For adding propylene glycol to milk, firstly, the breasts of dairy cows are generally sterilized during milking, and propylene glycol is added to the bactericide to dissolve; Secondly, the pipeline will be cleaned during the production of dairy products, and a large number of cleaning agents will be added to the pipeline, and propylene glycol will be added to the cleaning agent; Thirdly, in the production of products, propylene glycol will be added to dissolve the added flavors and pigments.
About propylene glycol:
There are two stable isomers of propylene glycol: 1, 2- propanediol and 1, 3- propanediol. Its basic characteristics are colorless, odorless and odorless, easy to burn, strong in water absorption, freely miscible with organic solvents such as water and ethanol, and low in propylene glycol toxicity. Widely used in plastics, clothing, synthetic resin, cosmetics, food and many other fields.
Above content reference: propylene glycol-Baidu Encyclopedia