Electroanalytical chemistry and sensorMolecular size effects on carboxyl acidity: Implications for humic substances
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2013, Journal of Colloid and Interface ScienceCitation Excerpt :Here, we selected trivalent cationic and anionic groups to modify the neutral dextran main chain. The pKa values of the four amino groups of tetramine are higher than pH 7.4, and those of the four carboxyl groups of tetracarboxylic acid are lower than pH 7.4 [26,27]. Thus, after modification of these ionic groups on the dextran main chain, both groups are expected to exist mainly as trivalent ions at pH 7.4.
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