MAGNESIUM DIHYDROGEN DIPHOSPHATE
New specifications prepared at the 76th JECFA (2012) and published in FAO JECFA Monographs 13 (2012). No ADI was established. A group MTDI of 70 mg/kg bw, expressed as phosphorus from all food sources, was established at the 26th JECFA (1982).
SYNONYMS Acid magnesium pyrophosphate, monomagnesium dihydrogen pyrophosphate; magnesium diphosphate, INS No. 450 (ix)
DEFINITION Magnesium dihydrogen diphosphate is the acidic magnesium salt of diphosphoric acid. It is manufactured by adding an aqueous dispersion of magnesium hydroxide slowly to phosphoric acid, until a molar ratio about 1:2 between Mg and P is reached. The temperature
is held under 60o during the reaction. About 0.1% hydrogen peroxide is added to the reaction mixture and the slurry is then dried and milled.
Chemical names
C.A.S. numberMonomagnesium dihydrogen diphosphate 20768-12-1
Chemical formula MgH2P2O7
Formula weight 200.25
Assay Not less than 68.0% and not more than 70.5% expressed as P2O5 Not less than 18.0% and not more than 20.5% expressed as MgO
DESCRIPTION White crystals or powder
FUNCTIONAL USES Acidifier, stabilizer, raising agent
