Essential Oil University

Graduate to a higher understanding of essential oils.


Congratulations! You have the opportunity to graduate to a higher degree of understanding about essential oils. The purpose of the Essential Oil University website is to provide accurate information and education regarding the world of essential oils. EOU began as a testing organization founded by essential oil chemist Dr. Robert Pappas in 1998 as Applied Essential Oil Research. Dr. Pappas still continues to do analytical testing for the essential oil and fragrance industry today, specializing in GC/MS analysis and reporting the chemical breakdowns of literally hundreds of different essential oils, CO2s and absolutes. As a Ph.D. chemist, Dr. Pappas soon became recognized as a leading authority in the field and was trusted by a long list of clients especially in the essential oil, fragrance, and flavor industries. Today, EOU is a leading education reference site regarding the chemical breakdowns of essential oils, absolutes, CO2's and other aromatic materials. Dr. P has collected an enormous amount of analytical reference data for research and quality control education purposes, much of which we have compiled into the largest online chemical reference database for essential oils in the world.

What are Essential Oils?

Essential oils can play a role in your life through many applications. Essential oils are the volatile, aromatic oils obtained by steam or hydrodistillation of botanicals. Most essential oils are primarily composed of terpenes and their oxygenated derivatives. Different parts of the plants can be used to obtain essential oils, including the flowers, leaves, seeds, roots, stems, bark, wood, etc. Certain cold-pressed oils, such as the oils from various citrus peels, are also considered to be essential oils but these are not to be confused with cold-pressed fixed or carrier oils such as olive, grapeseed, coconut etc. which are non-volatile oils composed mainly of fatty acid triglycerides. Other aromatic, plant-derived oils, which technically aren’t essential oils because they are solvent extracted, include Absolutes (hexane followed by ethanol extraction), CO2’s (liquid carbon dioxide used as the solvent) and Phytols or Florosols (fluoro-hydrocarbon solvent). Be sure to visit to our database page for more education opportunities. Questions? Contact us.