Which gas is released during malolactic fermentation?

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Enhance your wine knowledge and tasting skills for the Sommelier Level 2 Exam. Engage with multiple choice questions, in-depth explanations, and practice flashcards. Prepare to excel in your sommelier certification!

Multiple Choice

Which gas is released during malolactic fermentation?

Explanation:
Malolactic fermentation occurs when lactic acid bacteria convert malic acid to lactic acid by removing one carboxyl group. That decarboxylation releases carbon dioxide as a byproduct, so carbon dioxide is the gas produced during this process. Oxygen isn’t generated in this anaerobic step, and hydrogen and nitrogen aren’t typical byproducts of malolactic fermentation in wine.

Malolactic fermentation occurs when lactic acid bacteria convert malic acid to lactic acid by removing one carboxyl group. That decarboxylation releases carbon dioxide as a byproduct, so carbon dioxide is the gas produced during this process. Oxygen isn’t generated in this anaerobic step, and hydrogen and nitrogen aren’t typical byproducts of malolactic fermentation in wine.

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