Influence of the NaCl or CaCl2 concentration on the structure of heat-set bovine serum albumin gels at pH 7.
The structure of heat-set systems of the globular protein bovine serum albumin (BSA) was investigated at pH 7 in different salt conditions (NaCl or CaCl(2)) using light scattering. Cross-correlation dynamic light scattering was used to correct for multiple scattering from turbid samples. After heat treatment, aggregates are formed whose size increases as the protein concentration increases. Beyond a critical concentration that decreases with increasing salt concentration, gels are formed. The heterogeneity and the reduced turbidity of the gels were found to increase with increasing salt concentration and to decrease with increasing protein concentration. The structure of the gels is determined by the strength of the repulsive electrostatic interactions between the aggregated proteins. The results obtained in NaCl are similar to those reported in previous studies for other globular proteins. CaCl(2) was found to be much more efficient in reducing electrostatic interactions than NaCl at the same ionic strength.
Donato
Laurence
L
Unité de Physicochimie des Macromolécules, INRA, Rue de la Géraudière, BP 71642, 44316 Nantes Cedex 03, France.
Garnier
Catherine
C
Doublier
Jean-Louis
JL
Nicolai
Taco
T
D002122:Calcium Chloride / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008027:Light; D018613:Microscopy, Confocal; D009391:Nephelometry and Turbidimetry; D011487:Protein Conformation; D012542:Scattering, Radiation; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*; D055672:Static Electricity
D012710:Serum Albumin, Bovine; D012965:Sodium Chloride; D002122:Calcium Chloride