首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   47篇
  免费   3篇
综合类   1篇
化学工业   10篇
金属工艺   1篇
机械仪表   2篇
轻工业   31篇
石油天然气   1篇
一般工业技术   3篇
自动化技术   1篇
  2023年   1篇
  2021年   1篇
  2019年   1篇
  2017年   3篇
  2016年   2篇
  2015年   4篇
  2014年   3篇
  2013年   4篇
  2012年   1篇
  2011年   3篇
  2010年   3篇
  2009年   1篇
  2008年   1篇
  2007年   7篇
  2006年   6篇
  2004年   1篇
  2002年   3篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1996年   1篇
  1991年   1篇
排序方式: 共有50条查询结果,搜索用时 15 毫秒
1.
建立乙醇-乙酸乙酯混合提取辣椒中辣椒素的工艺,采用高效液相色谱法测定其提取量,通过实验研究不同的影响因素对提取率的影响,并设计正交试验。确定了乙醇-乙酸乙酯(1:3)混合提取的最佳条件为,料液比1:20,辅助超声抽提时间50 min,提取温度60℃,实验优化后平均提取了达5.41 mg/g。该方法成本低,毒性低,重现性好,适合工业化生产。  相似文献   
2.
3.
An easy, rapid, sensitive, and cheap capillary electrophoresis (CE) method based a mixed surfactant system formed by sodium dodecyl sulphate (SDS) and polyoxyethylene sorbitan monolaurate (Tween 20) as modifier in the buffer was reported. Quantitative analysis of capsaicin and dihydrocapsaicin in Capsicum anuum, pepper sauce and porous capsicum plaster was demonstrated. After conducting a series of optimisations, baseline separation was obtained for the analytes within 5 min under the optimum conditions (15 mM sodium tetraborate–0.05% (v/v) Tween 20–2.2 mM SDS buffer (pH 10.1), 20 kV voltage, 214 nm UV detection). The method resulted in excellent linearity, with r2 of regression equation of 0.9994 and 0.9996 for capsaicin and dihydrocapsaicin, respectively. Recoveries were in the range 90–107% and 92–109% for capsaicin and dihydrocapsaicin, respectively.  相似文献   
4.
本文研究了辣椒素+明胶+阿拉伯树胶+NaCMC交联混合物涂覆在聚乙烯薄膜外层对小鼠趋避性的影响。辣椒素的涂覆浓度分别为0.5%,1.0%和3.0%。小鼠趋避效果的评价是采用聚乙烯薄膜袋内粮食的重量和聚乙烯涂层袋被咬伤的比例。结果表明,聚乙烯薄膜涂层袋对小鼠有显著的趋避性(P<0.05)。另外还可以看出,辣椒素鼠类驱避袋(涂覆浓度分别为1.0%和3.0%)能够有效地驱逐老鼠超过7天。辣椒素涂覆在聚乙烯薄膜外表面对鼠类驱避有显著作用。  相似文献   
5.
陈夫山  巩倩 《化工文摘》2007,(2):39-41,45
以过硫酸铵、亚硫酸氢钠作为引发剂,N,N’-亚甲基双丙烯酰胺作为交联剂,将木薯淀粉与丙烯酸、辣椒碱在水溶液中接枝共聚,合成了具有抗菌性的高吸水性树脂。文章主要考察了添加辣椒碱形式、反应温度、反应时间、引发剂用量、丙烯酸中和度、交联剂用量对合成产物吸水性能的影响。  相似文献   
6.
Capsaicinoids are a group of 12 or more related alkaloids responsible of the pungent sensation in fruits of the genus Capsicum. Capsaicin [(E)-N-(4-hydroxy-3-methoxybenzyl)-8-methyl-6-nonenamide] and dihydrocapsaicin are responsible for more than 90% of the pungency. This work describes the quantitative analyses by gas chromatography of the content of capsaicin and dihydrocapsaicin in the pericarp, placenta, and seeds of seven cultivars of chili peppers cultivated in the state of Yucatan, Mexico [chawa, dulce, sukurre, xcat’ik (Capsicum annuum L. var. annuum), maax (Capsicum annuum L. var. aviculare), and habanero orange and habanero white (Capsicum chinense Jacq.)]. Capsaicin content was higher, as expected, in the fruits of habanero orange and habanero white, followed by sukurre, chawa, xkat’ik, and maax. Dihydrocapsaicin content did not follow the same scheme, being higher in the fruits of sukurre, followed by chawa, habanero white, habanero orange, and maax. Xcat’ik showed minor quantities of dihydrocapsaicin, while dulce chili contained only traces of these two alkaloids.  相似文献   
7.
The present set of experiments was designed to explore avian insensitivity to capsaicin. Based upon a molecular model of avian chemosensory repellency, we hypothesized that structural modifications of the basic capsaicin molecule, which is itself not aversive to birds, might produce aversive analogues. To this end, European starlings (Sturnus vulgaris) and Norway rats (Rattus norvegicus) were given varied concentrations of synthetic capsaicin and four analogues (methyl capsaicin, veratryl amine, veratryl acetamide, vanillyl acetamide) in feeding and drinking tests. The results agreed with a model that we are developing to describe the chemical nature of avian repellents. Synthetic capsaicin and vanillyl acetamide were not repellent to birds, owing to the presence of an acidic phenolic OH group. Conversely, veratryl acetamide was aversive, due to the basic nature of this compound. For rats, repellent effectiveness among compounds was reversed: synthetic capsaicin was the best repellent while veratryl acetamide was the worst. We speculate that this taxonomic reversal may reflect basic differences in trigeminal chemoreception. In any case, it is clear that chemical correlates of mammalian repellents are opposite to those that predict avian repellency.  相似文献   
8.
辣椒精的精制及辣椒素的HPLC测定   总被引:16,自引:2,他引:14  
根据物理化学性质对辣椒油树脂进行精制,以得到结晶物;由高效液相色谱的分析结果推定该结晶物中含有较高纯度的辣椒素。  相似文献   
9.
The biogeography of pungency in three species of wild chili in the chaco and surrounding highland habitats of southeastern Bolivia is described. We report that Capsicum chacoense, C. baccatum, and C. eximium are polymorphic for production of capsaicin and its analogs, such that completely pungent and completely nonpungent individuals co-occur in some populations. In C. chacoense, the density of plants and the proportion of pungent plants increased with elevation. Above 900 m, all individuals in all populations except two were pungent; nonpungent individuals in at least one of the two polymorphic populations were likely a result of spreading by humans. The occurrence of pungent and nonpungent individuals in three species of ancestral Capsicum and the geographic variation of pungency within species suggest that production of capsaicin and its analogs entails both costs and benefits, which shift from one locality to another. Determining the selection pressures behind such shifts is necessary to understand the evolution of pungency in chilies.  相似文献   
10.
Background and objective: Capsaicin is the main pungent principle present in chili peppers has been found to possess P-glycoprotein (P-gp) inhibition activity in vitro, which may have the potential to modulate bioavailability of P-gp substrates. Therefore, purpose of this study was to evaluate the effect of capsaicin on intestinal absorption and bioavailability of fexofenadine, a P-gp substrate in rats.

Methods: The mechanistic evaluation was determined by non-everted sac and intestinal perfusion studies to explore the intestinal absorption of fexofenadine. These results were confirmed by an in vivo pharmacokinetic study of oral administered fexofenadine in rats.

Results: The intestinal transport and apparent permeability (Papp) of fexofenadine were increased significantly by 2.8 and 2.6 fold, respectively, in ileum of capsaicin treated rats when compared to control group. Similarly, absorption rate constant (Ka), fraction absorbed (Fab) and effective permeability (Peff) of fexofenadine were increased significantly by 2.8, 2.9 and 3.4 fold, respectively, in ileum of rats pretreated with capsaicin when compared to control group. In addition, maximum plasma concentration (Cmax) and area under the concentration-time curve (AUC) were increased significantly by 2.3 and 2.4 fold, respectively, in rats pretreated with capsaicin as compared to control group. Furthermore, obtained results in rats pretreated with capsaicin were comparable to verapamil (positive control) treated rats.

Conclusions: Capsaicin pretreatment significantly enhanced the intestinal absorption and bioavailability of fexofenadine in rats likely by inhibition of P-gp mediated cellular efflux, suggesting that the combined use of capsaicin with P-gp substrates may require close monitoring for potential drug interactions.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号