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ISBN-10: 1782620125

ISBN-13: 9781782620129

ISBN-10: 1849738106

ISBN-13: 9781849738101

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View Online 20 Chapter 2 10:35:22. 5% conversion. Consequently, a simple and efficient modulation method of adding Tween-80 leads to a dramatic improvement of the enzyme enantioselectivity in the hydrolysis of racemic ketoprofen ester. 2. Based on spectroscopic studies,25 the enhancement of the lipase activity and enantioselectivity at the lower pH could be attributed to the changes in the flexible and sensitive conformation of the lipase induced by tuning the biocatalyst microenvironment. 26 After terminating the reaction, the pH of the reaction mixture was adjusted to ca.

The lower solubility of n-hexane, n-octane, and isooctane in water may account for their lower molecular toxicity to the enzyme. The profiles of biocatalyst activity retention with incubation time were determined in both the single aqueous phase and the two-liquid phase systems without substrate. An exponential type of biocatalyst deactivation was observed in a neat aqueous buffer without organic solvent, with an estimated half-life of 21 h, indicating that some of the cells were lysed during the incubation period.

Consequently, n-hexane, n-octane, and isooctane were chosen as suitable candidates for achieving a better separation between the substrate and the product. The second criterion for the selection of a proper organic solvent was its effects on the enzyme activity and stability. 6, respectively. The log P of a solvent, the logarithm of the partition coefficient of the solvent in a standard mixture of 1-octanol and water, is a parameter often used for predicting its biocompatibility, and is usually more indicative of the dissolved solvent.

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Chemical biotechnology and bioengineering

by William

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