Food Additives

Food preservative as a kind of  food additive, commonly used in our daily life.
So What Are Food Preservatives?
Corruption, suppression of pharmaceutical substances. Namely, to corruption and the substrate material for the metabolism of microorganisms inhibited the growth continued. It is important under different circumstances inhibit the role of the most vulnerable to corruption, in particular the role of inadequate sterilization in general still has a lasting effect. On the fiber and wood preservative used mineral oil, coal tar, tannin, on biological specimens with formaldehyde, mercuric chloride, toluene, butyl hydroxy benzoic acid, nitro-bran lipid hydrazone derivatives or resin incense. Use of preservatives in food is limited, so more by drying, salting and some other physical methods. Special preservatives are organic acids such as acetic acid, oleic acid resin for the composition vegetable oil, mustard oil and other special ingredients. For local organisms (such as the human body surface or digestive tract), can be used according to specific conditions of various preservatives (such as iodoform, salicylic acid benzyl ester, aniline dyes, or acridine pigments, etc.).
Food preservatives can inhibit microbial activity, to prevent food spoilage, thus extending shelf life of food. Most drinks and packaged foods like long-term preservation, often have to add a food preservative. What food preservatives on human health, whether the risks?