Using capillary zone electrophoresis,the enantiomers resolution of 13 pharmaceuticals including non-amide,primary amine,the secondary amine and the tertiary amine was studied with highly sulfated – α(β,γ)-cyclodex...Using capillary zone electrophoresis,the enantiomers resolution of 13 pharmaceuticals including non-amide,primary amine,the secondary amine and the tertiary amine was studied with highly sulfated – α(β,γ)-cyclodextrins(HS-α(β,γ)-CD) as chiral selector,It was found a good resolution effect for the amide chiral pharmaceuticals,especially for tertiary amine.Through the primary analysis of chiral resolution mechanism,it was believed there be the static gravitational action in addition to space matches and hydrogen bonding between highly sulfated cyclodextrins and the amine drugs.With mobility shift method,Determination of binding constants between chlorpheniramine,hydrochloride isoprenaline,naphthylethylamine and HS-β-CD showed that the binding constant order of chlorpheniramine > hydrochloride isoprenaline > naphthylethylamine,and that highly sulfonated cyclodextrins and the tertiary amine the strongest action force.展开更多
The sulfurous water deposit exploitation in volcanic, swamp, or wetland regions, represents an alternative option for potable water supply in cities and communities around the world. However, before its consumption, i...The sulfurous water deposit exploitation in volcanic, swamp, or wetland regions, represents an alternative option for potable water supply in cities and communities around the world. However, before its consumption, it must be treated by the application of physicochemical or biological methods with the ability to separate high contents in sulfates, hydrogen sulphite and sulphides which have laxative, allergic and toxic properties in humans. Conventional methods require the supply of chemical compounds or the adequate control of different parameters such as pH, temperature, etc., and the constant maintenance within their reactors. For these reasons, the systems could have elevated operating costs and require additional steps to enable the treatment of its separated products and the final disposal of its residual waste generated. In this research, compound parabolic collectors are implemented for the use of solar energy radiation, UV-B type, in Solar Advanced Oxidation Processes in H2O2/O3/UVsolar homogeneous phase. Its application during the pre-treatment of four sulfur water wells from the region of Puebla, Mexico, demonstrated its ability to transform their sulfur compounds in sulfates of easy removal by a later stage of reverse osmosis, in an approximately 15 min treatment time process.展开更多
文摘Using capillary zone electrophoresis,the enantiomers resolution of 13 pharmaceuticals including non-amide,primary amine,the secondary amine and the tertiary amine was studied with highly sulfated – α(β,γ)-cyclodextrins(HS-α(β,γ)-CD) as chiral selector,It was found a good resolution effect for the amide chiral pharmaceuticals,especially for tertiary amine.Through the primary analysis of chiral resolution mechanism,it was believed there be the static gravitational action in addition to space matches and hydrogen bonding between highly sulfated cyclodextrins and the amine drugs.With mobility shift method,Determination of binding constants between chlorpheniramine,hydrochloride isoprenaline,naphthylethylamine and HS-β-CD showed that the binding constant order of chlorpheniramine > hydrochloride isoprenaline > naphthylethylamine,and that highly sulfonated cyclodextrins and the tertiary amine the strongest action force.
文摘The sulfurous water deposit exploitation in volcanic, swamp, or wetland regions, represents an alternative option for potable water supply in cities and communities around the world. However, before its consumption, it must be treated by the application of physicochemical or biological methods with the ability to separate high contents in sulfates, hydrogen sulphite and sulphides which have laxative, allergic and toxic properties in humans. Conventional methods require the supply of chemical compounds or the adequate control of different parameters such as pH, temperature, etc., and the constant maintenance within their reactors. For these reasons, the systems could have elevated operating costs and require additional steps to enable the treatment of its separated products and the final disposal of its residual waste generated. In this research, compound parabolic collectors are implemented for the use of solar energy radiation, UV-B type, in Solar Advanced Oxidation Processes in H2O2/O3/UVsolar homogeneous phase. Its application during the pre-treatment of four sulfur water wells from the region of Puebla, Mexico, demonstrated its ability to transform their sulfur compounds in sulfates of easy removal by a later stage of reverse osmosis, in an approximately 15 min treatment time process.
