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.
The most common preservatives, such as sorbic acid, benzoic acid, calcium propionate, sodium nitrite and disodium EDTA, are used to kill bacteria and fungus that cause rot. Other preservatives, such as BHT, BHA and propyl gallate, prevent food from changing color when exposed to oxygen.reservatives and additives are listed, however, on the ingredients list of any packaged food. While some packages will specify which ingredients are preservatives, others will simply state the name of the chemical.