Sweeteners are food additives that impart sweetness to soft drinks. Sweeteners can be divided into nutritive sweeteners and non-nutritive sweeteners according to their nutritional value. According to its sweetness, it can be divided into low-sweetness sweeteners and high-sweetness sweeteners.

Food additives refer to chemically synthesized or natural substances added to food for the purpose of improving food quality, color, aroma, and taste, as well as for the needs of antisepsis and processing technology.

Potassium sorbate, also known as potassium 2,4-hexadienoate, is the potassium salt of sorbic acid, and its molecular formula is C6H7O2K. White to light yellow scale-like crystals, crystal particles or crystal powder, odorless or slightly odorous, easy to absorb moisture when exposed to air for a long time, oxidative decomposition and discoloration.

Calcium propionate is an acid-type food preservative. Under acidic conditions, it produces free propionic acid, which has antibacterial effect. Its antibacterial effect is affected by the pH value of the environment, and the inhibitory effect on mold is the best when the pH value is 5.0.