反应详情

Liquid rich medium high in glucose content (10 ml PS-medium in 25 ml tube) was inoculated with the appropriate yeast strain and grown overnight at 30° C. 1-2 ml of this culture containing 107 cells was used to inoculate 50 ml fresh medium in a 250 ml conical flask. The culture was incubated at room temperature for 5 days with agitation (90 rpm.). Yeast cells were sedimented overnight at 4° C. and the supernatant discarded. 50 ml fresh medium was added to the cells and 2. generation fermentation performed as above. 25 ml supernatant from the fermentation was delivered for GC-headspace analysis (see below) to determine the content of esters and alcohols. The results are shown in Table 5.5. The yeast strains carrying inactive alcohol acetyltransferase genes produced a reduced amount of acetate esters such as ethyl acetate and isoamyl acetate in comparison to the MBP94-21 strain.

1. customwas inoculated with the appropriate yeast strain and grown overnight at 30° C
2. addition1-2 ml of this culture containing 107 cells
3. waitYeast cells were sedimented overnight at 4° C.
4. addition50 ml fresh medium was added to the cells and 2