Abstract
A cultural system, aimed at the production of glucoamylase with cells of a non-conventional yeast transformed for the enzyme expression, Kluyveromyces lactis JA6-GAA was realised. Glucoamylase production was accomplished in a reactor operating in fed batch mode to avoid limitations with respect to oxygen transfer, and achieve high cell density. A mathematical model able to describe batch and fed batch operations was developed. The theoretical and experimental approach permitted to catch sight of possible physiological changes in the producer strain and set up a suitable fed-batch run to achieve a higher cell density.
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