Preservatives are essential in inhibiting the growth of microorganisms that thrive on spoilage substances. They play a crucial role in preventing spoilage effects, particularly when general sterilization methods fall short. Various preservatives are used for different situations, catering to specific needs. For instance, mineral oil, coal tar, tannin, and formaldehyde are employed as preservatives for fiber, wood, and biological specimens. However, the use of preservatives in food is limited, and alternative methods like drying and pickling are employed. Some special preservatives include organic acids like acetic acid, vegetable oils containing oleic acid, and unique components like mustard seeds and essential oils. When it comes to organisms on the skin or digestive tract, specific conditions determine the choice of preservatives such as iodoform, phenyl salicylate, aniline dyes, or acridine pigments. The selection of preservatives depends on the circumstances at hand to ensure effective preservation.
In China, food safety is of utmost importance, particularly when it comes to food preservatives. In order to ensure consumers' safety, China has only approved 32 permitted food preservatives, all of which have undergone extensive scientific testing to ensure that they are low-toxicity and safer for human consumption. These preservatives have been subjected to various tests, including animal feeding and toxicological tests and identification, and have been found to be harmless to the human body. As long as food manufacturers use these preservatives within the limits specified by the national standards, they will not pose any risk to human health. For instance, potassium sorbate and sodium benzoate are commonly used preservatives in the food industry. These two preservatives are generally eliminated from the body through urine and do not accumulate in the human body. Therefore, consumers can be confident about the safety of the foods they purchase in the market.