Rutin was acylated with stearic acid in esterification reaction catalyzed by immobilized Candida antarctica lipase B(Novozym 435).The results suggested that the regioselectivity of the lipase-catalyzed esterification ...Rutin was acylated with stearic acid in esterification reaction catalyzed by immobilized Candida antarctica lipase B(Novozym 435).The results suggested that the regioselectivity of the lipase-catalyzed esterification of rutin was specific at the C4’’’ position of the rhamnose moiety.The monolayer of dioleoylphosphatidylcholine(DOPC) was used as the model membrane to study their molecular interaction with RS.The miscibility of DOPC/RS mixed monolayers has been investigated by Langmuir film balance to yield quantitative information on the nature of the molecular interaction,which could provide valuable insights to reveal the antioxidative activity mechanism of flavonoids.Pure RS and pure DOPC were capable of forming monolayers with liquid-phase at the air/water interface.The two components of DOPC/RS monolayer were miscible throunghout the mixture composition range.The effects of the temperature of the subphase on the miscibility and molecular interaction of DOPC/RS monolayers were investigated.The miscibility was more excellent at higher temperature.The condensing effect of RS,which represented the attractive forces between DOPC and RS,could be ascribed to the match of molecular shapes of RS and DOPC on the monolayers packing.展开更多
1,2-二棕榈酰-sn-甘油-3-磷脂酰胆碱(DPPC,1)不仅可作为药用辅料,还可作为外源性肺表面活性剂,治疗新生儿呼吸窘迫综合征(NRDS)。甘油磷脂酰胆碱(GPC,2)在DCM中,在4-二甲氨基吡啶(DMAP)和二环己基碳二亚胺(DCC)的作用下,与棕榈酸(PA,3)...1,2-二棕榈酰-sn-甘油-3-磷脂酰胆碱(DPPC,1)不仅可作为药用辅料,还可作为外源性肺表面活性剂,治疗新生儿呼吸窘迫综合征(NRDS)。甘油磷脂酰胆碱(GPC,2)在DCM中,在4-二甲氨基吡啶(DMAP)和二环己基碳二亚胺(DCC)的作用下,与棕榈酸(PA,3)反应得DPPC。但发现产生了某一杂质,严重影响产物的纯化。分离、纯化后经MS和1 H NMR确证,该杂质为1,1'-亚甲基双(4-二甲氨基吡啶鎓)双氯化物。把反应溶剂改为乙腈,并将DMAP投料时物质的量比例从3降低至1,目标产物1的收率由33.20%提升至49.18%,纯度99.92%。展开更多
文摘Rutin was acylated with stearic acid in esterification reaction catalyzed by immobilized Candida antarctica lipase B(Novozym 435).The results suggested that the regioselectivity of the lipase-catalyzed esterification of rutin was specific at the C4’’’ position of the rhamnose moiety.The monolayer of dioleoylphosphatidylcholine(DOPC) was used as the model membrane to study their molecular interaction with RS.The miscibility of DOPC/RS mixed monolayers has been investigated by Langmuir film balance to yield quantitative information on the nature of the molecular interaction,which could provide valuable insights to reveal the antioxidative activity mechanism of flavonoids.Pure RS and pure DOPC were capable of forming monolayers with liquid-phase at the air/water interface.The two components of DOPC/RS monolayer were miscible throunghout the mixture composition range.The effects of the temperature of the subphase on the miscibility and molecular interaction of DOPC/RS monolayers were investigated.The miscibility was more excellent at higher temperature.The condensing effect of RS,which represented the attractive forces between DOPC and RS,could be ascribed to the match of molecular shapes of RS and DOPC on the monolayers packing.
文摘1,2-二棕榈酰-sn-甘油-3-磷脂酰胆碱(DPPC,1)不仅可作为药用辅料,还可作为外源性肺表面活性剂,治疗新生儿呼吸窘迫综合征(NRDS)。甘油磷脂酰胆碱(GPC,2)在DCM中,在4-二甲氨基吡啶(DMAP)和二环己基碳二亚胺(DCC)的作用下,与棕榈酸(PA,3)反应得DPPC。但发现产生了某一杂质,严重影响产物的纯化。分离、纯化后经MS和1 H NMR确证,该杂质为1,1'-亚甲基双(4-二甲氨基吡啶鎓)双氯化物。把反应溶剂改为乙腈,并将DMAP投料时物质的量比例从3降低至1,目标产物1的收率由33.20%提升至49.18%,纯度99.92%。
