Chemical properties of the oil of five genotypes of Jatropha curcas L., in Colombia
Keywords:biofuel, cetane number, acidity, peroxide index, iodine index, calorific value, lipid profile
Introduction. Jatropha curcas L. (JC) is a multipurpose species with biological, pharmacological, and industrial applications. Its oil is recognized by the dominant composition of oleic-linoleic fatty acids that make it suitable as biofuel in internal combustion engines, without making major changes to the engine design. Objective. To identify in the oil of five JC genotypes in Colombia the cetane, peroxide, iodine, the acidity value, the calorific value indixes and to verify if they comply with standards for biodiesel production. Materials and methods. An experiment was carried out in Espinal, Colombia, in a randomized complete block design with five treatments and three repetitions. The treatments consisted of five JC genotypes. The fruit from the fifth harvest in 2015 was used. Five fatty acids (oleic, linoleic, linolenic, palmitic, and stearic) and five chemical properties (cetane index, acidity, peroxide, iodine, and calorific value) were determined from the oil. Results. The oil from the five JC genotypes evaluated in Colombia presented a lipid profile with a predominance of monounsaturated (oleic C18: 1) and polyunsaturated (linoleic C18: 2) fatty acids. The JC genotypes evaluated in Colombia presented a low cetane, peroxide, and iodine indexes, low acidity, and high calorific value. Conclusions. The properties of cetane and iodine indexes, of the genotypes evaluated complied with the specifications of the American Society for Testing and Materials (ASTM) and the European Norm for biofuel production, so they are classified as appropriate raw material for biofuel production.
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