Abstract
A Candida rugosa lipase immobilized on polypropylene powder was employed as the biocatalyst for the enantioselective hydrolysis of (R, S)-suprofen 2,2,2-trifluorothioester in cyclohexane, in which trioctylamine was added as the catalyst to perform in situ racemization of the remaining (R)-thioester. A hollow-fiber membrane was also integrated with the dynamic kinetic resolution process in order to continuously extract the desired (S)-suprofen into an aqueous solution containing NaOH. A kinetic model for the whole process (operating in batch and feed-batch modes) was developed, in which enzymatic hydrolysis and deactivation, lipase activation, racemization and non-enantioselective hydrolysis of the substrate by trioctylamine, and reactive extraction of (R)- and (S)-suprofen into the aqueous phase in the membrane were considered. Theoretical predictions from the model for the time-course variations of substrate and product concentrations in each phase were compared with experimental data.
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Abbreviations
- A :
-
membrane surface area (cm2)
- (B):
-
trioctylamine concentration (mM)
- (E):
-
effective enzyme concentration (mg cm−3)
- (Et):
-
initial enzyme concentration (mg cm−3)
- E*:
-
enantiomeric ratio, defined as k2AKmB/k2BKmA
- eep:
-
enantiomeric excess for suprofen products
- ees:
-
enantiomeric excess for thioester substrates
- f1, f2:
- f3, f4:
- (H+):
-
hydrogen ion concentration (mM)
- K d :
-
dissociation constant of (R)- or (S)-suprofen in the aqueous phase (mM)
- K P :
-
partition coefficient of (R)- or (S)-suprofen between cyclohexane and the aqueous phase; in other words [(QB)/(QBW)]eq or [(QA)/(QAW)]eq
- K w :
-
dissociation constant of water (mM2)
- KmA, KmB:
-
Michaelis-Menten constant for (S)- or (R)-thioester (mM)
- k h :
-
rate constant for the non-stereoselective hydrolysis of thioester (h−1)
- k i :
-
interconversion constant for (R)- or (S)-thioester (h−1)
- k over :
-
overall mass transfer coefficient for suprofen in the membrane (cm2 h−1)
- k1, k2:
-
enzyme deactivation constants in the series mechanism (h−1)
- k2A, k2B:
-
kinetic constant for (S)- or (R)-thioester in Michaelis-Menten kinetics (mM cm3 mg−1 h−1)
- (Na+):
-
sodium ion concentration (mM)
- (OH−):
-
hydroxide ion concentration (mM)
- (QA), (QB):
-
concentrations of (S)- and (R)-suprofen in isooctane (mM)
- (QA–W), (QB–W):
-
concentrations of ionized (S)- and (R)-suprofen in the aqueous phase (mM)
- (QAW), (QBW):
-
concentrations of (S)- and (R)-suprofen in the aqueous phase (mM)
- r :
-
fraction of enzyme activity for the intermediate lipase
- (SA), (SB):
-
concentrations of (S)- and (R)-thioester in isooctane (mM)
- t :
-
time (h)
- VA, VB:
-
reaction rates for (S)- and (R)-thioesters (mM h−1)
- VO, Vw:
-
volumes of the organic and aqueous phases (cm3)
- XA, XB, Xt:
-
conversions of (S)-, (R)- and (R, S)-thioesters
- eq:
-
at equilibrium
- 0:
-
initially
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Acknowledgements
The financial support from the Chinese National Science Council with Grant NSC90-2214-E-006-021 is appreciated.
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Wang, L.W., Cheng, Y.C. & Tsai, S.W. Process modeling of the lipase-catalyzed dynamic kinetic resolution of (R, S)-suprofen 2,2,2-trifluoroethyl thioester in a hollow-fiber membrane. Bioprocess Biosyst Eng 27, 39–49 (2004). https://doi.org/10.1007/s00449-004-0379-8
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DOI: https://doi.org/10.1007/s00449-004-0379-8