搜索结果: 1-15 共查到“Tween 80”相关记录16条 . 查询时间(0.349 秒)
研究聚氧乙烯脱水山梨醇单油酸酯(吐温80)对鱼腥草挥发油和鱼腥草注射液的影响。 方法 :重点针对醛基化合物和新生成的物质,从不同产地药材、不同贮存温度、不同贮存时间的角度,对鱼腥草挥发油、鱼腥草注射液、吐温80与鱼腥草挥发油的混合溶液进行1H-NMR的测定和谱图比较。 结果 :4个产地鱼腥草的挥发油均存在3个醛基的1H-NMR单峰,但在与吐温80混合后这些醛基峰基本消失,并在δ 8.30 处出现了...
EGCG在Tween 80胶束体系中的性质
胶束 儿茶素没食子酸酯 萃取 Tween 80
2010/3/9
通过离子萃取技术, 从黄山绿茶中提取高纯度儿茶素没食子酸酯(EGCG). 在Tween 80/EGCG/H2O体系中, 随着EGCG浓度增加, Tween 80临界胶束浓度和胶束动力学半径增大; 随着Tween 80浓度增加, EGCG和Tween 80扩散系数减小, 而EGCG的紫外-可见吸收光强度和荧光强度增加. 对EGCG在Tween 80胶束中的定位也进行了讨论.
Span-20和Tween-80对发酵液中Nisin泡沫分离的影响
泡沫分离 非离子表面活性剂 乳链菌肽
2009/11/13
含0.5 g/L Tween-80发酵液；Tween-80的加入破坏了气泡表面的网状结构，因而泡沫层持气量较高；连续通气时，2种表面活性剂都会引起泡沫层高度降低，但Tween-80会增加泡沫层的稳定性. 当Tween-80浓度达0.5 g/L时，Nisin的收率大幅度提高，原因是分离过程中Nisin失活率减少.
EFFECT OF TWEEN 80 AND MOISTURE REGIMES ON ENDOSULFAN DEGRADATION BY PSEUDOMONAS AERUGINOSA
Tween 80 Moisture regimes Endosulfan Degradation Pseudomonas aeruginosa
2010/3/26
The problem of endosulfan bioremediation is poor solubility and restriction of appropriate
biocatalyst. One promising approach in increasing the bioavailability of this organic compound is addition o...
Effects of Tween 80 Pretreatment on Dry Matter Disappearance of Rice Straw and Cellulolytic Bacterial Adhesion
Tween 80 SDS Cellulolytic Bacteria Attachment Rice Straw
2016/5/3
An in situ experiment was conducted to find out whether Tween 80 improves rice straw digestion through increased adhesion of major fibrolytic bacteria. Rice straw was sprayed with various levels of Tw...
采用纤维素酶促水解的方法，以稻草为底物，探讨了添加化学表面活性剂Tween 80和生物表面活性剂鼠李糖脂对酶解过程的糖产率、酶稳定性、纤维素转化率的作用以及对酶动力学特征和酶在纤维素上吸附的影响.结果表明，不同浓度的Tween 80和鼠李糖脂对稻草酶解有不同程度的促进，添加0.016% 和0.048% Tween 80使糖产率分别提高18.07%和11.98%，而添加0.01%和0.03% 鼠李糖...
通过静态吸附实验，研究了25℃条件下，表面活性剂冲洗液Tween?80 在中砂上的吸附，以及CaCl2、SDS和木质素磺酸盐（木质素磺酸钠和木质素磺酸铵）对其吸附量的影响.结果表明，向Tween?80 溶液中加入CaCl2和SDS都可以显著增加其吸附量.投加量越多，吸附量越大，当投加量达到一定程度后，吸附达到饱和，不会继续增大.SDS以预吸附的方式注入同样会导致Tween?80 吸附量升高....
Tween-80胶束对苝醌类光敏剂基态和激发态的保护作用
Tween-80胶束(Tween-80 micelle) 苝醌类光敏剂(Perylenequinonoid photosensitizers) 竹红菌素(Hypocrellins) 金丝桃蒽酮(Hypericin) 光敏作用(Photosensitization) 保护作用(Protective effect)
2008/3/5
用Tween-80非离子型胶束增溶竹红菌甲素、乙素(HA、HB)及金丝桃蒽酮(HYP)等苝醌类光敏剂,发现该胶束对HA的基态和激发态都有保护作用。相对于含水有机体系,HA在胶束中基态的pKa值升高,荧光量子产率增大,光敏反应产生的活性中间体1O2和·0H的产额增加,从而提高了其光敏活性,这在光敏损伤作用中具有重要的生物学意义。实验还发现,Tween-80胶束对HB及HYP的保护作用与HA类似,而且...
Tween 80解除乙醇对内切葡聚糖酶(Cx)的抑制作用
内切葡聚糖酶(Cx) 乙醇 Tween 80 紫外光谱 圆二色谱
2007/12/20
摘要 通过还原糖量的测定,可知Cx酶在乙醇存在下活力降低。当该体系中加入一定浓度的Tween 80时,Cx酶抗乙醇抑制的能力增强。由紫外光谱及圆二色谱可见,乙醇使Cx酶中α-螺旋含量增加,Tween 80使Cx酶中α-螺旋含量减少,结构变得松散。适量的Tween 80能使Cx酶在乙醇中保持一种具有较高活力的构象。
Effects of Tween 80 Pretreatment on Dry Matter Disappearance of Rice Straw and Cellulolytic Bacterial Adhesion
Tween 80 SDS Cellulolytic Bacteria Attachment Rice Straw
2016/4/26
An in situ experiment was conducted to find out whether Tween 80 improves rice straw digestion through increased adhesion of major fibrolytic bacteria. Rice straw was sprayed with various levels of Tw...
First- and Second-Derivative Spectrophotometry for Simultaneous Determination of Copper and Cobalt by 1-(2-Pyridylazo)-2-naphthol in Tween 80 Micellar Solutions
Copper Cobalt PAN Simultaneous Derivative spectrophotometry
2010/4/19
1-(2-Pyridylazo)-2-naphthol (PAN) has been used for the simultaneous determination of copper and cobalt at trace levels. PAN at pH 1.89 forms red and green complexes with copper and cobalt, respective...
Effects of Tween 80 and Fibrolytic Enzymes on Ruminal Fermentation and Digestibility of Feeds in Holstein Cows
Tween 80 Fibrolytic Enzyme Digestibility Dairy Cow
2016/4/19
The effects of the nonionic surfactant Tween 80 and a mixture of fibrolytic enzymes on total tract digestion, in situ disappearance (ISD) and ruminal fermentation characteristics of orchardgrass hay a...
Influences of Surfactant Tween 80 on the Gas Production, Cellulose Digestion and Enzyme Activities by Mixed Rumen Microorganisms
Tween 80 Rumen Microorganisms Gas Production Enzyme Activity Cellulose Digestion Feed Additives
2016/4/13
The surfactant Tween 80 was evaluated for its ability to influence cumulative gas production, cellulose digestion, and enzyme activities by mixed ruminal microorganisms grown on barley grain or Orchar...
Effects of Tween 80 on In Vitro Fermentation of Silages and Interactive Effects of Tween 80, Monensin and Exogenous Fibrolytic Enzymeson Growth Performance by Feedlot Cattle
Enzymes Feedlot Cattle Growth Performance Ionophore Surfactant
2016/4/13
The effects of monensin, Tween 80 and exogenous fibrolytic enzymes on ruminal fermentation and animal performance were studied in vitro and in vivo. In Expt 1, the effects of the surfactant Tween 80 (...
Effects of Surfactant Tween 80 on Forage Degradability and Microbial Growth on the In vitro Rumen Mixed and Pure Cultures
In vitro Rumen Degradability Microbial Growth Surfactant Tween 80
2016/4/13
Effect of a surfactant Tween 80 on the bacterial growth in the rumen was examined on the in vitro pure cultures of Streptococcus bovis, Selenomonas ruminantium, Butyrivibrio fibrisolvens, Prevotella r...