公开(公告)号：BR9300930A

公开(公告)日：1993-10-13

申请号：BR9300930

申请日：1993-04-07

Applicant: KAO CORP

Inventor： HAYASHI MASAHARU ,  HIOKI YUICHI ,  SHONAKA MASAFUMI ,  MORIYAMA TADASHI

IPC: B01D19/04 ,  C07C67/26 ,  C12M1/21 ,  C12N1/20 ,  C12N1/38 ,  C12P13/04

Abstract: Disclosed herein are antifoaming agents for fermentation which include, as active ingredient at least one of (a) a reaction product obtained by adding at least one alkylene oxide to a mixture of a fat and/or oil with a trihydric or still higher polyhydric alcohol, or (b) a compound represented by the following general formula (1): (1) wherein n stands for a number of 2-50, R1, R2 and R3 mean individually a hydrogen atom or an acyl group having 2-31 carbon atoms, x denotes an alkylene group having 2-4 carbon atoms, and m1, m2 and m3 are individually a number of 0-200, an L-amino acid-producing medium containing either one of these components, and a production process for L-amino acids making use of this medium. The use of this antifoaming agent permits the quick, sure and durable suppression of bubbling during incubation, and the overall production of the L-amino acid is significantly improved.