| 摘要 |
The invention relates to the use of DL-methionyl-DL-methionine and salts thereof as a feed additive in feed mixtures for animals held in aquacultures, and a method for producing DL-methionyl-DL-methionine (I) having the formula (I) by converting a urea derivative of the general formula (II) to DL-methionyl-DL-methionine, wherein the groups R1 and R2 in the urea derivatives IIa, IIb, IIc, IId, IIe, IIf, and IIg are defined as follows: IIa: R1 = COOH, R2 = NHCONH2 IIb: R1 = CONH2, R2 = NHCON-H2 IIc: R1 = CONH2, R2 = NH2 IId: R1 -R2 =-CONH-CONH-IIe: R1=CN,R2 =OH IIf:R1=CN,R2=NH2 IIg: R1= =O, R2 = H. |
