Determination of molecular weight and related hydrodynamic parameters of high molecular weight protein fraction from a few oilseeds.
The hydrodynamic parameters of the major protein fraction, viz. arachin from groundnut, alpha-globulin from sesame seed, brassin (M) from mustard seed and helianthinin from sunflower seed, have been determined in a single solvent system (0.05 M Tris-HCl buffer, pH 7.5 containing 0.5 M sodium chloride): sedimentation coefficient (s0(20,w)) and diffusion coefficient (D0(20,w)) by analytical ultracentrifugation, intrinsic viscosity [eta] by Ostwald viscometry and partial specific volume (V) by densimetry. The molecular weights (M) of the four proteins, calculated using the sedimentation-viscosity and sedimentation-diffusion coefficient methods, were found close to each other. The values have been compared with those in the literature and the reasons for discrepancies have been discussed.
Murty
B S
BS
Central Food Technological Research Institute, Mysore, India.
Prakash
V
V
Rao
M S
MS
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008970:Molecular Weight; D010940:Plant Proteins / Q000737:chemistry*; D012639:Seeds / Q000032:analysis
D010940:Plant Proteins