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Yeasts

• Yeasts are single-celled fungi.
  
  
• Saccharomyces cerevisiae (sugar loving yeasts) are the predominant genus of yeasts involved in winemaking.
  
  
• Yeasts convert sugar to alcohol and carbon dioxide (CO₂) during fermentation.
  
  
• Yeast that produce undesirable compounds are considered spoilage yeasts.
  
  
• In the production of Flor sherry, surface yeasts are utilised to convert alcohol to acetaldehyde and other aldehydes as part of the styles flavour complexity.