分光光度法测定蒙药材接骨木中盐酸小檗碱的含量

采用回流和超声波两种方法对蒙药材接骨木中盐酸小檗碱进行提取,并用分光光度法测定盐酸小檗碱的含量,检测波长426 nm.回归方程为：Y=0.00393＋1.28929X（mg/10 ml）r=0.99992;盐酸小檗碱浓度在0.099-0.796 mg/10 ml范围内与吸光度呈线性关系,平均回收率分别为：回流法96.19%;超声波法102.69%.实验结果表明,超声波提取法较回流提取法提取率高.分光光度法简便快速,适用于接骨木中盐酸小檗碱的含量测定.     

液相色谱法同时测定芩连片中芍药苷、黄芩苷、盐酸巴马汀和盐酸小檗碱的含量

研究并建立了液相色谱法同时测定芩连片中芍药苷、黄芩苷、盐酸巴马汀和盐酸小檗碱含量的新方法.实验条件为Agilent ZorbaxSB—C_(18)柱(250 mm×4.6 mm,5μm),乙腈-0.05%磷酸溶液.梯度洗脱.检测波长为0～8.5 min 230 nm,8.5～23 min 280 nm和23～30 min 346nm.流速1.0 mL/min.芍药苷、黄芩苷、盐酸巴马汀和盐酸小檗碱线性范围分别为3.87～38.72 mg/L、4.18～41.80 mg/L、1.62～16.20 mg/L、2.10～21.00mg/L.应用该法测定芩连片中芍药苷、黄芩苷、盐酸巴马汀和盐酸小檗碱含量.加样回收率分别为100.9%(RSD=2.7%),101.5%(RSD=0.7%),97.9%(RSD=2.0%)和102.2% (RSD=1.6%).     

β-环糊精敏化荧光法测定黄柏中盐酸小檗碱的含量

采用β-环糊精敏化荧光法测定黄柏提取液中盐酸小檗碱的含量.盐酸小檗碱是黄柏的主要提取物,与β-环糊精可以形成包合物,产生敏化荧光作用.在7.50 mg/mL β-环糊精水溶液中,选择荧光激发波长(λ_ex)345 nm,发射波长(λ_em)540 nm,工作曲线线性范围0.10～1.00μg/mL,检出限1.33 ng/mL,测得黄柏中盐酸小檗碱的含量为1.56%.此方法操作简单、准确,对中药中盐酸小檗碱的含量测定具有一定的参考价值.     

HPLC法测定清热宁肾胶囊中盐酸小檗碱的含量

采用高效液相色谱法测定清热宁肾胶囊中盐酸小檗碱的含量,其Dikma C18色谱柱(250×4.6 mm,5μm),流动相为乙腈—0.1%磷酸溶液(50∶50)(每100 mL含0.1 g十二烷基磺酸钠),流速为1.2 mL/min,柱温为30℃,检测波长为265 nm.实验结果显示:盐酸小檗碱在0.082~2.05μg范围内线性关系良好(r=0.9999),平均回收率为99.62%,RSD为1.86%(n=6),3批清热宁肾胶囊中盐酸小檗碱的含量分别为2.68mg/粒、2.76 mg/粒、2.72 mg/粒.方法操作简便、准确,重复性好.     

液相色谱法同时测定栀子金花丸中栀子苷和盐酸小檗碱的含量

研究并建立液相色谱法同时测定栀子金花丸中栀子苷和盐酸小檗碱含量的新方法.实验条件为Thermo Hypersil-C18柱(250 mm×4.6 mm,5μm),乙腈-水(含10 mmol/L SDS)梯度洗脱,流速1.0 mL/min,栀子苷和盐酸小檗碱的检测波长分别为240 nm和346 nm,柱温40℃.栀子苷和盐酸小檗碱线性范围分别为4.0~59.5 mg/L(r=0.999 0)和4.0~60.6 mg/L(r=0.999 9),平均加样回收率分别为99.8%(RSD=1.9%)和100.5%(RSD=0.8%).     

高效液相色谱法测定十味龙胆花颗粒中的龙胆苦苷和盐酸小檗碱

建立一种同时测定十味龙胆花颗粒中的有效成分龙胆苦苷和盐酸小檗碱的高效液相色谱法.样品用50%甲醇超声提取,在Zorbax SB-C18柱上分离,以含1%乙酸的甲醇-水为流动相进行梯度洗脱,270 nm紫外检测,外标法定量.龙胆苦苷的线性范围为0.4~40μg/mL(r=0.9993),检出限0.14μg/mL;盐酸小檗碱的线性范围为0.15~30μg/mL(r=0.9999),检出限为0.03μg/mL;盐酸小檗碱的加标回收率为96.0%,相对标准偏差为1.8%;龙胆苦苷的加标回收率为103%,相对标准偏差为1.6%.方法简便快速,重现性好,结果准确,可用于药品十味龙胆花颗粒中胆苦苷和盐酸小檗碱的分析检测.     

荧光分光光度法测定小檗碱的含量

用荧光分光光度法测定药品中小檗碱含量,荧光检测波长,Ex=360nm,Em=414nm,工作曲线线性范围0.832~3.328mg/mL.实验选用两种药品测定其含量,在盐酸小檗碱片中回收率为98.37%(RSD=0.3%),在复方黄连素片为98.04%(RSD=0.5%).     

紫外分光光度法测定黄连中盐酸小檗碱的含量

目的:探讨黄连中盐酸小檗碱的含量测定方法,为用药提供依据。方法:应用紫外分光光度法测定含量。结果:盐酸小檗碱在浓度为0.002mg/ml～0.010mg/ml范围内,浓度与吸光度呈现良好的线性关系,线性方程为C=0.0144A-0.0001,r=0.9997,平均回收率为97.6%。结论:此法精密度较高,操作简便,稳定性、重复性好,可用于盐酸小檗碱的含量测定。     

黄柏中总生物碱的提取工艺优化

目的 通过正交法来确定黄柏总生物碱不同溶剂提取的最佳工艺.方法 以黄柏为原料,分别以水、乙醇为提取剂,提取黄柏生物碱.采用单因素试验,按照所给定的条件和生物碱含量测定方法,进行不同的提取时间、提取温度、料液比、乙醇浓度的单因素实验,考察了各因素对生物碱提取率的影响.根据单因素实验得出的显著条件,以盐酸小檗碱含量为考察指标,利用L9(33)正交实验方法优选提取工艺,确定最佳工艺条件.结果 以水为提取剂的最佳工艺条件组合是100 ℃水浴下提取次数为4次,提取时间为2.5 h,料液比1:16.提取的盐酸小檗碱含量是46.55 mg/g.乙醇为提取剂的最佳工艺条件组合是70 ℃水浴下乙醇浓度为70 %,料液比1:12,提取时间为80 min,提取次数为3次.提取的盐酸小檗碱含量是68.49 mg/g.结论 提取工艺设计合理,优选的工艺稳定可行,操作简便,提取剂为乙醇比水的提取时间短,节省能源,总生物碱提取率高32.03%.     

反相流动注射化学发光法测定盐酸小檗碱

基于盐酸小檗碱抑制磷钼钒杂多酸氧化鲁米诺产生化学发光,结合流动注射分析技术,提出了一种测定盐酸小檗碱的新方法.盐酸小檗碱在1.0×10-7～1.0×10-4 g/mL浓度范围内与化学发光分析信号呈线性关系;检出限为4×10-8 g/mL;对5.0×10-6 g/mL的盐酸小檗碱进行11次连续测定,相对标准偏差为1.2%.该方法已成功地应用于盐酸黄连素片剂中盐酸小檗碱的测定.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~