高效液相色谱法测定苯并三嗪-1,4-二氧化物衍生物SR-H22及其有关物质

建立了测定苯并三嗪-1,4-二氧化物衍生物SR-H22的含量及有关物质的高效液相色谱方法。采用Dikma Diamonsil C_(18)(250 mm×4.6 mm,5.0μm)色谱柱;流动相A为乙腈,流动相B为水;流速:1.0 m L·min~(-1);等度洗脱,A-B(25∶75,V/V),检测波长为243 nm;进样体积:10μL。在上述色谱条件下,各杂质及各降解产物均可与SR-H22主峰良好分离,HPLC测定的线性范围为0.1~1.5μg(r=0.999 8),方法中仪器精密度、日内精密度、日间精密度及重复性的RSD均小于2%。采用HPLC测定SR-H22含量及有关物质,方法简便,结果准确可靠。     

高效液相色谱法同时测定安神补脑液中淫羊藿苷和二苯乙烯苷的含量

建立了同时测定安神补脑液中淫羊藿苷和二苯乙烯苷含量的方法。采用高效液相色谱法(HPLC),迪马DiamonsilTMC18色谱柱(4.5 mm×250 mm,5μm),以乙腈-水为流动相,梯度洗脱,检测波长为350 nm,流速为1.0 mL/min,柱温为30℃。淫羊藿苷质量浓度为1.07~9.63μg/mL范围内与峰面积线性关系良好(r=0.999 5);平均加样回收率为102.2%,RSD为2.7%。二苯乙烯苷质量浓度为10~90μg/mL时与峰面积线性关系良好(r=0.999 8);平均加样回收率为99.72%,RSD为2.3%。该方法精密度高,重复性好,可用于安神补脑液的质量控制。     

高效液相色谱法测定帕布昔利布含量

为建立帕布昔利布(PD)含量测定方法,采用高效液相色谱法,色谱柱为Agilent HC C_(18)(250mm×4.6mm,5μm),流动相为乙腈-水(二者体积比为300∶700,含0.1%(体积分数)三氟乙酸),流速为1.0 mL/min,按照等度洗脱,进样量为10μL,检测波长为234nm,柱温为40℃。结果表明:主药与各杂质之间分离度良好;帕布昔利布质量浓度在50~150μg/mL范围内与峰面积线性关系良好,r为0.999 5;仪器精密度、中间精密度、稳定性试验的RSD值小于2.0%;帕布昔利布回收率为100.0%,RSD值为0.8%(n=9)。本方法可以准确快速测定PD含量,有效排除其他外界因素的影响,为帕布昔利布原料药含量测定提供新的参考。     

HPLC法同时测定小花鬼针草中3种黄酮类成分含量

建立了HPLC法同时测定小花鬼针草中芦丁、金丝桃苷和槲皮苷含量的方法。采用Diamonsil C18色谱柱(4.6 mm×250 mm,5μm),流动相为乙腈-0.2%冰醋酸梯度洗脱,流速为1 mL/min;检测波长为360 nm。结果表明,芦丁、金丝桃苷和槲皮苷在0.50~12.50μg/mL(r=0.999 9)、0.49~12.35μg/mL(r=0.999 8)、0.42~10.55μg/mL(r=0.999 5)范围内线性良好,平均回收率为99.37%(RSD=0.56%)、99.35%(RSD=0.57%)、99.68%(RSD=0.56%)。该方法简便、准确、重现性好,可用于同时测定鬼针草中3种黄酮成分的含量。     

高效液相色谱法测定地塞米松棕榈酸酯注射液中的有关物质

为建立高效液相色谱法测定地塞米松棕榈酸酯注射液(乳剂)中的有关物质和含量检测的有效方法,采用ODS-C18色谱柱(4.6×250 mm,5μm),流动相为乙腈:水(梯度洗脱),流速1.0 mL·min-1,检测波长240 nm,柱温50℃。结果使有关物质地塞米松与主峰得到良好分离,分离度大于2,在0.25~16.0μg/mL范围内线性关系良好。地塞米松浓度与峰面积之间呈现良好线性关系,r2=0.999 9(n=8),回收率均在84.7%~97.9%之间,RSD(%)小于2.0%。地塞米松棕榈酸酯在20.04~400.8μg/mL间呈现良好线性关系,r2=0.999 3(n=6),回收率均在99.2%~100.9%之间,RSD(%)小于2.0%。该方法简便、准确、专属,可用于该注射液的质量控制。     

HPLC法同时测定清心明目上清片中栀子苷、连翘苷、黄芩苷和盐酸小檗碱的含量

目的:建立HPLC同时测定清心明目上清片中四种成分(栀子苷、连翘苷、黄芩苷和盐酸小檗碱)含量的方法.方法:色谱柱.AglientTC-C18(4.6mm×250mm,5μm),流动相为乙腈(A)-0.2%磷酸溶液(B),梯度洗脱程序依次为.0~10 min 18%B,10~12 min 20%~30%B,12~14 min30%~16%B,14~20 min 16%~28%B,20~30 min 28%~65%B,30~40 min 65%~80%B,流速0.9 mL·min-1,柱温为25℃,检测波长分别为238 nm(栀子苷和连翘苷)、275nm(黄芩苷和盐酸小檗碱).结果:栀子苷、连翘苷、黄芩苷和盐酸小檗碱分别在0.031 1~0.622 2μg(r=0.999 6),0.533 3~8.000μg(r=0.999 6),0.080 0~1.600 0μg(r=0.999 5),0.115 6~1.155 6μg(r=0.999 4)范围内线性关系良好,平均加样回收率分别为98.4%、98.3%、97.1%、98.2%.结论:本法操作简便、精密度高、重现性好,适用于同时测定清心明目上清片中栀子苷、连翘苷、黄芩苷和盐酸小檗碱的含量.     

RP-HPLC法同时测定通窍鼻炎片中5种成分

建立RP-HPLC法同时测定通窍鼻炎片中花椒毒酚、水合氧化前胡素、白当归素、欧前胡素和异欧前胡素的含量。Agilent TC-C18色谱柱(4.6 mm×250 mm,5μm),流动相为0.2%甲酸水(A)—乙腈(B),梯度洗脱(0~42 min,22%B;43~72 min,50%B);柱温30℃;进样量50μL,流速1.0 m L/min;检测波长为254 nm。花椒毒酚在0.163~5.216μg/m L(r2=0.999 8),水合氧化前胡素在0.699~22.356μg/m L(r2=0.999 5),白当归素在0.375~11.988μg/m L(r2=0.999 8),欧前胡素在1.617~51.744μg/m L(r2=0.999 3),异欧前胡素在0.869~27.784μg/m L(r2=0.999 8)质量浓度范围内与峰面积具有良好的线性关系,平均回收率均大于95%。该方法准确可靠,可行性及重复性良好,可作为通窍鼻炎片的质量控制方法。     

HPLC法同时测定复方盐酸环丙沙星滴耳液两组分的含量

建立同时测定复方盐酸环丙沙星滴耳液中盐酸环丙沙星与醋酸地塞米松含量的方法.采用HPLC法.色谱柱为W aters C18柱(250 mm×4.6 mm,5μm),流动相为pH=2.6的磷酸水溶液-甲醇(30:70,V/V),检测波长为240 nm.结果显示盐酸环丙沙星在42.24~98.56μg.mL-1范围内浓度与峰高线性关系良好,r=0.999 7,平均回收率为100.2%,RSD=0.50%;醋酸地塞米松在15.17~35.39μg.mL-1范围内浓度与峰高线性关系良好,r=0.999 5,平均回收率为100.0%,RSD=0.75%.因此HPLC法可用于同时测定复方盐酸环丙沙星滴耳液中环丙沙星与醋酸地塞米松的含量.该法简便、灵敏、准确.     

高效液相色谱法测定盐酸阿罗洛尔有关物质

建立了盐酸阿罗洛尔有关物质测定方法.采用高效液相色谱法,色谱柱为Agilent HC C18(250mm×4.6mm,5μm),流动相A为甲醇-水(体积比为8∶2),流动相B为磷酸盐缓冲液(pH调节为5.5),梯度洗脱,流速为0.8mL/min,进样量10μL,检测波长312nm,柱温为30℃.结果表明:主药与各有关物质、各有关物质之间分离度良好,各有关物质均能有效检出;盐酸阿罗洛尔及有关物质A,B,C质量浓度分别为0.052~20.006,0.102~22.331,0.061~19.865,0.065~18.308μg/mL时与各自峰面积呈良好线性关系;仪器精密度、中间精密度、稳定性试验的RSD不超过2.0%;各有关物质测定平均回收率为99.32%~101.96%,RSD为0.54%~0.89%(n=9).     

RP-HPLC法测定北五味子中6种木脂素类成分

采用RP-HPLC法同时测定北五味子中6种木脂素类成分.色谱柱为Agilent ZORBAX SBC18(5μm,4.6×150 mm),流动相为甲醇-水溶液梯度洗脱,检测波长为254 nm,柱温为25℃.结果表明:五味子甲素在40.4~600.0μg/m L(r=0.999 8)、五味子乙素在42.0~420.0μg/m L(r=0.9999)、五味子丙素在15.8~118.8μg/m L(r=0.999 5)、五味子醇甲在10.0~160.0μg/m L(r=0.9999)、五味子醇乙在15.5~388.0μg/m L(r=0.999 5)、五味子酯甲在16.3~408.0μg/m L(r=0.999 9)范围内峰面积与对照品质量浓度呈良好的线性关系(n=6).6种成分的加样回收率均高于98%,RSD值小于3%本方法简便,准确,快速,重现性好,可用于北五味子中有效成分的定量分析.     

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