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Vitamin B12 production by P. freudenreichii strains 256, 263, and 266 in barley flour matrix (BF) and aleurone matrix (AM) without or with cobalt chloride (Co), riboflavin (RF), and nicotinamide (NAM) or 5,6‐dimethylbenzimidazole (DMBI) supplementation. The results were obtained by UHPLC and MBA and are given as averages of three biological replicate fermentations, with error bars representing the standard deviations
