MONOMAGNESIUM PHOSPHATE
Prepared at the 69th JECFA (2008), published in FAO JECFA Monographs 5 (2008), based on the previously withdrawn tentative specifications prepared at the 61st JECFA and published in FNP 52, Add 11 (2003). A group MTDI of 70 mg/kg bw, expressed as phosphorus from all food sources, was established at the 26th JECFA (1982).
SYNONYMS Monomagnesium orthophosphate, Magnesium dihydrogen phosphate; Magnesium phosphate, monobasic; Magnesium biphosphate; Acid magnesium phosphate; INS No. 343(i)
DEFINITION Monomagnesium phosphate is manufactured by partial neutralization of phosphoric acid with magnesium oxide and drying of the resultant product.
Chemical names Monomagnesium dihydrogen phosphate
C.A.S. number 13092-66-5 (Anhydrous)
15609-87-7 (Dihydrate)
Chemical formula Mg (H2PO4)2. x H2O (x = 0 to 4)
Formula weight 218.3 (Anhydrous)
254.3 (Dihydrate)
290.3 (Tetrahydrate)
Assay Not less than 96% and not more than 102% as Mg2P2O7 on the ignited basis
DESCRIPTION White, odourless, crystalline powder
FUNCTIONAL USES Acidity regulator, nutrient
