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- W2025052131 abstract "Alginates were irradiated as solids or in aqueous solution with Co60 gamma rays in the dose range of 20 to 500 kGy to investigate the effect of radiation on alginates. Degradation was observed both in the solid state and solution. The degradation in solution was remarkably greater than that in the solid. For example, the molecular weight of alginate in 1% (w/v) solution decreased from 6×10−5 for 0 kGy to 8×10−3 for 20 kGy irradiation while the equivalent degradation by solid irradiation required 500 kGy. Degradation G-values were 1.9 for solid and 55 for solution, respectively. The free radicals from irradiated water must be responsible for the degradation in solution. The degradation was also accompanied by a color change to deep brown for highly degraded alginate. Little color change was observed on irradiation in the presence of oxygen. UV spectra showed a distinct absorption peak at 265 nm for colored alginates, increasing with dose. The fact that discoloration of colored alginate was caused on exposure to ozone suggests a formation of double bond in the pyranose-ring." @default.
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- W2025052131 date "2000-09-01" @default.
- W2025052131 modified "2023-10-17" @default.
- W2025052131 title "Radiation-induced degradation of sodium alginate" @default.
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- W2025052131 doi "https://doi.org/10.1016/s0141-3910(00)00070-7" @default.
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