The immobilized technique of manganese peroxidase(MnP) in gelatin-containing microemulsion-based gels and the effects of storage time and reuse times on its catalytic activity were studied. The results show that the M...The immobilized technique of manganese peroxidase(MnP) in gelatin-containing microemulsion-based gels and the effects of storage time and reuse times on its catalytic activity were studied. The results show that the MnP immobilized together with Mn 2+ and H_2O_2 could effectively oxidize syringaldazine in n-heptane. The immobilized MnP still had a high catalytic activity after one-month storage under a freezing condition. The reuse times have a relation to the amount of the immobilized H_2O_2. When the amount of the immobilized H_2O_2 is sufficient, the microemulsion-based gels containing MnP could be used many times.展开更多
Introduction The formation of gelatin-containing mieroemulsionbased gels（MBGs） was first described in 1986 and the physical/structural characterization was carried out by a number of groups with a variety of techni...Introduction The formation of gelatin-containing mieroemulsionbased gels（MBGs） was first described in 1986 and the physical/structural characterization was carried out by a number of groups with a variety of techniques including tracer diffusion, electrical conductivity, NMR, X-ray and small angle neutron scattering. The MBGs were proposed to comprise an extensive, rigid, interconnected network of gelatin/water rods stabilized by a monolayer of surfactant, in coexistence with a po- pulation of conventional W/O microemulsion droplets.展开更多
CTAB/TX-100 microemtdsion-based gel（MBG）, which could be soaked in aqueous solution for a long time without mechanical strength and shape changes, was successfully prepared. Lipase immobilized in this gel had a high...CTAB/TX-100 microemtdsion-based gel（MBG）, which could be soaked in aqueous solution for a long time without mechanical strength and shape changes, was successfully prepared. Lipase immobilized in this gel had a higher activity than that in CTAB MBG when catalyzed the esterification reaction between n-hexanoic acid and n-octanol and its enantioselectivity was slightly higher when catalyzed the stereoselective esterification reaction between racemic ibuprofen and n-octanol. In aqueous solution, lipase in CTAB/TX-100 MBG could catalyze smoothly the hydrolysis reaction of olive oil and could be reused many times without the evident change of MBG mechanical strength although its activity decreased 41.8% after nine-time recycles.展开更多
The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/is...The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/isooctane.The results of kinetic study showed that the reaction follows a Ping\|Pong Bi\|Bi mechanism.The values of apparent kinetic parameters were determined.Lipase has also been immobilized in gelatin\|containing AOT microemulsion\|based organogels (MBGs) for retention of catalytic activity.These lipase\|containing MBGs proved to be a solid\|phase catalysts for use in apolar organic solvents,retaining its higher activity after many runs of esterification reactions.展开更多
Based on an unusual reversible sol-gel transition phenomenon. a novel method for the fabrication of a lipase electrode was developed. The response characteristics of the biosensor was studied by potentiometric techniq...Based on an unusual reversible sol-gel transition phenomenon. a novel method for the fabrication of a lipase electrode was developed. The response characteristics of the biosensor was studied by potentiometric technique using olive oil as substrate. After optimization, the lipase electrode demonstrated high activity and good stability.展开更多
文摘The immobilized technique of manganese peroxidase(MnP) in gelatin-containing microemulsion-based gels and the effects of storage time and reuse times on its catalytic activity were studied. The results show that the MnP immobilized together with Mn 2+ and H_2O_2 could effectively oxidize syringaldazine in n-heptane. The immobilized MnP still had a high catalytic activity after one-month storage under a freezing condition. The reuse times have a relation to the amount of the immobilized H_2O_2. When the amount of the immobilized H_2O_2 is sufficient, the microemulsion-based gels containing MnP could be used many times.
基金Supported by the Natural Science Foundation of Shandong Province in China(No.Y2003B01).
文摘Introduction The formation of gelatin-containing mieroemulsionbased gels（MBGs） was first described in 1986 and the physical/structural characterization was carried out by a number of groups with a variety of techniques including tracer diffusion, electrical conductivity, NMR, X-ray and small angle neutron scattering. The MBGs were proposed to comprise an extensive, rigid, interconnected network of gelatin/water rods stabilized by a monolayer of surfactant, in coexistence with a po- pulation of conventional W/O microemulsion droplets.
基金Supported by the National Natural Science Foundation of China(No. 20803044)the Foundation of Key Laboratory of Colloid and Interface Chemistry of Ministry of Education,Shandong University,China(No.200714)
文摘CTAB/TX-100 microemtdsion-based gel（MBG）, which could be soaked in aqueous solution for a long time without mechanical strength and shape changes, was successfully prepared. Lipase immobilized in this gel had a higher activity than that in CTAB MBG when catalyzed the esterification reaction between n-hexanoic acid and n-octanol and its enantioselectivity was slightly higher when catalyzed the stereoselective esterification reaction between racemic ibuprofen and n-octanol. In aqueous solution, lipase in CTAB/TX-100 MBG could catalyze smoothly the hydrolysis reaction of olive oil and could be reused many times without the evident change of MBG mechanical strength although its activity decreased 41.8% after nine-time recycles.
文摘The esterification reactions of octanoic acid with 1\|octanol catalyzed by Candida lypolytical (CL) lipase was studied in water\|in\|oil microemulsions formed by water/bis\|(2\|ethylhexyl)sulfosuccinate sodium(AOT)/isooctane.The results of kinetic study showed that the reaction follows a Ping\|Pong Bi\|Bi mechanism.The values of apparent kinetic parameters were determined.Lipase has also been immobilized in gelatin\|containing AOT microemulsion\|based organogels (MBGs) for retention of catalytic activity.These lipase\|containing MBGs proved to be a solid\|phase catalysts for use in apolar organic solvents,retaining its higher activity after many runs of esterification reactions.
文摘Based on an unusual reversible sol-gel transition phenomenon. a novel method for the fabrication of a lipase electrode was developed. The response characteristics of the biosensor was studied by potentiometric technique using olive oil as substrate. After optimization, the lipase electrode demonstrated high activity and good stability.
