Bioconversion of N-Butylglucamine to 6-Deoxy-6-butylamino Sorbose by Gluconobacter oxydans
摘要:
Gluconobacter oxydans has the unique ability to regioselectively and rapidly oxidize sorbitol and other erythro saccharides. In this report a new process is described by which N-butylglucamine is regioselectively oxidized by the organism. A large-scale process is described by which N-butylglucamine can be converted to an intermediate (6-deoxy-6-butylaminosorbose) which can be readily converted to N-butyldeoxynojirimycin by catalytic hydrogenation. The primary process variables of temperature, pH, and added acids and salts were investigated in laboratory bioreactors. Since degradation of the sorbose product was rapid above room temperature, significant enhancement of the selectivity was achieved by lowering the temperature at which the bioconversion was run. The optimum temperature for this conversion was 12-15 degreesC. The pH maximum of the bioconversion was 5.5-6.0. However, the small gain in rate relative to pH 5.0 was at least offset by the increase in degradation of the product at the higher pH. Nitrate salts of N-butylglucamine could replace chloride salts, but sulfate, acetate, and phosphate salts could not. Sulfate in particular led to inhibition of the conversion, while phosphate and acetate led to increased degradation. At temperatures in the range of 1215 degreesC, pH of around 5.0 and substrate concentrations of 0.2 M, Gluconobacter oxydans catalyzed bioconversion to 6-deoxy-6-butylaminosorbose with yields approaching 95%. These conditions were used to scale this process to 5500-L scale.
Bioconversion of N-Butylglucamine to 6-Deoxy-6-butylamino Sorbose by Gluconobacter oxydans
摘要:
Gluconobacter oxydans has the unique ability to regioselectively and rapidly oxidize sorbitol and other erythro saccharides. In this report a new process is described by which N-butylglucamine is regioselectively oxidized by the organism. A large-scale process is described by which N-butylglucamine can be converted to an intermediate (6-deoxy-6-butylaminosorbose) which can be readily converted to N-butyldeoxynojirimycin by catalytic hydrogenation. The primary process variables of temperature, pH, and added acids and salts were investigated in laboratory bioreactors. Since degradation of the sorbose product was rapid above room temperature, significant enhancement of the selectivity was achieved by lowering the temperature at which the bioconversion was run. The optimum temperature for this conversion was 12-15 degreesC. The pH maximum of the bioconversion was 5.5-6.0. However, the small gain in rate relative to pH 5.0 was at least offset by the increase in degradation of the product at the higher pH. Nitrate salts of N-butylglucamine could replace chloride salts, but sulfate, acetate, and phosphate salts could not. Sulfate in particular led to inhibition of the conversion, while phosphate and acetate led to increased degradation. At temperatures in the range of 1215 degreesC, pH of around 5.0 and substrate concentrations of 0.2 M, Gluconobacter oxydans catalyzed bioconversion to 6-deoxy-6-butylaminosorbose with yields approaching 95%. These conditions were used to scale this process to 5500-L scale.
[EN] PROCESS FOR PREPARATION OF 1,5-(ALKYLIMINO)-1,5-DIDEOXY-D-GLUCITOL AND DERIVATIVES THEREOF
申请人:G.D. SEARLE & CO.
公开号:WO1991017145A1
公开(公告)日:1991-11-14
(EN) Process for the preparation of 1,5-(alkylimino)-1,5-dideoxy-D-glucitol and derivatives thereof. Described is a process for the preparation of 1,5-(n-butylimino)-1,5-dideoxy-D-glucitol and similar compounds and to the use of an adsorption hydrogenation protocol.(FR) Procédé de préparation de 1,5-(alkylimino)-1,5-didésoxy-D-glucitol et de ses dérivés. L'invention concerne un procédé de préparation de 1,5-(n-butylimino)-1,5-didésoxy-D-glucitol ainsi que de composés similaires, et l'emploi d'un protocole d'hydrogénation par adsorption.