Enzyme

Enzyme meaning in winemaking

An enzyme is a protein catalyst that speeds up a biochemical reaction without being consumed. In winemaking, enzymes help break down grape cell walls, release juice and aroma precursors, clarify must, support fermentation chemistry, and shape texture.

Yeast is not an enzyme. Yeast are living single-celled fungi, mainly Saccharomyces cerevisiae in alcoholic fermentation. Yeast produce and use enzymes, including enzyme systems that convert grape sugars into ethanol and carbon dioxide, but the organism itself is not an enzyme.

Winemakers may rely on natural grape and yeast enzymes or add commercial enzyme preparations, such as pectinase, to improve juice yield, color extraction, clarification, filtration, or aroma expression. Enzyme activity depends on temperature, pH, alcohol level, sulfur dioxide, and contact time.