Studies on Egyptian cottonseeds: fatty acid-composition and protein patterns.
Fourteen Egyptian cottonseed varieties were analysed to study some properties of their lipids and proteins. Lipid contents of the kernels ranged from 29.0 to 35.1%. The mean value of the iodine number was 110.9. The tested varieties showed little or no differences regarding to their fatty acid content. A slight higher proportion of linoleic acid was recorded for the triglycerides whereas the polar lipids components contained a lower amount of this fatty acids compared to that found in the total lipids. Protein contents in the examined varieties ranged from 32.3 to 37.9%. The amount of water-soluble protein ranged from 12.8 to 23.0% of the total protein. An almost complete recovery (94.5-100%) of the total protein was yielded when the extraction was performed with 0.02 N NaOH instead of water. The electrophoretic patterns of the water-soluble proteins gave only two bands, having a molecular weight between 14,000 and 25,000 dalton. A clear differentiation between the varieties was noticed when the alkaline soluble protein extracts were subjected to electrophoresis. Accordingly, the examined varieties were classified into five groups each of them having a similar spectrum.
Hamza
M A
MA
Department of Food Science and Technology, Faculty of Agriculture, Alexandria University, Egypt.
Abdel-Aal
M H
MH
Khalil
M M
MM
D004044:Dietary Proteins / Q000032:analysis*; D004534:Egypt; D004591:Electrophoresis, Polyacrylamide Gel; D005227:Fatty Acids / Q000032:analysis*; D003368:Gossypium / Q000032:analysis*; D008055:Lipids / Q000032:analysis; D012639:Seeds / Q000032:analysis*; D012967:Sodium Dodecyl Sulfate
D004044:Dietary Proteins; D005227:Fatty Acids; D008055:Lipids; D012967:Sodium Dodecyl Sulfate