Monosodium phosphate (MSP) is a food-grade phosphate salt used as an acidity regulator, sequestrant, stabilizer, and texturizer across multiple food categories. It plays a key role in meat processing, cheese manufacturing, dairy products, and desserts.
For kosher food production, monosodium phosphate is a straightforward additive to certify. Its inorganic origin and mineral-based manufacturing process align well with kosher dietary principles, and certified versions are readily available from established suppliers.
Kosher and Halal Certification of MSP
Monosodium phosphate manufacturers like Reephos hold ISO 22000, FSSC 22000, ISO 9001, BRC, Kosher, and Halal certifications for their food-grade MSP. These layered certifications reflect the clean production chain typical of inorganic phosphate salts.
The compound is synthesized from sodium hydroxide and phosphoric acid, both mineral-derived. No animal-based materials are involved in production, which gives MSP a Pareve classification under kosher law. Over two-thirds of recognized food additive functions can be performed by both kosher and non-kosher substances, making third-party certification important even for seemingly straightforward ingredients.
Technical Profile of Food-Grade MSP
Monosodium phosphate monobasic exists in anhydrous form or with one to two molecules of water of hydration. The anhydrous form appears as a white, crystalline powder or granules, while hydrated forms present as white or transparent crystals. All forms are freely soluble in water but insoluble in alcohol.
A 1:100 aqueous solution of MSP produces a pH between 4.1 and 4.7, making it useful as an acidulant. The CAS number is 7558-80-7, and the molecular weight of the anhydrous form is 119.98 g/mol. Bulk density is a minimum of 0.60 g/cc, and moisture content at 110 degrees Celsius should not exceed 1.5%.
Food Processing Applications
In meat processing, MSP functions as a texturizer that improves water retention and firmness in cured and processed products. It helps maintain consistent texture across production batches while extending shelf stability.
Processed cheese manufacturing uses MSP as a stabilizer and emulsifying aid, preventing fat separation and maintaining smooth melt characteristics. In dairy desserts, it serves as a buffering agent that controls pH during heat treatment. MSP also finds application in shrimp feed processing, where it contributes both phosphorus nutrition and pH control.
Storage and Handling Considerations
MSP anhydrous is slightly hygroscopic, meaning it absorbs moisture from the air and carries a risk of caking during storage. It should be kept in closed containers in a cool, dry warehouse at temperatures between 0 and 25 degrees Celsius. Store separately in compliance with food-grade regulations to prevent contamination.
Standard commercial packaging is 25 kg paper bags with polyethylene liners, though custom packaging may be available by request.
Kosher Monosodium Phosphate Supplier
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