Proteins of cottonseed (gossypium barbadense) .• extraction and characterization by electrophoresis
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The seed proteins of cotton (Gossypium barbadense) were quantitavely and qualitavely investigated. The qualitative study was carried out using different electrophoretic techniques ((PAGE, SDS-PAGE, Poro-PAGE, SDS-Poro-PAGE, 2-D SDS-PAGE, isoelectric focusing gels, and mapping gels). The quantities of the distilled water (albumin), salt (NaCl) (globulin), alcohol (prolamin) and alkaline solution (glu-telin) wer 126.4 +/- 1.51, 6.7.06 +/- 6.25, 30.78 +/- 4.2 and 79.40 +/- 3.1 mg/g dry meal respectively. Water soluble protein gave MW(s) of the reduced and unreduced buffer extracted proteins lies between 10 and 52 KD Second dimension gel showed that cottonseed proteins contain a disulphid bonded polypeptide with MW(s) 45 KD. Isoelectric points of the major polypeptides (the ploypeptides with MW(s) weights 52 KD and 48 KD) were between 9 and 9.5. The other polypeptides had pi-values between 5 and 7. Mapping gels, however indicated that the major bands were highly homogeneous with pi-values between 9-9.5.