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Biological production of acetaldehyde from ethanol using non-growingPichia pastoris whole cells

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Abstract

Acetaldehyde has been produced biologically using whole-cellPichia pastoris in a semibatch fermentor. Ethanol and air were fed continuously, and the product, acetaldehyde, was removed by the air stream. Operation of the reactor exceeded 100 h, maintaining high alcohol oxidase activity. Low cell-mass concentration (9.9 g/L) minimized product inhibition. Ethanol concentration in the broth, oxygen concentration in the air, and pH were evaluated for their effects on the fermentation process.

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Abbreviations

Ca, Ce :

acetaldehyde and ethanol conc. in liquid phase (mol/L).

Cai, Cei :

initial acetaldehyde and ethanol conc. (mol/L).

Ca *, Ce * :

acetaldehyde and ethanol cone, in gas phase (mol/L).

Ca, in:

input acetaldehyde conc. (mol/L).

F :

volumetric gas flow rate (L/h).

R a :

rate equation (mol/L/h).

t :

time (h).

V 1, Vg :

liquid and vapor phase volume (L).

Vo :

reactor total volume (Vg+V1) (L).

(dC a /dt)strp, (dCe / dt)strp :

the stripping rate of acetaldehyde and ethanol (mol/L/h).

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Chiang, HK., Foutch, G.L. & Fish, W.W. Biological production of acetaldehyde from ethanol using non-growingPichia pastoris whole cells. Appl Biochem Biotechnol 28, 513–525 (1991). https://doi.org/10.1007/BF02922630

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