HPLC测定荞芪胶囊中格列苯脲的含量

采用高效液相色谱法测定荞芪胶囊中格列苯脲的含量.该法采用Agilent C18柱(4.6 mm×250 mm,5μm),流动相为甲醇-磷酸二氢铵溶液(磷酸二氢铵1.725g,加水300 mL溶解,用磷酸调节PH值至3.5±0.5)(62:38),检测波长230 nm,柱温为20℃.得到格列苯脲在(0.03～0.35) mg/mL范围内呈较好的线性关系(r =0.999 4, n=6) ,荞芪降糖胶囊和格列苯脲片的平均加样回收率分别为99.3%和100.2%,RSD分别为2.1%和1.7%.得到以下结论:荞芪降糖胶囊中格列苯脲的含量为1.54 mg/粒.该测定方法简便快捷,能够为糖尿病患者安全使用中成药制剂提供依据.     

高效液相色谱-串联质谱法在全氟化合物检测中的应用

全氟有机化合物(Perfluorinated compounds,PFCs)是一类新型有机污染物,具有远距离迁移性、持久性、生物积累性和毒性,不仅对生态环境造成污染,且严重影响人类身体健康,因此PFCs的研究已逐渐成为国际上环境和健康领域的研究热点。当前,针对不同浓度水平的PFCs的检测方法主要有气相色谱-质谱法(GC-MS)、高效液相色谱-质谱法(HPLC-MS)和高效液相色谱-串联质谱法(HPLC-MS/MS)。其中HPLC-MS/MS因其高灵敏度和低检出限而被广泛应用于痕量PFCs的检测。本文概述了PFCs的应用、污染及研究现状,着重介绍了HPLC-MS/MS在PFCs检测方面的应用,并对HPLC-MS/MS在PFCs检测中的应用进行了展望。     

高效液相色谱——串联质谱法检测抗流感中药方剂中化合物的研究

目的:利用高效液相色谱--串联质谱法,建立定性检测抗流感中药方剂中化合物的方法.方法:色谱条件,Kromasil C18柱(4.6mm×250mm,5μm):流动相为乙腈和0.25%甲酸水溶液,梯度洗脱,流量1.0mL/min:柱温22℃;用PDA测器记录各个色谱峰的紫外吸收光谱,色谱检测波长254nm;质谱条件:电喷雾离子源(ESI);正离子方式扫描,检测方式为一级和二级全扫描.结果:通过与对照品比较,推断克感利咽口服液含有绿原酸、栀子苷、黄芩苷、黄芩素等4种成分.结论:建立的HPLC-MS/MS方法可用于定性检测抗流感中药方剂中的黄芩苷、黄芩素、绿原酸、栀子苷、升麻苷、连翘苷、甘草苷、甘草酸铵、5-0-甲基维斯阿米醇苷、次野鸢尾黄素、胡薄荷酮等11种化合物.     

液质联用分析中药降糖制剂中掺入的西药成分

采用液相色谱-离子阱质谱联用技术检测中药降糖制剂中非法掺入的西药成分．选用MGIIC18色谱柱,以甲醇、水和甲酸（三者的体积比为80．0：20．0：0．1）为流动相,对中药降糖制剂的提取液进行液相色谱-离子阱质谱分析．通过与对照品的色谱和质谱行为比较,对中药降糖制剂-荞芪胶囊中非法掺入的合成降糖药进行定性鉴别和初步定量分析．结果表明：该荞芪胶囊中分别检测到苯乙双胍2．6mg／粒,格列本脲2．0mg／粒;液相色谱-离子阱质谱联用技术快速、准确,可作为分析检测中药降糖制剂中非法掺入合成药的有效方法．     

高效液相色谱法测定水体中的苯甲酰脲类杀虫剂残留量

建立了用高效液相色谱测定水体中6种苯甲酰脲类杀虫剂(除虫脲、灭幼脲、杀铃脲、氟铃脲、虱螨脲和氟苯脲)残留量的方法.水样采用液液萃取,以二氯甲烷为提取剂.色谱分析条件:Kromasil-100-5 C18色谱柱(250 mm×4.6 mm,粒径5μm),流动相V(甲醇)∶V(水)=80∶20,流速为1.0 mL/min,柱温为室温,紫外检测波长为260 nm.杀虫剂的质量浓度在1.0~20μg/mL范围内与色谱峰面积的线性关系良好,相关系数R2=0.997 4~1.000 0,检测限为0.09~0.26μg/mL.在蒸馏水和湖水中,6种杀虫剂3个添加浓度水平的平均回收率分别为79.62%~95.28%和75.03%~98.06%,相对标准偏差分别为0.94%~11.04%和0.60%~12.56%.该方法可用于环境水样中苯甲酰脲类杀虫剂的残留量检测分析.     

RP-HPLC法测定格列吡嗪缓释片的释放度

建立了高效液相色谱法测定格列吡嗪缓释片的释放度.采用反相高效液相色谱法.固定相为ODS C18色谱柱(5μm,4.6 mm×250 mm)以0.1 mol/L磷酸二氢钠溶液(用2 mol/L氢氧化钠溶液调节pH值至(6.00±0.05)-甲醇(55∶45)为流动相,流速为1.0 mL/min.柱温室温.检测波长为225nm.采用溶出度测定法第三法装置,以0.5%十二烷基硫酸钠溶液250 mL作为释放介质,转速为50r/min,依法操作,经2、6、10 h取样测定.当格列吡嗪在释放介质中在1.019～26.49μg/mL质量浓度范围内,峰面积与质量浓度呈良好的线性关系(r=0.999 9).证明方法结果准确,不受制剂中辅料的干扰,适用于格列吡嗪缓释片的释放度测定.     

气相色谱-离子阱串联质谱对烟草中有机磷农药残留分析条件的研究

运用气相色谱-离子阱串联质谱对烟草中20种有机磷农药残留分析条件进行研究,并分别通过全扫描、单极质谱选择离子(SIM)和二级质谱(MS/MS)3种模式比较其效果.结果显示,全扫描模式不能将20种有机磷农药的峰完全分离,而MS/MS和SIM模式在定性、定量上各具优势,因此在做样品分析时可同时通过两者进行检测,以达到最佳分析条件.     

UPLC-Q-TOF/MS法测定2,6-二叔丁基对甲酚

利用超高效液相色谱-四极杆-飞行时间质谱仪(UPLC-Q-TOF/MS),建立了对2,6-二叔丁基对甲酚测定的方法.采用色谱柱Waters ACQUITY UPLC BEH C18(2.1 mm×50 mm×1.7μm),以水和乙腈(30:70,v:v)为流动相等度洗脱,使用ESI-/APCI复合源,在全扫描模式下对2...     

超高效液相色谱-三重四极杆串联质谱法检测全血中常见安眠镇静类药物

建立了超高效液相色谱-三重四极杆复合线性离子阱质谱快速筛查确证全血中49种安眠镇静类药物.样品前处理采用固相支撑液液萃取法.色谱条件：色谱柱为Waters C18(2.1 mm×50 mm, 1.7μm),以5 mmol/L乙酸铵-(体积分数为0.1%)甲酸水溶液(A),甲醇(B)为流动相,进行梯度洗脱.在0.1～200.0 ng/mL内,49种常见药物展现出良好的线性关系(R²>0.99),最高检出限为0.1 ng/mL;最高定量限为0.5 ng/mL;全血基质中50、100、200 ng/mL 3个加标水平下回收率为65.9%～109.0%,日内精密度为2.0%～17.6%、日间精密度为2.0%～16.3%.该方法可应用于生物检材中49种常见安眠镇静物质的检测.     

液质联用法分析王老吉凉茶中的3种有效成分

建立同时测定王老吉凉茶中的绿原酸、异绿原酸C、甘草酸3种有效成分含量的超高效液相色谱-串联质谱(UPLC-MS/MS)分析方法.用Agilent Zorbax RRHD Eclipse Plus C18(50mm×2.1mm,1.8μm)色谱柱,以甲醇-0.1%甲酸的水溶液为流动相,流速为0.30mL/min.在电喷雾电离(ESI)模式下,采用的是多重反应监测模式(MRM)进行检测,绿原酸、异绿原酸C、甘草酸的线性范围分别为0.030~4.500mg/L、0.045~4.500mg/L、0.016~2.000mg/L;检出限分别为10、12、3μg/L;3种成分的加样回收率为94.7%~103%,RSD均不大于1.9%.该方法简便、准确、快速、高灵敏度,已成功地用于实际的样品分析.     

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.     

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     

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