Abstract
A two-step statistical experimental design was employed to optimize the medium for vitamin B 12 production from crude glycerol by Propionibacterium freudenreichii ssp. shermanii. In the first step, using Plackett–Burman design, five of 13 tested medium components (calcium pantothenate, NaH 2PO 4·2H 2O, casein hydrolysate, glycerol and FeSO 4·7H 2O) were identified as factors having significant influence on vitamin production. In the second step, a central composite design was used to optimize levels of medium components selected in the first step. Valid statistical models describing the influence of significant factors on vitamin B 12 production were established for each optimization phase. The optimized medium provided a 93% increase in final vitamin concentration compared to the original medium.
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