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Evaluation of D-amino acid oxidase from Rhodotorula gracilis for the production of α-keto acids: A reactor system

✍ Scribed by Simona Butò; Loredano Pollegioni; Luigi D'Angiuro; Mirella S. Pilone

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
679 KB
Volume
44
Category
Article
ISSN
0006-3592

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✦ Synopsis

This study reports on the development of a bioreactor for the production of a-keto acids from D,L-or D-amino acids using Rhodotorula gracilis o-amino acid oxidase. D-Amino acid oxidase was co-immobilized with catalase on Affi-Gel 10 matrix, and the reactor was operated as a continuous-stirred tank reactor (CSTR) or stirred tank with medium recycling conditions. The optimum substrate concentration and quantity of biocatalyst were determined (5 mM and 1.2 mg/L, respectively). Under optimum operating conditions, product formation was linearly related to both substrate and enzyme concentration, showing the system to be highly flexible. Under these conditions, in a stirred tank, over 90% conversion was achieved in 30 min with a maximum production of 0.23 g of pyruvic acid/day/enzyme units. Product was recovered by ion exchange chromatography. The operational stability of the reactor was high ( u p to 9.5 h of operation without loss of activity) and the inactivation half-life was not reached even after 18 h or 36 bioconversion cycles. This represents the first case of a reactor developed successfully with a o-amino acid oxidase. 0

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