Side-by-Side Comparison
Food Additives & E-Numbers
E224: Potassium Metabisulfite (Campden Salt) vs. E338: Phosphoric Acid (Cola Acidulant)
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
E224: Potassium Metabisulfite (Campden Salt)
E338: Phosphoric Acid (Cola Acidulant)
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.
E338 (Phosphoric Acid / H3PO4) is a mineral inorganic acid providing a uniquely dry, tangy, astringent sourness. INS 338, group ADI is 40 mg/kg bw/day (as phosphorus), the quintessential acidulant in cola beverages and processed cheeses.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
E-Number Code
|
E224 | E338 |
|
INS / Codex Number
|
INS 224 | INS 338 |
|
Functional Class
|
Preservative, Antioxidant, Sanitizer | Acidulant, Acidity Regulator, Sequestrant, Emulsifying Salt |
|
Acceptable Daily Intake (ADI)
|
0.7 mg / kg body weight per day (as SO2 equivalent) | 40 mg / kg body weight per day (Group ADI as phosphorus) |
|
Chemical Formula
|
K2S2O5 | H3PO4 (pKa1 2.15) |
|
Primary Mechanism
|
Releases free SO2 and potassium ions, neutralizing wild yeasts and preventing enzymatic must oxidation | Lowers beverage pH to ~2.5 with a clean, sharp, non-fruity tang; retards bacterial outgrowth |
|
Common Target Foods
|
Grape must, commercial wines, ciders, lemon juice concentrates, dried fruit processing | Cola soft drinks, root beers, processed cheese melts, sports hydration drinks |
|
Dietary Compliance
|
Vegan, Halal, Kosher (Allergen labeling required) | Vegan (Mineral phosphate synthesis), Halal, Kosher |
|
Safety Approval
|
EFSA Authorized / FDA GRAS (21 CFR 182.3637) | EFSA Authorized / FDA GRAS (21 CFR 182.1073) |
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