On the basis of special fermentation needs of Amino acid,DF103 defoamer was concentrate on studies by our company as a new-style polyether fermentation defoamer. DF103 defoamer is qualified for long inhibiting foam performance in polyether fermentation defoamer field.DF103 has high security superiority to microbial strain through specific polymerization technics, Meanwhile, It has the benefit of saving the usage amount .DF103 defoamer is used in the process of microbe fermentation of glumatic acid, citric acid, lysine, leucine, arg arginene, dicarboxylic acid, terramycin, aureomycin, neomycin, avermectin, colomycin, spinosyn, vitamin c, vitamin B2, Coenzyme Q10,erythritol,yeast and so on