Sodium Acid Pyrophosphate
Disodium Pyrophosphate
- CAS
- 7758-16-9
- EC
- 231-835-0
- Food Code
- E450
- Sectors
- Food & Nutrition
Sodium Acid Pyrophosphate (CAS 7758-16-9) is a food-grade pyrophosphate derivative of phosphoric acid that appears as a white granular powder soluble in water, provides a delayed acidic reaction for leavening, and is used in baked goods, donut mixes and canned tuna. It is synthesized from phosphoric acid, meeting food-grade standards from industry phosphates and industry compound databases.
Typical Properties
| Molecular formula | H4O7P2.2Na |
|---|---|
| Molecular weight | 221.94 g/mol |
| Appearance | white powder |
| Form | white powder |
| Color | White to Off-White |
| Melting point | decomposes 220°C [MER06] |
| Density | (hexahydrate) 1.86 |
| Water solubility | Fully miscible in water. Insoluble in alcohol and ammonia. |
| pH | 3.5-4.5 (20°C, 0.1M in H2O, freshly prepared) |
| GHS signal word | Warning · Irritant / harmful |
| Grades available | Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Sodium Acid Pyrophosphate
Applications
Incorporated in donut mixes for volume control; in canned tuna for struvite prevention; in baked goods for moisture retention; in meat processing for binding; and in cleaning compounds for buffering.
Safety & Risks
Can cause digestive upset if overconsumed; corrosive dust to mucous membranes. Low systemic toxicity; use respirators in dusty environments; comply with ADI limits per EFSA evaluations.
Packaging
Bagged in 25 kg kraft paper with polyethylene seals for durability. Store in dry pyrophosphate areas with shelf labeling for quick retrieval.