Derivative (finance) In finance, a derivative is a contract that derives its value from the performance of an underlying entity. This underlying entity can be an asset, index, or interest rate, and is often simply called the underlying.
Examples. Preservatives are either natural or chemical. Examples of chemical preservatives include nitrates, sulfites, sodium benzoate, potassium sorbate, and propyl gallate. Common natural preservatives include salt, lemon juice (citric acid), vinegar (acetic acid), sugar, and certain spices.unction. Preservatives work in one of three ways. They can prevent growth of microorganisms by creating an environment hostile to them. They can block the process of oxidation that causes foods to turn rancid.
When talking about preservatives in food, it might be easier to ask which foods donât contain preservatives than which foods do.Unless you slaughter your own meat, raise your own chickens and grow your own fruits and vegetables, nearly everything you eat contains some type of preservative.anned and Boxed Foods. Nearly every food that comes in a can, box or pouch contains some type of preservative. Since many processed foods sit on store shelves or in kitchen cabinets for months, adding preservatives keeps them from spoiling; spoiled, inedible food wastes money.