共查询到20条相似文献，搜索用时 62 毫秒
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两种不同方法提取枸杞多糖的比较研究 总被引：1，自引：0，他引：1
以枸杞多糖为研究对象,比较两种不同提取方法对枸杞多糖的提取效果.采用单因素和正交试验对枸杞多糖提取工艺（热水法和微波法）进行了初步探讨,比较了料液比、浸提温度、提取时间、提取次数等因素对多糖提取率的影响.结果表明：传统热水法提取的最佳条件为提取温度90℃,提取时间3.5 h,料液比1∶10（mL/g）,提取次数3次;微波提取的最佳条件为微波功率480 W,微波时间20 min,料液比1∶30（mL/g）,提取次数2次.通过两种方法的比较,微波法提取多糖提取率提高近40%,微波法提取枸杞多糖优于热水浸提法. 相似文献
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采用热水浸提法提取枸杞提取液,将枸杞提取液与氨基酸、维生素等原料复配,制成复合营养素运动饮料。采用L9（34）正交试验的方法对枸杞的提取温度、提取时间及料液比的正交试验来确定枸杞提取液的最佳提取条件,对加入的枸杞提取液、蔗糖、柠檬酸和氯化钠用量的正交试验来确定复合营养素运动饮料的最佳配比。实验表明,最佳的枸杞提取液提取工艺为料液比1：10,温度80℃,时间75min,最佳的复合营养素运动饮料配方为枸杞提取液250mL/L、糖量80g/L、柠檬酸量1g/L、氯化钠0.5g/L,天冬氨酸0.593g/L、甘氨酸0.841g/L、缬氨酸0.255g/L、赖氨酸0.400g/L、异亮氨酸0.225g/L。维生素B60.010g/L、维生素B120.0002g/L、维生素C1.5g/L。 相似文献
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《武汉职业技术学院学报》2015,(5):97-100
采用盐酸-乙醇混合液为溶剂,研究了紫薯中花青素的提取工艺。经单因素实验和L9(34)正交实验(提取剂的酸醇比、料液比、提取温度、提取时间),得到最佳提取工艺参数为:浓度为1.0mol/L的HCl和体积分数95%的乙醇的混合液为溶剂,酸醇比为7∶3,提取料液比为1∶15,提取温度为60℃,提取时间为60 min。依此工艺,紫薯花青素的提取最佳得率为51.38mg/100g鲜重。 相似文献
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采用微波辅助提取技术,以臭牡丹黄酮类化合物的提取率为考察目标,利用溴化1-丁基-3-甲基咪唑溴([bmim]Br)离子液体水溶液为提取剂,提取臭牡丹中黄酮类化合物.分别考察了离子液体浓度、料液比、微波功率、p H值、提取温度和时间对臭牡丹黄酮类化合物提取率的影响.结果显示,臭牡丹黄酮类化合物的最佳提取工艺条件为:离子液体浓度为1.0 mol/L,料液比为1∶30,微波功率为500 W,p H值为8.0,提取温度为70℃,提取时间为6.0 min,在此条件下提取率可达4.318%.与传统乙醇提取法相比,该方法具有快速高效、溶剂使用量少、绿色环保、提取率高等优点. 相似文献
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MS和MS(1/ 2大量、微量元素全量 )培养基均适于枸杞的培养、芽增殖和发根 .在培养基的附加成分中激素的调节是重要的 ,激素以IBA浓度在 0～ 1.1× 10 - 6 mol/L均适其培养 ,但以IBA的浓度为 5 .5× 10 - 7mol/L效果最佳 ,在有机成份中VB1的含量对发根有明显的促进作用 .微量全量对枸杞的发根是必需的 .MS(1/ 2大量、微量元素全量 ) +VB12 .96× 10 - 5mol/L +IBA5 .5× 10 - 7mol/L(其他有机成分常量 )是枸杞芽增殖与发根同步的最佳培养基 . 相似文献
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采用超声波辅助碱醇法提取青麦仁中的阿魏酸，在单因素试验基础上通过响应面Box-Benhnken原理优化青麦仁阿魏酸的提取工艺。结果表明，最佳工艺参数为提取时间20 min、碱醇比(V/V)2∶1、NaOH浓度1.1 mol/L、超声温度55℃,此条件下阿魏酸的提取量达2.314±0.130 mg/g。 相似文献
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采用红外辅助提取法从乌饭树叶中提取槲皮素.以槲皮素提取率为指标,采用L9(34)正交试验法优化提取条件,得最佳提取工艺为:粉碎程度50目、乙醇溶液浓度70%、固液比1∶30(g·mL-1)、提取时间10 min,槲皮素提取率平均可达5.67%,高于超声波辅助提取的提取率. 相似文献
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离子色谱法测定桑叶中γ-氨基丁酸 总被引：2，自引：0，他引：2
研究了正交试验确定γ-氨基丁酸的最佳提取条件,离子色谱法检测桑叶中γ-氨基丁酸含量的分析方法.采用WIC-Ⅱ型离子色谱仪,以2.4 mmol/L Na2>CO3-2.4mmol/L NaHCO3溶液淋洗,流速为0.8 Ml/min,电导检测器对桑叶中γ-氨基丁酸的含量做了初步的测定.结果表明:最佳提取条件为:桑叶用量2 g,加液量80 Ml,超声提取时间35 min,超声提取温度50℃,桑叶中γ-氨基丁酸的含量为1.987 9 mg/g,该成份在检测条件下有较好的选择性,线性范围0.1～10 mg/L,相对标准偏差<1.08%,回收率为89.2%～98.7%. 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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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 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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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 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