Preservatives are natural or synthetic chemical ingredients used to be added to foods, medicines, pigments, biological specimens, etc. to delay spoilage caused by microbial growth or chemical changes. Nitrite and sulfur dioxide are among the commonly used preservatives. The main role of preservatives is to inhibit the growth and reproduction of microorganisms in order to extend the preservation time of food, inhibit the material corruption of the agent.

Food preservatives can inhibit microbial activity, prevent food spoilage, thereby extending the shelf life of food. Preservatives are food additives used to maintain the original quality and nutritional value of food for the purpose. There are 25 preservatives such as benzoic acid, sodium benzoate, sorbic acid, potassium sorbate, calcium propionate and so on. p>With the modern people on the health and healthy eating awareness of the increase, preservatives have become a drug in the food, the people in the supermarket to buy food has reached the "talk about preservatives" degree. In fact, preservatives are necessary additives in many foods, is to preserve the food essential ingredients, the normal dose of preservatives will not cause any harm to the human body.

Preservatives are scary, no preservatives are even more scary: safe use of the range of preservatives on the human body is non-toxic, and its side effects on the human body is not even comparable to sodium. China has approved 32 kinds of food preservatives can be used, like potassium sorbate, preservative is extremely strong, very little toxicity, the human body itself contains it, it can participate in the normal metabolism of the human body.

Baidu Encyclopedia - Preservatives