Results 71 to 80 of about 731,385 (205)

谷氨酸结晶提取的研究

open access: yes, 1990
味精(-水合谷氨酸-钠),是人们生活的必需鲜味调料。近几年来,我国味精生产发展迅速,但生产水平与国外的先进工艺相比还有很大差距,主要是未能采取分离菌体后再进行浓缩处理的工艺。根据国内生产工艺的实际情况,本文探索了结晶过程中提高谷氨酸收率的各种途径,着重对谷氨酸的溶解度进行了与生产过程有关的一些应用基础研究。本论文考察了谷氨酸在纯溶液和等电点母液中的溶解度、温度、溶液pH值及电导率之间的关系以及镁盐、铝盐、钙盐、锌盐对谷氨酸溶解度的影响。最后,对真实发酵液及等电点母液做了模拟提取研究。实验结果表明:1 ...
李学
core  

Colloid‐Mediated Surface Reconstruction Through High‐Valence Element Integration Enables Stabilized Oxygen Redox and Fast Interfacial Kinetics in Li‐Rich Cathodes

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Lithium‐rich manganese‐based cathodes (LRM) deliver high discharge capacities beyond 250 mAh g−1, but their practical deployment is restricted by irreversible oxygen redox, structural reconstruction, sluggish kinetics and unstable cathode‐electrolyte interfaces (CEI). Here, we develop a colloid‐assisted anchoring‐diffusion engineering strategy
Jia‐Nan Hao   +13 more
wiley   +1 more source

一种天然脱落酸的提取方法

open access: yes, 2007
本发明属于生物工程领域。针对目前天然脱落酸 提取率和纯度不高的问题,本发明公开了一种天然脱落酸的提 取方法,通过发酵液酸化后过滤,大孔吸附树脂吸附后洗脱, 洗脱液经浓缩后进行萃取,萃取液浓缩得到结晶粗品;结晶粗品溶解后,用硅胶吸附杂质,加入己烷或苯或石油醚或四氯化碳结晶助剂,减压浓缩,冷却结晶,洗涤、真空干燥,制得95 %以上天然脱落酸结晶体,本方法具有提取率高 ...
周金燕, 谭红, 杨杰, 李志东
core  

植物油提取新工艺得到的五味子提取物对小鼠睡眠影响的实验研究

open access: yesZhongguo shiyan zhenduanxue, 2011
目的观察植物油提取新工艺得到的五味子提取物的改善睡眠作用。方法采用植物油提取新工艺得到五味子提取物,昆明种雄性小鼠随机分为对照组及五味子提取物低、中、高剂量组,对照组给予橄榄油20 ml/kg/d灌胃,五味子提取物低、中、高剂量组分别给予五味子提取物150、3006、00 mg/kg/d,连续灌胃15 d,通过直接睡眠实验、延长戊巴比妥钠睡眠时间实验、戊巴比妥钠阈下剂量催眠实验和巴比妥钠睡眠潜伏期实验,观察对小鼠直接睡眠、阈剂量戊巴比妥钠睡眠时间 ...
徐仲航, 金向群
doaj  

Regulating the Degradation and Cytocompatibility Behavior of Additively Manufactured Pure Zinc Through Post‐Processing Surface Treatments

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Zinc‐based biodegradable metals are promising implant materials, and additive manufacturing offers a powerful route for their patient‐specific fabrication. However, process‐induced surface defects can accelerate degradation and compromise biocompatibility, rendering post‐processing essential.
Yixuan Shi   +13 more
wiley   +1 more source

龙眼多糖、色素的超声强化提取及纯化

open access: yes, 2006
为解决龙眼(Dimocarpus Longan Lour)资源浪费,深加工技术水平低等问题,实现龙眼资源综合利用,进行了龙眼多糖、色素的超声强化提取及纯化研究。本文分析了超声提取和神经网络模型的机理,系统研究了影响超声提取龙眼多糖和色素各个因素;同时利用神经网络和单因素试验对提取条件进行了优化,并进行了小规模放大试验。粗多糖和色素经层析分离后,分别得到了纯度和色价较高的纯品。 本文首次系统对超声波功率、作用时间、液固比、温度等影响超声提取龙眼多糖和色素的因素进行了研究 ...
王统一
core  

紫茎泽兰提取物抑制食源性致病菌的研究

open access: yes四川大学学报. 自然科学版, 2009
用黄芪,苦参,狼毒提取物为阳性对照对紫茎泽兰提取物进行抑菌活性比较。并利用液液萃取、色谱法对紫荆泽兰醇提物进行分离精制。结果表明,紫茎泽兰醇提物具有明显抑菌效果,且效果优于狼毒提取物和黄芪提取物;对紫茎泽兰醇提物进行分离精制及抑菌试验,结果显示其乙酸乙酯萃取物柱层析组分SF4-2抑菌活性最强,能显著抑制沙门氏菌,蜡样芽孢杆菌,金黄色葡萄球菌和枯草芽孢杆菌生长,可用于食源性抗菌制剂的开发利用。
王婧   +6 more
doaj  

Lignin‐Derived Carbon Quantum Dots as Hole‐Trapping Promoters in LCDs/Bi‐MOF/ZIS With S‐Scheme Heterojunction for Efficient Photocatalytic Hydrogen Peroxide Production in Pure Water

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Photocatalytic hydrogen peroxide (H2O2) production from water and oxygen driven by solar energy represents a highly promising green and sustainable strategy. Herein, lignin‐derived carbon quantum dots (LCDs) were strategically introduced at the heterojunction between a Bi‐based metal organic framework (Bi‐MOF) and ZnIn2S4 (ZIS).
Wanpeng Sun   +8 more
wiley   +1 more source

用微波从植物中提取有效活性成份的方法

open access: yes, 2003
本发明涉及植物有效活性成份提取技术,具体地说是一种用微波从植物中提取有效活性成份的方法。步骤为:1)取植物,清洗去杂;2)切碎,宽为0.3~0.9cm的细丝;3)加水浸润,微波处理,按1∶1~40固液比,加水浸润,选择微波功率为200W~800W,时间为1min~60min;4)固液分离;步骤3)中微波处理时间为5~60min;在步骤3)后加设于30~80℃下,在容器中进行水回流提取1~5小时;步骤3)中微波处理时间为1~15min;在步骤3)后再加入乙醇溶剂,使其乙醇水溶剂中乙醇的浓度为10~90 ...
张卫, 金美芳, 周谨
core  

Selective Recovery of Palladium From Spent Automotive Exhaust Catalysts Using Amidoxime‐Functionalized Calix[4]arene and Subsequent Reduction to Palladium Nanoparticles

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Spent automotive exhaust catalysts represent the largest secondary resource of palladium (Pd), and their efficient recovery is essential to support the sustainability of Pd‐related industries. Inspired by supramolecular chemistry, a novel calixarene derivative, 5,11,17,23‐tetra‐tert‐butyl‐25,27‐bis[(N′‐hydroxyacetimidamide)ethoxy]‐26,28 ...
Tao Ge   +8 more
wiley   +1 more source

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