In this study, linoleic acid is obtained by hydrolysis of soybean oil in ethanol/KOH, separation and enrichment using the urea-fatty acid complex formation method for the fractionation of fatty acids. The process involves the formation at 60 ◦C of a homogeneous solution of free fatty acid and urea in 95% ethanol, followed by cooling the resultant urea complex slurry to -5 ◦C and separation by filtration. | JOURNAL OF SCIENCE OF HNUE Chemical and Biological Sci. 2013 Vol. 58 No. 9 pp. 20-27 This paper is available online at http PREPARATION AND ENRICHMENT OF LINOLEIC ACID FROM SOYBEAN OIL USING AS NATURAL RAW MATERIAL FOR SYNTHESIS OF SYNERGIST TO INSECTICIDES Hoang Than Hoai Thu and Dao Van Hoang National Key Laboratory for Petrochemical and Refinery Technology Vietnam Institute of Industrial Chemistry Abstract. Linoleic acid is an unsaturated 18-carbon fatty acid with relatively high content in vegetable oils including soybean oil. Linoleic acid and its derivatives have interesting and valuable biological activities including a synergistic effect as an insecticide component. For example control of the rice brown plant hopper control with the use of the insecticide imidacloprid has been found to be enhanced when linoleic acid derivatives are added to the insecticide. In this study linoleic acid is obtained by hydrolysis of soybean oil in ethanol KOH separation and enrichment using the urea-fatty acid complex formation method for the fractionation of fatty acids. The process involves the formation at 60 C of a homogeneous solution of free fatty acid and urea in 95 ethanol followed by cooling the resultant urea complex slurry to -5 C and separation by filtration. The linoleic acid content obtained is about and can be used as a synergistic component when added to the insecticide imidacloprid. Keywords Linoleic acid soybean oil synthesis imidacloprid. 1. Introduction Natural or synthetic substances are said to be synergistic when the addition of the substance increases the lethality and effectiveness of a currently available insecticide and this is particularly useful when the problem of resistance has arisen. These substances that have such synergistic properties are by themselves considered to be nontoxic. In this respect adding a synergist to a pesticide is an effective way to reduce environmental pollution. In recent years natural-based .
