Plant essential oils are natural and aromatic compounds that are found in small amounts in plants and have many interesting applications as flavors and fragrances in perfumery, cosmetics, pharmaceutical, food, agriculture, industry and etc. Essential oils can be produced by various techniques including conventional, novel and biotechnology methods. can be considered as a good alternative to conventional methods due to short extraction time, higher efficiency and quality, non-degradable compounds due to heat, no pollution and etc. Recently, due to the limitations and disadvantages of methods of extraction from intact plants, scientists have been trying to move their way to biotechnology methods and make a variety of plant aromatic compounds by microorganisms. In the biotechnology method, there is no any concern about factors such climate conditions, supply shortages, natural disasters, plant diseases and etc. and a product with very high efficiency and quality is obtained.
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