高效液相色谱法测定贝那普利氢氯噻嗪片的溶出度

采用篮法,以0.1mol/L盐酸为溶出介质,温度37±0.5℃,转速100r/min,取样时间为30min;采用C18(250×4.6mm,5μm)色谱柱,以四氢呋喃-水-冰醋酸(25∶75∶0.4)为流动相,流速1.0 mL/min,柱温25℃,建立反相高效液相色谱法同时测定贝那普利、氢氯噻嗪的溶出度。结果表明,氢氯噻嗪和贝那普利的线性范围分别为0.999 2~14.99μg/mL(r=0.999 7)和0.798 4~9.581μg/mL(r=0.999 6),平均回收率分别为99.9%和100.2%。方法简便、准确,专属性强,可有效测定贝那普利氢氯噻嗪片的溶出度。     

那格列奈片溶出度测定方法

建立了那格列奈片的体外溶出度测定方法,以pH6.8磷酸缓冲液 500 mL为溶出介质,浆法,50 r/min;溶出度测定采用HPLC法。线性范围10～200μg/mL(r=0.999 8),方法的回收率为(100.2±0.514 8)％。建立的那格列奈片体外溶出度测定方法可较好控制该片质量。     

盐酸托烷司琼片溶出度方法的研究

建立盐酸托烷司琼片溶出度测定法,以0.01 mol/L盐酸溶液为溶出介质,浆法,转速50 r.min-1,检测波长为285nm。盐酸托烷司琼浓度在2.0～24.0μg.mL-1时,与峰面积比值呈良好线性,r=0.999 9(n=7),平均回收率100.2%,日内和日间RSD分别为0.62%及0.80%(n=9)。该法简便、准确,可用于该片的质量控制。     

盐酸二甲双胍缓释片处方前研究

建立盐酸二甲双胍片剂的含量测定和溶出度测定方法.采用紫外分光光度法进行片剂质量浓度、溶出度和溶解度测定,结果表明在1.150-10.260μg/mL范围内,线形关系良好,精密度和回收率符合要求.建立的方法适用于二甲双胍片剂的处方前研究.     

高效液相色谱法测定氟康唑胶囊的溶出度

利用高效液相色谱法建立了测定氟康唑胶囊溶出度的方法.采用vp-ODS(150 mm×4.6 mmi.d)色谱柱,流动相为pH7.0的磷酸盐缓冲液-甲醇(体积比55∶45),流速1.0 mL/min,检测波长为261 nm,进样体积10μL,柱温为室温.氟康唑在0.02~1.00 g/L内,峰面积和质量浓度呈良好线性关系(r=0.9999),最低检出限为10 ng,方法精密度RSD为0.28%(n=6),平均回收率为99.08%(n=9).该方法准确,简单,灵敏,可用于该制剂溶出度的测定.     

光纤传感过程监测格列齐特片(Ⅱ)溶出度

建立用光纤药物溶出度实时测定仪考察格列齐特片溶出过程的方法.结果 表明格列齐特在15.6~97.2 μg/mL的浓度范围内,吸收度和浓度的线性关系良好,与UV方法比较无显著性差异(P ＞ 0.05),该法用于检测格列齐特片溶出过程,显示药物实时溶出曲线图,获得的数据信息完整,反映了药物在体外溶出的全过程,且具有方便、快捷等优点.用光纤溶出度实时测定仪监测市售格列齐特片的溶出过程,该药品溶出度符合国家药典的要求.     

盐酸沙格雷酯有机溶剂残留量的GC法测定

为了建立气相色谱法测定盐酸沙格雷酯中丙酮、乙醇、四氢呋喃、乙腈、甲苯5种有机溶剂残留的方法,采用内壁涂有PEG-20M的毛细管柱为色谱柱,氢火焰离子化(FID)检测器为检测器,载气为氮气,柱温70℃,汽化室150℃,检测器250℃.在以上色谱条件下,丙酮、乙醇、四氢呋喃、乙腈、甲苯均能得到良好的分离,溶剂对测定无影响,在测试浓度范围内,峰面积与浓度线性关系良好(r>0.991),进样精密度实验的RSD值均小于5.0%,丙酮、乙醇、四氢呋喃、乙腈、甲苯最低检测限分别为0.3μg/mL、0.4μg/mL、0.2μg/mL、0.4μg/mL、0.9μg/mL.本方法简单、准确、灵敏度高,重现性好,可用于该药的有机溶剂残留的测定.     

气相色谱法测定小金丸中麝香酮的含量研究

采用KB-50毛细管柱(30.0 m×0.25 mm,0.25μm),以N2为载气,检测器为氢火焰离子化检测器(FID),检测器温度为260℃,进样口温度250℃,研究建立了小金丸中麝香酮的程序升温气相色谱测定法.考察了不同的色谱柱温,分别选取了3、5、8℃/min 3个不同升温速率进行研究,并进行方法学考察.结果表明:麝香酮进样量在0.083 12~0.997 50μg范围内与峰面积线性关系良好,r=0.999 3,平均回收率为97.03%.该方法准确可信、简便、快速,可用于小金丸的质量控制.     

普卢利沙星片的质量标准研究

采用高效液相色谱法(HPLC)测定普卢利沙星片中普卢利沙星的含量及有关物质。使用紫外-可见分光光度法测量片剂溶出度,作为普卢利沙星片的质量控制标准的一种新方法。在片剂的含量测定中,3种浓度下回收率均良好,RSD=0.015%,空白辅料对主药测定无干扰。本品3批有关物质均小于1.0%;溶液浓度在(1～10)g/mL范围内,与吸光度值线性关系良好,A=0.097 8C+0.002,相关系数r=1。本品在45 min内溶出量达85%以上。建立的普卢利沙星片的含量、有关物质和溶出度测定方法简便、快速、准确。     

阿奇霉素分散片溶出度测定方法研究

对阿奇霉素分散片的溶出度测定方法进行了研究，采用比色法测定阿奇霉素的溶出百分率．平均回收率为99．13％(n=9)，在149．76μg／mL～349．44μg／mL质量浓度范围内线性关系良好(r=0．9997)。该方法简便、可靠。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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