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.
Parabens are the most widely used preservatives in cosmetics and personal care products such as soap, moisturizers, shaving cream and underarm deodorant, according to the Food and Drug Administration. To get a bit science-y, parabens are esters (a compound formed from acid and alcohol) of p-hydroxybenzoic acid.