Propylene glycol
CAS No.:57-55-6
Synonym: 1,2-propanediol
Physical and chemical properties
Propylene glycol is colorless, clear and transparent viscous liquid, odorless, slightly spicy and sweet, similar to glycerol in appearance, hygroscopic and non corrosive to metals. It can be freely mixed with most organic solvents such as water and alcohol.
Propylene glycol is stable to light and heat and combustible. It can be dissolved in volatile oils, but cannot be mixed with oils and fats. The relative density is 1.035 ～ 1.039, the boiling point is 187.3 ℃, and the viscosity is 0.056pa · s (20 ℃). Propylene glycol reacts with fatty acid to produce propylene glycol fatty acid ester, which acts as emulsifier and is an excellent solvent for condiments and pigments. Propylene reacts with chlorine water to produce propylene chloride secondary alcohol, which is hydrolyzed with sodium carbonate solution; Or oxidized from propane to propylene oxide and hydrolyzed with hydrochloric acid.
Toxicological basis
① LD50: (mouse, acute oral) 22 ～ 23mg / kg (BW), (rat, acute oral) 21.0 ～ 33.5mg/kg (BW).
②ADI：0～25mg/kg（BW）（FAO/WHO，1994）.
③GRAS：FDA-21CFR 184.1666.
Quality standard
Quality standard: GB 29216-2012
Application
Stabilizer and coagulant, anti caking agent, defoamer, emulsifier, water retention agent, thickener
GB 2760-2014 stipulates that the maximum consumption of cakes is 3.0g/kg; The maximum usage of raw wet noodle products (such as noodles, dumpling skins, wonton skins and Shaomai skins) is 1.5g/kg.
The reference dosage in food processing is 5g / kg (used alone or in combination with other carrier stabilizers) for cheese and cream mixture. It can be used as an extraction solvent for vanilla beans, roasted coffee beans, natural spices, etc.
It can also be used as a moisturizer and softener for candy, bread and packaged meat. Adding this product to the processed noodles can increase the elasticity, prevent the noodles from drying and cracking, and increase the luster.
Adding this product to processed tofu can increase flavor, whiteness, swell fried tofu and increase luster. This product has antiseptic effect and can be used as antiseptic of canned food, jam, pickled products, ham, sausage, etc. It can be used as antifreeze liquid and has antifreeze effect on food.
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