# item.guide
Side-by-Side Comparison Food Additives & E-Numbers

E220: Sulfur Dioxide (Antioxidant & Wine Preservative) vs. E224: Potassium Metabisulfite (Campden Salt)

Comparing 2 standards across 9 specifications. 8 key differences identified.

Comparing:
E220: Sulfur Dioxide (Antioxidant & Wine Preservative)
E224: Potassium Metabisulfite (Campden Salt)
E220: Sulfur Dioxide (Antioxidant & Wine Preservative) →

E220 (Sulfur Dioxide / SO2) is an inorganic gas dissolved in water to generate bisulfite and sulfite ions, providing potent antimicrobial and polyphenol oxidase enzyme-inhibiting properties. INS 220, group ADI is 0.7 mg/kg bw/day.

View full E220: Sulfur Dioxide (Antioxidant & Wine Preservative) spec sheet →
E224: Potassium Metabisulfite (Campden Salt) →

E224 (Potassium Metabisulfite / K2S2O5) is a white crystalline powder releasing 57.6% sulfur dioxide by weight when dissolved in acidic liquids. INS 224, ADI is 0.7 mg/kg bw/day, the premier sanitizing and stabilizing agent in commercial winemaking.

View full E224: Potassium Metabisulfite (Campden Salt) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
E220: Sulfur Dioxide (Antioxidant & Wine Preservative)
E224: Potassium Metabisulfite (Campden Salt)
E-Number Code
E220 E224
INS / Codex Number
INS 220 INS 224
Functional Class
Preservative, Antioxidant, Enzymatic Browning Inhibitor Preservative, Antioxidant, Sanitizer
Acceptable Daily Intake (ADI)
0.7 mg / kg body weight per day (as SO2 equivalent) 0.7 mg / kg body weight per day (as SO2 equivalent)
Chemical Formula
SO2 K2S2O5
Primary Mechanism
Molecular SO2 penetrates microbial membranes; bisulfite (HSO3-) cleaves disulfide bonds in enzymes and binds acetaldehyde Releases free SO2 and potassium ions, neutralizing wild yeasts and preventing enzymatic must oxidation
Common Target Foods
Wines (Contains sulfites declaration >10mg/L), dried apricots, ciders, potato starch Grape must, commercial wines, ciders, lemon juice concentrates, dried fruit processing
Dietary Compliance
Vegan, Halal, Kosher, Major Allergen Declaration Mandatory Vegan, Halal, Kosher (Allergen labeling required)
Safety Approval
EFSA Authorized / FDA GRAS (21 CFR 182.3862 - Banned on raw produce) EFSA Authorized / FDA GRAS (21 CFR 182.3637)

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