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.
Darby Says. Sulphur additives in wine. The most common preservatives used in wine are 220 sulphur dioxide (used as a gas) and 224 potassium metabisulphite auseda as a solution. Both have two effects.They reduce the possibility of spoilage of the wine by wild yeast and bacteria and they stop the wine from oxidising.arby Says. Sulphur additives in wine. The most common preservatives used in wine are 220 sulphur dioxide (used as a gas) and 224 potassium metabisulphite auseda as a solution. Both have two effects.