Food Science CDE Practice Exam 2026 - Free Food Science Practice Questions and Study Guide

The pretreatment for dehydration that inhibits enzyme activity and can extend drying time due to water absorption is sulfiting. This process involves the application of sulfur dioxide or sulfites to the food, which serves to inhibit the enzymes responsible for browning and spoilage. By stopping enzymatic reactions, sulfiting helps preserve color, flavor, and nutritional quality during the drying process.

However, sulfiting can lead to an extension of drying time. When sulfites are applied, they can cause the food to absorb additional moisture. This interaction can create a situation where the initial moisture content is temporarily increased, potentially delaying the overall drying process. It's important to manage this aspect of sulfiting to optimize the drying time and ensure product quality.

Blanching and curing serve different purposes: blanching primarily involves briefly boiling the food to inactivate enzymes while also reducing microbial load, whereas curing typically refers to a preservation method involving salt and sometimes nitrates or nitrites. Sulfuring, often confused with sulfiting, specifically relates to the use of sulfur dioxide in gas form rather than in solution, which can have different effects on the food.