The names of preservatives are: sodium nitrite, acetic acid, potassium sorbate, propylene glycol, citric acid.

1, sodium nitrite: is a common preservative, it can inhibit the growth of bacteria and mold, extend the shelf life of food. It can give meat a red color.

2, acetic acid: acetic acid is a common preservative, it can inhibit the growth of bacteria and mold, extend the shelf life of food. Acetic acid is widely used in bread, pastries, pickles and other foods.

3, potassium sorbate: a natural preservative, it can inhibit the growth of bacteria and molds, extend the shelf life of food, is widely used in beverages, fruit juices and other foods.

4, propylene glycol: propylene glycol is a commonly used preservative, it can inhibit the growth of bacteria and mold, extend the shelf life of food. Propylene glycol is widely used in bread, pastry, meat products and other foods.

5, citric acid: citric acid is a natural preservative, it can inhibit the growth of bacteria and mold, extend the shelf life of food. Citric acid is widely used in beverages, fruit juice, canned food and other foods.

Refer to Baidu Encyclopedia - Sodium Nitrite Baidu Encyclopedia - Acetic Acid for the above