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Efficient water removal in lipase-catalyzed esterifications using a low-boiling-point azeotrope
Youchun Yan1, Uwe T Bornscheuer, Rolf D Schmid
1Institute of Technical Biochemistry, University of Stuttgart, Allmandring 31, D-70569 Stuttgart, Germany.
Biotechnology and Bioengineering
|February 22, 2002
Summary
Efficient water removal using an ethyl methylketone and hexane solvent mixture enhances lipase-catalyzed ester synthesis. This method optimizes Candida antarctica lipase B (CAL-B) activity and achieves high yields for sugar fatty-acid esters.
Area of Science:
- Biocatalysis
- Enzyme Engineering
- Green Chemistry
Background:
- Lipase-catalyzed ester synthesis requires efficient water removal to drive high conversions.
- Maintaining enzyme activity necessitates reaction temperatures compatible with biocatalyst stability.
Purpose of the Study:
- To develop an efficient method for water removal in lipase-catalyzed ester synthesis.
- To optimize reaction conditions for synthesizing sugar fatty-acid esters using Candida antarctica lipase B (CAL-B).
Main Methods:
- Utilized a solvent mixture of ethyl methylketone (EMK) and hexane (4:1, v/v) for azeotropic water removal.
- Employed membrane vapor permeation to separate water from the solvent azeotrope.
- Investigated the reusability and stability of immobilized CAL-B.
Main Results:
- Achieved 93% yield for glucose stearate synthesis under optimized conditions.
- CAL-B retained 86% activity after 14 days at 59°C and was reused for seven cycles.
- Optimal azeotropic distillation temperature (59°C) matched CAL-B's optimal activity temperature.
Conclusions:
- The EMK/hexane solvent system effectively removes water, enhancing lipase-catalyzed esterification.
- Immobilization of CAL-B on a magnetic carrier improved biocatalyst separation and reusability.
- Reaction conditions, including temperature and fatty-acid chain length, significantly impact ester synthesis conversion.