An amphiphilic ferrocene derivative 3-ferrocenyl-2-butylene acid(FCA) was synthesized. The mixed FCA/octadecylamine(ODA) monolayers on aqueous subphase were studied by means of surface pressure-molecule area(π-A) iso...An amphiphilic ferrocene derivative 3-ferrocenyl-2-butylene acid(FCA) was synthesized. The mixed FCA/octadecylamine(ODA) monolayers on aqueous subphase were studied by means of surface pressure-molecule area(π-A) isotherm, dπ/dA-A curve and the plot of the apparent area of ODA vs x(ODA). The results indicate that the FCA itself did not form monolayer, but the mixed FCA/ODA mono- layers were stable when the mole fraction of ODA was more than 25%, the mixed monolayers possessed the best stability and the highest incompressibility when the mole ratio of FCA to ODA is 1 to 1.展开更多
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
文摘An amphiphilic ferrocene derivative 3-ferrocenyl-2-butylene acid(FCA) was synthesized. The mixed FCA/octadecylamine(ODA) monolayers on aqueous subphase were studied by means of surface pressure-molecule area(π-A) isotherm, dπ/dA-A curve and the plot of the apparent area of ODA vs x(ODA). The results indicate that the FCA itself did not form monolayer, but the mixed FCA/ODA mono- layers were stable when the mole fraction of ODA was more than 25%, the mixed monolayers possessed the best stability and the highest incompressibility when the mole ratio of FCA to ODA is 1 to 1.
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.
