Abstract
ABSTRACT J. Inst. Brew. 112(3), 232–236, 2006 In this study, the influence of the addition of a commercial wine yeast ( Saccharomyces cerevisiae ) at inocula of 1 × 10 4 to 1 × 10 7 cells/ml in Emir must was investigated with a focus on yeast growth, fermentation rate, ethyl alcohol and flavour compound formation. Spontaneous fermentation without inoculation was also performed. Higher peak counts were observed with higher amounts of S. cerevisiae yeast. Addition of various amounts of yeast led to the earlier disappearance of non- Saccharomyces yeasts. The fermentation rate was improved with higher amounts of yeast, but ethanol production was not affected. Concentrations of higher alcohols increased with increasing inoculum levels, especially inoculum sizes of 1 × 10 6 cells/ml and 1 × 10 7 cells/ ml. The amount of ethyl acetate was reduced with increased inoculum levels. Key words: cv. Emir, fermentation, inoculum level, Saccharo-myces cerevisiae, volatile compounds, wine. INTRODUCTION
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