Synthesis of p toluidine o sulfonic acid from p toluidine by sulfonation in solvent was studied,and effects of various reaction conditions or factors on the reaction were discussed in detail.As a result,the follow...Synthesis of p toluidine o sulfonic acid from p toluidine by sulfonation in solvent was studied,and effects of various reaction conditions or factors on the reaction were discussed in detail.As a result,the following optimum process conditions are presented:50 mL dichlorobenzene,2%～5% oleum,molar ratio of sulfonating agent to p toluidine is 1.10～1.12,oleum is dropped in the reaction system in 10 min or so,sulfate formation time is 2 h,distillation lasts 8 h.Under the above conditions,the purity and the yield of p toluidine o sulfonic acid are better than that of the same product made in Japan.展开更多
A series of 3,3-arylidene bis(4-hydroxycoumarins) were synthesized by the reaction of aromatic aldehydes with 4-hydroxycoumarin using dodecylbenzenesulfonic acid as Br?nsted acid-surfactant catalyst in aqueous media a...A series of 3,3-arylidene bis(4-hydroxycoumarins) were synthesized by the reaction of aromatic aldehydes with 4-hydroxycoumarin using dodecylbenzenesulfonic acid as Br?nsted acid-surfactant catalyst in aqueous media and under microwave irradiation. The present method is operationally simple and the use of water as the reaction medium makes the process environmentally benign.展开更多
目的:探讨三硝基苯磺酸(TNBS)诱导结肠炎大肠道动力学异常的发病机制,研究参青方消炎愈溃,以及调节结肠神经递质P物质(SP)、血管活性肠肽(VIP)的作用机制.方法:用TNBS复制实验性大鼠结肠炎模型,随机分为参青方高剂量组、参青方低剂量组...目的:探讨三硝基苯磺酸(TNBS)诱导结肠炎大肠道动力学异常的发病机制,研究参青方消炎愈溃,以及调节结肠神经递质P物质(SP)、血管活性肠肽(VIP)的作用机制.方法:用TNBS复制实验性大鼠结肠炎模型,随机分为参青方高剂量组、参青方低剂量组、美沙拉嗪组、模型Ⅰ组、模型Ⅱ组及正常组,每组各10只.其中模型Ⅰ组于造模3d时处死,其余5组均在3d开始给药,每日1次,连续给药7d时处死.取大鼠结肠病变部位标本,检测结肠组织中超氧化物歧化酶(SOD)、髓过氧化物酶(MPO)及丙二醛(MDA)含量;免疫组化染色法检测SP和VIP的表达.结果:模型Ⅰ组结肠黏膜MPO、MDA含量比正常组增加(2.78±0.26 vs 0.56±0.20,15.14±2.02 vs 7.41±1.19,均P<0.05),SOD含量减少(84.15±6.27 vs 176.33±12.06,P<0.05);与模型Ⅱ组比较,参青方高剂量组、参青方低剂量组和美沙拉嗪组MPO、MDA含量明显减少(1.03±0.23,1.57±0.27,1.59±0.12 vs 2.03±0.33;8.30±1.27,10.09±1.09,10.46±1.37 vs 14.38±1.84,均P<0.05),SOD含量增加(190.17±7.71,178.90±8.59,176.13±9.50 vs 107.09±6.37,均P<0.05).正常组大鼠结肠组织可见VIP、SP阳性表达,与正常组比较,模型Ⅰ组大鼠结肠组织SP、VIP表达减少(42608.00±4823.37 vs 461570.00±18227.7;50801.90±7698.09 vs 607333.90±34166.35,均P<0.05),经治疗后,参青方高剂量组、参青方低剂量组和美沙拉嗪组SP、VIP表达上调(302253.10±11484.92,171014.7±21993.34,158355.10±13855.66 vs 77260.26±9375.49;419171.36±23267.98,279572.17±26645.82,282438.50±13236.13 vs 111838.85±9698.09,均P<0.05).结论:参青方能够上调结肠VIP和SP表达,因而具有调节肠道动力学的作用.展开更多
A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MPs), which was synthesized th...A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MPs), which was synthesized through thermal radical copolymerization of metharylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) in the presence of pazufloxacin template molecules, on the gold electrode surface. Furthermore, 1-dedecanethiol was used to insulate the modified electrode. Alternating current (ac) impedance experiments were carried out with a Model IM6e to obtain the capacitance responses. Under the optimum conditions, the sensor showed linear capacitance response to pazufloxacin in the range of 5 ng·mL?1 to 5 μg·mL?1 with a relative standard deviation (RSD) 5.3% (n=7) and a detection limit of 1.8 ng·mL?1. The recoveries for different concentration levels of pazufloxacin samples varied from 94.0% to 102.0%. Electrochemical experiments indicated the capacitive sensor exhibited good sensitivity and selectivity and showed excellent parameters of regeneration and stability.展开更多
In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the form...In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the formation probability, morphology, and diameter of the resulting PAni-TSA nanofibers were sensitive to the synthetic conditions, such as reaction temperature, the molar ratio of TSA to aniline, and the concentration of TSA in the polymerization media. The molecular structure was characterized by using the FT-IR, Raman spectra and X-ray diffraction, which shows that the main chain structure of PAni-TSA nanofibers was in agreement with that of granular PAni.展开更多
The title compound 4-(3,4-methylenedioxylphenyl)-6-methyl-5-ethoxycaronyl-3,4- dihydropyrimidin-2(H)-one (C15H16N2O5) has been synthesized and determined by single-crystal X-ray diffraction. The crystal is of triclini...The title compound 4-(3,4-methylenedioxylphenyl)-6-methyl-5-ethoxycaronyl-3,4- dihydropyrimidin-2(H)-one (C15H16N2O5) has been synthesized and determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P with a = 7.580(1), b = 7.920(2), c = 13.168(4) ? a = 96.44(2), b = 96.71(2), g = 109.81(2), V = 728.8(3) 3, Z = 2, Mr = 304.30, Dc = 1.387 g/cm3, F(000) = 320, m(MoKa) = 0.105 mm-1 (l = 0.71073 ?, R = 0.0446 and wR = 0.1205. In the molecule the pyrimidine ring adopts a boat conformation.展开更多
文摘Synthesis of p toluidine o sulfonic acid from p toluidine by sulfonation in solvent was studied,and effects of various reaction conditions or factors on the reaction were discussed in detail.As a result,the following optimum process conditions are presented:50 mL dichlorobenzene,2%～5% oleum,molar ratio of sulfonating agent to p toluidine is 1.10～1.12,oleum is dropped in the reaction system in 10 min or so,sulfate formation time is 2 h,distillation lasts 8 h.Under the above conditions,the purity and the yield of p toluidine o sulfonic acid are better than that of the same product made in Japan.
文摘A series of 3,3-arylidene bis(4-hydroxycoumarins) were synthesized by the reaction of aromatic aldehydes with 4-hydroxycoumarin using dodecylbenzenesulfonic acid as Br?nsted acid-surfactant catalyst in aqueous media and under microwave irradiation. The present method is operationally simple and the use of water as the reaction medium makes the process environmentally benign.
文摘目的:探讨三硝基苯磺酸(TNBS)诱导结肠炎大肠道动力学异常的发病机制,研究参青方消炎愈溃,以及调节结肠神经递质P物质(SP)、血管活性肠肽(VIP)的作用机制.方法:用TNBS复制实验性大鼠结肠炎模型,随机分为参青方高剂量组、参青方低剂量组、美沙拉嗪组、模型Ⅰ组、模型Ⅱ组及正常组,每组各10只.其中模型Ⅰ组于造模3d时处死,其余5组均在3d开始给药,每日1次,连续给药7d时处死.取大鼠结肠病变部位标本,检测结肠组织中超氧化物歧化酶(SOD)、髓过氧化物酶(MPO)及丙二醛(MDA)含量;免疫组化染色法检测SP和VIP的表达.结果:模型Ⅰ组结肠黏膜MPO、MDA含量比正常组增加(2.78±0.26 vs 0.56±0.20,15.14±2.02 vs 7.41±1.19,均P<0.05),SOD含量减少(84.15±6.27 vs 176.33±12.06,P<0.05);与模型Ⅱ组比较,参青方高剂量组、参青方低剂量组和美沙拉嗪组MPO、MDA含量明显减少(1.03±0.23,1.57±0.27,1.59±0.12 vs 2.03±0.33;8.30±1.27,10.09±1.09,10.46±1.37 vs 14.38±1.84,均P<0.05),SOD含量增加(190.17±7.71,178.90±8.59,176.13±9.50 vs 107.09±6.37,均P<0.05).正常组大鼠结肠组织可见VIP、SP阳性表达,与正常组比较,模型Ⅰ组大鼠结肠组织SP、VIP表达减少(42608.00±4823.37 vs 461570.00±18227.7;50801.90±7698.09 vs 607333.90±34166.35,均P<0.05),经治疗后,参青方高剂量组、参青方低剂量组和美沙拉嗪组SP、VIP表达上调(302253.10±11484.92,171014.7±21993.34,158355.10±13855.66 vs 77260.26±9375.49;419171.36±23267.98,279572.17±26645.82,282438.50±13236.13 vs 111838.85±9698.09,均P<0.05).结论:参青方能够上调结肠VIP和SP表达,因而具有调节肠道动力学的作用.
基金Supported by the National Natural Science Foundation of China (Grant No. 20675064)the Natural Science Foundation of Chongqing City (Grant No. CSTC-2004BB4149 and 2005BB4100)High Technology Project Foundation of Southwest University (Grant No. XSGX02).
文摘A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MPs), which was synthesized through thermal radical copolymerization of metharylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) in the presence of pazufloxacin template molecules, on the gold electrode surface. Furthermore, 1-dedecanethiol was used to insulate the modified electrode. Alternating current (ac) impedance experiments were carried out with a Model IM6e to obtain the capacitance responses. Under the optimum conditions, the sensor showed linear capacitance response to pazufloxacin in the range of 5 ng·mL?1 to 5 μg·mL?1 with a relative standard deviation (RSD) 5.3% (n=7) and a detection limit of 1.8 ng·mL?1. The recoveries for different concentration levels of pazufloxacin samples varied from 94.0% to 102.0%. Electrochemical experiments indicated the capacitive sensor exhibited good sensitivity and selectivity and showed excellent parameters of regeneration and stability.
文摘In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the formation probability, morphology, and diameter of the resulting PAni-TSA nanofibers were sensitive to the synthetic conditions, such as reaction temperature, the molar ratio of TSA to aniline, and the concentration of TSA in the polymerization media. The molecular structure was characterized by using the FT-IR, Raman spectra and X-ray diffraction, which shows that the main chain structure of PAni-TSA nanofibers was in agreement with that of granular PAni.
基金Supported by the National Natural Science Foundation of China (No. 20372057) Natural Science Foundation of Jiangsu Province (No. BK2001142) and the Natural Science Foundation of Jiangsu Education Department (No. 01KJB150008) and Jiangsu Provincial
文摘The title compound 4-(3,4-methylenedioxylphenyl)-6-methyl-5-ethoxycaronyl-3,4- dihydropyrimidin-2(H)-one (C15H16N2O5) has been synthesized and determined by single-crystal X-ray diffraction. The crystal is of triclinic, space group P with a = 7.580(1), b = 7.920(2), c = 13.168(4) ? a = 96.44(2), b = 96.71(2), g = 109.81(2), V = 728.8(3) 3, Z = 2, Mr = 304.30, Dc = 1.387 g/cm3, F(000) = 320, m(MoKa) = 0.105 mm-1 (l = 0.71073 ?, R = 0.0446 and wR = 0.1205. In the molecule the pyrimidine ring adopts a boat conformation.
