Why is blanching necessary before freezing, even though freezing does not completely stop enzyme action?

Why is blanching necessary before freezing, even though freezing does not completely stop enzyme action?

• A. Freezing does not completely stop enzyme action
• B. Blanching makes the product sterile
• C. Blanching adds moisture
• D. Blanching speeds drying

Answer: (A)

Blanching is used before freezing to inactivate enzymes that would degrade quality during storage. Freezing slows enzyme reactions but doesn’t stop them completely, so enzymes can still cause browning, off-flavors, or textural changes, especially during thawing or long-term storage. By briefly heating the product, blanching denatures these enzymes, helping preserve color, flavor, and texture in the frozen state. It’s not a sterilization step, and its main purpose isn’t to add moisture or speed drying, but to inactivate enzymes that would otherwise continue to act even at freezing temperatures.

Blanching is used before freezing to inactivate enzymes that would degrade quality during storage. Freezing slows enzyme reactions but doesn’t stop them completely, so enzymes can still cause browning, off-flavors, or textural changes, especially during thawing or long-term storage. By briefly heating the product, blanching denatures these enzymes, helping preserve color, flavor, and texture in the frozen state. It’s not a sterilization step, and its main purpose isn’t to add moisture or speed drying, but to inactivate enzymes that would otherwise continue to act even at freezing temperatures.