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《黑龙江科技信息》2016,(33)
大孔吸附树脂是20世纪60年代发展起来的新型有机高聚物吸附剂,已在环保、食品、医药等领域得到了广泛的应用[1-2]。大孔吸附树脂是以苯乙烯和丙酸酯为单体,加入乙烯苯为交联剂,甲苯、二甲苯为致孔剂,它们相互交联聚合形成了多孔骨架结构,具有良好的大孔网状结构和较大的比表面积,可以有选择地通过物理吸附水溶液中的有机物。大孔吸附树脂通过物理吸附从溶液中有选择地吸附有机物质,对有机物选择性好,不受无机盐类及强离子、低分子化合物存在的影响[3-4]。大孔吸附树脂具有内部具有三维空间立体孔结构、物理化学稳定性高、解吸条件温和、再生处理方便、比表面积大、选择性好、吸附速度快、宜于构成闭路循环、吸附容量大、节省费用等优点[5-6]。本文对大孔吸附树脂在微生物制药分离纯化应用上的最新进展进行综述。 相似文献
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大孔吸附树脂是由吸附和筛选原理组合而成的分离材料。有机化合物所吸附力的不同和分子量的大小,在大孔吸附树脂上经过一定的溶剂洗脱而分开。这使得有机化合物尤其是水溶性化合物的提纯得以简化。但大孔吸附树脂分离效果受以下等众多因素制约。 相似文献
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在静态吸附条件下,测定了5种大孔吸附树脂在3种PH缓冲液中对7ACA和CPC的吸附量,筛选出吸附差异较大的HP20,进一步测定其在动态吸附条件下对7ACA和CPC吸附的流失曲线、吸附等温线及最大吸附量,以探索7ACA和CPC混合物的吸附及解吸最佳条件。 相似文献
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目的:选择DM130大孔吸附树脂对锁阳提取液中的熊果酸进行富集纯化,优化影响树脂吸附熊果酸的多个因素,提高树脂的吸附量。方法:运用正交实验对影响熊果酸吸附的条件进行优化。结果:得到了最佳的吸附工艺参数,即:在浓度为1.6mg/mL,PH 5.5,吸附温度40℃,吸附流速3BV/h下,熊果酸吸附量达到了48.1mg/g。结论:提高了树脂的吸附量,树脂可重复使用,有很好的应用前景。 相似文献
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本文研究了大孔吸附树脂对冬虫夏草多糖吸附特性,包括树脂预处理、冬虫夏草渗滤液的浓度、上样液的p H、冬虫夏草多糖液的流速及温度对冬虫夏草多糖吸附过程的影响,从而确定适宜的吸附条件。结果为:浓度2.0mg/m L,p H=6的水相流速为1.0m L/min,在温度为15℃时,为最佳的上柱吸附条件。 相似文献
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目的研究AB-8型大孔树脂富集、纯化打箭菊总黄酮的工艺条件。方法以打箭菊总黄酮洗脱率和含量为考察指标,考察大孔树脂富集、纯化打箭菊总黄酮的吸附性能和洗脱参数。结果打箭菊样品液50 mL上大孔树脂柱(d10 mm×h50 mm,干重10g),用蒸馏水200 mL、30%乙醇180 mL依次洗脱,打箭菊总黄酮富集在30%乙醇洗脱液部分。打箭菊总黄酮精制度达510.2%以上,洗脱率达94.6%,30%乙醇洗脱液干燥后总固物中打箭菊总黄酮含量可达62.4%.结论采用此法可有效用于打箭菊总黄酮的分离富集,提高打箭菊提取物中的总黄酮含量。 相似文献
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Hierarchically porous monoliths based on copper (Cu), cobalt (Co) and manganese (Mn) oxides with three-dimensionally (3D) interconnected macropores and open nanopores were prepared using metal bromides as precursors via a sol–gel process accompanied by phase separation. The difficulty of gelation for low-valence metal cation was overcome by introducing a highly electronegative Br atom near to the metal atom to control the rates of hydrolysis and polycondensation. The 3D interconnected macropores were obtained using appropriate polymers to induce phase separation. The domain sizes of macropores and skeletons can be controlled by reaction parameters such as concentration and/or average molecular weight of polymers, and the amount of hydrochloric acid. The crystalline metal oxide monoliths with their 3D interconnected macroporous structure preserved were obtained after heat treatment in air. 相似文献
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银杏叶黄酮种类、含量变化及形成规律与调控 总被引：1，自引：0，他引：1
经作者研究归纳,报道了银杏叶黄酮的种类、银杏叶黄酮含量的变化及其影响因子、银杏叶子黄酮生物体内的合成途径及其生理生化机制、银杏叶黄酮的体外合成等,并对今后银杏叶黄酮的调控研究提出了4点建议。 相似文献
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Schmitt Y Hähl H Gilow C Mantz H Jacobs K Leidinger O Bellion M Santen L 《Biomicrofluidics》2010,4(3):32201
The control of biofilm formation is a challenging goal that has not been reached yet in many aspects. One unsolved question is the role of van der Waals forces and another is the importance of mutual interactions between the adsorbing and the adsorbed biomolecules ("critical crowding"). In this study, a combined experimental and theoretical approach is presented, which fundamentally probes both aspects. On three model proteins-lysozyme, α-amylase, and bovine serum albumin-the adsorption kinetics is studied experimentally. Composite substrates are used enabling a separation of the short- and the long-range forces. Although usually neglected, experimental evidence is given for the influence of van der Waals forces on the protein adsorption as revealed by in situ ellipsometry. The three proteins were chosen for their different conformational stabilities in order to investigate the influence of conformational changes on the adsorption kinetics. Monte Carlo simulations are used to develop a model for these experimental results by assuming an internal degree of freedom to represent conformational changes. The simulations also provide data on the distribution of adsorption sites. By in situ atomic force microscopy we can also test this distribution experimentally, which opens the possibility to, e.g., investigate the interactions between adsorbed proteins. 相似文献
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银杏叶提取物（Gink Biloba Extract,GBE）是银杏干燥叶通过中药提取方法制成的提取物。文章分析了历年来相关GBE的提取和分离纯化方法,如常规提取法的水提取法,有机溶剂萃取法,树脂吸附分离法;新型提取法的超临界CO2萃取法,超声波提取法,高速逆流色谱法等以及GBE应用于牙膏的相关研究进展情况。 相似文献
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醋酸/水分离研究进展 总被引：8，自引：0，他引：8
醋酸是一种重要的化工原料，其水溶液广泛存在于各类工业过程中,由于醋酸／水体系的相对挥发度不大，生产中用于分离醋酸／水的普通精馏和共沸精馏工艺能耗较高，因此研究者和工业界都在寻求更好的分离方法,目前醋酸／水的分离方法有精馏法、萃取法、醋化法、中和法、吸附法、膜分离法等，其中有些方法已经工业化，具有成熟的生产工艺；有些则处于研究阶段,本文对这些方法的研究现状及应用前景进行了介绍和评述，提出了萃取精馏法将是一很有前途的分离方法。 相似文献
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The advent and dissemination of next-generation sequencing (NGS) technologies such as Illumina''s sequencing platforms has brought forth vast reductions in the cost, time, and technical difficulties associated with DNA and RNA sequencing. Despite this trend, the workflow required to generate nucleic acid libraries for sequencing remains time-consuming and laborious. The following research proposes a method for simplifying and streamlining this process by replacing the manual washing steps of the common magnetic bead-based cleanup with a novel microfluidic method by integrating magnetic separation and electrokinetic purification (MSEP). Requiring no pumps, pipette mixing, vortexing, or centrifugation, MSEP relies on selective adsorption of target DNA onto the magnetic beads with subsequent transport of beads through a microchannel undergoing an antiparallel electroosmotic flow. The synergetic flow conditions were optimized using a simple electrohydrodynamic flow model. This work demonstrates that MSEP is as effective in eliminating adapter-dimers from the post-ligation library mix as the manual method while also greatly reducing the hands-on time and amount of pipetting required. Although MSEP has been applied specifically toward NGS library preparation at this time, it has the potential to be adapted and employed for any bead-based separation scheme, namely, solid phase extraction, sequence-specific hybridization, and immunoprecipitation on a microscale. 相似文献
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Homsy A van der Wal PD Doll W Schaller R Korsatko S Ratzer M Ellmerer M Pieber TR Nicol A de Rooij NF 《Biomicrofluidics》2012,6(1):12804-128049
Clinical point of care testing often needs plasma instead of whole blood. As centrifugation is labor intensive and not always accessible, filtration is a more appropriate separation technique. The complexity of whole blood is such that there is still no commercially available filtration system capable of separating small sample volumes (10-100 μl) at the point of care. The microfluidics research in blood filtration is very active but to date nobody has validated a low cost device that simultaneously filtrates small samples of whole blood and reproducibly recovers clinically relevant biomarkers, and all this in a limited amount of time with undiluted raw samples. In this paper, we show first that plasma filtration from undiluted whole blood is feasible and reproducible in a low-cost microfluidic device. This novel microfluidic blood filtration element (BFE) extracts 12 μl of plasma from 100 μl of whole blood in less than 10 min. Then, we demonstrate that our device is valid for clinical studies by measuring the adsorption of interleukins through our system. This adsorption is reproducible for interleukins IL6, IL8, and IL10 but not for TNFα. Hence, our BFE is valid for clinical diagnostics with simple calibration prior to performing any measurement. 相似文献
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本文浅述了现有的关于MOFs在单组份气体捕集储运、多组分气体吸附分离方面应用的研究成果与挑战,归纳了在MOFs改性问题上主要有增加材料孔道利用率和改进分子结构两条思路,并提出了改性工作所面临的孔道交叠、塌缩难题以及其所带来的在可控选择性吸附方面应用的可能与光促MOF反应的前景。最后概括介绍了计算机模拟实验在MOFs研究中的巨大作用。 相似文献
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BackgroundRosemary (Rosmarinus officinalis) contains active substances that have desirable properties for industrial and herbal medicine applications, e.g., essential oils (1.5–2.5%), tannins, flavonoids, triterpenes, saponins, resins, phytosterols, rosmarinic acid and many others. The aim of this study was to determine the influence of rosemary extract and 20% rapeseed oil substitution for animal fat on storage changes and inhibition of cholinesterases in liver pâté.ResultsPreliminary research showed that rosemary extract exhibited antioxidative activity in the system of accelerated Rancimat and Oxidograph tests. Then, rosemary extract was used as an ingredient in liver pâté. During the experiment, meat samples were refrigerated and tested on days 1, 5, 8, 12 and 15 after production. The study proved that the substitution of 20% of animal fat with rapeseed oil decreased the content of saturated acids and increased the content of monoenic fatty acids by approximately 5% and polyene fatty acids by 40%.ConclusionsIn addition to antioxidative activity, the rosemary extract affected the health-promoting value of the samples, which inhibited cholinesterase activity during the entire storage period. The extract inhibited AChE more than BChE.How to cite: Bilska A, Kobus-Cisowska J, Kmiecik D, et al. Cholinesterase inhibitory activity, antioxidative potential and microbial stability of innovative liver pâté fortified with rosemary extract (Rosmarinus officinalis). Electron J Biotechnol 2019;40. https://doi.org/10.1016/j.ejbt.2019.03.007 相似文献
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红壤对稀土元素的吸附与解吸特性研究 总被引：1，自引：0，他引：1
对不同母质来源的红壤样品和粘粒矿物进行了稀土元素吸附、解吸和吸附动力学实验,并进行了三种吸附模式和六种吸附动力学模式的数学拟合⒚结果表明,测试样品对稀土元素的吸附过程可用 Ｌａｎｇｍ ｕｉｒ 吸附方程和 Ｌａｎｇｍ ｕｉｒ 吸附动力学方程来描述⒚ 相似文献