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

E224: Potassium Metabisulfite (Campden Salt) vs. E330: Citric Acid (Universal Acidulant / Chelator)

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

Comparing:
E224: Potassium Metabisulfite (Campden Salt)
E330: Citric Acid (Universal Acidulant / Chelator)
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 →
E330: Citric Acid (Universal Acidulant / Chelator) →

E330 (Citric Acid) is a tricarboxylic organic acid produced by industrial fermentation of Aspergillus niger on carbohydrate substrates. INS 330, ADI is Not Limited (Quantum Satis), the single most widely used acidulant, flavor enhancer, and metal chelator on Earth.

View full E330: Citric Acid (Universal Acidulant / Chelator) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
E224: Potassium Metabisulfite (Campden Salt)
E330: Citric Acid (Universal Acidulant / Chelator)
E-Number Code
E224 E330
INS / Codex Number
INS 224 INS 330
Functional Class
Preservative, Antioxidant, Sanitizer Acidity Regulator, Acidulant, Sequestrant, Antioxidant Synergist
Acceptable Daily Intake (ADI)
0.7 mg / kg body weight per day (as SO2 equivalent) Not Limited (Quantum Satis)
Chemical Formula
K2S2O5 C6H8O7 (2-hydroxypropane-1,2,3-tricarboxylic acid)
Primary Mechanism
Releases free SO2 and potassium ions, neutralizing wild yeasts and preventing enzymatic must oxidation Delivers bright citrus sourness; chelates pro-oxidant metal ions (Fe/Cu); activates pectin gelation
Common Target Foods
Grape must, commercial wines, ciders, lemon juice concentrates, dried fruit processing Citrus beverages, candy/confectionery, jams, canned tomatoes, cheese curdling, soft drinks
Dietary Compliance
Vegan, Halal, Kosher (Allergen labeling required) 100% Vegan (Aspergillus fungal sugar fermentation), Halal, Kosher
Safety Approval
EFSA Authorized / FDA GRAS (21 CFR 182.3637) EFSA Authorized / FDA GRAS (21 CFR 184.1033)

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