Oxalic acid is a weak and unsymmetrical bi-basic acid. There exist dissociation and association equilibria among the species in aqueous solution. The molar conductivity of the solution is the sum of the ionic contribu...Oxalic acid is a weak and unsymmetrical bi-basic acid. There exist dissociation and association equilibria among the species in aqueous solution. The molar conductivity of the solution is the sum of the ionic contributions.Based on this idea, a new prediction equation of ionic conductivity was proposed at low concentration. The molar conductivities of the solution and its relevant ions were calculated respectively. The results obtained were in good agreement with those from experiments and the Quint-Viallard equation.展开更多
High temperature liquid water(HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions,especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin ...High temperature liquid water(HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions,especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid(GA) and pyrogallol(PY) are under investigation in our laboratory. In this study,the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.展开更多
Objective:To evaluate the clinical efficacy of Xiaoaiping injection(XAPI)combined with cisplatin plus gemcitabine(regimen of GP)for patients with non-small cell lung cancer(NSCLC).Methods:A literature search was condu...Objective:To evaluate the clinical efficacy of Xiaoaiping injection(XAPI)combined with cisplatin plus gemcitabine(regimen of GP)for patients with non-small cell lung cancer(NSCLC).Methods:A literature search was conducted for collecting the randomized controlled trials(RCTs)on NSCLC treated by Xiaoaiping injection and GP in the Cochrane Library,PubMed,Embase,Chinese National Knowledge Infrastructure(CNKI),China Biology Medicine(CBM),China Science and Technology Journal Database(VIP)and the Wanfang Database from inception to December,2018.The quality of the RCTs was evaluated by the Cochrane risk of bias assessment tool,and data analysis were performed with Review Manager 5.3.Results:A total of 7 randomized controlled trials with 534 patients were incorporated.The results showed that there is no statistical significance in total effective rate[OR=1.39,95%CI(0.97,1.98),P=0.07]and gastrointestinal reactions rate[OR=0.44,95%CI(0.16,1.23),P=0.12]between GP alone and XAPI combined with GP.In comparison with GP alone,the XAPI combined with GP was associated with the lower effects on the decrease rate of hemoglobin[OR=0.49,95%CI(0.26,0.92),P=0.03],leukocyte[OR=0.40,95%CI(0.21,0.74),P=0.004]and platelet[OR=0.43,95%CI(0.22,0.87),P=0.02].However,performance status[OR=3.78,95%CI(2.24,6.38),P<0.0001]of patients in XAPI plus GP group is better than GP alone group.Conclusion:The combination of XAPI and GP has certain curative effect for patients with NSCLC compared with only receiving GP.However,more well-designedand multicenter RCTs should be performed to verify this result because of the quality of enrolled RCTs.展开更多
A novel method to prepare macroporous TiO2 ceramic, based on membrane emulsification was reported.To solve the paradox between the instability of nonaqueous emulsion and long emulsification time required by themembran...A novel method to prepare macroporous TiO2 ceramic, based on membrane emulsification was reported.To solve the paradox between the instability of nonaqueous emulsion and long emulsification time required by themembrane emulsification, a two-stage ceramic membrane jet-flow emulsification .was. proposed. Discussion wasconducted on the evolution of droplet size with time, which followed the Ostwalcl npemng theory. And a monodispersed nonaqueous emulsion with an average droplet size of 1.6μm could beprepared. Using the emulsion, as atemplate, TiO2 ceramics with an average pore size ot 1.1 μm were obtaineed. Tne material could be prospectivelyused for preparation of catalysts, adsorbents, and membranes.展开更多
The synthesis of methylene diphenyl dimethylcarbamate （4,4＇-MDC） from methyl N-phenyl carbonate （MPC） and formaldehyde （HCHO） was conducted in the presence of sulfonic acid-functionalized ionic liquids （ILs） ...The synthesis of methylene diphenyl dimethylcarbamate （4,4＇-MDC） from methyl N-phenyl carbonate （MPC） and formaldehyde （HCHO） was conducted in the presence of sulfonic acid-functionalized ionic liquids （ILs） as dual solvent-catalyst. The influences of the kind of anion in the ionic liquids, reaction conditions and the recycle of the ionic liquid on 4,4＇-MDC synthesis reaction were investigated. In addition, the acid strength of ILs was de-termined by the Hammett method with UV-visible spectroscopy, and the acid strength-catalytic activity relationship was correlated. The activity estimation results showed that [HSO3-bmim]CF3SO3 was the optimal dual solvent-catalyst. Under the suitable reaction conditions of 70℃, 40 min, molar ratio of nMPC/nHCHO= 10/1 and mass ratio of WILs/WMPC = 4.5/1, the yield of 4,4＇-MDC based on HCHO was 89.9 % and the selectivity of 4,4＇-MDC with respect to MPC was 74.9%. Besides, [HSO3-bmim]CF3SO3 was reused four times after being purified and no significant loss in the catalytic activity was observed.展开更多
文摘Oxalic acid is a weak and unsymmetrical bi-basic acid. There exist dissociation and association equilibria among the species in aqueous solution. The molar conductivity of the solution is the sum of the ionic contributions.Based on this idea, a new prediction equation of ionic conductivity was proposed at low concentration. The molar conductivities of the solution and its relevant ions were calculated respectively. The results obtained were in good agreement with those from experiments and the Quint-Viallard equation.
基金Project supported by the National Natural Science Foundation ofChina (No. 20674068)the Natural Science Foundation of Zheji-ang Province, China (No. Y405157)
文摘High temperature liquid water(HTLW) has drawn increasing attention as an environmentally benign medium for organic chemical reactions,especially acid-/base-catalyzed reactions. Non-catalyzed hydrolyses of gallotannin and tara tannin in HTLW for the simultaneous preparation of gallic acid(GA) and pyrogallol(PY) are under investigation in our laboratory. In this study,the hydrolysis kinetics of gallotannin and tara tannin were determined. The reaction is indicated to be a typical consecutive first-order one in which GA has formed as a main intermediate and PY as the final product. Selective decomposition of tannin in HTLW was proved to be possible by adjusting reaction temperature and time. The present results provide an important basic data and reference for the green preparation of GA and PY.
文摘Objective:To evaluate the clinical efficacy of Xiaoaiping injection(XAPI)combined with cisplatin plus gemcitabine(regimen of GP)for patients with non-small cell lung cancer(NSCLC).Methods:A literature search was conducted for collecting the randomized controlled trials(RCTs)on NSCLC treated by Xiaoaiping injection and GP in the Cochrane Library,PubMed,Embase,Chinese National Knowledge Infrastructure(CNKI),China Biology Medicine(CBM),China Science and Technology Journal Database(VIP)and the Wanfang Database from inception to December,2018.The quality of the RCTs was evaluated by the Cochrane risk of bias assessment tool,and data analysis were performed with Review Manager 5.3.Results:A total of 7 randomized controlled trials with 534 patients were incorporated.The results showed that there is no statistical significance in total effective rate[OR=1.39,95%CI(0.97,1.98),P=0.07]and gastrointestinal reactions rate[OR=0.44,95%CI(0.16,1.23),P=0.12]between GP alone and XAPI combined with GP.In comparison with GP alone,the XAPI combined with GP was associated with the lower effects on the decrease rate of hemoglobin[OR=0.49,95%CI(0.26,0.92),P=0.03],leukocyte[OR=0.40,95%CI(0.21,0.74),P=0.004]and platelet[OR=0.43,95%CI(0.22,0.87),P=0.02].However,performance status[OR=3.78,95%CI(2.24,6.38),P<0.0001]of patients in XAPI plus GP group is better than GP alone group.Conclusion:The combination of XAPI and GP has certain curative effect for patients with NSCLC compared with only receiving GP.However,more well-designedand multicenter RCTs should be performed to verify this result because of the quality of enrolled RCTs.
基金Supported by the National High Technology Research and Development Program of China （863 program, No.2006AA03Z534）, the Postdoctoral Science Foundation of China （No.20060400927）, the National Basic Research Program of China （No.2003CB6157070）, the National Natural Science Foundation of China （No.20436030）, Natural Science Foundation of Jiangsu Province （No.BK2006566）, and Jiangsu Planned Projects for Postdoctoral Research Funds （No.0601023B）.
文摘A novel method to prepare macroporous TiO2 ceramic, based on membrane emulsification was reported.To solve the paradox between the instability of nonaqueous emulsion and long emulsification time required by themembrane emulsification, a two-stage ceramic membrane jet-flow emulsification .was. proposed. Discussion wasconducted on the evolution of droplet size with time, which followed the Ostwalcl npemng theory. And a monodispersed nonaqueous emulsion with an average droplet size of 1.6μm could beprepared. Using the emulsion, as atemplate, TiO2 ceramics with an average pore size ot 1.1 μm were obtaineed. Tne material could be prospectivelyused for preparation of catalysts, adsorbents, and membranes.
基金Supported by the National Natural Science Foundation of China （20576025）. the National Key Basic Project of China （2005CCA06100）, the Science and Technological Research and Development Project of Hebei Province （07215602D） and the Natural Science Foundation of Hebei Province 032007000010）.
文摘The synthesis of methylene diphenyl dimethylcarbamate （4,4＇-MDC） from methyl N-phenyl carbonate （MPC） and formaldehyde （HCHO） was conducted in the presence of sulfonic acid-functionalized ionic liquids （ILs） as dual solvent-catalyst. The influences of the kind of anion in the ionic liquids, reaction conditions and the recycle of the ionic liquid on 4,4＇-MDC synthesis reaction were investigated. In addition, the acid strength of ILs was de-termined by the Hammett method with UV-visible spectroscopy, and the acid strength-catalytic activity relationship was correlated. The activity estimation results showed that [HSO3-bmim]CF3SO3 was the optimal dual solvent-catalyst. Under the suitable reaction conditions of 70℃, 40 min, molar ratio of nMPC/nHCHO= 10/1 and mass ratio of WILs/WMPC = 4.5/1, the yield of 4,4＇-MDC based on HCHO was 89.9 % and the selectivity of 4,4＇-MDC with respect to MPC was 74.9%. Besides, [HSO3-bmim]CF3SO3 was reused four times after being purified and no significant loss in the catalytic activity was observed.
