3.1. Effects of co-fermentations of glycerol and fructose on vitamin B12
production in soy-yogurt
The fermented soy-yogurt supplemented with glycerol and fructose
had significantly higher vitamin B12 contents (Table 1), which were
1.2–2.2 folds than the control. The production of vitamin B12 was
increasing from Ca. 83 ng/mL to Ca. 140 ng/mL with the increase of
glycerol supplementation. Glycerol had definitely positive effects on
vitamin B12 production. Nevertheless, vitamin B12 production was
decreasing with the increase of fructose. All fermented soy-yogurt
contained almost 10% analogs. The percent of analogs in vitamin B12
rose with an increasing addition of fructose. The supplementations
of glycerol and fructose had tiny effects on pH values, but they had a
positive effect on cell growth in soy-yogurt.