potassium metabisulfite
Basic Information
| Field | Content |
|---|---|
| Chinese name | potassium metabisulfite |
| English name | potassium metabisulfite |
| INS/E number | INS 224 |
| Functional class | Preservative, Antioxidant |
| Year adopted | 1965 |
| Approved by | Australia/New Zealand (FSANZ), European Union (EFSA) |
What is it?
Potassium metabisulfite is the dehydrated dimer of potassium bisulfite; it releases sulfur dioxide in solution and is used as a preservative and antioxidant.
Source
Industrial：二氧化硫与碳酸钾反应后脱水结晶制得
Why is it used?
- Inhibits microbial growth
- Prevents oxidative browning and discolouration
- Used in winemaking as antioxidant and antimicrobial
- Maintains colour of dried fruits
Common Foods
- Wine
- Dried fruits
- Candied fruits
- Pickled vegetables
- Jams
Safety
ADI (Acceptable Daily Intake)：0-0.7 mg/kg bw (以 SO₂ 计)
Concerns：
- 哮喘及敏感者可能过敏
- 破坏硫胺素（维生素B1）
Usage Standard
China：GB 2760《食品安全国家标准 食品添加剂使用标准》
International：
- EU Regulation 1333/2008 Annex II/III (E 224)
- FDA 21 CFR 182.3637 (Potassium metabisulfite, GRAS)
- Codex GSFA (INS 224)
- Australia New Zealand Food Standards Code (Potassium metabisulfite)
In a nutshell
Potassium metabisulfite is a potassium sulfite preservative commonly used to protect colour and freshness in wine and dried fruits.
Consumer Advice
Potassium metabisulfite is a sulphite preservative and antioxidant used mainly in winemaking to control spoilage microbes and oxidation, as well as in dried fruit and beer, acting like sodium metabisulfite. It releases sulfur dioxide in food. It is safe for most people, but sulphites are a required-labelling allergen, so asthmatics and sensitive individuals should avoid products containing them. Compliant products use it within legal limits and label it accordingly.
Dietary Restrictions
- Vegan: ✅
- Halal: ✅
- Kosher: ✅
Allergens
⚠️ Contains allergens
Disclaimer
The information provided here is for discussion and educational purposes only. It is not medical advice or an evaluation/rating of any product or ingredient. This information may not apply to you; before using or taking any action, you should contact the manufacturer, vendor, medical, dietary, fitness, or other professionals. If you use any information provided here, you do so at your own risk.