Enzyme stabilization in magnetically-separable mesoporous silica via ship-in-a-bottle approach for uses in nonaqueous solvent

Byoungsoo Lee, Ee Taek Hwang, Man Bock Gu, Jungbae Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Magnetically-separable mesocellular silica (Mag-MSU-F), with larger mesocellular pores of 38 nm connected by smaller window mesopores of 18 nm and deposited by magnetic nanoparticles, were used for the immobilization and stabilization of subtilisin Carlsberg (SC) from Bacillus licheniformis in the form of nanoscale enzyme reactors (NERs). NERs of SC (NER-SC) were prepared via a simple two-step process: enzyme adsorption and crosslinking. The crosslinked enzymes in large mesocellular pores cannot leach out through smaller window pores, creating a ship-in-a-bottle approach as one of the stabilization mechanisms. The other stabilization mechanism would be the multi-point covalent linkages that can effectively prevent the denaturation of enzymes. As a result, NER-SC maintained 66% of initial activity even after incubation under shaking (200 rpm) for 15 days while free and adsorbed SC showed less than 1% and 2.8% of initial activities, respectively. Stable NER-SC was successfully used for the transesterification of N-acetyl-L-phenylalanine ethyl ester (APEE) with n-propanol in isooctane. Magnetic separation of Mag-MSU-F facilitated the repeated uses of stable NER-SC. This is the first demonstration for the uses of stable and magnetically-separable NERs in organic solvents, which will create a great potential for various synthetic reactions including the biodiesel production.

Original languageEnglish
Title of host publicationAIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings
PublisherAmerican Institute of Chemical Engineers
ISBN (Print)9780816910731
Publication statusPublished - 2012
Event2012 AIChE Annual Meeting, AIChE 2012 - Pittsburgh, PA, United States
Duration: 2012 Oct 282012 Nov 2


Other2012 AIChE Annual Meeting, AIChE 2012
Country/TerritoryUnited States
CityPittsburgh, PA

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)


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