M.A. Quezada, J.D. Carballeira and J.V. SinisterraDepartment of Chemistry, Faculty of Chemical Engineering, University of Trujillo, Peru
Industrial Biotransformations Service, Scientific Park of Madrid, C/Santiago Grisolia No. 2, Parque Tecnológico de Madrid, 28760 Tres Cantos, Madrid, Spain
Industrial Biotransformations Service, Scientific Park of Madrid, C/Santiago Grisolia No. 2, Parque Tecnológico de Madrid, 28760 Tres Cantos, Madrid, Spain
Biotransformations Group, Organic and Pharmaceutical Chemistry Department, Faculty of Pharmacy, Universidad Complutense, 28040 Madrid, Spain
Abstract
Monascus kaoliang was selected after a microbial screening as a highly active and selective whole cell catalyst for the reduction of ketones. In the present paper we describe the optimum growing conditions and an interesting immobilization procedure by adsorption in polyurethane foams (PUFs). This methodology is easy to perform and the immobilized catalyst is active, stable and reusable. The use of different co-substrates for cofactor regeneration was also tested and iso-propanol (i-PrOH) was found as the best co-substrate, as it leads to a catalyst reusable for 17 cycles, displaying better NADH regeneration properties than others e.g., glucose (10 cycles) or saccharose (6 cycles). The reduction of different prochiral ketones showed that the ketone reductase activity of this mould follows the Prelog’s rule and kinetic experiments demonstrated that the process follows a pseudo-first kinetic order.
Monascus kaoliang was selected after a microbial screening as a highly active and selective whole cell catalyst for the reduction of ketones. In the present paper we describe the optimum growing conditions and an interesting immobilization procedure by adsorption in polyurethane foams (PUFs). This methodology is easy to perform and the immobilized catalyst is active, stable and reusable. The use of different co-substrates for cofactor regeneration was also tested and iso-propanol (i-PrOH) was found as the best co-substrate, as it leads to a catalyst reusable for 17 cycles, displaying better NADH regeneration properties than others e.g., glucose (10 cycles) or saccharose (6 cycles). The reduction of different prochiral ketones showed that the ketone reductase activity of this mould follows the Prelog’s rule and kinetic experiments demonstrated that the process follows a pseudo-first kinetic order.
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