从米糠中制取高纯度肌醇新工艺研究

研究了以米糠为原料,用离子交换树脂提纯制取高纯度肌醇的新工艺.与沉淀法相比,产品质量好,操作工艺简单:用717阴离子交换树脂直接吸附米糠酸浸液中的植酸,树脂经5%氢氧化钠溶液洗脱后,洗脱液在植酸盐浓度为20%,压力为1.5 MPa的条件下水解7～8 h,过滤并通过701、732阴阳离子交换树脂脱除色素及无机盐后结晶得到高纯度肌醇.其纯度为99.3%,熔点225～226℃,肌醇收率以米糠计为1.34%.     

离子色谱法测定米糠中植酸含量

采用微波消解技术将植酸转化为磷酸盐,然后用离子色谱法测定磷酸盐,从而获得米糠中植酸含量.实验中比较了米糠直接消解、提取液直接消解和提取液经阴离子交换处理消解的测定结果.离子色谱定量工作曲线方程为y=0.116 1x+0.650 9,相关系数为R2=0.998 0,测定结果相对标准偏差为0.68%,回收率为97.0%～102.3%,结果令人满意.     

肌醇的生产原理及工艺研究

以米糠粕为原料，提取植酸盐，加压水解制肌醇。不同的工艺过程，原料的利用率不同，本文以此为宗旨对肌醇的生产原理及工艺流程进行了详细研究，提出了理论依据和较好的操作工艺。     

肌醇生产中影响得率的几个主要因素

以米糠或淀粉废水为原料生产肌醇，影响肌醇得率的主要因素为：植酸钙镁中有机磷含量；植酸钙镁水解的程度；浓缩与精制过程中母液是否循环使用。     

阴,阳离子交换法从米糠菲汀中提取植酸

本文研究了从米糠中提取菲汀，进而用阴、阳离子树脂交换法提取植酸的全过程。提出了合理的工艺条件和适应于工业化生产的途径。     

从米糠中提取植酸的新工艺

用酸浸法从米糠中提取植酸钙 ,并进一步制成成品植酸溶液。结果表明 ,在盐酸浓度为 0 .4～ 0 .8mol/L ,酸用量为米糠的 10倍左右时工艺条件最佳     

省外技术市场之窗 江苏技术项目展示

高纯化植酸钠——柠檬酸发酵促进剂 经过高纯化植酸钠制备工艺条件的系统综合研究,建立了系统精确测定植酸的测试方法,14种样品中植酸含量最高者为米糠,采用2％Na_2SO_4的2.42％HCl溶液(pH3～3 5)振荡0.5h,再用2％Cacl_2、2NNaOH中和调和pH7 5沉淀植酸钠粗品,然后通过脱蛋白、阴阳离子层析和诱导结晶等纯化技术获植酸钠纯品,离子色谱等离子光谱测试说明其纯度比美国Sigma化学公司标物提高0.2％,红外光谱和核磁共振鉴定两者有相同的化学结构,并总结出一整套获得高纯化植酸     

阴离子交换树脂分离卡那霉素A、B组分的研究

根据吸附色层分离原理 ,利用阴离子交换树脂分离卡那霉素A、B组分 ,研究了不同树脂类型、不同树脂粒径及不同洗脱条件 (洗脱液NH4 OH浓度、洗脱流速、上柱量 )对分离效果的影响 .以含卡那霉素B 2 0 %的结晶母液为原料 ,通过试验确定了分离提取高纯度的卡那霉素B组分的最佳工艺条件为 :洗脱剂NH4 OH体积分数为 0 .6 % ,洗脱流速 0 .5mL/min ,树脂粒径为 0 .2 0mm ,上柱量为 1.0 5 μg/mL(树脂 ) .     

离子吸脱法从脱脂米糠中提取植酸的研究

本实验以脱脂米糠为原料,通过酸浸、离子交换吸附、洗脱、精制、浓缩过程制得植酸。试验结果表明,离子吸脱法从脱脂米糠中提取植酸的最佳工艺条件为：碱洗脱的流速为2Bv／h,碱液浓度为2mol/L,操作温度为45℃,pH为3．0。     

酶法常压水解辅助离子交换技术从脱脂米糠中提取肌醇

肌醇具有良好的生理与保健作用,近年来需求量不断增加,出口市场供不应求。从肌醇的生产技术看来,我国肌醇生产企业一直沿用传统的生产工艺,生产效率徘徊不前。为了改善肌醇传统生产工艺生产周期长、收率低的问题,在传统工艺基础上开展了微波辅助浸提提取菲汀,离子交换树脂吸附植酸,弱碱液洗脱成植酸盐,植酸盐酶法常压水解,水解液过滤后离子交换树脂除杂与脱色,再行浓缩、结晶与精制的实验研究。通过实验获得的产品与传统工艺对比,产品各项质量指标均达标,收率由原来的不足10%提高到13%以上。液相色谱图也和标样具有很好的相关性。说明改进后的生产工艺提升了肌醇的质量和收率,具有较好的应用价值。     

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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