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University of Khartoum (2017)

Physicochemical Properties of Neem Seeds Oil

Mohmed, Marwa Mahmoud Ibraheem

Titre : Physicochemical Properties of Neem Seeds Oil

Auteur : Mohmed, Marwa Mahmoud Ibraheem

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) 2017

Résumé
The study aims to investigate the physicochemical characteristics of Neemseeds oil of plant Azadirachtaindicia, grown in different geographical areasin Sudan. The seeds oil was extracted through Soxhlet method via hexane for the duration of 6 h. Neem seed kernels contain about 25-45% of oil. The result obtained showed that the percentage of Neem seeds oil in the seed was 38.87 %. The characteristics of the oil shows that, the physical state is liquid ; color is brownish yellow ; odor is garlic ; refractive index is 70.90 ; pH is 4 and boiling point is 158 0C. Complete data for density as a function of temperature have been measured at temperature from 30 0C to 150 0C as well as three fatty acids (palmitic– streaic and oleic) at temperatures from300Cto 150 0C ;the density of fatty acid were determined by (modified Rackett equation). A linear correlation was fitted to the experimental data. The present mean deviations were less than 0.07% for all data. Data for viscosity as a function of temperature from 35 0C to 50°C have been measured also, the viscosity measurements was performed according to American Society for Testing and Materials (ASTM) standard test method D445.A cubic correlations were fitted to the experimental data ,the error was less than 0.01%. In order to determine the functional groups present in the neem oil, Fourier Transform Infrared spectroscopy was used(FTIR-8400 Spectrometer, SHIMADZU),and to determine the transmittance and absorption values for neem oil UV- Spectrophotometer was used . Gas Chromatography Spectrometer was performed for the fatty acid profile ; GC recorded eight similar fatty acids : oleic (0.0779%), linoleic (0.0137%), stearic (1.9361%), palmitic(0.8203%), arachidic(0.0148%), behenic(0.0118%), lignoceric(0.1378%). Myristic(0.4567%) and lauric acid (0.1558%). No significant differences observed in transmittance. The overall study proves that, the plant geographical variation influences the quality of the oil.

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Page publiée le 4 décembre 2018