A new biocatalytic route to enantiopure N-carbamoyl amino acids by fast enzyme screening
摘要:
The enantioselective enzymatic deamidation of (rac)-N-carbamoyl amino acid amides (Cbm-AA-NH2) to enantiopure (L)-N-carbamoyl amino acids (Cbm-AA-OH) is described for the first time. Via fast screening methods of biocatalysts several proteases like Chirazyme P1, Chirazyme P2 and Subtilisin were identified, which give conversions of up to 47% and >98% ee. This conversion is most productive on aliphatic and primary amino acids. (C) 2003 Elsevier Science Ltd. All rights reserved.
METHOD FOR THE CONVERSION OF METHYLMERCAPTOPROPIONALDEHYDE FORMED FROM CRUDE ACROLEIN AND CRUDE METHYL MERCAPTAN
申请人:Steffan Martin
公开号:US20130245318A1
公开(公告)日:2013-09-19
A reactive rectification column suitable for the production of 2-hydroxy-4-methylmercaptobutyric acid and/or methionine contains a weir having a height of 100 mm or more.
Preparation and use of methionylmethionine as feed additive for fish and crustaceans
申请人:Kobler Christoph
公开号:US09095161B2
公开(公告)日:2015-08-04
An animal feed mixture containing DL-methionyl-DL-methionine and salts thereof for animals kept in aquacultures is provided. Methods for preparing DL-methionyl-DL-methionine of formula (I)
and methods to fractionate the diasteriomeric forms obtained are also provided.
The invention relates to feed additives containing dipeptides or salts thereof, in which one amino acid residue of the dipeptide is a DL-methionyl residue and the other amino acid residue of the dipeptide is an amino acid in the L-configuration selected from lysine, threonine, tryptophan, histidine, valine, leucine, isoleucine, phenylalanine, arginine, cysteine and cystine; feed mixtures containing these additives and method of producing the dipeptides.
A reaction system suitable for production of a methionine salt contains a reactive rectification column containing a weir having a height of 100 mm or more.
适用于甲硫氨酸盐生产的反应系统包含一个反应精馏塔,其中包含一个高度为100毫米或更高的堰板。
Process for the production of methionine
申请人:Kobayashi Yoichi
公开号:US20050176115A1
公开(公告)日:2005-08-11
A practical method for producing methionine is presented. When a substance capable of producing methionine through hydrolysis is used as raw material and converted into methionine by using a biocatalyst, the biocatalyst is repeatedly usable and the accumulation amount of methionine dissolved in the reaction solution is increased, and methionine is obtained in a solid form from the reaction solution. Specifically, the present invention relates to a method for producing methionine comprising the following steps: a first step of converting raw material capable of producing methionine through hydrolysis of 2-amino-4-methylthiobutyronitrile, and 2-amino-4-methylthiobutanamide or the like in an aqueous ammonia solution, into methionine-containing aqueous ammonia solution, with a biocatalyst through hydrolysis, a second step of separating the biocatalyst from the methionine-containing aqueous ammonia solution obtained in the first step, and a third step of distilling ammonia out of the methionine-containing aqueous ammonia solution separated in the second step to deposit and separate crystals of methionine.