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1.
研究了款冬花色素的热稳定性,氧化还原稳定性和pH值稳定性,并对常用的几种食品添加剂对款冬花色
素的稳定性进行了探讨,结果表明,款冬花色素易溶于丙酮,属于脂溶性色素;在pH=3~9时,款冬花色素的稳定
性较好;氧化还原剂及食品添加剂对其稳定性影响不大Fe3+金属离子对其影响显著Na+有增色作用60℃水浴温度
在以下色素的热稳定性较好 相似文献
2.
卵叶小蜡果红色素的性质及其稳定性 总被引:1,自引:0,他引:1
对卵叶小蜡果红色素的基本理化性质,以及光、温度、氧化还原介质、3种食品添加剂和6种金属离子对其稳定性的影响进行了分析探讨。结果表明,卵叶小蜡果红色素属水溶性花色苷类,该色素对光和热的耐受性较好,色素的耐氧化和还原性较好,金属离子中Zn^2 、Cu^2 和Fe^3 对其吸光值有一定不良影响,3种常用食品添加剂(如葡萄糖、VitC、苯甲酸钠)、Mg^2 、Al^3 、和Mn^2 对色素稳定性无影响或影响甚微。 相似文献
3.
对树莓色素的提取方法以及光、热、氧化剂H2O2、还原剂Na2SO3,食品添加剂,常见金属离子等对其稳定性的影响进行了研究。结果表明树莓色素有较好的光热稳定性,常见食品添加剂和常见金属离子对其稳定性无明显影响。 相似文献
4.
在本文中,在不同环境条件下对于沙枣花中提取的天然黄色花青素进行稳定性分析。结果表明,该花青素溶于热水,最大吸收波长为416nm,具有较好的耐热性、耐光性和耐氧化还原性,在酸性至中性条件下食品添加剂共存时该色素相当稳定,Na+、Ca2+、Mg2+、Zn2+等金属离子对这种色素具有护色作用,但是金属离子Fe3+、Al3+对色素有一定的影响。它是一种来源充足,使用方便的天然花青素也是良好的食品添加剂一着色剂。 相似文献
5.
陕西凤翔辣椒红色素的色度稳定性研究 总被引:1,自引:0,他引:1
李利华 《陕西理工学院学报(自然科学版)》2008,24(4)
对陕西凤翔辣椒红色素的色度稳定性进行了研究。结果表明:色素主色度在465rim有最大吸收峰;色素的色度耐光性较好;温度低于80℃时色素的色度具有良好的热稳定性;色素的色度耐酸、碱性较好;金属离子Na^+、K^+和Fe^3+对色素的色度无明显影响,Cu^2+、Fe^2+、Al^3+和Ca^2+能使色素的色度的最大吸收峰偏移;色素的色度耐氧化性较好,耐还原性较差;食品添加剂葡萄糖不影响色素的色度的稳定性,柠檬酸对色素的色度有一定的破坏作用。 相似文献
6.
空心泡红色素的性质及其稳定性研究 总被引:1,自引:0,他引:1
对空心泡红色素的基本理化性质,以及光、温度、pH值、氧化还原介质、常用食品添加剂和6种金属离子等对其稳定性的影响进行了分析探讨。结果表明,空心泡红色素属水溶性花青苷类色素, 适于作天然食用着色剂。该色素对光和热的耐受性较好;适用pH值范围宽;色素的耐氧化和还原性较差;金属离子中Mn^2 和高质量浓度的Zn^2 、Cu^2 和Fe^3 等对其吸光度有明显不良影响,而常用食品添加剂(如葡萄糖、NaCl、苯甲酸钠等)、Mg^2 、Al^3 及低质量浓度的Zn^2 、Cu^2 和Fe^3 对色素稳定性无影响或影响甚微。 相似文献
7.
对陕南地产黄色桔皮进行了色素的提取及稳定性研究。结果表明:桔皮黄色素水溶性好,其最大吸收波长为280nm,对光、热耐受性强。当pH为2~10时,色素稳定;桔皮色素对于Na^ ,Mg^2 ,Mn^2 ,Ca^2 ,Cu^2 金属离子的作用不显著,但对Fe^3 较敏感;色素有较好的耐还原能力,耐氧化能力较差,加入食品添加剂,无变色反应。 相似文献
8.
山城紫苕色素稳定性的初步研究 总被引:3,自引:0,他引:3
主要研究pH值、温度、光照、金属离子及其它食品添加剂和氧化剂对山城紫苕色素稳定性的影响.实验结果表明:紫苕色素在pH=3.0左右,降解缓慢;对光、热都较稳定;除Fe^3 、Sn^2 外,大多数离子影响较小;常用食品添加剂影响也很小;强氧化剂对其有破坏作用. 相似文献
9.
蛇莓果天然色素的稳定性分析 总被引:5,自引:0,他引:5
研究了常用食品添加剂维生素C,有机酸,糖类和常见和几种金属离子Na^+,K^+,Ca^2+,Mg^2+,Fe^2+,Zn^2+,Al^3+对蛇莓果中天然红色素稳定性的影响。并对色素的耐酸碱性,耐氧化性,耐还原性以及耐热性进行了探讨。 相似文献
10.
报道了山楂红色素的稳定性,受高温加热及强光照射时的变化,以及一些金属离子、有机酸、氧化剂、还原剂、糖类、食品添加剂对山楂红色素稳定性的影响。结果表明,山楂红色素在酸性条件下稳定,对于光有良好的稳定性,氧化剂、还原剂及抗坏血酸对色素有一定的降解作用;柠檬酸对色素有明显的增色作用;糖类、除Fe^3+、Sn^2+的金属离子及苯甲酸钠对色素的稳定性没有影响。 相似文献
11.
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. 相似文献
12.
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. 相似文献
13.
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well. 相似文献
14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation. 相似文献
15.
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。 相似文献
16.
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. 相似文献
17.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
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- 相似文献
18.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
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- 相似文献
19.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
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 相似文献
20.
《上海师范大学学报(自然科学版)》2014,(5):550
<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 相似文献