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1.
黄秋葵粗多糖体外抗氧化活性测定   总被引:2,自引:0,他引:2  
目的:测定黄秋葵粗多糖(RPS)的体外抗氧化活性.方法:采用水提醇沉淀法提取黄秋葵RPS,并用蒽酮-硫酸法测定RPS的含量,应用1,1-二苯基苦味酰基苯肼(DPPH)氧化法检测0.086、0.171、0.342、0.684、1.367和2.734 g/L RPS对 DPPH自由基(DPPH·)的清除率,水杨酸法检测0.157、0.313、0.625、1.250、2.500和5.000 g/L RPS对羟基自由基(·OH)的清除率,邻苯三酚自氧化法检测0.086、0.171、0.342、0.684、1.367和2.734 g/L RPS对超氧阴离子自由基(O2÷)的清除率,以维生素C作阳性对照.结果:黄秋葵中RPS含量为(11.23±0.04)%.RPS对DPDH·、·OH和O2÷的体外清除率呈现剂量依赖性.2.734 g/L RPS对DPPH·和O2÷的清除率分别达(44.48±0.64)%及(35.67±0.21)%,5.000 g/L RPS对·OH的清除率达(68.63±0.07)%.其清除能力较维生素C稍弱.结论:黄秋葵RPS具有较明显的体外抗氧化能力.  相似文献   

2.
目的 优化核桃壳多酚的提取工艺,测定其中各成分的质量分数,并对其抗氧化活性进行研究.方法 以核桃壳为原料,采用超声波辅助技术,乙醇为提取溶剂,从核桃壳中提取多酚物质,结合单因素和正交试验,确定核桃壳多酚提取的最佳工艺;采用超高效液相色谱法(UPLC)对核桃壳多酚的成分进行鉴定:用DPPH、FRAP和ABTS+3种方法测定其抗氧化能力.结果 核桃壳多酚的最佳T艺为:料液比1∶30(g:mL),乙醇体积分数40%,超声时间25 min(超声功率46 kHz,200 W),提取温度60℃;FRAP、DPPH·和ABTS·+4法测得核桃壳多酚的抗氧化活性分别为19.80、21.91、29.30 μmol/g;UPLC法测得各组分及其质量分数分别为:原儿茶酸(18.37±2.23)μg/g、咖啡酸(5.50±0.12) μg/g、芦丁(148.50±3.41) μg/g、异槲皮苷(154.09±21.56) iμg/g和槲皮苷(193.26± 14.92) μg/g.结论 核桃壳多酚具有较强的抗氧化性能,尤其是对ABTS·+自由基的清除能力较强.  相似文献   

3.
目的:研究四叶参内生真菌SYY1的抗氧化活性及其抑菌活性。方法:采用DPPH法和铁氰化钾还原力法测定四叶参内生真菌SYY1的抗氧化活性,用滤纸片法测定其抑菌活性。结果:在测试浓度0~6mg/m L范围内,四叶参内生真菌SYY1对DPPH自由基清除率及其还原能力与浓度均呈明显的量效关系。其IC50值为12.25mg/m L,EC50值为2.16mg/m L。在测试菌株中,四叶参内生真菌SYY1对白色念珠菌YEM30和白色念珠菌SU5314有抑菌作用,其对白色念珠菌YEM30抑菌圈直径为6.69±0.26mm,对白色念珠菌SU5314抑菌圈直径为5.93±0.54mm。结论:四叶参内生真菌SYY1具有一定抗氧化和抑菌活性,是筛选天然生物活性成分的潜在资源。  相似文献   

4.
目的 探讨加压提取最佳优化工艺参数,比较加压提取与加热回流提取三七皂苷物抗氧化活性及抑菌活性.方法 选取压力、温度、料液比、乙醇浓度、药材粒径5个工艺参数指标,采用均匀设计优化法,寻找最佳优化工艺参数,测定未加样品溶液(1,1-二苯基-2-三硝基苯肼,DPPH)溶液、加入样品溶液后加DPPH溶液、DPPH溶液与样品溶液混合后的吸光度及抑菌活性,并与加热回流法进行比较.结果 加压提取最佳优化工艺参数为:压力0.8 MPa、温度120℃、料液比1:20、时间15 min、乙醇浓度80%、药料粒径80目;与加热回流提取法相比,加压提取法提取时间[(15.12±3.14)min比(312.25±85.41)min]显著降低(P<0.01),三七总皂苷加压提取率[(73.14±8.65)%比(52.32±6.54)%]显著升高(P<0.05),两种方法清除率[(91.82±9.86)%比(91.20±10.21)%]、抑菌活性[抑菌圈直径为:大肠杆菌:(16.56±3.14)rmm比(18.12±4.21)mm;金黄色葡萄球菌:(15.02±4.2)mm比(16.15±5.23)mm;枯草杆菌:(16.25±3.47)mm比(17.21±4.26)mm;四联球菌:(15.26±3.62)mm比(17.12±35.24)mm]比较差异无统计学意义(P>0.05).结论 在优化工艺参数的前提下,加压提取技术可以显著提高三七皂苷物有效成分的提取率,缩短提取时间,而且对皂苷类成分抗氧化活性和抑菌活性没有影响.  相似文献   

5.
研究从江南星蕨中分离得到的7种化合物的体外抗氧化活性。采用1, 1-二苯-2-苦基阱自由基(DPPH·)清除法、羟基自由基(·OH)清除法及还原能力,以维生素C(Vc)为阳性对照,分别检测江南星蕨中7种化学成分的抗氧化活性。结果显示化合物1、2、3、4、6、7及Vc对DPPH自由基的半数抑制浓度(IC50)分别为(0.006±0.000,0.005±0.000,0.028±0.001,0.006±0.001,0.033±0.003,0.026±0.002,0.002±0.000)mg/mL,化合物1、2、3、4、7及抗坏血酸(Vc)的吸光度值分别为1.6507、1.5047、1.3347、1.4220、1.0623、1.9454。研究表明江南星蕨中的化学成分具有较强的DPPH自由基清除能力和还原能力,说明江南星蕨中的化学成分具有着良好的体外抗氧化活性。  相似文献   

6.
目的 建立采用高效液相色谱法(HPLC)同时测定阿霉素/姜黄素载双药纳米粒(DOX/CUR-NPs)中阿霉素和姜黄素的含量及包封率的方法.方法 采用乳化溶剂挥发法制备DOX/CUR-NPs;按照制剂含量测定方法学要求考察所建立HPLC法的专属性、精密度、回收性等,并结合超速离心法测定DOX/CUR-NPs的包封率.结果 成功制备了DOX/CUR-NPs;在建立的色谱条件下,DOX和CUR专属性好,精密度、回收率、重复性等试验均符合方法学要求.两药在0.5~50.0 μ g/ml浓度范围内线性关系良好(r=0.9999),纳米粒中DOX与CUR的包封率分别为(58.9±1.11%和(75.4±176)%.结论 HPLC法准确可靠、简单快速,可用于DOX/CUR-NPs的药物含量及包封率的同时测定.  相似文献   

7.
目的:探讨3种不同方法检测维生素C清除自由基能力的差异,为选择一种有效评价抗氧化活性物质清除自由基能力的方法提供依据。方法:分别采用二苯代苦味肼基自由基(DPPH·)分光光度法、Mn2 -H2O2-PAR分光光度法和羟自由基(·OH)试剂盒法对不同浓度的维生素C清除自由基(·OH、DPPH·)的能力进行比较。结果:DPPH·分光光度法、Mn2 -H2O2-PAR分光光度法、·OH试剂盒法检测0.024mg/ml维生素C对自由基的清除率分别为80.09%、95.00%、9.56%,自由基清除率为50%时维生素C浓度(IC50值)分别为0.005、0.013、0.200mg/ml。结论:Mn2 -H2O2-PAR分光光度法的检测结果与DPPH·分光光度法基本一致,该方法可能可以作为评价抗氧化活性物质清除自由基能力的有效方法之一。  相似文献   

8.
荜茇清除DPPH自由基能力的研究   总被引:3,自引:0,他引:3  
目的:研究中药材荜茇清除DPPH自由基(DDPH·)能力.方法:用DPPH法对荜茇七种不同溶剂提取物体外抗氧化活性进行筛选,与抗坏血酸(VitC)比较.结果:荜茇95%乙醇的提取物对DDPH·的清除率最高;清除DDPH·50%时,荜茇95%乙醇提取物折算成药材荜茇所需用量与VitC相比相差约2×103倍.结论:荜茇具有一定的清除DPPH自由基能力.  相似文献   

9.
目的 测定紫背鼠尾草各提取部位的抗氧化能力.方法 用DPPH及ABTS.+ 测定紫背鼠尾草不同提取部位的抗氧化活性.结果 紫背鼠尾草乙酸乙酯部位对 DPPH自由基和ABTS.+ 自由基清除能力最强,在浓度为75 μg/mL时,它对DPPH自由基和ABTS.+自由基清除率分别为36.9 % 和99.8%.但紫背鼠尾草提取物对ABTS.+自由基的清除能力要大于对DPPH自由基的清除能力.结论 紫背鼠尾草乙酸乙酯部位对DPPH自由基和ABTS.+ 自由基具有一定的清除能力,该植物具有较好的抗氧化活性.  相似文献   

10.
目的研究去甲氧基姜黄素纳米乳在大鼠体内的药代动力学行为,并与游离药物去甲氧基姜黄素混悬液进行比较,评价去甲氧基姜黄素纳米乳药代动力学特征。方法 12只SD大鼠分为2组,每组6只。实验组灌胃给予去甲氧基姜黄素纳米乳;对照组灌胃给予游离药物去甲氧基姜黄素混悬液,然后于SD大鼠眼底静脉丛取血,采用HPLC方法测定血浆中去甲氧基姜黄素的浓度。结果去甲氧基姜黄素纳米乳和去甲氧基姜黄素的药代动力学参数如下:血药浓度-时间线下峰面积AUC(0-∞)分别为(962.84±75.27)μg·h/L和(235.62±11.28)μg·h/L;T1/2分别为(38.85±6.54)h和(8.23±2.92)h;体内滞留时间MRT(0-∞)分别为(50.92±4.58)h和(8.46±2.61)h,去甲氧基姜黄素纳米乳的AUC(0-∞)、T1/2、MRT(0-∞)分别为去甲氧基姜黄素的4.08、4.72倍和6.01倍。结论去甲氧基姜黄素纳米乳相对于去甲氧基姜黄素而言,生物利用度有明显提高。  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   

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