Why might sulfite be added during the drying of vegetables?

During the dehydration of vegetables, sulfite is added for several functional purposes:

• Antimicrobial Agent: It acts as an antimicrobial agent to help preserve the product.1
• Heat Transfer: It aids in the efficiency of heat transfer during the drying process.1
• Blanching: In the specific case of potatoes, it functions as a blanching agent.1
• Enzyme Inhibition: Sulfites help prevent quality degradation by inactivating enzymes that cause enzymatic browning, which occurs when vegetables are cut or bruised.2

While sulfites are effective, it is important to note that a small percentage of the population is allergic to them. Consequently, the food industry is actively seeking economically feasible alternatives to replace their use in vegetable processing.1