Electronic Journal of Biotechnology ISSN: 0717-3458
  © 2008 by Universidad Católica de Valparaíso -- Chile
Vol. 11 No. 1, Issue of January 15, 2008
 


Table 5. The substrate-concentration independent enantiomeric ratio for the various batches, revealing evidence of the effect of methyl branching and confirming the effect of water activity on the esterification reactions. The value of the equilibrium constant, K, is found in parentheses after the enantiomeric ratio if K was not zero.


Ibuprofen Concentration

Enatiomeric Ratio

 Isooctane

 aw = 0.73 

14.9 ± 2.7

aw = 0.59

9.7 ± 1.9

aw = 0.43

4.0 ± 0.8

 2,5-Dimethylhexane 

aw = 0.73

11.0 ± 1.6

aw = 0.59

6.5 ± 1.4

aw = 0.43

NR

 2-Methylheptane

aw = 0.73

10.1 ± 1.4

aw = 0.59

6.1 ± 1.3

aw = 0.43

NR

 n-Octane

aw = 0.73

6.6 ± 1.1

aw = 0.59

3.4 ± 0.3

aw = 0.43

2.0 ± 0.4
(7.3 ± 1.3)

NR: indicates no reaction was observed.


Supported by UNESCO / MIRCEN network