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- W2063588894 abstract "Abstract The time course of the depolymerization of pullulan, carboxymethylcellulose. welan, scleroglucan and scleroglucan ionic derivatives (“sclerox”) in dilute aqueous solution of hydroxyl free radicals (∗OH) has been monitored by means of viscosity measurements at 20 °C. Two ∗OH sources have been employed, namely; Cu(II)/ascorbate and N-hydroxy-2-thiopyridone. Singly dispersed polysaccharidic chains undergo depolymerization at a relatively high rate which appears to depend only scarcely on chain structure and charge density, for the experimental conditions employed. Conversely, chains in double-stranded form (welan) or in triple-stranded form (scleroglucan) exibit viscosity decreases which are very small (welan) or undetectable (scleroglucan) whithin the first 1-2 hours of measurements. However, single strands scissions due to ∗OH attack become manifest when welan and scleroglucan solutions undergo thermal cycles following which their viscosity irreversibly decreases by as much as 70% with respect to that of the initial states." @default.
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- W2063588894 date "1997-05-01" @default.
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- W2063588894 title "Polysaccharides Depolymerization<i>Via</i>Hydroxyl Radicals Attack in Dilute Aqueous Solution<sup>1</sup>" @default.
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- W2063588894 doi "https://doi.org/10.1080/07328309708007335" @default.
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