Abstract: Onion is one of the vegetable which is Chinese largest area of cultivation, and high yield. It is also the Edible plants for traditional medicines in Asian countries which contain a variety of physiological active ingredient. It is play an important part in health, prevention and treatment of chronic diseases. Sulfur compounds is one of the main physiological effective components, mainly in onion oil. However, fresh onions contain little onion oil, only about 0.05 percent of fresh weight. The onion which is by daily dietary intaken is hard to play a good physiological effect. it is necessary to take effective ways which are efficient to extraction onion oil (sulfur compounds).
This article is to be discussed at a factory for the production by decompressing distillation process to extract onion oil, in order to improve the yield and quality. The yield and quality are by studying the different conditions which are as follows: warmly immersed; vacuum distillation and extraction solvent The results are as follows:
Experiments show the best technical parameters: onion homogenate 30 ℃, warmly immersed 3 h, vacuum distillation of 5 ~ 8kPa, dichloromethane for solvent extraction. The onion oil which is obtained in this condition is of good quality and high yield.
