Lactose hydrolysis by mutant streptococcus thermophilus

摘要

Mutant strains of Streptococcus thermophilus having defective lactose transport systems having a phenotype gluS31, lacS-, sucS+ and beta gal+ are effective for use in processes where the hydrolysis of lactose is sought. Thermostability of these strains as well as the beta -galactosidase produced allows lactose hydrolysis prior to and during pasteurization. These organisms provide the food industry with improved methods of making reduced lactose dairy products.