High-concentration alcoholic fermentation method
A technology of alcohol fermentation and high concentration, applied in the field of bioengineering, can solve the problem of high cost of accelerators, achieve good economic benefits, simplify procedures, and achieve high alcohol concentration
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Embodiment 1
[0029] Example 1: Saccharomyces cerevisiae SY-1 screened by our laboratory was used as the strain for fermentation. The strain was preserved in China Center for Type Culture Collection on October 23, 2006, with the preservation number CCTCC M 206111.
[0030] (1) The total sugar in the fermentation medium is 305g L -1 , and the remaining ingredients are (g L -1 ): yeast powder 5, peptone 5, (NH 4 )2 SO 4 1.5, KH 2 PO 4 1.5, MgSO 4 .7H 2 O 0.6, CaCl 2 3.0, pH6.0~6.5. The amount of accelerator added is (mg L -1 ): V B1 10,V B6 30, niacin 30, p-aminobenzoic acid 5. Sterilize at 0.08MPa for 15 minutes. Into sterile air, dissolved oxygen 90%. Inoculation, 30°C, 200r / min shaking table shaking fermentation. During the fermentation, feed was fed twice, and the time was 8h and 24h respectively. The fermentation time is 54h. The final ethanol concentration was 18.12% (20°C, V / V, the same below), the fermentation efficiency was 91.73%, and the residual sugar was 0.25% (g / 1...
Embodiment 2
[0036] Example 2: Fermentation with Saccharomyces cerevisiae as the strain, and the fermentation volume is 1 L.
[0037] (1) Activate the dry yeast and inoculate it in the medium for fermentation. The total sugar in the fermentation medium is 295gL -1 , all the other ingredients are with embodiment 1 (1). Into sterile air, dissolved oxygen 65%. During the fermentation, feed was fed three times, and the time was 8h, 15h, and 24h respectively. Fermentation time 60h. The final ethanol concentration was 17.47%, the residual sugar was 0.39%, and the fermentation efficiency was 91.44%.
[0038] (2) The sugar clear liquid obtained after cassava starch liquefaction and saccharification is used as carbon source. Total sugar is 275g L -1 , fermentation condition is the same as embodiment 1 (6), ferments to 54h and ends. The final ethanol concentration was 16.15%, the fermentation efficiency was 90.68%, the residual reducing sugar was 0.45%, and the residual total sugar was 0.89%....
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