Viscosities of acacia and sodium alginate after sterilization by cobalt-60.
Acacia and sodium alginate powders were sterilized by cobalt-60 irradiation to a total dose of 2.5 Mrad with no increase in residual radioactivity of the gums as a result of the treatment. Viscosity measurements showed an 11% reduction in the viscosity of acacia in water and a 16% decrease in the intrinsic viscosity in barium chloride solution due to the irradiation. Viscosities of sodium alginate solutions in 0.1 N sodium chloride showed a 70% decrease in intrinsic viscosity, indicating changes in the molecular structure corresponding to degradation to 30% of the original degree of polymerization. This dose of gamma-radiation from cobalt-60 is not an appropriate method of sterilization for these gums.
D000045:Acacia; D000464:Alginates; D001464:Barium; D003037:Cobalt Radioisotopes; D008970:Molecular Weight; D012996:Solutions; D013242:Sterilization; D014783:Viscosity
D000464:Alginates; D003037:Cobalt Radioisotopes; D012996:Solutions; D001464:Barium