The Screening of Yeast Strains for the Fermentation of Greengage Wine
Greengage, a kind of fruit with rich nutrition and healthcare functions, is an ideal material for fruit wine-making. Except quality raw materials, the production of greengage wine is in need of quality yeast strains. In order to obtain the best yeast strains suitable for the fermenta-tion of greengage wine, in the experiments, 11 collected strains were used as the starting strains for fermentation test in modified YPD culture mediums, and alcohol yield was the major consideration for primary screening, other factors including fermenting power, total acids content, and residual sugar indexes should also be considered. The three test strains including RC212,PRLWVER and DV10 passed through primary screening due to their higher alcohol concentrations (4.78%vol, 6.03%vol, and 5.03%vol respectively), strong fermenting capacities (8.76 g/150 mL,12.78 g/150 mL,and 14.98 g/150 mL respectively), and their lower total acids content (3.93 g/L,3.54 g/L,and 4.69 g/L respectively) and lower total sugar content (5.69 g/L,1.65 g/L,and 3.09 g/L respectively). Then after secondary screening (strains fermented with greengage mash), yeast strain PRLWVER was finally selected as the best suitable strain for the fermentation of greengage wine (its total esters content was 5.64 g/L, its dry extract content was 23.91 g/L, its alcohol content was 12.75%vol, and its residual sugar content and total acids content were 2.62 g/L and 7.14 g/L respectively).
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万方数据
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