共查询到20条相似文献，搜索用时 78 毫秒
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采用酶法提取与热水抽提相结合的方法研究了总状蕨藻多糖的提取工艺,结果显示,采用固液质量比1∶10,蛋白酶用量136.5 U/g,于60℃下酶法提取2.5 h后,再将固液质量比调至1∶20,在温度95℃条件下继续进行热水提取2.5 h,多糖得率为6.7%,比单用热水提取法提高了131.0%。 相似文献
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采用单因素和正交优化实验19（43）确定酶法自溶罗非鱼下脚料的最适条件，结果表明，最适自溶条件为：料液质量比1：3，反应温度50％，pH7．5，反应时间6．5h；酶解结束蛋白质回收率为81．75％。 相似文献
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酶解法提取鱼油的工艺参数优化 总被引：1，自引：0，他引：1
利用蛋白酶酶解法从黄鳍金枪鱼（Thunnus albacares）加工的下脚料——鱼头中提取鱼油。以鱼油提取率和感官特征为指标，通过正交优化实验设计，获得了胰蛋白酶提取鱼油的最佳酶解工艺参数：酶解温度45℃，酶添加量1．5％．料液质量比1：1，酶解时间4h，酶解pH8。在该条件下．鱼油的提取率为4．34％，理化指标除过氧化值外均达到SC／T3502-2000的粗鱼油二级标准。多不饱和脂肪酸总含量高达38．47％,其中DHA和EPA的含量分别为23．63％和4．84％。 相似文献
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王永旺 《世界地质(英文版)》2014,(3)
为了粉煤灰的高附加值综合利用,采用酸浸法对准格尔地区循环流化床粉煤灰进行了镓的浸出实验研究,考察了多种因素对镓的浸出率的影响,包括粉煤灰粒度,酸的种类与浓度、酸浸温度与时间、固液比等。结果表明,提高镓的浸出率的适宜条件为：粉煤灰粒度200目,盐酸的浓度6 mol/L,酸浸温度应大于160℃,酸浸时间6 h,液固比在5∶1～6∶1之间为宜。在优选的工艺条件下,镓的浸出率可达80％以上。从粉煤灰中提取镓,使其作为一种资源加以利用,是提高粉煤灰综合利用价值的有效途径。 相似文献
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胰蛋白酶的固定化采用吸附－交联法。在单因素试验基础上，通过正交试验，获得了胰蛋白酶固定化的最佳条件：酶与载体体积比为2：1，吸附时间为10h,pH＝4．5，缓冲液浓度为0．05mol/L，戊二醛的质量分数为0．1％。此条件下制得的磁性酶活力回收在50％左右，相对酶活力达74％，该磁性酶对啤酒澄清防止冷浑浊有明显效果。 相似文献
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采用高压水热活化法对预先烧制的粉煤灰进行碱溶实验,探讨钙硅摩尔比、碱液浓度、液固比、苛性比、反应温度、反应时间等影响因素对于氧化铝溶出率的影响。考虑到氧化铝溶出率及反应成本等各方面因素,得出氧化铝溶出的适宜条件。结果表明：碱溶条件下,钙硅摩尔比为1.0,溶液碱浓度为350 g/L,液固比为10∶1,苛性比为14,反应温度280℃,活化时间为2 h。通过氧化铝溶出工艺条件的优化,可使氧化铝提取率达到95％以上。 相似文献
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采用单因子实验及均匀实验设计，考察了影响丙脒盐酸盐收率的因素，经回归分析，得出了合成丙脒盐酸盐的优化工艺条件：物料配比n（CH3CH2CN）：n（CH3OH）：n（HCl）=1：1．1：1．1；整个反应体系为无水体系；在反应前期，溶液温度为0-10℃，pH值为4．0左右，反应时间为9h；在反应后期，溶液温度为0-20℃，pH值为8．0-8．5；氨-甲醇溶液的质量分数为15．0％。在此优化工艺条件下，丙脒盐酸盐的收率为94．0％，含量≥99％。 相似文献
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对双酶法制备用作微胶囊壁材的低黏度辛烯基琥珀酸淀粉钠的工艺路线与工艺条件进行了研究。正交实验结果表明，在酯化淀粉乳质量浓度20％、每g淀粉α-淀粉酶的用量为6SKBU的条件下，影响产品性能的各因素中，糖化酶的用量对产品的DE值和流度的影响最大，各因素的重要性依次是：糖化酶的用量、糖化酶作用时间、α-淀粉酶保温作用时间。最佳工艺条件是：α-淀粉酶保温作用时间4min，每g淀粉糖化酶用量0．2GAU，糖化酶作用时间2．5h．此时产品的DE值为30，流度为80左右。 相似文献
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【目的】探讨鳙鱼(Aristichthys nobilis)鱼鳔黏多糖的提取工艺及提取物的化学组成及抗氧化活性。【方法】采用热水浸提法和碱液浸提法提取黏多糖,用GC-MS法测定分析所提取多糖的化学组成和抗氧化活性等性质。【结果】碱液浸提法的最佳工艺条件为料液质量体积比(g/m L)1∶20、碱液质量分数1%、提取温度70℃、提取时间为4 h,在此条件下,黏多糖的提取率为5.58%;热水浸提和碱液浸提得到的鳙鱼鱼鳔黏多糖量分别为5.3%和25.33%;气质联用色谱(GC-MC)测定结果显示,热水提取的黏多糖(WANVM)主要由质量分数13.72%木糖、19.57%甘露糖、16.11%葡萄糖及32.49%半乳糖构成;碱液提取的黏多糖(AANVM)主要由质量分数50%甘露糖和34.87%半乳糖构成。在相同质量分数条件下,WANVM清除羟基自由基、DPPH自由基及总还原力均高于AANVM。【结论】碱液浸提对黏多糖的提取效果优于热水浸提,AANVM、WANVM组分不同,且前者抗氧化活性略高于后者。 相似文献
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正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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The GRV 024516 and GRV 024517 meteorite samples collected from Grove Montains,Antactica are ureilite and H5 ordinary chondrite,respectively.Based on the study of mineralogy-petrology,the cosmic-ray exposure ages and gas retention ages of these two meteorites were determinated and calculated.Their cosmic-ray exposure ages are 33.3 Ma,51.7 Ma,and gas retention ages are 1936.8 Ma and 3720 Ma,respectively.The ureilite contains diamond,graphite and amorphous C,which are mainly carrier of noble gases indicating obviously shock metamorphism effects,which induced 40Ar partial loss.The H5 chondrite indicates thermal metamorphism of parent body,its gas retention age fall the range between 3220 Ma and 4510 Ma of the least shocked H5 chondrites 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献