·
Linear
Formula Na2H2P2O7
·
Molecular
Weight 221.94
Synonym: Disodium
dihydrogen pyrophosphate, Sodium diphosphate dibasic
Disodium pyrophosphate or sodium
acid pyrophosphate is an inorganic compound consisting of sodium cations and pyrophosphate anion. It is a white, water-soluble solid that serves
as a buffering and chelating agent, with many applications in the food
industry.
Detailed Description:
When crystallised from water, it forms a
hexahydrate, but it dehydrates above room temperature. Pyrophosphate is a polyvalent anion with a
high affinity for polyvalent cations, e.g. Ca2+.
2 NaH2PO4 →
Na2H2P2O7 + H2O
Food uses
Disodium pyrophosphate is a popular leavening agent found in baking powders. It combines with
sodium bicarbonate to release carbon dioxide:
Na2H2P2O7 +
NaHCO3 → Na3HP2O7 + CO2 +
H2O
It is available in a variety of grades that affect
the speed of its action. Because the resulting phosphate residue has an
off-taste, SAPP is usually used in very sweet cakes which mask the off-taste.[1]
Disodium pyrophosphate and other sodium and potassium polyphosphates are widely used in food processing; in the E numberscheme, they are
collectively designated as E450, with the disodium
form designated as E450(a). In the United States, it is classified as generally recognized
as safe (GRAS) for food use. In canned seafood, it is
used to maintain color and reduce purge[clarification needed]during retorting. Retorting achieves
microbial stability with heat.[2] It is an acid
source for reaction with baking soda to leaven baked goods.[3] In baking
powder, it is often labeled as food additive E450.[4] In cured meats, it speeds the
conversion of sodium nitrite to nitrite (NO2−)
by forming the nitrous acid (HONO)
intermediate,[clarification needed] and can improve water-holding capacity.
Disodium pyrophosphate is also found in frozen hash browns and
other potato products, where it is used to keep the color
of the potatoes from darkening.[3]
Other uses
In leather treatment, it
can be used to remove iron stains on
hides during processing. It can stabilize hydrogen peroxide solutions
against reduction. It can be used with sulfamic acid in some dairy applications
for cleaning, especially to remove soapstone. When added to scalding water, it
facilitates removal of hair and scurf in hog slaughter and feathers and scurf in
poultry slaughter. In petroleum production, it can be used as a dispersant in oil well
drilling muds. It is used in cat foods as a palatability additive. Disodium
pyrophosphate is used as a tartar control agent in toothpastes.
PRICES
$143.58/KG OR $65.26/IB
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