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Application Prospect (application + prospect)
Selected AbstractsSynthesis of the hydrophobic,hydrophilic macroporous poly divinylbenzene/poly(sodium acrylate) IPN resin and adsorption performance for berberinePOLYMERS FOR ADVANCED TECHNOLOGIES, Issue 12 2009Guqing Xiao Abstract The macroporous polydivinylbenzene/poly(methyl acrylate) interpenetrating polymer network (PDVB/PMA IPN) was prepared by the sequential suspension polymerization method, and was modified to be hydrophobic,hydrophilic macroporous polydivinylbenzene/poly (sodium acrylate) IPN (PDVB/PNaA IPN) by converting the PMA to PNaA under the condition of base. The effects of different mass ratio of the two networks and different cross-linking degree of the second network on the pore structure and adsorption capacity of PDVB/PNaA IPN resin were studied. The PDVB/PNaA IPN resin whose adsorption quantity is the biggest was chosen to study further. The pore structure, the weak acid exchange capacity, the water retention capacity, and the swelling ability of PDVB/PNaA IPN resin were measured. The study focused on the adsorption isotherms of berberine at different temperatures. Isosteric adsorption enthalpy, adsorption Gibbs free energies can be calculated according to thermodynamic functions. The results show that the saturated adsorption quantity of berberine is up to 109.4,mg,ml,1 (wet resin) by the way of dynamic adsorption and desorption experiment. The resin could be reused by the mixture with 0.5% sodium chloride and 80% ethanol. On the one hand the hydrophobic PDVB in the PDVB/PNaA IPN resin has the ability of adsorption using ,,, interaction, and on the other hand the hydrophilic PNaA in the PDVB/PNaA IPN resin has the ability of adsorption using ion exchange interaction. An important conclusion can be drawn that the PDVB/PNaA IPN resin has a promising application prospect in extracting and separating quaternary ammonium type alkaloids such as berberine. Copyright © 2009 John Wiley & Sons, Ltd. [source] Synthesis of 3-methyl-N-substituted-1H-indoleASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 5 2009Xiao-Lin Zhang Abstract A practical synthesis of 3-methyl-N-substituted-1H-indole (N-substituted-skatole) starting from 2-halogen phenylamine was described, by following acetylation or sulfonylation, alkylation and the intramolecular Heck reaction. In this article, effects of the reactions temperature, solvent, time, proportion and the mount of catalyst were investigated. Target product has an application prospect. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd. [source] Effect of Neural Stem Cells on Apoptosis of PC12 Cells Induced by Serum DeprivationBIOTECHNOLOGY PROGRESS, Issue 4 2007Xiangqin Li Neural stem cells (NSCs) have a bright application prospect to be used to treat neurodegenerative diseases due to their capacity to give rise to the appropriate cell types when they are grafted. At present, however, the function of NSCs after transplantation is not quite ensured, whether to replace the degenerative cells or to secrete nutrient factors. On the other hand, pheochromocytoma cell line 12 (PC12) cells have been widely used for investigating Parkinsonapos;s disease (PD) since their apoptosis is similar to that of dopaminergic neuron cells. Therefore, the possible cytoprotective effects of NSCs on the apoptosis of PC12 cells induced by serum deprivation were investigated in this paper. PC12 cells were cocultured with NSCs in DMEM/F12 medium free of serum, and their morphologies, viabilities, and survival were observed with an inverted microscope and assessed with a CCK-8 assay. In addition, the concentrations of glial derived neurotrophic factor (GDNF) in different medium were detected with a GDNF Elisa kit, and the mechanism of NSCapos;s protective effect on PC12 cell apoptosis induced by serum deprivation was analyzed. The results showed that (1) PC12 cell apoptosis induced by serum deprivation increased with time, and only about 44.25% PC12 cells survived after 72 h; (2) NSCs culture medium protected against PC12 cell apoptosis insignificantly; (3) NSCs' supernatant and NSCs mildly prevented PC12 cells from apoptosis; (4) the amount of GDNF secreted by NSCs increased after the coculture with the apoptotic PC12 cells induced by serum deprivation. It can be concluded that there exists clear interaction between NSCs and apoptotic PC12 cells, and that GDNF secretion from NSCs is one of the important mechanisms to prevent the apoptosis of PC12 cells. [source] Effect of Cross Linking Agent on Alkali/Surfactant/PolymerCHINESE JOURNAL OF CHEMISTRY, Issue 1 2008Ke ZHANG Abstract Alkali/surfactant/polymer (ASP) multisystem flooding technique, which has an expansive application prospect, is one of the enhancing oil recovery (EOR) methods. By adding the organic chromium to the ASP, the molecular structure of polymer was made to change, and the capability of controlling mobility coefficient of ASP was improved. The results showed that multisystem could still keep ultra-low interfacial tension between the multisystem and crude oil after addition of Cr3+. The resistance factor and residual resistance factor, the indicator which describes the capability of controlling mobility, upgraded strikingly. However its storage modulus and loss modulus, the indicator which describes viscoelasticity, increased. The results of physical simulation experiment indicated that this type of improved ASP could increase the recovery ratio by 4.3% compared to common ASP multisystem. [source] | ||||||||||