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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 5    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 5,May 2012
Studies on the Lipids and Fatty acid compositions of mature grain of three different varieties of corn (Zea mays L.)
Full Text(PDF, )  PP.913-917  
Author(s)
M.M. Uddin, S.Yeasmin, M. R. Zaman, M.B. Noor, K.A. Bashar, Md. Slahuddin
KEYWORDS
Corn, pollination, lipids, fatty acids, kernel and mature grain.
ABSTRACT
Changes in lipid content and fatty acid compositions of mature grain of three different varieties of corn have been studied. The lipids were extracted from the mature grain by using a solvent mixture of chloroform, methanol and water (65:35:4) and fractionated into lipid classes by a combined technique of column and thin layer chromatography. In all three varieties the synthesis of lipids and fatty acid compositions were most active between 15 and 45 days after pollination. Triglycerides (TG) constituted 15-41 % of the total lipids at 15 days and increased to 70-90% at 90 days after pollination. The saturated fatty acids of the TG fraction of all varieties decreased with the maturity of the grain. But the unsaturated fatty acids specially oleic and linoleic acids were gradually increased with the maturity of grain and it attained the highest percentage after 90 days of pollination. The synthesis of polar lipids represented 44.7-70.9% and 4-15.4% at 15 and 90 days respectively. It is interesting to note that polar lipids decreased rapidly with the maturity of the grain after 45 days. The physico-chemical characteristics of the oil of three different varieties were observed. The iodine value (130.0) and the percentage of the unsaponifiable matter (1.15) of the Sadaf variety were found to be much more higher than those of other varieties. No significant changes of other characteristics among the varieties were observed.
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