Essential Oils Defined.. The International Organization for Standardization (ISO) in their Vocabulary of Natural Materials (ISO/D1S9235.2) defines an essential oil as a product made by distillation with either water or steam or by mechanical processing of citrus rinds or by dry distillation of natural materials.
Presentation of case: Essential oils and their volatile constituents have been. and to two chemically well-defined chemotypes of T. schimperi essential oil was .
picture of the biological activities of lavender essential oil. Copyright Â© 2002 John. . analysis of the flower 'aroma', defined as the analysis of the head space .
Essential oils or volatile oils are the most important group of chemical. the plant the ability to build unique essential oils each with their biological activity and .