明目止痛片质量标准的研究

建立明目止痛片的质量标准。采用TLC法对黄连、大黄、菊花、麦冬及栀子进行鉴别,采用HPLC法测定制剂中黄芩苷的含量。结果表明,薄层鉴别的色谱斑点清晰,阴性对照无干扰。黄芩苷进样量在0.240 8~0.722 4μg范围内线性关系良好(r=0.999 5)。平均加样回收率为97.7%,RSD为1.88%(n=5)。所建立的方法简单准确,可较好地控制明目止痛片的质量。     

中成药妇科养坤丸质量标准研究

目的建立妇科养坤丸的HPLC定量和TLC定性指纹图谱．方法用TLC对妇科养坤丸中主药木香、香附、白芍、延胡索进行定性鉴别;用HPLC测定妇科养坤丸中黄芩苷的质量分数．结果TLC特征图谱能很好地检测本品的质量;HPLC测得本品中的特征图谱,可确定黄芩苷的质量分数在0．1352～1．3520ug与峰面积呈良好的线性关系,r=0．9998,平均回收率为97．50％（n=5）,RSD为1．9％．结论建立的特征图谱能准确、快速地进行定性、定量检测,可用于该制剂质量控制．     

Baicalin inhibits high glucose-induced apoptosis of mouse glomerular mesangial cells via miR-141/Sirt1 signaling pathway

AIM:To investigate the therapeutic mechanism of baicalin for diabetic nephropathy involving microRNA-141 (miR-141)/silent information regulator 1 (Sirt1) signaling pathway. METHODS:Mouse glomerular mesan-gial cell line SV40-MES-13 was treated with high glucose (HG, 25 mmol/L glucose) to establish diabetic nephropathy cell model. Baicalin at 100 μmol/L was used to treat glomerular mesangial cells. qPCR and Western blot were performed to determine the expression levels of miR-141 and Sirt1. The regulatory relationship between miR-141 and Sirt1 was detected by dual-luciferase assay. The apoptosis of glomerular mesangial cells was analyzed by flow cytometry. RESULTS:Compared with control group, the cells treated with HG showed increased levels of miR-141 and apoptosis, and Sirt1 expression was decreased (P<0.01). Baicalin and miR-141 inhibitor suppressed the HG-induced effect on the levels of miR-141, Sirt1 and apoptosis. Knockdown of Sirt1 expression reversed the effect of miR-141 inhibitor on the levels of miR-141, Sirt1 and apoptosis. Over-expression of miR-141 reversed the effect of baicalin on the glomerular mesangial cells treated with HG. Up-regulation of Sirt1 abolished the effect of miR-141 over-expression on the glomerular mesangial cells. CONCLUSION:Baicalin inhibits the apoptosis of mouse glomerular mesangial cells via miR-141/Sirt1 signaling pathway, thus attenuating diabetic nephropathy.     

鱼腥草芩蓝口服液指纹图谱研究

以鱼腥草芩蓝口服液为研究对象,摸索不同流动相、溶剂、柱温、流速条件下的色谱图,通过中药指纹图谱相似度软件评价系统,计算相似度等相关参数,最终确定一个HPLC指纹图谱条件：Thermo C18色谱柱（250 mm×4.6 mm,5 μm）,以甲醇（A）-1 %磷酸水溶液（B）为流动相梯度洗脱,柱温25 ℃,体积流量1.0 mL·min-1,检测波长为240 nm。本研究建立的方法可靠,简便易行,为全面控制鱼腥草芩蓝口服液的质量提供科学依据。     

超微粉碎对黄连解毒汤中黄芩苷溶出的影响

目的:比较普通粉碎和超微粉碎对黄连解毒汤中黄芩苷溶出量的影响。方法:用HPLC法测定。色谱柱为Nova-PakC18(3.9mm×150mm),流动相为甲醇-重蒸水-磷酸(47∶53∶0.2),流速为1ml/min,柱温为30℃,波长为280nm。结果:超微粉碎可增加黄芩苷的溶出,在超声提取下超细微粉中黄芩苷溶出量比细粉提高32.5%;而在简化提取(开水冲搅)下,超细微粉中黄芩苷溶出量比细粉提高51.15%。结论:超微粉碎没有改变黄连解毒汤固有的药效学物质,但提高了黄连解毒汤中黄芩苷溶出量。     

Radiosensitizing effect of baicalin on human cervical carcinoma HeLa cells

AIM: To investigate the effect of baicalin on the radiosensitization of HeLa cells. METHODS: The cell activity was determined by MTT assay. The radiosensitivity of HeLa cells was detected by colony formation assay. The cell cycle was analyzed by flow cytometry. The protein levels of Akt, p-Akt, Bad and p-Bad were examined by Western blot. RESULTS: The cell growth of the HeLa cells was inhibited by baicalin dose-dependently and IC₅₀ was 43.65 mg/L. The results of colony formation assay showed that combination of 8 mg/L baicalin and radiotherapy further improved survival curve and decreased the value of D0 and Dq, as compared with radiotherapy alone (P<0.05). Furthermore, baicalin enhanced the effect of radiotherapy on cell cycle, as evidenced by the increase in cell percentage in G₂/M phase (P<0.05). Additionally, after incubation with baicalin, radiotherapy-induced phosphorylation of Akt and Bad were further augmented (P<0.05). CONCLUSION: Baicalin augments radiosensitivity of HeLa cells through the inhibition of cell cycle transition and activation of PI3K/Akt signaling pathway.     

In vitro metabolism in Sprague-Dawley rat liver microsomes of forsythoside A in different compositions of Shuang-Huang-Lian

Shuang–Huang–Lian (SHL), a traditional Chinese formula containing Lonicerae japonicae flos (LJF), Scutellariae radix (SR) and Forsythiae fructus (FF), is commonly used to treat acute upper respiratory tract infection, acute bronchitis and light pneumonia. Forsythoside A is one of the main active ingredients in Forsythiae fructus, a key herb in SHL. In the present study, effects of different compositions in SHL on the in vitro metabolism in Sprague–Dawley rat liver microsomes of forsythoside A were investigated. The observations from Sprague–Dawley rat liver microsomes in the presence of β-NADPH or UDPGA that forsythoside A may be the substrates of CYP3A4, CYP2C9, CYP1A2, UGT1A6, UGT1A3, UGT1A1 and UGT1A9; Chlorogenic acid may be the substrates of CYP3A4, CYP2C9, CYP1A2, CYP2C19, UGT1A6, UGT1A3 and UGT1A1; Baicalin may be the substrates of CYP3A4, CYP2C19, CYP1A2, UGT1A9, UGT1A1 and UGT1A3; Baicalein may be the substrates of CYP3A4, CYP2E1 and UGT1A6. It was also found that the residue of forsythoside A in SHL, FF + LJF and FF + SR was greatly increased compared with that in FF in Sprague–Dawley rat liver microsomes in the presence of β-NADPH or UDPGA, which indicated that the metabolism of forsythoside A in SHL may be influenced by chlorogenic acid in LJF acting on the CYP3A4, CYP2C9, CYP1A2, UGT1A6, UGT1A3 and UGT1A1; baicalin in SR acting on the CYP3A4, CYP1A2, UGT1A9, UGT1A1 and UGT1A3; baicalein acting on the CYP3A4 and UGT1A6 respectively.     

高效液相法测定利咽爽颗粒中黄芩苷的含量

目的建立高效液相色谱法测定利咽爽颗粒中黄芩苷含量方法。方法采用十八烷基键合硅胶色谱柱(250mm×4.6 mm,5μm),以甲醇-0.2%磷酸溶液(45∶55)为流动相,流速为1.0mL/min,检测波长为280nm。结果黄芩苷的线性范围为(0.20-1.20μg)(r=0.9998),平均回收率(n=6)为100.14%(RSD=0.42%)。结论本方法简单、迅速、可靠。     

黄芩苷-姜辣素-海藻酸钠-蔗糖酯复合保鲜膜在鸡蛋保鲜中的应用

为研究黄芩苷-姜辣素-海藻酸钠-蔗糖酯复合保鲜膜最佳配方,以新鲜鸡蛋为试验对象,在单因素试验的基础上,采用响应面分析法对黄芩苷、姜辣素、海藻酸钠、蔗糖酯复合保鲜防腐剂配方进行优化,并将其应用于鸡蛋防腐保鲜试验。结果表明,复合保鲜防腐剂配方为黄芩苷浓度1.90%、姜辣素浓度2.70%、海藻酸钠浓度1.45%、蔗糖酯浓度2.00%。在此条件下,37℃下保藏25天后,鸡蛋哈夫单位为69,蛋黄指数为0.38,失重率为4.8%,表明该复合保鲜膜具有良好的保鲜效果。所研制的复合生物保鲜膜具有绿色、天然、优质等特点,能够作为鸡蛋贮藏和保鲜的技术参考。     

高效液相色谱法测定兽药龙胆泻肝散中龙胆苦苷、栀子苷和黄芩苷的含量

建立测定兽药龙胆泻肝散中龙胆苦苷、栀子苷和黄芩苷的高效液相色谱分析方法。样品经50%甲醇水溶液超声提取,C18色谱柱分离,254 nm波长下检测,外标法定量。龙胆苦苷在0.400～3.203μg范围内线性关系良好,r=0.9998,平均回收率为91.5%,RSD为0. 77%,栀子苷在0.252～2.012μg范围内线性关系良好,r=0.9999,平均回收率为90.2%,RSD为1. 58%,黄芩苷在0.500～3.981μg范围内线性关系良好,r=0.9999,平均回收率为94.6%,RSD为1.74%。该方法简单、快速、准确度高、重复性好,可以用于兽药龙胆泻肝散的质量控制。