Potassium cinnamate can be added to all foods without being affected by PH(Pondus Hydrogenii). If adding to drinks, such as tea and carbonated, the original flavor will not be affect, but the product quality enhanced.
New food preservative potassium cinnamate is completely colorless and odorless. The oral LD50 of rats is 5.58-6.78g/kg, which is a non-toxic product. After absorption by the human body, it is converted into phenylalanine (phenylalanine is a kind of α-amino acids, and it's one of the essential amino acids of the human body) and is excreted by metabolism. A small amount of phenylalanine can be catalyzed into tyrosine(one of the 20 amino acids that make up a protein, is an essential amino acid in mammals) by phenylalanine hydroxylase , it has no toxic or side effects to the human body. Its effective antiseptic ingredient, cinnamic acid, was recognized by FEMA (Flavor Extract Manufacturers Association) in 1965 as GRAS (which is generally considered to be safe) potassium cinnamate natural cinnamon extract cinnamic acid potassium salt due to its dissolution Sexuality is widely used in foods, and its antiseptic mechanism is the conversion of potassium cinnamate to cinnamic acid under acidic conditions. Cinnamic acid is a weak acid with a pKa between 4.37 and 4.44, and its antimicrobial effect depends on the form of most of it being an unionized acid molecule. When dissolved in water, the weak acid does not completely ionize into ions, but forms a balance between charged, ionic and uncharged, unionized forms. The ratio of the two forms depends on the pH of the solution. The stronger the acidity of the solution is, the more unionized forms will be.
Since the year of 1950s, it has been known that the antimicrobial action of cinnamic acid is achieved by inhibiting the use of phenylalanine and tyrosine by microorganisms. In its unionized form, cinnamic acid is considered to be soluble in microbial membranes, enter cells, ionizes at higher pH and thus lowers internal pH, it affects the activity of many important enzymes effectively, and killing contaminated cells eventually.