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Comparative Study on Characteristics of Seed Oils and Nutritional Composition of Seeds from Different Varieties of Tobacco (Nicotiana tabacum L.) Cultivated in Bangladesh |
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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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How to cite this article:
M. Abbas Ali, M. Abu Sayeed, Rajesh Kumar Roy, Sarmina Yeasmin and Astaq Mohal Khan, 2008. Comparative Study on Characteristics of Seed Oils and Nutritional Composition of Seeds from Different Varieties of Tobacco (Nicotiana tabacum L.) Cultivated in Bangladesh. Asian Journal of Biochemistry, 3: 203-212.
DOI: 10.3923/ajb.2008.203.212
URL: https://scialert.net/abstract/?doi=ajb.2008.203.212
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