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• W2103179475 startingPage "2022" @default.
• W2103179475 abstract "Hydroxyl radicals (and 15% H-atoms) were generated radiolytically in N2O-containing aqueous solutions of protonated chitosan (Mw = 4.0 × 105 Da, degree of deacetylation 90.5%, pH ≈ 3). The rate constant of H-abstraction from chitosan by OH radicals is k = 6.4 × 108 dm3 mol−1 s−1, as measured by pulse radiolysis using thymine as competitor. With SCN− as competitor the apparent rate constant is found to be too high, because of a condensation of SCN− around the positively charged macromolecule. The radiation-chemical yields of chain scission are G = 3.4 × 10−7 mol J−1 in N2O-saturated and G = 2.1 × 10−7 mol J−1 in N2O–O2-saturated solutions. The kinetics have been followed by pulse radiolysis with conductometric detection. For each chain break, ≈3.1 counterions (ClO4−) are released, on average, from the condensation zone into the bulk solution. In N2O-saturated solution the kinetics of chain scission are independent of dose rate, although more than one first-order process contributes (overall: k ≈ 95 s−1 at pH 3.3). In the presence of dioxygen, the kinetics of chain scission depend on the dose rate, i.e. second-order processes play also a significant role." @default.
• W2103179475 created "2016-06-24" @default.
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• W2103179475 date "2000-01-01" @default.
• W2103179475 modified "2023-10-07" @default.
• W2103179475 title "OH-Radical-induced chain scission of chitosan in the absence and presence of dioxygen" @default.
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• W2103179475 doi "https://doi.org/10.1039/b003952g" @default.
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