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Biotechnol Prog. 2000 Nov-Dec;16(6):958-65.

Improved performances and control of beer fermentation using encapsulated alpha-acetolactate decarboxylase and modeling.

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LFBI, ENSAIA, 2 avenue de la ForĂȘt de Haye, BP 172, F-54505 Vandoeuvre les Nancy Cedex, France.


The use of the enzyme alpha-acetolactate decarboxylase allows the acceleration of beer fermentation/maturation because it shunts diacetyl formation, whose elimination is the rate-limiting step of the process. To obtain a cost reduction by using this exogenous enzyme, we propose a new process involving recoverable encapsulated alpha-acetolactate decarboxylase. The performance of traditional and new processes was investigated by a modeling approach. A simple model, focused on alpha-acetolactate and diacetyl profiles during beer fermentation, was set up. The simulated profiles are consistent with literature data. This study shows also that encapsulated alpha-acetolactate decarboxylase allows the acceleration of beer fermentation as efficiently as free alpha-acetolactate decarboxylase. The advantage of immobilized alpha-acetolactate decarboxylase versus free enzyme is that it is recoverable and reusable, which means a process cost reduction.

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