AIM The purpose is to lay a theoretical foundation for the development of L Ψ ephedrine hydrochloride as a novel drug. METHODS L Ψ ephedrine and its hydrochloride were acquired by purifying and recrystallizing crude...AIM The purpose is to lay a theoretical foundation for the development of L Ψ ephedrine hydrochloride as a novel drug. METHODS L Ψ ephedrine and its hydrochloride were acquired by purifying and recrystallizing crude products prepared using enzyme engineering techniques. Their structural and chemical properties were analyzed by TLC, DSC, IR, UV, EIMS m/z , optical activity and elementary analysis.RESULTS The average yield and purity of refined L Ψ ephedrine were 65.0% and 99.96%, and those of L Ψ ephedrine hydrochloride were 83.3% and 99.8%, respectively. Instrumental analysis showed that all of their tested properties and structural were consistent with the theoretical data. CONCLUSION L Ψ ephedrine and its hydrochloride with high purity were obtained and their properties were confirmed.展开更多
It is necessary to treat wastewater in a more environment-friendly fashion.Vegetated submerge bed constructed wetlands (CWs) has become the focus of the research in this field. In this paper, the overall capacity of v...It is necessary to treat wastewater in a more environment-friendly fashion.Vegetated submerge bed constructed wetlands (CWs) has become the focus of the research in this field. In this paper, the overall capacity of vertical subsurface flow CWs in the removal of pollutants from municipal wastewater effluent and the effects of the depth of vegetated submerged bed on the removal efficiency were studied. The results showed that the COD, NH+4-N and TN could be removed effectively in the vertical subsurface flow CWs and the best efficiency was obtained from the 10 cm run. However, the TP removal was not effective in all vertical CWs. A shallow depth of vegetated submerged bed may avoid the risk of substrate plugging effectively, and may keep a stable operation of CWs in long term. Decreasing the depth of vegetated submerged bed could create a sufficient aerobic circumstance in which the concentration of DO (dissolved oxygen) in bed was super saturation.展开更多
文摘AIM The purpose is to lay a theoretical foundation for the development of L Ψ ephedrine hydrochloride as a novel drug. METHODS L Ψ ephedrine and its hydrochloride were acquired by purifying and recrystallizing crude products prepared using enzyme engineering techniques. Their structural and chemical properties were analyzed by TLC, DSC, IR, UV, EIMS m/z , optical activity and elementary analysis.RESULTS The average yield and purity of refined L Ψ ephedrine were 65.0% and 99.96%, and those of L Ψ ephedrine hydrochloride were 83.3% and 99.8%, respectively. Instrumental analysis showed that all of their tested properties and structural were consistent with the theoretical data. CONCLUSION L Ψ ephedrine and its hydrochloride with high purity were obtained and their properties were confirmed.
基金supported by the Scientific Research Foundation of the State Human Resource Ministry for Returned Chinese Scholars, China (Grant No.SLZ2008012)Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. SJ08-ZT07)+1 种基金the Research Program of the Education Department of Shannxi Province of China (Grant No. 08JK327)Program for Changjiang Scholars and Innovative Research Team in University(PCSIRT) (Grant No. IRT0853)
文摘It is necessary to treat wastewater in a more environment-friendly fashion.Vegetated submerge bed constructed wetlands (CWs) has become the focus of the research in this field. In this paper, the overall capacity of vertical subsurface flow CWs in the removal of pollutants from municipal wastewater effluent and the effects of the depth of vegetated submerged bed on the removal efficiency were studied. The results showed that the COD, NH+4-N and TN could be removed effectively in the vertical subsurface flow CWs and the best efficiency was obtained from the 10 cm run. However, the TP removal was not effective in all vertical CWs. A shallow depth of vegetated submerged bed may avoid the risk of substrate plugging effectively, and may keep a stable operation of CWs in long term. Decreasing the depth of vegetated submerged bed could create a sufficient aerobic circumstance in which the concentration of DO (dissolved oxygen) in bed was super saturation.
