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Citation: WANG Jing, SONG Shaofang, LU Fusui. The Catalytic Activity and Stereoselectivity of Lipase Immobilized in Cetyl Trimethyl Ammonium Bromide/Sorbitan Monostearate Microemulsion-based Gel[J]. Chinese Journal of Applied Chemistry, ;2011, 28(4): 426-431. doi: 10.3724/SP.J.1095.2011.00237 shu

The Catalytic Activity and Stereoselectivity of Lipase Immobilized in Cetyl Trimethyl Ammonium Bromide/Sorbitan Monostearate Microemulsion-based Gel

1.
College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018

Corresponding author: SONG Shaofang,
Received Date: 22 April 2010
Available Online: 28 September 2010
Fund Project: 国家自然科学基金(20803044) (20803044)山东省自然科学基金(ZR2009DM032)资助项目 (ZR2009DM032)

Cetyl trimethyl ammonium bromide/sorbitan monostearate(Span-60) microemulsion-based gel(CTAB/Span-60 MBG) having good stability in aqueous solution was successfully prepared.The mass percentage of Span-60 in emulsifier mixture(EM,the mixture of n-butanol and Span-60) was determined.The catalytic activity and stereoselectivity of lipase immobilized in CTAB/Span-60 MBG were tested using the esterification of hexanoic acid and hexanol,the hydrolysis of α-glyceryl monostearate and the stereoselective esterification of racemic ibuprofen and octanol as probes,respectively.The results showed that CTAB/Span-60 MBG with good mechanical strength could be achieved when the mass percentage of Span-60 in EM was less than 57%.In organic solvent,the catalytic esterification activity of lipase in this MBG increased gradually with the increase of the content of Span-60 in EM at the first stage and reached maximum at 35% and then decreased slightly with further increase of the content,and was higher than that in CTAB MBG,within the investigated content of Span-60.This immobilized lipase could catalyze the hydrolysis of α-glyceryl monostearate in aqueous solution and the reaction conversion rate didn't change any more after 24 h.The catalytic hydrolytic activity decreased by 13.68% after 9 re-usage times.This suggests that lipase in CTAB/Span-60 MBG could be separated and reused.Lipase in this MBG also selectively catalyzed S-enantiomer ibuprofen to S-enantiomer ester and the excessive enantiomeric product(ee_e) of the latter gradually decreased with the proceeding of the reaction,but showing better stereoselectivity than CTAB MBG.As a promising carrier for immobilizing lipase,CTAB/Span-60 MBG could be used in biosynthesis and biotransformation not only in organic solvent but also in aqueous solution.
- microemulsion-based gel(MBG),
- immobilized lipase,
- catalytic activity,
- stereoselectivity,
- reaction conversion rate,
- enantiomeric excess(ee_e)
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