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. 2016 Aug 9;6:31036. doi: 10.1038/srep31036

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(A) DS versus reaction time obtained from TNBS assay. DS rapidly increased within 1–5 min, with saturation after 1 h. (B) ¹H NMR verification. Peaks correspond to acrylic protons (2H) of methacrylamide grafts of lysine groups (a) and those of hydroxyl lysine groups (b), methylene protons (2H) of unreacted lysine groups (c), and methyl protons (3H) of methacrylamide grafts (d).