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

E220: Sulfur Dioxide (Antioxidant & Wine Preservative) vs. E503: Ammonium Bicarbonate (Baker's Ammonia / Hartshorn)

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

Comparing:
E220: Sulfur Dioxide (Antioxidant & Wine Preservative)
E503: Ammonium Bicarbonate (Baker's Ammonia / Hartshorn)

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 →

E503 (Ammonium Bicarbonate / (NH4)HCO3) is a historic chemical leavening salt. INS 503(ii), ADI is Not Limited (Quantum Satis), decomposing 100% into gaseous CO2, ammonia, and water at temperatures >60°C to create ultra-crisp, airy crackers and cookies.

View full E503: Ammonium Bicarbonate (Baker's Ammonia / Hartshorn) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
E-Number Code
E220 E503
INS / Codex Number
INS 220 INS 503(ii)
Functional Class
Preservative, Antioxidant, Enzymatic Browning Inhibitor Raising Agent, Acidity Regulator
Acceptable Daily Intake (ADI)
0.7 mg / kg body weight per day (as SO2 equivalent) Not Limited (Quantum Satis)
Chemical Formula
SO2 (NH4)HCO3
Primary Mechanism
Molecular SO2 penetrates microbial membranes; bisulfite (HSO3-) cleaves disulfide bonds in enzymes and binds acetaldehyde Thermal decomposition leaves zero residual water or alkali salts: (NH4)HCO3 -> NH3(g) + CO2(g) + H2O(g)
Common Target Foods
Wines (Contains sulfites declaration >10mg/L), dried apricots, ciders, potato starch Thin crispy crackers, Italian biscotti, Greek koulourakia, sugar wafer shells
Dietary Compliance
Vegan, Halal, Kosher, Major Allergen Declaration Mandatory Vegan (Mineral synthesis), Halal, Kosher
Safety Approval
EFSA Authorized / FDA GRAS (21 CFR 182.3862 - Banned on raw produce) EFSA Authorized / FDA GRAS (21 CFR 184.1137)

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