聚己内酰胺分离纯化缩宫素粗品研究

通过考察在不同乙腈浓度等度洗脱条件下,缩宫素在聚酰胺色谱柱上的保留,研究了聚酰胺对缩宫素的分离机理,建立并优化了聚酰胺对缩宫素粗品的粗分离方法,并与反相C18分离效果进行对比.缩宫素在聚酰胺色谱柱上的保留呈现典型的氢键吸附和疏水作用吸附共同作用的混合吸附模式;在优化的纯水等度洗脱分离缩宫素粗品的条件下,样品栽量可达9.38 mg/mL介质,纯度可达65.8%,回收率72.1%.研究结果表明,聚酰胺纯水等度洗脱分离缩宫素粗品有着与传统反相C18分离基本相当的效果,与反相C18相比还有着样品栽量高、经济、安全和环保等优点.     

鲢鱼（Aristichthys nobilis）鱼精蛋白的纯化和鉴定

采用Sephadex G-50凝胶层析、GM-Sepharose CL 6B离子交换层析及反相高压液相色谱等步骤从鲢鱼鱼精蛋白的粗品中分离得到一种具有抗菌活性的蛋白质。经SDS－PAGE及生物质谱鉴定,该蛋白质为单一组份,分子量为13331.9.Da。该蛋白分子中碱性氨基酸总量为33．4％,N－末端序列为NH2－Pro-Gln-Arg-His-Lys。     

葛根素的纯化分离工艺研究

以葛根素为目标提取物考察了天然活性物质的色谱分离过程,通过理论分析,综合考虑各主要影响因素,经多次实验,得出提纯葛根素的优化工艺.结果表明,葛根黄酮浸膏用AB-8型大孔吸附树脂色谱分离,采用水洗、质量分数分别为10%乙醇洗及30%乙醇洗的梯度洗脱方式,收集30%乙醇洗出液,经真空浓缩、干燥,可得纯度不低于70%的葛根素,结果与小试基本吻合.     

硫代葡萄糖苷的HPLC-MS分离鉴定研究

从菜籽中提取硫苷,经弱阴离子交换剂DEAE Sephadex A-25做预处理,得到硫苷提取液.经反相离子对液相色谱确定分离条件,采用液相色谱-电喷雾接口-质谱联用,再经紫外扫描进一步确证,同时分离鉴定了菜籽中三种类型的硫苷.     

高效液相色谱测定乳液和化妆水中芍药苷和葛根素的含量

建立了高效液相色谱（HPLC）检测乳液和化妆水中芍药苷和葛根素的方法.样品经过甲醇超声提取,以质量分数为0.1%磷酸水溶液-乙腈洗脱,经C₁₈反相色谱柱分离,二极管阵列检测器（DAD）检测,计算出2种草药成分含量.在最优化条件下,该方法对芍药苷和葛根素的相应线性范围在0.2~10.0μg·mL^-1,在232 nm和250 nm处紫外吸收强度具有良好的线性关系,相关系数（R²）大于0.999.该方法的回收率在90.4%~103.9%之间,相对标准偏差（RSD）在1.53%~2.37%之间,芍药苷和葛根素在乳液和化妆水中的方法检出限分别是2 mg·kg^-1和8 mg·kg^-1.该方法适合快速、高效、准确测定乳液和化妆水中芍药苷和葛根素的含量.     

基于色谱分析的葛根异黄酮快速检测方法

研究了分析葛根中葛根素和大豆苷含量色谱法的各种条件,包括TLC中展开剂与显色方法的选择、HPLC色谱分离条件及其检测特点、MEKC色谱分离条件及其检测特点等,优选出TLC,HPLC和MEKC的最佳色谱分离条件,并与葛根药典检测方法进行比较.结果表明:MEKC检测葛根素的准确性和精密度比HPLC略低,对大豆苷的灵敏度较差,但由于其具有机溶剂消耗小、出峰时间更短、与环境友好的突出特点,值得进一步探讨;TLC能快速鉴别葛根素、大豆苷等异黄酮物质;HPLC中葛根素和大豆苷的检测限低、检测范围宽,且稳定性、准确性和精密度较高.基于优化条件下的TLC-HPLC法能实现对葛根中葛根素和大豆苷的定性和定量快速准确检测.     

膜法分离纯化葛根素的实验研究

采用陶瓷膜技术过滤粗葛根素溶液,渗透通量为200~350 L.h-1.m-2。采用GH4040型超滤膜处理微滤渗透液,在37℃和1.50 MPa下超滤渗透通量可以达到13.02 L.h-1.m-2,葛根素的截留率约为87%。采用膜技术分离纯化葛根素具有良好的发展前景。     

醋酐法新工艺生产奥克托今／黑索今中废水的分析

用网状树脂GDX-104吸附废水中的有机污染物,然后用薄层色谱分离。薄层色谱的展开系统为:二氯甲烷/乙腈/甲醇/冰醋酸(40/1/4/0.2).分离得到的纯品用红外、质谱和色谱定性.实验表明废水中含有HMX,RDX,SEX和1.5-二硝酰氧基-2,4-二硝基-2,4-氮杂戊烷等化合物.应用反相高效液相色谱方法定量测定废水中化合物.使用的固定相为GYQG-C_(18)H_(37)(5μm),流动相为水/甲醇/乙腈(70/10/20)。     

甜叶菊化学成分及其甜度的研究

以工业化的提取分离工艺从甜叶菊干叶中分离提纯得到了甜菊糖苷粗品;利用正相硅胶层析柱以及葡聚糖凝胶、十八烷基硅烷键合硅胶、聚苯乙烯树脂等反相层析柱,分离纯化甜菊糖苷粗品得到5个化合物;再利用薄层层析色谱,质谱,核磁共振等分析手段对所得各单体进行了结构鉴定。结果表明分离得的5种化合物分别为6-羟基-11（β-D-吡喃葡萄糖基）-2-十二酮（-hydroxy-11-(β-D-glucopyranosyl)-2-cyclododecanone,Ⅰ）、莱鲍迪A苷（rebaudioside A,Ⅱ）、莱鲍迪B苷（rebaudioside B,Ⅲ）、莱鲍迪M苷（rebaudioside M,Ⅳ）和葡萄糖（glucose,Ⅴ）,其中单体Ⅰ为新的化合物。利用甜度定量预测模型对化合物Ⅰ、Ⅱ、Ⅲ、Ⅳ进行甜度分析,其甜度分别为蔗糖的113.6、225.0、325.0、29.4倍。     

亮叶杨桐叶中山茶苷A对照品的制备及鉴定

为了研究从亮叶杨桐(Adinandra nitida Merr.ex Li)叶中制备山茶苷A对照品的方法,利用硅胶柱层析、重结晶和反相制备高效液相色谱对亮叶杨桐乙醇提取物进行分离纯化,以HPLC对山茶苷A进行纯度检查和含量测定,并通过各种波谱手段等对其进行结构确证.结果从亮叶杨桐叶分离、纯化出山茶苷A对照品,质量分数＞99.0％.该方法制备出的山茶苷A对照品符合中药化学对照品的相关要求,可以作为亮叶杨桐药材和含亮叶杨桐成药质量控制,以及中药药效物质基础用的化学对照品.     

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.     

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     

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

正~~     

Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has