Aluminium potassium sulfate
CAS No.:7784-24-9
ALK (SO4) 2 · 12H2O, 474.3 (water), 258.2 (water)
Synonyms: Potassium alum, burnt alum, alum, potassium alum
Physical and chemical properties
Colorless transparent crystal or white crystalline powder, tablets, and blocks, odorless, relative density 1.757, melting point 92.5 ℃, slightly sweet and astringent. It can be weathered into opaque form in the air and heated to above 200 ℃ to become white powdered burnt alum due to the loss of crystal water. It is soluble in water, and the solubility increases significantly with the increase in water temperature. It can be hydrolyzed in water to form aluminum hydroxide colloidal precipitation. It is slowly soluble in glycerol and almost insoluble in ethanol.
It is prepared from alunite after combustion, extraction, evaporation, and crystallization; Aluminum sulfate is formed by adding sulfuric acid to bauxite and then adding an appropriate amount of potassium sulfate.
Toxicological basis
① LD50: 5 ～ 10g / kg (cat, acute oral).
② ADI: not proposed (FAO / who, 1994).
③GRAS：FDA-21CFR 184.11129.
Application
Bulking agent and stabilizer
GB 2760-2014 stipulates that it can be used in the pickled aquatic products (only jellyfish) according to the production needs, and the residual amount of aluminum is ≤ 500 mg/kg (calculated by Al in ready-to-eat jellyfish); Batter (such as drag batter used for fish and poultry meat), wrapping powder, frying powder, fried flour products, bean products, shrimp flavored slices and baked food shall be used in an appropriate amount according to production needs, and the residual amount of aluminum shall be ≤ 100 mg/kg (dry sample, calculated as Al).
This product is often used in combination with sodium bicarbonate as the acidic substance in the compound fluffing agent. Adding too much to food will make it taste astringent. About 6G / kg in shrimp slices; About 0.1% can be added as a brittleness preserving agent in the processing of fruits and vegetables;
When processing Beijing cake, the dosage is 2% of the Hawthorn pulp, and it is dissolved in the thick syrup by heating, and then poured into the Hawthorn pulp while it is hot, mixed well, and condensed to form; When processing white sugar lotus root slices, dip the lotus root slices into the solution of this product to prevent oxidation browning. As a color protecting agent for pickles, the dosage is 0.2% ~ 2%. Used as a water purifying agent, about 0.01%; It can also be used in the pickling and dehydration of jellyfish.
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