3.5. The effect of banana on sluggish fermentation
The effect of banana additions on ethanol production in blueberry
wines after 20 days of fermentation is shown in Fig. 5. The
levels of ethanol in wines containing 2%, 4% and 6% of banana were
1.32e1.68 times higher than that of the control. Residual sugar in
musts was decreased and ethanol production was increased in
proportion to the amount of banana added. These data suggest that
the likelihood of stuck and sluggish fermentation in blueberry wine
could be improved by the addition of banana. Although the ethanol
concentrations increased in proportion to the amount of banana
added before fermentation, the slope decreased. Different amounts
of banana could be used as a nutritional supplement for yeast to
solve stuck and sluggish blueberry wine fermentation.
3.6. Influence of nutrients on ethyl carbamate (EC) production
EC contents of blueberry wines at 0, 4 and 38 days of fermentation
are shown in Table 2. EC was not detected in the initial musts
of blueberry. EC increased during alcohol fermentation, and EC
content in blueberry must after 38 days of fermentation was in the
44.2e61.7 mg/l range. It was significantly influenced by the nutrients
added before fermentation with the exception of yeast extract.
The wines supplemented with 4% and 6% banana contained 61.7 mg/
l and 60.8 mg/l of EC, respectively, which was higher than that with
DAP (51.1 mg/l). These results suggest that EC formation can be
increased by the supplements added before fermentation.
3.5. The effect of banana on sluggish fermentationThe effect of banana additions on ethanol production in blueberrywines after 20 days of fermentation is shown in Fig. 5. Thelevels of ethanol in wines containing 2%, 4% and 6% of banana were1.32e1.68 times higher than that of the control. Residual sugar inmusts was decreased and ethanol production was increased inproportion to the amount of banana added. These data suggest thatthe likelihood of stuck and sluggish fermentation in blueberry winecould be improved by the addition of banana. Although the ethanolconcentrations increased in proportion to the amount of bananaadded before fermentation, the slope decreased. Different amountsof banana could be used as a nutritional supplement for yeast tosolve stuck and sluggish blueberry wine fermentation.3.6. Influence of nutrients on ethyl carbamate (EC) productionEC contents of blueberry wines at 0, 4 and 38 days of fermentationare shown in Table 2. EC was not detected in the initial mustsof blueberry. EC increased during alcohol fermentation, and ECcontent in blueberry must after 38 days of fermentation was in the44.2e61.7 mg/l range. It was significantly influenced by the nutrientsadded before fermentation with the exception of yeast extract.The wines supplemented with 4% and 6% banana contained 61.7 mg/l and 60.8 mg/l of EC, respectively, which was higher than that withDAP (51.1 mg/l). These results suggest that EC formation can beincreased by the supplements added before fermentation.
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