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(a) Non-functionalized alginate (3% w/v), (b) functionalized alginate (2% w/v) after 8 h of reaction, (c) functionalized alginate (2% w/v) after 24 h of reaction. The functionalization is confirmed by the presence of new peaks in the spectra at 5.63 ppm and 6.09 ppm attributed to the methylene group and a peak at 1.82 ppm that corresponds to the methyl group.
