Microbial Fermentation Additives used as nutrients supplements like water-soluble vegetable protein and water-soluble nutrie Microbial Fermentation Additives derived from the process of steeping maize grains. A viscous concentrate of corn solubles, rich in vitamins, amino acids, minerals and other growth stimulants. Used in microbial fermentation, such as antibiotics (penicillin, erythromycin, ...