FORMATION OF VITAMINS BY PURE CULTURES OF TEMPE MOLDS AND BACTERIA DURING THE TEMPE SOLID SUBSTRATE FERMENTATION

The formation of water soluble vitamins (vitamin B-12, vitamin B-6, riboflavin, thiamine, nicotinic acid and nicotinamide) during the tempe solid substrate fermentation was investigated. The role of several strains of Rhizopus oligosporus, R. arrhizus, and R. stolonifer and the role of several bacteria in the vitamin formation process were checked. All fungal and bacterial strains were isolated from Indonesian tempe and soaking water samples. The Rhizopus strains formed riboflavin, nicotinic acid, nicotinamide and vitamin B-6. The final concentrations of these substances depended on the different strains involved and on the fermentation time. Isolates of R. oligosporus were generally the best vitamin formers. The moulds did not produce physiologically active vitamin B-12. The thiamine content decreased during fermentation. The addition of bacteria, which had been selected in a screening for vitamin B-12 production, resulted in an increase of physiologically active vitamin B-12. Citrobacter freundii and Klebsiella pneumoniae showed the best formation capabilities. Furthermore, the bacteria produced riboflavin and vitamin Bg in addition to the moulds. The influence of Rhizopus on the vitamin B,, formation of Cit. freundii was also investigated. The vitamin content of tempe that was fermented with the mould and the bacterium was three times as high as a control fermentation with Cit. freundii only.