总被引:11,自引:0,他引:11  
目的优选槐米的最佳提取条件。方法以槐米中所含成分芦丁含量和提取率为评价指标,采用L9(34)正交试验,对影响槐米的沸水煎煮提取效果的诸因素(药材的粉碎度、溶剂用量、提取次数、提取时间)进行优选。结果药材为细粉、溶剂2 500 mL、提取3次、提取时间40 m in提取效果最好。结论本实验为优化槐米中芦丁的提取工艺提供了参考依据。  相似文献   

5.
目的 优选槐米中槲皮素的提取工艺。方法 采用正交试验法,以提取物中槲皮素的含量和槲皮素的提取率为指标进行试验。结果 优选出从槐米中提取槲皮素的最佳工艺为:用10倍量的0.05%氢氧化钠溶液煮沸4次,每次20min,调节pH值至6,取沉淀加10倍量的4%硫酸溶液微沸水解1h。结论 该工艺可提高槐米中槲皮素的提取率和纯度。  相似文献   

6.
槲皮素及槐米提取物对小鼠Lewis肺癌的抑瘤实验研究   总被引:2,自引:0,他引:2  
目的 观察槲皮素及槐米提取物对小鼠Lewis肺癌的肿瘤生长抑制作用 ,以及与顺铂联合治疗的效果 ,并探讨其对小鼠免疫功能器官重量和血常规指标的影响。方法 以槲皮素和槐米提取物制成受试溶液 ,以移植Lewis肺癌的ICR小鼠为动物模型 ,槲皮素试验组和槐米提取物试验组分别在移植前以槲皮素或槐米提取物连续灌胃 10d ,在移植后继续灌胃 16d ,顺铂治疗组在移植后隔天腹腔注射 1mg/kg剂量的顺铂 1次 ,肿瘤移植 17d后测定各组小鼠体重、瘤重、脾脏及胸腺的重量和血常规指标 ,计算抑瘤率 ,脾指数和胸腺指数。结果 槲皮素高、中、低剂量组的抑瘤率分别为 4 4 .5 %、4 2 .7%、34.3% ;槐米提取物高、中、低剂量组抑瘤率分别为 4 6 .4 %、4 3.8%、37.3%。顺铂治疗组的抑瘤率为 4 0 .2 % ,而顺铂 中剂量槲皮素组和顺铂 中剂量槐米提取物组的抑瘤率分别为 4 9.3%和 5 5 .2 %。小鼠荷瘤后出现脾脏重量和血常规指标的异常 ,经过治疗后 ,异常状态有明显改善。结论 经口给予槲皮素和槐米提取物对小鼠Lewis肺癌有良好的抑瘤作用 ,与顺铂联合治疗的效果明显增强。  相似文献   

7.
反相高效液相色谱法测定槐米中槲皮素的含量   总被引:6,自引:0,他引:6  
中药槐米为豆科植物槐Sophora japonica L的干燥花蕾,具有清热止血的功效,用于血热所致的各种出血症。槐米的成分十分复杂,主要有效成分是芦丁和槲皮素等黄酮类生物活性物质。槲皮素具有抗炎、抗氧化、抗过敏、抗菌、抗病毒等多方面的药理作用,其对恶性肿瘤生长和转移的抑制作用是近年来一个十分活跃的研究课题。槲皮素是芦丁的甙元。因此分析测定槐米中黄酮类化合物含量时,一般先通过酸水解方法,使芦丁转化成槲皮素。槲皮素的高效液相色谱测定方法已有文献报道,但槲皮素的提取方法为中国药典(2000版,第一卷)记录的甲醇提取法,而且提取与酸水解同时进行,提取率低,溶剂使用量大,因此提取成本高,且会造成环境污染。本实验利用芦丁在沸水与冷水中的溶解度不同,先提取槐米中的芦丁,然后再将其酸水解为槲皮素.大大提高了提取率,为槐米中药制剂开发研制提供了一种新技术。  相似文献   

8.
目的研究内生真菌胞外漆酶在槐米总黄酮提取中的应用。方法内生镰刀菌在起始pH7.0的综合马铃薯培养基中,20℃下摇瓶培养6d,具有较高的漆酶活力(36.1U/mL)。槐米干粉投入真菌发酵液中进行酶解处理,比较酶料比、酶解温度、酶解时间和酶解液pH值对槐米总黄酮提取率的影响。结果槐米干粉以酶料比40∶1加入粗酶液中,在pH7.0、20℃下酶解处理1h后,总黄酮提取率可达11.4%,比常规提取法提高了28.7%。结论内生菌漆酶辅助提取法为槐米总黄酮提取的可行新方法。  相似文献   

9.
醋炒槐米炮制前后鞣质和黄酮的含量变化   总被引:6,自引:0,他引:6  
槐米是中医常用的止血药,主要用于清热、凉血、止血。药典规定的炮制品种有炒槐米和槐米炭。根据传统经验“炒炭存性”的道理,槐米经炒炭后会使鞣质的含量增加㈨,并保存有一定数量的芦丁。鞣质具收敛性,能与蛋白质结合形成不溶于水的化合物,在粘膜表面起保护作用,制止过多的出血。经药理实验证明:鞣质含量高者止血作用明显增强。除具有收敛止血作用的鞣质外,槐米中含有芦丁(Rutin)、槐花米甲素、乙素、丙素等黄酮类和甾醇类化合物,还含有少量三萜皂甙。其中芦丁有改善毛细血管脆性的作用。有关槐米炭的炮制条件和含量变化的探讨,文献报道较多。本文主要是对按云南省中药饮片炮制规范炮制的醋炒槐米,在炮制前后的鞣质和黄酮的含量变化进行了探讨,并和药典炮  相似文献   

10.
<正>槐米为豆科植物槐的干燥花蕾。每年夏季在花未开时采收的花蕾,商品称为"槐米";采收初开的花朵,商品称为"槐花"。采收后除去杂质,当天即要晒干,以防霉变。槐米与槐花的功效相同,均性凉,味苦,入肝、大肠经,具有清热、凉血、止血的功效,用于治疗肠风便血、痔血、尿  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
目的:评价使用安心颗粒对急诊经皮冠状动脉介入术(PPCI)术后生活质量的影响.方法:将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组(术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次)和对照组(仅接受基础药物治疗).所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表(MIDAS)、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果:入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异(P>0.05);出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低(P<0.05);组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低(P<0.05).两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血(P>0.05).两组发生轻度血小板减少症的患者数比较无差异(P>0.05).结论:PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.  相似文献   

20.
Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P<0.01);the MAP decreased(P<0.01)and the HR increased drastically(P<0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号