Study On The Green Synthesis And Application Of Aphid Alarm Pheromone

Study on the Green Synthesis and Application of Aphid Alarm Pheromone Due to its characters of species diversity, massive amount, rapid reproduction and serious damage to crop, aphid is considered to be one of the most destructive agricultural pests, and thus has attracted more and more research interest. Traditionally the control of aphid mainly depends on chemical insecticides, which may cause pollution to the environment and resistance of pests. It has been proved that when threatened by its natural enemies or other disruption, the aphid excretes a kind of chemical, which we call the aphid alarm pheromone, mainly composed of (E)-β-Farnesene. The rest of its species could percept the approaching dangers and flee through it. (E)-β-Farnesene is the metabolic product of the aphid and has some significant advantages, such as high specificity, protection of its natural enemies and non-pollution to the environmental. The application of aphid alarm pheromone or its combination with insecticide will effectively reduce the use of and resistance to insecticide, which may also benefits the environment. The main problem lies in this field is how to obtain the easy-to-get and low-cost meanwhile the choosing of synthetic method should be based on Green Chemistry principles.Aphid alarm pheromone was synthesized by vacuum catalytic fluidized bed with 12 principles in Green Chemistry as guidance, nerolidol as starting material and Al2O3 as catalyst. In order to industrialize this technique, fluidized bed was employed. Compared with the fixed one, either metal or glass fluidized bed showed promising advantages in many aspects, such as reaction time, efficiency, content and yield of (E)-β-Farnesene. The design of the metal fluidized bed especially guarantees the industrialization of the facility.This investigation focused on the influences of temperature, pressure, time. The optimized conditions of synthesis of (E)-β-Farnesene are: for glass fluidized bed, material weight 90g, catalyst weight 70g, activation temperature 500℃, activation time 180min, the yield is 48.88%; for metal fluidized bed, material 100g, catalyst 70g, activation temperature 600℃, activation time 120min, the yield is 40.125%. Modification was made according to the disadvantages of the facilities.The aphid alarm pheromones were formulated to stable, isotropic, transparent or semitransparent microemulsion mixture of oil, water and surfactant proportionally. The microemulsion of (E)-β-Farnesene and biclin insecticides kill the aphid by above 93%, which reflects promising effects in pests control and cuts down the quantities of pesticides.