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 2 0 %,压力为 1 5MPa的条件下水解 7～ 8h ,过滤并通过 70 1、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 2 2 5～ 2 2 6℃ ,肌醇收率以米糠计为 1 34 %。     

植酸生产可行性研究与我省发展状况的分析

目前我国植酸生产方法为沉淀法和离子交换法两种,前者工艺成熟,后者技术含量高.我们在分析改进的基础上,对两种生产工艺进行了对比性研究,从原料脱脂米糠中提取植酸,产率可达60%以上.并结合我省目前植酸生产与发展状况,进行了分析与展望.     

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%.     

以米糠提取植酸新工艺

植酸即环己六醇六磷酸酯，分子式为C6H18O24P6。植酸加热时发生分解，易溶于水，水溶液显酸性，植酸可溶于乙醇、丙酮，基本上不溶于无水乙醚、氯仿、苯等有机溶剂。植酸具有很强的螯合能力，能与许多金属离子形成螯合物。植酸几乎不以单独的游离形式存在，而以钙、镁及其复盐广泛存在于植物中，尤其存在于种子、谷物、胚芽、米糠等中，其含量如附表。随着农副产品的开发，对植酸的研究也比较活跃，植酸的制备方法更是各见特色。合成植酸的制取主要有两种方法；以环已六醇与磷酸为原料的化学合成法和以米糠等农副产物为原料的萃取法。米糠…     

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.     

米糠深加工技术的研究进展

文章系统地介绍了国内外米糠保鲜技术的研究发展,米糠油、米糠蛋白、米糠多糖和米糠植酸钙等主要功能物质的开发和在食品、医疗和化工领域的利用,并展望了其应用前景。     

美容保健化妆品米糠多糖类配制

米糠内服、外用已有之,内服可治急性食道狭窄症和脚气,做成糠袋外用,利于皮肤和头发的美容。本文介绍用米糠多糖类配制化妆品。这种化妆品能使皮肤柔嫩、滋润、使头发光亮,且能使皮肤创伤愈合。米糠多糖类可从米糠中离析制得。离析按下述方法进行:先将未经脱脂或用普通脂溶性有机溶剂脱脂的米糠,用水或含水溶性有机溶剂的溶液提取。用     

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     

植酸制取的研究

本文研究了以米糠饼为原料，稀盐酸为提取液，用石灰乳和氢氧化销中和沉淀制取植酸盐，并分别以稀盐酸溶解经过离子交换柱和草酸溶解、沉淀两种方法制取植酸。该法操作简便，原料易得，是一种可行的制取植酸的方法。     

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     

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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