槲寄生总生物碱的提取工艺研究

优选提取槲寄生中总生物碱的最佳提取工艺.以离子交换树脂法提取,采用正交试验,以槲寄生中总生物碱的收得量为考察指标,优化总生物碱的提取工艺.结果表明,最佳提取工艺为盐酸渗漉液质量分数为0.2%,渗漉液的用量是药材的15倍,离子交换树脂的用量是药材的0.5倍,氨水用量是150 m L/mg药材.该提取工艺可以有效地提取出槲寄生中的生物碱,提取工艺合理、高效、经济.     

离子交换法提取D-对羟基苯甘氨酸

研究了离子交换树脂提取D-对羟基苯甘氨酸的方法,包括树脂的筛选,吸附条件和洗脱条件的确定.     

甘蔗糖蜜发酵液分离提纯L-赖氨酸的研究

本文主要研究赖氨酸发酵液的预处理,离子交换树脂提取,洗脱和脱色方面的工艺条件。甘蔗糖蜜发酵液经硫酸或盐酸酸化,离心沉降,澄清液在PH1.5—2.0上离子交换树脂柱,732NH4+型树脂离子交换吸附量为80—85克/升树脂,洗脱回收率在95%以上。用活性炭脱色,所得精制品纯度达98.5%,符合食品级标准。最后提出以732树脂提取,用氢氧化铵溶液洗脱为中心的赖氨酸提取过程的模式。     

从煤焦油洗油中提取喹啉的研究

对大孔型强酸性阳离子交换树脂提取煤焦油洗油中的喹啉进行了初步探讨.选用D001-CC型、D61型和001-7型3种树脂作比较试验.在静态试验条件下,3种树脂的吸附平衡时间为24～25 min;3种树脂吸附效能大小为D001-CC＞D61＞001-7; D001-CC型树脂的实际交换容量为理论值的1.2～1.3倍.通过动态离子交换柱的正交试验,确定动态条件下最佳提取组合为:树脂填料层高度为12 cm,液体流速为2.0 mL/min,离子交换树脂为D001-CC型. 喹啉富集液中的喹啉浓度可达39.5%,喹啉从洗油中的回收率达到85.54%.     

从柑桔皮中提取果胶的研究--优化工艺条件探讨

以柑桔皮为原料,采用酸法提取、真空浓缩、乙醇沉淀工艺提取果胶;优化工艺条件为水料比为201、pH值为2.1、提取温度为75℃、提取时间为60min,真空浓缩后体积约占原液的10%,混合后乙醇浓度约为50%;按最后确定的提胶工艺方案做了试验,结果为20g干柑桔皮产果胶3.58g,产率为17.9%;实验表明所选工艺条件是可行的,果胶质量符合要求,其产率也是理想的,对果胶生产有重要意义.     

湿苹果渣中提取果胶工艺条件的研究

以苹果加工利用后的湿苹果渣为原料,采用酸液提取、盐析沉淀法制取果胶.通过对酸解条件、盐析条件和脱盐条件的影响因素进行分析与研究,得到了提取果胶的最佳工艺条件和工艺参数.果胶的质量提取率约为1.5%,颜色为淡黄色.产品经过检验,达到QB2484-2000标准.此法将为工业化低成本生产果胶提供技术依据.     

离子交换法分解重晶石

本文讨论了用离子交换树脂分解重晶石的基本原理及方法,通过实验研究了单位重量树脂提取钡的能力与阴阳离子交换树脂重量比、矿石与阳离于交换树脂的重量比、P~H值、反应时间等各种因素的关系。确定了主要工艺条件。证明用离子交换树脂提取重晶石中的钡,生产钡盐是可行的。     

毛樱桃果胶的提取及含量测定

目的探讨毛樱桃果浆中果胶的提取工艺及含量测定,考察不同条件对果胶提取的影响.方法采用酸性水解乙醇沉淀法制取果胶;采用正交设计L_9(3~3)方法优化毛樱桃果胶的提取工艺;采用咔唑比色法测定其果胶含量.结果优选的毛樱桃最佳工艺条件:料液比为1∶6,提取温度为90℃,提取时间为2 h,毛樱桃果浆中果胶含量为4.613%.结论毛樱桃提取果胶具有可行性.     

由桔皮提取果胶工艺的研究

果胶广泛用于食品生产,它可以从多种农产品废料中提取,但以桔皮提取的果胶的质量较好.优质固体果胶有较大的胶凝强度,是生产优质糖果的重要原料.作为原料的桔皮,大部分当作废物没有利用,据初步估算,用桔皮提取果胶在经济上是可行的.由桔皮提取果胶工艺的研究分为三个步骤:小试,中试,确定工艺.一、小试结果用400克干枯皮,加800ml水,在具有搅拌器的反应器中进行水解反应,按实验设计法优选反应条件,确定为:pH=1.5～2.5,温度为80～85℃,反应时间约为0.5h.反应后,优质果胶溶于水中,经过滤,滤液中加入乙醇,即有棕色沉淀析出.过滤得到湿果胶,经洗涤、干燥后可以获得优质果胶.     

从菜西瓜中提取果胶的最佳工艺研究

为确定从菜西瓜中提取果胶的最佳工艺条件 ,以山西省临汾市菜西瓜为材料 ,采用酸法进行了提取果胶的试验研究。正交试验结果表明 :在萃取时间为 4 5min的前提下 ,从瓜瓤中提取果胶最佳工艺条件为加水量为原料重量的 4倍 ,85℃下 ,添加原料重量 0 3%的多聚磷酸钠 ,果胶得率可达 2 0 3% ;从外果皮中提取果胶 ,加水量为原料重量的 4倍 ,75℃下 ,添加原料重量 0 7%的多聚磷酸钠 ,果胶得率可达 2 98%。     

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     

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     

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

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