Abstract
It was found that three new flavin compounds as FMN' or flavin cyclic 2', 5'-mononucleotide, flavinylglucoside mononucleotide of Rhizopus oryzae and flavin cyclic diphosphate of Aspergillus oryzae had no growth-promoting activity for Lactobacillus casei ATCC No. 7469,at the concentration ranged up to 4×10^<-8>M, but the significant growth responses of the acid hydrolysates of them were observed.
