食品用天然苋菜红色素最佳浸提条件初探

本文研究了天然苋菜红色素的最佳浸提条件，并探讨了在浸提过程中温度，时间，酸度等因素对苋菜红色素浸提率的影响，确定了天然苋菜红色素提取工艺最佳浸提条件，。     

天然食用色素——紫色素和蓝色素的提取技术

我国对食用色素控制较为严格。合成色素只准使用苋菜红、胭脂红、赤鲜红、新红、柠檬黄、日落黄、靛蓝和亮蓝。目前已开发、投产且获准使用的天然色素有甜菜红、辣椒红、紫胶红、红花黄、天然苋菜红、玉米黄、桅子黄、β—胡萝卜素、叶绿素铜钠盐、玫瑰茄红、核黄素、菊花黄、黑豆红、萝卜红、可可色素、焦糖、姜黄、高梁     

伊犁红星苹果色素的提取及稳定性研究

采用正交试验对伊犁红星苹果色素的最佳提取条件进行了研究,并探讨该色素的稳定性.结果表明:伊犁红苹果色素的最佳提取工艺为:料液比为1:30,乙醇浓度为90％,浸提时间3h,提取温40℃条件下色素产率最高;该色素耐高温性、耐光性好,在常用食品添加剂等条件下有较好的稳定性,可作为天然植物色素在食品、饮料等行业中使用.     

食用色素苋菜红荧光光谱测定与量子产率的研究

研究了pH、防腐剂、氧化还原剂等因素对苋菜红荧光光谱的影响,建立了荧光光谱法检测食用合成色素苋菜红的分析方法。以pH=6的三酸缓冲溶液为研究体系,测定波长为λ_(ex)=350 nm,λ_(em)=421 nm,对金属离子、食用酸、猝灭剂、糖类、防腐剂等对苋菜红荧光光谱的影响做了实验研究,测定了模拟样品的加标回收率,建立了测定苋菜红的荧光分析方法,相关系数r=0.9947,检出限为1.00×10~(-7)mol/L,回收率在92.25%～102.1%。以硫酸奎宁为参比标准,测量了苋菜红在不同激发波长下的荧光量子产率,结果表明:在λ_(ex)=320 nm,荧光量子产率较大为0.336。     

南瓜黄色素提取工艺与稳定性研究

通过试验，对南瓜黄色素提取的条件和稳定性进行了研究。结果表明，提取的最佳工艺条件是以pH值为12、体积分数95％的无水乙醇为浸提剂，按每克丝状南瓜加浸提剂10ml的比例投料，在温度70℃下，浸提时间为5h；同时，实验结果表明：南瓜黄色素是一种稳定性良好的食用天然色素。     

天然色素玉米黄的提取

采用浸提法从黄玉米中提取天然色素玉米黄。实验选择了浸提溶剂：无水乙醇与石油醚重量比为１：４的混合溶剂;找出了色素提取的最佳条件;溶剂与玉米粉的重量比例为２：１,浸提时间为１．５ｈ,浸提温度为５５℃,浸提次数为二次。初步设计了成品色素生产的工艺流程。     

落葵色素的提取、组分分离及性质研究

本文研究了红落葵果实色素的提取工艺；色素中各组分的分离；光、热、酸度、部分金属离子及氧化剂、还原剂对色素稳定性的影响．确定了以ＨＡｃ水溶液为浸提剂的浸提工艺。获得了四个色素的组分，并对每个组分进行了性质试验．研究结果为落葵色素的提取、组分分离精制及应用提供了科学依据．     

微波萃取苋菜天然红色素的初步研究

采用微波萃取技术,对苋菜天然红色素进行萃取研究,同时与水萃取法作比较研究。结果显示2种方法萃取苋菜天然红色素在可见光波段的吸收峰位置一样。经色素稳定性测定2种提取方法所得物质也表现出高度的一致性。微波萃取速率以及萃取率比水萃取法高,所以本文的研究具有较高的价值。     

南瓜色素的提取及其理化性质研究

试验研究了南瓜色素的乙醇提取工艺条件和理化性质.研究结果表明,最优工艺条件是以无水乙醇为浸提剂,温度为70℃,固液比为1:11,浸提时间3.5 h;结果表明,南瓜色素是一种稳定性良好的天然色素.     

高效液相色谱法同时测定食品中10种人工合成色素含量的研究

建立一种同时测定食品中10种人工合成色素(柠檬黄、新红、苋菜红、靛蓝、胭脂红、日落黄、诱惑红、亮蓝、酸性红、赤藓红)的高效液相色谱方法.采用ProElut PWA-2固相萃取小柱,对食品中的色素进行提取净化.该方法能在18 min内完成10种人工合成色素的分析检测,10种色素的线性范围为0.5 ～100 mg/L,检出...     

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

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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