SO2

What Is SO2 (Sulfur Dioxide)

SO2 is the chemical formula for sulfur dioxide, a colorless gas with a characteristic sharp odor that is used in the food industry as a preservative and antioxidant. Under the designation E220, it helps protect food against the growth of bacteria, molds and yeasts while also limiting unwanted browning and oxidation.

Pro-Ration emergency food pack

What Is the Function of SO2 in Food

Preservation

Sulfur dioxide slows down the growth of microorganisms and extends the shelf life of food.

Antioxidant Effect

It protects food from fat oxidation and discoloration, which is especially important for vegetables, potatoes or fruit.

Color and Flavor Stabilization

It helps maintain the natural appearance and taste of ingredients during storage.

Why SO2 May Appear in MRE Meals

In ready-made sterilized meals such as MRE (Meal Ready to Eat), SO2 may appear not as an added chemical but as a natural or secondary component of the raw ingredients used.

Secondary Ingredient Component

Sulfites are commonly found in certain raw materials such as dried fruit, potato products, spices or wine. The manufacturer does not intentionally add them to the recipe; they are already present in the supplied ingredients.

Mandatory Allergen Labeling

Sulfur dioxide and sulfites are classified as legally regulated allergens. If their concentration in the final product exceeds 10 mg/kg, they must be declared in the ingredients list – even if they were not added directly by the manufacturer.

Protection of Color and Texture

Residual sulfites in raw materials help prevent vegetables from turning gray or potatoes from darkening during drying and storage.

SO2 and Adventure Menu Meals

Adventure Menu produces ready-made meals from 100% natural ingredients without adding artificial preservatives. Long shelf life is achieved through sterilization (similar to canning) or vacuum drying, not chemical preservation. If SO2 is mentioned in some meals, it represents a naturally occurring residue from raw materials, not added chemicals. Ready-made meals from Adventure Menu and other MRE products are also available on our e-shop ANAREUS.cz.

Is SO2 Dangerous

For the majority of the population, sulfur dioxide in food is safe within permitted limits. Only individuals with severe allergies or asthma may be more sensitive, which is why SO2 must be declared on the label. In MRE and sterilized meals, it is present only in very low trace amounts that do not pose a health risk.

Summary

SO2 (sulfur dioxide) is a commonly used antioxidant and preservative. In high-quality MRE meals such as those from Adventure Menu, it appears only indirectly from raw ingredients and is not added as artificial chemicals. Thanks to modern processing technologies, these meals remain safe, long-lasting and fully suitable for consumption.