ABSTRACT
Essential oils (EOs) are liquid and aromatic extracts comprised of volatile and non-volatile chemicals that are obtained from aromatic plants by various conventional and advanced extraction methods. There are various extraction procedures available. The type of extraction method used for extraction determines the biological and physicochemical properties of the finished liquid product. Due to the presence of diverse chemical compounds, mainly mixtures of volatile compounds, EOs offer a wide range of biological properties. This chapter summarizes numerous research findings on the chemical composition of EOs and methods of oil extraction, along with applications of these oils in pharmaceutical fields.
