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Asian Journal of Biochemistry
Year: 2008  |  Volume: 3  |  Issue: 4  |  Page No.: 203 - 212

Comparative Study on Characteristics of Seed Oils and Nutritional Composition of Seeds from Different Varieties of Tobacco (Nicotiana tabacum L.) Cultivated in Bangladesh

M. Abbas Ali, M. Abu Sayeed, Rajesh Kumar Roy, Sarmina Yeasmin and Astaq Mohal Khan    

Abstract: The objectives of this study are to determine characteristics of seed oils and nutritional compositions of seeds from three varieties (Gidri, Virginia and Jati.) of tobacco. Present results revealed specific gravity (0.9235-0.9296), refractive index (1.4763-1.4815), pour point [-17-(-18), °C], flash point (135-142°C), fire point (154-162°C), cloud point [-15-(-18)°C], smoke point (215-230°C), cetane index (38.2-42.8), iodine value (134.37-138.20), saponification value (185.05-189.11), saponification equivalent (296.65-303.17), acid value (3.02-4.23), free fatty acid (1.51-2.12%), ester value (182.03-184.88), unsaponifiable matter (1.39-1.45%), peroxide value (1.77-2.56) and Reichert-Meissl value (0.38-0.45). No significant differences (p< 0.05) were observed among the varieties for refractive index, pour point, ester value, unsaponifiable matter and Reichert-Meissl value. High values (p< 0.05) for thermal properties flash point, fire point and smoke point were found in Gidri seed oil while Jati seed oil had highest cetane index. Iodine and peroxide values were low in Gidri seed oil compared to other varieties. Jati had the lowest in saponification and acid values. Glyceride classes were estimated to be monoglycerides (1.01-1.15%), diglycerides (3.75-6.39%) and triglycerides (88.65-91.39%) whereas lipid classes to be neutral lipid (83.10-85.02%), glycolipid (7.16-11.36%) and phospholipid (5.15-6.98%). No significant differences (p< 0.05) were observed among the varieties for triglyceride and neutral lipid contents. Saturated and unsaturated fatty acids present in the oils were separated and amounted to be (11.01-14.32%) and (82.73-86.75%), respectively, depending upon the varieties. GLC analysis showed the presence of significantly different (p< 0.05) percentage of fatty acids from series palmitic (C16:0) to arachidic (C20:0). Linoleic acid was the principal ranging from 67.40-72.10%. Among the varieties Jati seed oil was highest in unsaturated fatty acids. All varieties contained large amounts of lipid (42.29-45.72%), protein (19.21-21.05%), crude fiber (14.58-16.89%) and other essential nutrients. Except for the ash content, there were significant differences (p< 0.05) in the levels of all parameters among the sample tested. The knowledge of the present studies on different varieties of tobacco seeds could be important to its appropriate industrial use and for improvement in the nutritional value.

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