银杏叶原花青素的制备及其抗氧化活性研究

目的 制备高纯度的银杏原花青素,为系统研究银杏来源的原花青素提供物质基础。方法 利用NP-HPLC方法指导大孔树脂及聚酰胺树脂的纯化工艺,分析并定量所得原花青素提取物中黄酮杂质的组成及含量,用DPPH法比较银杏和葡萄籽来源的原花青素的抗氧化活性。结果 制备得到的银杏原花青素提取物中原花青素的含量>90%,黄酮杂质含量仅为3.44%,DPPH清除率IC₅₀为22.87 μg·mL^-1,葡萄籽原花青素IC₅₀为36.99 μg·mL^-1。结论 本研究工艺可制备获得高纯度的银杏原花青素,其抗氧化活性较葡萄籽原花青素更强。     

中药基于Nrf2/ARE通路改善糖尿病心肌病的研究进展

糖尿病心肌病(diabetic cardiomyopathy,DCM)是糖尿病心血管并发症之一,约30％糖尿病患者会出现心功能障碍,并逐渐发展为DCM,最终导致心力衰竭而死亡.核因子E2相关因子2(nuclear factor NF-E2-related factor 2,Nrf2)是治疗DCM的作用靶点之一,在增强心...     

野菊花总黄酮提取方法比较及其抗氧化活性研究

目的研究不同提取工艺的野菊花中总黄酮的量及其抗氧化活性。方法采用经典回流提取法、超声提取法、组织破碎提取法提取野菊花中黄酮类成分,以芦丁为对照品,通过紫外-可见分光光度法测定黄酮类成分的量,并用流动注射化学发光法测定野菊花中黄酮类成分的抗氧化活性。结果经典回流提取法、超声提取法、组织破碎提取法所提取的总黄酮的量分别为12.60、11.02、10.95 mg/g,采用流动注射化学发光法测得3种不同提取方法的总黄酮提取物的IC50分别是2.67、3.43、5.13μg/m L。结论经典回流提取法提取得到的野菊花总黄酮的量最高,且抗氧化活性最强,说明野菊花中总黄酮的量和抗氧化活性具有一致性。     

Relationship between anti-oxidant activities and doxorubicin-induced lipid peroxidation in P388 tumour cells and heart and liver in mice

1. The present study found that, compared with mouse heart and liver, P388 ascitic tumour had significantly lower superoxide dismutase (SOD) activity and that compared with the mouse liver, the heart had significantly lower SOD and catalase activities, as well as a lower glutathione content. 2. At 7.5 mg/kg, doxorubicin (DOX), a superoxide radical inducer, induced significant lipid peroxidation only in the tumour, whereas 15.0 mg/kg DOX induced lipid peroxidation in both the tumour and heart, but not in the liver. 3. Overall, the results of the present study suggest that the differential anti-oxidant activities in P388 ascitic tumour, heart and liver in mice may explain their differential responses and, hence, susceptibility to DOX-induced lipid peroxidation.     

人参皂苷抗肝纤维化作用机制研究进展

人参皂苷是一类重要的天然产物,在自然界中分布广泛,是多种药用植物中的主要活性成分,具有多种生理活性。研究发现,人参皂苷在肿瘤疾病治疗中取得很大进展,同时在抗肝纤维化方面也有显著的作用。因此人参皂苷对肝纤维化的治疗具有重要的应用价值。对人参皂苷的抗肝纤维化作用机制进行综述,以便为今后进一步的研究提供理论依据。     

黄芩总黄酮对博莱霉素致大鼠肺纤维化的干预作用及其机制研究

目的观察黄芩总黄酮对博莱霉素致大鼠肺纤维化的影响及其作用机制。方法 SD大鼠随机分为5组:对照组、模型组、泼尼松龙阳性对照(3.34 mg/kg)组、黄芩总黄酮高剂量和低剂量(50、25 mg/kg)组。大鼠气管内注射博莱霉素制备肺纤维化模型后,各给药组ig给予相应药物,每天给药1次。28 d后处死动物,观察大鼠血清中总抗氧化能力(T-AOC)、还原性谷胱甘肽(GSH)、髓过氧化物酶(MPO)的水平;取固定部位肺组织分别行HE、Masson染色,进行病理组织学检查;RT-PCR法检测黄芩总黄酮对大鼠肺组织中TGF-β1、Smad2、Smad7、α-SMA、胶原I的mRNA表达水平。结果与模型组相比,黄芩总黄酮给药组大鼠血清中T-AOC、GSH水平均升高,MPO水平显著降低;肺泡炎和肺纤维化程度明显减轻(P<0.05、0.01);TGF-β1、Smad2、α-SMA、胶原I基因表达显著降低,Smad7表达显著升高(P<0.05、0.01)。结论黄芩总黄酮对博莱霉素所致大鼠肺纤维化具有一定的治疗作用,其机制可能与抗氧化损伤、抑制炎症细胞的浸润活化及调控TGF-β1/Smad信号通路有关。     

HPLC-DAD法测定迷迭香茎和叶中11种抗氧化活性成分

目的建立HPLC-DAD同时测定迷迭香叶和茎中11种抗氧化活性成分含量的方法。方法采用Zorbax SB-Aq C18色谱柱(250 mm×4.6 mm,5μm);以甲醇(A)-磷酸二氢钾缓冲盐(B)溶液为流动相,梯度洗脱,体积流量1.0 mL/min,柱温30℃,绿原酸、咖啡酸、迷迭香酸、木犀草素、芹菜素和芫花素的检测波长为328 nm,丹皮酚、迷迭香酚、橙皮素、鼠尾草酚和鼠尾草酸的检测波长为284 nm,进样量10μL。结果绿原酸、咖啡酸、迷迭香酸、丹皮酚、迷迭香酚、橙皮素、木犀草素、芹菜素、鼠尾草酚、芫花素和鼠尾草酸分别在2.02~64.64μmol/mL,r=0.999 97;1.74~55.68μmol/mL,r=0.999 97;2.76~88.32μmol/mL,r=0.999 97;0.24~7.68μmol/mL,r=0.996 63;0.46~14.72μmol/mL,r=0.999 97;0.22~7.04μmol/mL,r=0.998 64;0.72~23.04μmol/mL,r=0.999 37;3.74~119.68μmol/mL,r=0.999 80;5.1~163.28μmol/mL,r=0.996 18;0.4~12.8μmol/mL,r=0.996 35;5.22~167.04μmol/mL,r=0.996 98内有良好的线性关系;平均加样回收率为98.1%~100.5%,RSD为0.67%~2.14%。结论该方法准确,实用性好,可用于迷迭香叶和茎中抗氧化活性成分的定性与定量分析。     

黄精药理作用研究进展

黄精为我国常用传统中药,在长江以南大部分地区广泛分布,具有补益肝肾、延年益寿等作用,是自古以来的道家养生圣药。因其含有多糖、皂苷、黄酮、木脂素、氨基酸、醌类化合物、维生素、生物碱及多种微量元素等成分,从而具有较高的药用价值和营养价值,国内各研究机构对其进行了较深入的研究,国外对其仍处于初步研究阶段。目前实验研究主要集中在黄精多糖、黄精醇、黄精皂苷提取物或黄精水提物上,以动物实验或单方和复方制剂的临床研究为主。其多种黄精制剂已广泛应用于临床,如黄精口服液、黄精茶、苁蓉精颗粒、黄精赞育胶囊、黄精精油眼罩等,发挥着不同的效用。查阅有关黄精的研究文献,对其药理作用进行全面的综合分析,多角度总结其效用价值,为黄精的深入开发与应用提供参考。     

Endoscopic biopsy of islet transplants in the gastric submucosal space provides evidence of islet graft rejection in diabetic pigs

Transplantation of islets into the gastric submucosal space (GSMS) has several advantages (e.g., avoidance of the instant blood-mediated inflammatory response [IBMIR], ability to biopsy). The aim of this study was to determine whether endoscopic biopsy of islet allografts transplanted into the GSMS in diabetic pigs can provide histopathological and immunohistochemical information that correlates with the clinical course (e.g.,, blood glucose level, insulin requirement). Islet allografts (Group1: 10,000 kIEq /kg [n = 4]; Group2: 15,000 kIEq /kg [n = 2]) were transplanted into the GSMS of diabetic pigs under immunosuppression. In Group2, the anti-oxidant, BMX-001 was applied during preservation, isolation, and culture of the islets, and at the time of transplantation. Endoscopic biopsies of the islet grafts were obtained one or 2 weeks after transplantation, and histopathological features were compared with the clinical course (e.g., blood glucose, insulin requirement). In Group1, in the absence of anti-oxidant therapy, most of the islets became fragmented, and there was no reduction in exogenous insulin requirement. In Group2, with an increased number of transplanted islets in the presence of BMX-001, more healthy insulin-positive islet masses were obtained at biopsy and necropsy (4 weeks), and these correlated with reductions in both blood glucose level and insulin requirement. In all cases, inflammatory cell infiltrates were present. After islet transplantation into the GSMS, endoscopic biopsy can provide information on graft rejection, which would be an immense advantage in clinical islet transplantation.     

维生素E对双酚A暴露的发育期雄性小鼠生殖系统及抗氧化能力的影响

目的研究双酚A(BPA)暴露对雄性小鼠生殖系统及抗氧化能力的影响,以及大剂量补充维生素E对BPA作用的影响。方法 32只4～5周龄雄性昆明小鼠随机分为3组,分别为空白对照组(玉米油灌胃0.2ml/d,n=10),BPA组(每天给予BPA 0.5mg/kg BW灌胃,n=11)和维生素E干预组(每天给予BPA 0.5mg/kg BW和维生素E 150mg/kg BW灌胃,n=11)。干预3周后处死动物,测量血和各组织抗氧化活性,并检测生殖功能指标。结果 BPA组的睾丸湿重,BPA组和维生素E干预组的精囊湿重、精囊脏器系数和精子计数显著低于空白对照组(P<0.05或P<0.01);而维生素E干预组精囊脏器系数显著高于BPA组(P<0.05);BPA组和维生素E干预组的精子畸形率显著高于空白对照组(P<0.01);BPA组精子活动度显著低于空白对照组与维生素E干预组(P<0.05)。BPA组和维生素E干预组肝脏SOD活力显著高于空白对照组(P<0.05)。BPA组血清睾酮水平低于维生素E干预组和空白对照组,但差异无显著性。结论双酚A的短期暴露对雄性小鼠的生殖系统可能产生一定抑制作用,并显示出对实验动物抗氧化能力增强;短期补充维生素E对双酚A暴露所引起的生殖系统抑制可产生一定保护作用。