Free radicals of superoxide anion and hydroxyl,which are harmful to human health,can be removed by some natural pigment.The scavenging action of yellow pigment of rosa chinensis to the above two free radicals were stu...Free radicals of superoxide anion and hydroxyl,which are harmful to human health,can be removed by some natural pigment.The scavenging action of yellow pigment of rosa chinensis to the above two free radicals were studied in this paper.Test results showed that the free radical scavenging rate was increased with the concentration of yellow pigment,and decreased with the action time.展开更多
[目的]研究月季花黄色素的提取工艺。[方法]利用超声波作用提取月季花黄色素,考察影响黄色素提取率的因素。[结果]结果表明,超声波作用下提取月季花黄色素的最佳工艺条件为:80%乙醇、pH值2.0、料液比1∶20、时间30 m in、提取级数3级。...[目的]研究月季花黄色素的提取工艺。[方法]利用超声波作用提取月季花黄色素,考察影响黄色素提取率的因素。[结果]结果表明,超声波作用下提取月季花黄色素的最佳工艺条件为:80%乙醇、pH值2.0、料液比1∶20、时间30 m in、提取级数3级。该条件下提取率为30.4%,色价为7.31。[结论]该研究结果为月季花的高效利用提供依据。展开更多
4-Methylbenzaldehyde and 2-methylbenzaldehyde are oxidated by iodine in the mixture of THF and ammonia water at room temperature to give p-tolunitrile and o-tolunitrile in 87.1% and 82.0% yield respectively.p-Tolunitr...4-Methylbenzaldehyde and 2-methylbenzaldehyde are oxidated by iodine in the mixture of THF and ammonia water at room temperature to give p-tolunitrile and o-tolunitrile in 87.1% and 82.0% yield respectively.p-Tolunitrile is nitrated with fuming nitric acid in concentrated sulfuric acid below 0℃ to produce 4-methyl-3-nitrobenzonitrile in 88.4% yield,and for o-tolunitrile to afford 2-methyl-5-nitrobenzonitrile in 79.6% yield.Their structures are characterized by IR and 1H NMR spectra respectively.展开更多
UO2(EPC)2(EPC=5-ethyl-3-pyridinecarboxylate)was synthesized by the hydrothermal reaction of UO2(NO3)2 ·6H2O with imazethapyr [2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-5-ethyl-3-pyridine-c...UO2(EPC)2(EPC=5-ethyl-3-pyridinecarboxylate)was synthesized by the hydrothermal reaction of UO2(NO3)2 ·6H2O with imazethapyr [2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-5-ethyl-3-pyridine-carboxylic acid] at 120 ℃,which 2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl group was removed under this condition to result in the formation of 5-ethyl-3-pyridinecarboxylate ligand(EPC).The structure and fluorescent property of the synthesized complex is also reported.CCDC:645641.展开更多
文摘Free radicals of superoxide anion and hydroxyl,which are harmful to human health,can be removed by some natural pigment.The scavenging action of yellow pigment of rosa chinensis to the above two free radicals were studied in this paper.Test results showed that the free radical scavenging rate was increased with the concentration of yellow pigment,and decreased with the action time.
文摘[目的]研究月季花黄色素的提取工艺。[方法]利用超声波作用提取月季花黄色素,考察影响黄色素提取率的因素。[结果]结果表明,超声波作用下提取月季花黄色素的最佳工艺条件为:80%乙醇、pH值2.0、料液比1∶20、时间30 m in、提取级数3级。该条件下提取率为30.4%,色价为7.31。[结论]该研究结果为月季花的高效利用提供依据。
文摘4-Methylbenzaldehyde and 2-methylbenzaldehyde are oxidated by iodine in the mixture of THF and ammonia water at room temperature to give p-tolunitrile and o-tolunitrile in 87.1% and 82.0% yield respectively.p-Tolunitrile is nitrated with fuming nitric acid in concentrated sulfuric acid below 0℃ to produce 4-methyl-3-nitrobenzonitrile in 88.4% yield,and for o-tolunitrile to afford 2-methyl-5-nitrobenzonitrile in 79.6% yield.Their structures are characterized by IR and 1H NMR spectra respectively.
文摘UO2(EPC)2(EPC=5-ethyl-3-pyridinecarboxylate)was synthesized by the hydrothermal reaction of UO2(NO3)2 ·6H2O with imazethapyr [2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl)-5-ethyl-3-pyridine-carboxylic acid] at 120 ℃,which 2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl group was removed under this condition to result in the formation of 5-ethyl-3-pyridinecarboxylate ligand(EPC).The structure and fluorescent property of the synthesized complex is also reported.CCDC:645641.
