Why should alum be added to food

Natural water often contains a lot of fine suspended solids (bacteria, algae, protozoa, sediment, clay and other insoluble substances), colloidal substances (such as humus colloids, etc.) and some soluble salts, gases, etc. When removing suspended solids, coagulants such as alum or aluminum sulfate are commonly used to aggregate these impurities to form larger particles and precipitate.

Alum [kal(SO4)2·12H2O] is a double salt of potassium sulfate and aluminum sulfate, and its coagulation is mainly produced by Al2(SO4)3. When alum is dissolved in water, Al2(SO4)3 is produced due to hydrolysis.

al2(so4)3＋6h2o=2al(oh)3＋3h2so4

Or. al3+＋3h2o=al(oh)3＋3h+

Aluminium sulphate also reacts with calcium bicarbonate contained in water to form aluminium hydroxide and calcium sulphate.

al2(so4)3＋3ca(hco3)2=3caso4＋2al(oh)3↓+6co2↑

Most of the impurities in natural water are negatively charged particles, while aluminium hydroxide particles are positively charged, so the positively charged aluminium hydroxide particles can neutralize the negative charge of colloidal impurities in the water, so these impurities will soon condense and sink together with the aluminium hydroxide flocculents.

Since K2SO4 in alum has no effect on purifying water, and K2SO4 is a raw material, aluminum sulfate is generally used as a coagulant for water purification. In addition to aluminum sulfate, the water purification coagulant used in industry also includes aluminum chloride, iron chloride, iron sulfate, etc.

Water purification with alum can only remove suspended impurities in the water, but most of the salts dissolved in the water cannot be removed.

Edible alum, also known as alum, is a refinement of alum stone, and its chemical name is potassium aluminum sulfate. Alum is not only used as a chemical raw material, but also for water purification. Alum has a sour and astringent taste, and has a strong astringent effect, and eggplant traditional Chinese medicine believes that alum has the effects of detoxification and insecticide, dampness and itching, hemostasis and diarrhea, heat and phlegm.

Alum is also a traditional food improver and leavening agent, often used as an additive in the production of fritters, vermicelli, rice noodles and other foods. However, because the chemical component of alum is potassium aluminum sulfate, which contains aluminum ions, excessive intake will affect the body's absorption of iron, calcium and other components, resulting in osteoporosis, anemia, and even the development of nerve cells.

Alum contains aluminum, so it is very toxic. Aluminum itself is easy to accumulate in the human body, for example, in the brain, kidneys, liver, spleen and other organs may accumulate, if in the brain to produce regression deposition, it is easy to cause Alzheimer's disease, memory loss, mental decline and other symptoms.

Alum, also known as alum, is a refinement of alum stone and wantonly, and its chemical name is potassium aluminum sulfate. Alum can not only be used to prepare aluminum salts, baking powders, paints, tanning materials, clarifiers, mordants, papermaking, waterproofing agents, etc., but also can be used for water purification. In addition, alum is also a traditional food improver and leavening agent, and is often used as an additive in the production of fritters, vermicelli, rice noodles and other foods.

Fritters are a common food on the breakfast table, but the fritters contain alum, which once confused people who love to eat fritters. So what is alum, and why can't you eat it when you add it to fritters?

Alum is a chemical, the main use is used in chemistry, the most well-known function of alum is water purification agent, used to precipitate impurities in water, purify water quality. In addition, alum is also a traditional food improver and leavening agent, which is often used as an additive for the production of food hail holes such as fritters, vermicelli, and rice noodles. Because the chemical composition of alum is aluminum sulfate potassium, which contains aluminum ions, excessive intake will affect the body's absorption of iron, calcium and other components, so the amount should be controlled.

Alum is a common chemical with the chemical formula kal(SO4)2·12H2O. It is a colorless or white crystalline solid oak that is acidic and hygroscopic. Alum is a compound composed of aluminum, potassium, sulfate ions, and crystalline water.

Alum has a variety of uses, including industrial, pre-medical splits, food and cosmetics, and other fields:Industrial uses: Alum is commonly used as a flocculant and clarifier in water and wastewater treatment processes.

It is able to adsorb and precipitate solid particles and impurities suspended in water, making the water clear and transparent. Medicinal uses: Alum is used as an astringent and hemostatic agent in the pharmaceutical field.

It has the effect of shrinking the first tissue, and can be used for inflammation and trauma. Food uses: Alum is used as a food additive, mainly used for dehydrated and cured foods, such as dehydrated vegetables, bread and confectionery.

Alum is potassium aluminum sulfate dodecahydrate and is an inorganic substance. The chemical formula is kal(SO4)2·12H2O, which is a double salt of potassium sulfate and aluminum sulfate containing crystalline water. Soluble in water, insoluble in ethanol.

Alum has a sour and astringent taste, and is cold; It can be used to prepare aluminum salt, baking powder, oil and paint, tanning material, clarifier, mordant, papermaking, waterproofing agent, etc., and is often used for water purification in life. <

Alum is potassium aluminum sulfate dodecahydrate and is an inorganic substance. The chemical formula is kal(SO4)2·12H2O, which is a double salt of potassium sulfate and aluminum sulfate containing crystalline water. Soluble in water, insoluble in ethanol.

The taste of alum evokes cherry envy, sour, cold; It can be used to prepare aluminum salts, swords, baking powder, paints, tanning materials, clarifiers, mordants, papermaking, waterproofing agents, etc., and is often used for water purification in life.