共查询到20条相似文献，搜索用时 578 毫秒
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采用溶剂提取法从番茄中提取番茄红素,根据单因素实验和正交试验,得到优化的提取条件：提取溶剂为乙酸乙酯,料液比 1：4,提取温度 50℃,提取时间 50mins,提取 3 次,提取液中番茄红素含量为 3.46mg/100gFW．同时进行了番茄红素的抗氧化性初步研究,结果表明番茄红素能有效延缓油脂氧化酸败,延长食用油保存期． 相似文献
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研究表明,番茄红素有多种提取方法,其中多采用有机溶剂提取法。本实验以不同番茄品种中新鲜的番茄皮为原料,选用乙酸乙酯为提取溶剂且料液比为1：10（g/mL）,提取温度为50℃,提取时间为2h,在番茄红素可能的最大吸收波长下（472nm,485nm,502nm）测定其吸光度值,计算番茄红素含量并进行比较。通过此方法分析普通番茄和樱桃番茄不同品种的番茄红素含量,以期为广大消费者食用和番茄红素的工业生产品种的选择提供一定的理论依据。 相似文献
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信阳毛尖茶叶茶多糖提取工艺的研究 总被引：2，自引：0，他引：2
以优等信阳毛尖茶叶为研究对象。以水为溶剂，选取固液比、浸提温度、浸提时间和浸提次数等四个因素做三个水平正交实验，确定茶多糖（TPS）提取工艺的最佳条件为固液比为1：10，浸提温度为80C，浸提时间为2h，浸提次数为2次。 相似文献
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探讨富川脐橙皮粉末皂化后番茄红素提取最佳工艺及分离纯化。以富川脐橙皮粉末为原料,0．Sm01／L碳酸钠溶液为皂化剂,在超声波协同下以氯仿和石油醚为混合溶剂提取番茄红素。设计了3因素3水平正交实验研究了番茄红素的提取工艺,以番茄红素的得率为考察指标筛选番茄红素的最佳提取工艺：料液（g／ml）比1：20、超声提取时间25min、氯仿：石油醚（1：3,V／V）,在此最佳提取条件下,番茄红素得率为14．72mg／100g。然后对脐橙皮中番茄红素进行分离提纯,得到脐橙皮中番茄红素的含量为62．83％。 相似文献
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马祥麟 《兰州石化职业技术学院学报》2012,12(2):7-8
番茄红素是一种具有防癌、抗癌活性的类胡萝卜素。针对兰州本地番茄,研究了不同的浸取液、提取时间、提取温度、提取次数、料液比等因素下的番茄红素提取效果,确定了较佳的提取工艺条件。 相似文献
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金银花中绿原酸提取及其在果蔬保鲜中的应用 总被引：1，自引：0，他引：1
以金银花的花、茎、叶为原料,乙醇为提取溶剂,通过单因子试验和正交试验,研究金银花绿原酸的最佳提取工艺;并用所得绿原酸对时令果蔬进行保鲜处理,以研究其对果蔬的保鲜效果．结果表明,从金银花的花和叶中提取其绿原酸的最佳浸提条件：浸提温度60℃,提取时间60min,料液比1：25,乙醇浓度60％．茎中绿原酸的提取最佳浸提条件：浸提温度60℃,提取时间45min,液料比1：25,乙醇浓度60％．保鲜实验结果表明：绿原酸对贡梨、红富士鲜切片都有保鲜效果．对圣女果的保鲜作用差． 相似文献
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以南瓜色素为提取产品,研究其提取工艺及产品的稳定条件.结果表明,南瓜色素提取的最佳条件：以无水乙醇为浸提溶剂,料液比为1∶9,浸提温度为60℃,浸提时间为3.0h;每100 g南瓜干品可提取南瓜色素为1.6547 g.研究表明南瓜色素在中性、偏碱性以及较高温度条件下都比较稳定,但对光照比较敏感. 相似文献
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利用野生山稔研制40℃，浸提时间为6h，溶液的pH值为2，原料量配比1：5（用水为溶剂）。饲料含量为（以100kg计）；白砂7kg，蜂蜜；2kg，柠檬酸：约0．3kg。苯甲酸钠：15g。提取兴：30kg。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献
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宋少华 《读与写:教育教学刊》2008,5(5):3-5
This essay mainly studies the linguistic features of News English on stylistics.The study is made mainly on three aspects of News English.They are lexical features.sentence features and grammar features of News English.Through the study we find that News English,as a distinctive and new language.has its own lin-guistic features in words, sentences and grammar. 相似文献
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正Nong Luhuan had a wild dream when he was little.He wanted to become a cartoonist and publish books of his own.Now,the 22-year-old art design major at Sichuan Fine Art Institute has achieved his dream.His micro blog cartoon has more than 260,000 followers and he will publish his first book this week.农璐焕小时候有一个疯狂的梦想,他想成 相似文献
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正The hardest arithmetic to master is that which enables us to count our blessings.世界上最难的算术题是如何清点我们的祝福。According to legend,a young man while roaming the desert came across a spring of delicious crystal-clear water.The water was so sweet,he filled his leather canteen so he could bring some back to a tribal elder who had been his 相似文献