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 62 毫秒
1.
目的研究硝酸咪康唑载体栓制备处方和工艺并进行质量考察。方法通过正交试验筛选硝酸咪康唑载体栓处方工艺。采用RP-HPLC方法测定药物浓度,对药物溶出度进行考察。结果明胶∶水∶甘油=1∶2∶2为最佳基质,溶胀时间为60 min,在70℃水浴加热熔融制得的载体栓剂质量最好。结论该工艺方法工艺简单,切实可行,可为中试生产提供参考。  相似文献   

2.
目的 采用喷雾干燥法制备丹参素微囊。 方法 以包封率为指标,比较不同囊材的包封情况;以微囊产率为指标,采用二次回归通用旋转组和设计确定喷雾干燥条件;对制备的微囊进行体外释药研究。结果 以PVA 作为囊材,囊材与药物比例为3∶1,喷雾干燥条件为进风温度190 ℃,蠕动泵进样速率36 r/min,微囊包封率为85.0%,产率为56.1%,70%以上微囊粒径在6~12 μm。 结论 制备丹参素微囊工艺合理,产品具有一定的缓释效果。  相似文献   

3.
目的优化南五味子种子油制备生物柴油的工艺条件。方法利用超声提取法提取南五味子种子油,以种子油为原料,采用酯交换法制备生物柴油。以生物柴油产率为响应值,利用响应面法设计实验并分析结果,确定制备生物柴油的最佳工艺条件。结果优选出最佳工艺条件为醇油比为9.01∶1(m L/g)、催化剂用量为0.78%(g/g)、反应时间为59 min,生物柴油产率达81.45%。结论该回归模型能较好的优化南五味子种子油制备生物柴油的工艺。  相似文献   

4.
以酚醛树脂为黏结剂,在活性炭(ACH)表面担载MnOx制备蜂窝状MnOx/ACH催化剂,考察了制备工艺条件对MnOx/ACH催化剂低温脱硝活性的影响。结果表明,酚醛树脂质量分数越高,所制ACH的机械强度越大,对孔道堵塞越严重;脱硝活性随着酚醛树脂质量分数的增加而逐渐降低。当载锰量(Mn的质量分数)为3%~15%时,随载锰量的增加脱硝活性增加;继续增加载锰量,脱硝活性变化不大。在300~600 ℃内,脱硝活性随煅烧温度的升高呈先增加后降低的趋势。此外,由于空气氧化使得低价态的锰氧化物转化为高价态的锰氧化物,从而导致脱硝活性大大提高。其中,在酚醛树脂质量分数为25%、载锰量为10%、400 ℃煅烧并经空气氧化的最佳工艺条件下,该催化剂在200 ℃下NO转化率达95%左右。  相似文献   

5.
目的:采用胶体研磨法制备消炎止带汤羌活挥发油β-环糊精包合物。方法:采用正交实验设计,以包合率为指标筛选最佳包合工艺。结果:最佳包合工艺为A2B2C2D3,即研磨时间30 min,羌活挥发油∶β-CD=1∶8,包合温度30℃,羌活挥发油∶β-CD=1∶8,β-CD∶纯化水=1∶8。结论:通过正交实验优化出的羌活挥发油-β-环糊精包合物包合工艺能达到较高的包合率和产率。  相似文献   

6.
目的:研究喷雾干燥法制备氨茶碱/壳聚糖/β-环糊精微球的制备工艺。方法采用正交设计优化喷雾干燥法制备氨茶碱/壳聚糖/β-环糊精微球的制备条件,考察氨茶碱在β-环糊精溶液中的溶解度以及氨茶碱/壳聚糖/β-环糊精微球的载药量、包封率、产率、含水率和外观形态等特性。结果氨茶碱的溶解度随温度和β-环糊精溶液浓度的增加而增加;根据载药量氨茶碱/壳聚糖/β-环糊精微球喷雾干燥的最佳工艺条件为A1 B3 C1 D3,即进口温度为150℃,进料速度为8ml/min,空气流量为400L/h,壳聚糖分子量为130万;氨茶碱/壳聚糖/β-环糊精微球的载药量、包封率、产率和含水率分别为19.3%±0.5%,77.4%±0.6%,39.5%±1.0%,9.7%±0.7%;扫描电镜显示微球外观圆整,表面光滑或有少许皱褶;喷嘴直径为0.7mm时制得的微球粒径更小且较均一。结论采用正交设计优选了最佳制备工艺,其制得的氨茶碱/壳聚糖/β-环糊精微球具有较高的载药量、包封率、产率和较低的含水率,微球圆整,带少许皱褶,有望成为肺部吸入的理想药物载体。  相似文献   

7.
辣椒碱纳米乳注射剂的制备及其体外评价   总被引:1,自引:0,他引:1  
目的研究辣椒碱纳米乳注射剂的处方和制备工艺,并对其质量进行评价。方法以外观、粒径、包封率为指标,通过单因素试验筛选处方成分,包括油相、乳化剂、助乳化剂组成及比例,同时优化制备工艺。结果优选得辣椒碱纳米乳处方组成为:中链脂肪酸三甘油酯∶吐温80∶豆磷脂∶丙二醇的质量比为1.5∶2.5∶1.25∶1.5;所制得纳米乳滴平均粒径6.16 nm,多分散系数0.307,包封率85.22%。结论制得的辣椒碱纳米乳制备工艺简单,并符合纳米乳主要指标要求。  相似文献   

8.
目的 研究3-氨基-2-[(2'-氰基联苯-4-基)甲基]氨基-苯甲酸乙酯的最优合成工艺。方法 以2-[(2'-氰基联苯-4-基)-甲基]氨基-3-硝基苯甲酸乙酯为原料,水合肼为还原剂,Pb/C为催化剂,还原制得。结果 原料与还原剂的最佳物质的量比为1.92∶1,催化剂Pd/C为1.2 g,反应温度为75 ℃,反应时间2 h的最优条件下,收率为92.0%。结论 本合成工艺稳定,条件温和,产率高,适合3-氨基-2-[(2'-氰基联苯-4-基)甲基]氨基-苯甲酸乙酯的工业化生产。  相似文献   

9.
制备具有适宜酸性能和最佳物理性质的催化剂是甲醇制低碳烯烃(MTO)工艺的关键。采用水热晶化法,考察了不同模板剂、模板剂用量、pH、晶化时间和温度等因素对SAPO-34分子筛制备的影响,并采用XRD、SEM、BET和NH3-TPD等方法进行表征,从而考察分子筛结构、表面酸性等性质对分子筛催化剂在MTO反应中的催化性能的影响。结果表明:四乙基氢氧化铵(TEAOH)为合成SAPO-34的最佳模板剂,与二乙胺相比,TEAOH制得的SAPO-34比表面积大(>400 m2/g),呈立方晶形,颗粒尺寸较小且分布均匀,具有比例适宜的强、弱酸中心;而以二乙胺为模板剂合成的SAPO-34具有较多的强酸中心,酸性较强。采用TEAOH为模板剂,当n(TEAOH)∶n(Al2O3)为2.02~1.35时,减少模板剂用量,合成产物仍为SAPO-34,相对结晶度减小;当n(TEAOH)∶n(Al2O3)为1.35~1.01时,减少模板剂用量会导致SAPO-5与SAPO-34共生。直接、快速的升温过程不利于晶粒的成长;先升温至90~150 ℃并维持这一温度,待过渡相态稳定后再继续升温至170~250 ℃晶化,有利于得到更高结晶度的SAPO-34晶体,此时SAPO-34分子筛在MTO反应中显示了最优的催化性能,甲醇转化率100%,对低碳烯烃的选择性为83.40%,活性时间为220 min。  相似文献   

10.
目的优化肉桂酸中间体的合成工艺。方法通过Perkin合成法制备肉桂酸,考察催化剂、反应时间、温度对产率的影响。结果通过实验优化,催化剂使用无水碳酸钾时,反应温度为160℃,反应时间为50min,肉桂酸的产率较高,为80.5%。结论该工艺简单、可行、原料成本低,为肉桂酸的生产和利用提供了基础研究。  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.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  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