Sodium tripolyphosphate

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inorganic compound
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This entry is made by China Science and Technology Information Magazine Participate in editing and review Science Popularization China · Science Encyclopedia authentication.
Sodium tripolyphosphate is a kind of inorganic compound , chemical formula Na five P three O ten , an amorphous water-soluble linear polyphosphate, commonly used in food Moisture retaining agent , quality improver, pH regulator, metal Chelating agent [1]
Chinese name
Sodium tripolyphosphate [2]
Foreign name
Sodium tripolyphosphate(STPP)
Alias
Penta sodium tripolyphosphate Sodium triphosphate Pentasodium phosphate
chemical formula
Na five P three O ten [2]
molecular weight
three hundred and sixty-seven point eight six four [2]
CAS login number
7758-29-4 [2]
EINECS login number
231-838-7 [2]
Melting point
622 ℃ [2]
Water solubility
Easily soluble in water
Density
2.52 g/cm³
Appearance
White crystalline powder
Security description
S24/25;S26;S36
Hazard symbol
Xi [2]
Hazard description
R36/37/38

Physical and chemical properties

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melting point
622℃
density
2.52g/cm three
appearance
White crystalline powder
Solubility
Easily soluble in water, the aqueous solution is alkaline [2]
Sodium tripolyphosphate has two crystalline states: type I (high temperature) and type II (low temperature). The difference is that their bond lengths and bond angles are different, and their chemical properties are the same, but the thermal stability and hygroscopicity of type I are higher than that of type II.

application area

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Sodium tripolyphosphate has the functions of chelation, suspension, dispersion, gel dissolution, emulsification, pH buffer, etc. It can be used as the main auxiliary agent of synthetic detergent, industrial water softener, tanning pretanning agent, dyeing auxiliary, organic synthesis catalyst, pharmaceutical industrial dispersant, food additive, etc. In addition to export STPP, domestic STPP consumption is mainly concentrated in detergent industry, food, ceramics, etc.

Amount of food added

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See the following table for the scope of use and the maximum amount of use or residue specified in the Hygienic Standard for the Use of Food Additives (GB2760-2014):
Food classification number
Food name
Maximum usage
(g/kg)
remarks
one
Milk and dairy products
(01.01.01, 01.01.02 and 13.0 are excluded)
five
01.01.01 pasteurized milk and 01.01.02 pasteurized milk are excluded. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
01.03.01
Milk powder and cream powder
ten
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
01.05.01
Cream
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
01.06.04
Processed cheese
fourteen
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
two point zero two
Water oil fat emulsion products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
two point zero three
Fat emulsified products other than 02.02, including mixed and/or flavored fat emulsified products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
two point zero five
Other grease or grease products
(Only for fat powder)
twenty
Only fat powder. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
three
Frozen drinks
(except 03.04 edible ice)
five
03.04 Except edible ice. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
04.02.02.04
Canned vegetables
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
04.05.02.01
Cooked nuts and seeds
(Only for fried nuts and seeds)
two
Only fried nuts and seeds. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
five
Cocoa products, chocolate and chocolate products (including cocoa butter substitute chocolate and products) and candy
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.02.03
Rice noodles (including rice dumplings)
one
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
six point zero three
Wheat flour and its products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.03.01
wheatmeal
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.03.02.01
Wet dough products (such as noodles, dumpling skins, wonton skins, and roasted wheat skins)
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.03.02.04
Batter (such as batter for fish and poultry), wrapping powder, frying powder
five
It can be used alone or in combination. The maximum use amount is calculated by phosphate radical. The use amount can be increased according to the coating rate
06.04.01
Coarse grain meal
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.04.02.01
Canned coarse cereals
one point five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.04.02.02
Other miscellaneous grain products (only limited to frozen potato chips, frozen potato cakes, frozen potato mash, frozen sweet potato mash)
one point five
Only frozen chips, frozen potato cakes, frozen mashed potatoes, frozen sweet potato mash. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
06.05.01
Edible starch
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
six point zero six
Cereals ready to eat, including rolled oats (flakes)
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
six point zero seven
Convenient rice and flour products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
six point zero eight
Frozen rice and flour products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
six point zero nine
Cereals and starch desserts
(such as rice pudding, cassava pudding)
(Only for canned cereal desserts)
one
Only canned cereal desserts. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
seven
Baked food
fifteen
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
eight point zero two
Prefabricated meat products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
eight point zero three
Cooked meat products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
09.02.01
Frozen aquatic products
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
09.02.03
Frozen surimi products
(including fish balls, etc.)
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
nine point zero three
Prefabricated aquatic products (semi-finished products)
one
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
nine point zero five
Canned aquatic products
one
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
10.03.02
Thermosetting egg products
(such as yolk cheese, egg sausage)
five
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
eleven point zero five
Flavoring syrup
ten
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
twelve point one zero
Compound seasoning
twenty
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
12.10.01.03
Other solid compound seasonings
(Only for instant wet noodle seasoning bag)
eighty
Only for instant wet noodle seasoning bags. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
12.10.01.03
Other solid compound seasonings
twenty
Other solid compound seasonings except instant wet noodle seasoning bags. It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
thirteen point zero one
Infant formula
one
Only calcium hydrophosphate and sodium dihydrogen phosphate can be used alone or in combination, and the maximum use amount is calculated by phosphate radical
thirteen point zero two
Supplementary food for infants and young children
one
Only calcium hydrophosphate and sodium dihydrogen phosphate can be used alone or in combination, and the maximum use amount is calculated by phosphate radical
fourteen
Beverages (excluding 14.01 packaged drinking water)
five
14.01 Except for packaged drinking water. It can be used alone or in combination. The maximum use amount is calculated by phosphate radical. The use amount of solid drinks is increased according to the dilution ratio
sixteen point zero one
jelly
five
It can be used alone or in combination, and the maximum use amount is calculated by phosphate radical. If it is used for jelly powder, the use amount shall be increased according to the mixing multiple
sixteen point zero six
Puffed food
two
It can be used alone or in combination, and the maximum amount is calculated by phosphate radical
fifteen point zero two
Concocting wine
five
Phosphoric acid only. The maximum use is calculated by phosphate radical [Announcement of the National Health and Family Planning Commission on Approving β - galactosidase as a New Food Additive (No. 1 in 2015)].
nine point zero four
Cooked aquatic products (edible)
five
Only sodium pyrophosphate and sodium hexametaphosphate. It can be used alone or in combination, and the maximum use is calculated by phosphate radical [Announcement of the National Health and Family Planning Commission on Approving β - galactosidase as a New Food Additive (No. 1 in 2015)].
13.01.03
Infant formula for special medical purposes
one
Only calcium hydrogen phosphate, sodium dihydrogen phosphate, phosphoric acid can be used alone or in combination, ready to eat state, and the maximum use is calculated by phosphate radical.
Phosphoric acid is widely used in the food industry. The announcement (No. 2 in 2018) on the expansion of the scope of application of seven new enzyme preparations, namely fructosyltransferase (also known as β - fructosyltransferase) and food additives, monoglyceride fatty acid ester and diglycerol fatty acid ester
Sodium tripolyphosphate is used for curing the raw meat of ham. For every 100kg of meat, add 2.2kg of No. 3 mixed salt (91.65% refined salt, 8% granulated sugar, 0.35% sodium nitrite) and 85g of sodium tripolyphosphate. Mix them well and marinate them for 48~72h in a cold storage at 0~4 ℃. The effect is good. It is used in the production of canned broad beans to soften the bean skin. Many fruits and vegetables have tough skins. With the maturity of fruits and vegetables, the skins become more tough. Adding polyphosphate in the water for blanching or soaking of fruits and vegetables can complexe calcium, thus reducing the toughness of the skins. [1]

Related terms

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Safety terminology
S24/25:Avoid contact with skin and eyes.
Avoid skin and eye contact.
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
After eye contact, immediately flush with plenty of water and seek medical advice.
S36:Wear suitable protective clothing.
Wear appropriate protective clothing.
Risk terminology
R36/37/38:Irritating to eyes, respiratory system and skin.
Irritating to eyes, respiratory system and skin.

security information

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  • Customs code: 2835311000