提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV ...提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV Ram an研究表明,高效NaY沸石导向剂中含有大量的六元环等低分子量硅铝酸根前驱体,它们有利于A型沸石成核与晶体生长.展开更多
AIM To screen optimal drugs against postmenopausal osteoporosis with cardiovascular protective activities. METHODS A series of benzodihydropyran derivatives were designed and synthesized in view of comprehensive obser...AIM To screen optimal drugs against postmenopausal osteoporosis with cardiovascular protective activities. METHODS A series of benzodihydropyran derivatives were designed and synthesized in view of comprehensive observations of raloxifene and ipriflavone. The antiosteoporosis activities of compounds a-e (10 -7 mol·L -1 ) on the proliferation of human osteoblast cell HOS TE85 were studied. The cardiovascular protective activities were evaluated by observing their effects on proliferation of human vascular endothelium cell ECV 304 and their protective effects on ECV 304 damaged by H 2O 2. RESULTS Their structures were determined by spectrums. Compounds a, b and c (10 -7 mol·L -1 ) were shown to significantly help proliferation of HOS TE85. In addition, b, d and e (10 -8 mol·L -1 ) helped proliferation of ECV 304 significantly. Compounds b and c (10 -6 mol·L -1 ) showed strong protective activity on ECV 304 damaged by H 2O 2. Compounds b and c shifted the KCl dose response curves to the right and decreased the maximal response. CONCLUSION Compounds b and c showed some bone and vascular protective activities which benefit postmenopausal osteoporosis and cardiovascular diseases.展开更多
This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of...This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of NaY zeolite.Conventionally,the synthesis temperature of NaY zeolite from water glass is about 100 ℃,and higher temperature(>100 ℃)leads to the formation of impurity.However,this work shows that high-temperature synthesis(100-140 ℃)still exhibits a pure phase NaY.It is very interesting that,compared with conventional temperature,high-temperature in the synthesis of NaY zeolite has obvious advantages such as short crystallization time and high n(Si)/n(Al)ratio in the product.More importantly,this method is possible to extend to the synthesis of NaA,NaX,Ω,ECR-1and MOR.展开更多
文摘提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV Ram an研究表明,高效NaY沸石导向剂中含有大量的六元环等低分子量硅铝酸根前驱体,它们有利于A型沸石成核与晶体生长.
文摘AIM To screen optimal drugs against postmenopausal osteoporosis with cardiovascular protective activities. METHODS A series of benzodihydropyran derivatives were designed and synthesized in view of comprehensive observations of raloxifene and ipriflavone. The antiosteoporosis activities of compounds a-e (10 -7 mol·L -1 ) on the proliferation of human osteoblast cell HOS TE85 were studied. The cardiovascular protective activities were evaluated by observing their effects on proliferation of human vascular endothelium cell ECV 304 and their protective effects on ECV 304 damaged by H 2O 2. RESULTS Their structures were determined by spectrums. Compounds a, b and c (10 -7 mol·L -1 ) were shown to significantly help proliferation of HOS TE85. In addition, b, d and e (10 -8 mol·L -1 ) helped proliferation of ECV 304 significantly. Compounds b and c (10 -6 mol·L -1 ) showed strong protective activity on ECV 304 damaged by H 2O 2. Compounds b and c shifted the KCl dose response curves to the right and decreased the maximal response. CONCLUSION Compounds b and c showed some bone and vascular protective activities which benefit postmenopausal osteoporosis and cardiovascular diseases.
文摘This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of NaY zeolite.Conventionally,the synthesis temperature of NaY zeolite from water glass is about 100 ℃,and higher temperature(>100 ℃)leads to the formation of impurity.However,this work shows that high-temperature synthesis(100-140 ℃)still exhibits a pure phase NaY.It is very interesting that,compared with conventional temperature,high-temperature in the synthesis of NaY zeolite has obvious advantages such as short crystallization time and high n(Si)/n(Al)ratio in the product.More importantly,this method is possible to extend to the synthesis of NaA,NaX,Ω,ECR-1and MOR.
