Food additives Europe numbers: E228
Potassium bisulfite, also known by its INS number 228 and E number E228, can be used as a food preservative, but its applications are becoming increasingly limited due to some potential health concerns and a consumer preference for minimally processed foods. Here's a breakdown of its properties and uses:
What is Potassium Bisulfite?
- Chemical compound: Potassium bisulfite is a white crystalline or liquid compound formed by reacting sulfur dioxide with potassium carbonate or hydroxide. Sulfur dioxide is a naturally occurring gas, but it's also used as a food additive.
Preservative Function:
- Antioxidant and antimicrobial effects: Potassium bisulfite acts as a preservative in several ways:
- It inhibits the growth of certain bacteria, yeasts, and molds that can cause spoilage.
- It prevents oxidation, a chemical reaction that can lead to discoloration, off-flavors, and nutrient loss in some foods, particularly those containing fats and vitamins.
Applications (with limitations):
- Dried fruits: Potassium bisulfite can help maintain the color and quality of dried fruits like raisins and apricots.
- Wines and processed fruits and vegetables: In some cases, it might be used in limited amounts to prevent browning or fermentation. However, its use in wine is becoming less common due to consumer preferences and regulations in some regions.
Safety Considerations:
- Potential health concerns: Some people with asthma or sulfite sensitivity may experience adverse reactions to potassium bisulfite consumption. Regulatory bodies have established limitations on its use to minimize potential risks.
- Alternatives: There's a growing trend towards using alternative preservation methods like modified atmosphere packaging or natural antioxidants to minimize the need for sulfites.
Regulations:
- Limited use: The use of potassium bisulfite in food is generally restricted to specific food categories and with limitations on maximum allowable levels set by regulatory bodies like the US FDA and the European Food Safety Authority (EFSA).
- Labeling requirements: Foods containing potassium bisulfite must declare it on the ingredient list, especially if it's used at levels exceeding a certain threshold.
Overall:
While potassium bisulfite can be a useful preservative for specific applications, its use is declining due to potential health concerns and a growing preference for minimally processed foods and alternative preservation methods. If you have concerns about sulfites, you can check food labels or contact manufacturers directly about the ingredients they use.