Product: Disodium Dihydrogen Pyrophosphate (SAPP, Na₂H₂P₂O₇)

CAS No.: 7758-16-9

Hazard Class:Non-hazardous

UN No.:Non-regulated

Appearance:White crystalline powder

Description:Disodium dihydrogen pyrophosphate is produced through controlled thermal dehydration of sodium phosphate at 200-300°C, serving as a multi-functional food additive (E450i) with slow acid release properties. Its unique double-phosphate structure provides:

Leavening: Reacts with NaHCO₃ at 45-55°C (delayed action in baked goods)

Emulsification: Chelates metal ions in processed cheeses

pH Control: Maintains acidity (pH 4.0-4.5 in 1% solution)

Key Specifications

• Purity: ≥95% (FCC IX)

• Lead Content: ≤2ppm (FDA 21CFR182.6787)

• Loss on Drying: ≤0.5%

Applications

Bakery: Cake mixes, frozen doughs (0.5-1.5% flour weight)

Meat Products: Retards fat oxidation in sausages

Seafood: Prevents struvite crystals in canned crab