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1H-NMR of sodium alginate (blue), Alg-Tyr (green), and Alg-Tyr-3APBA (red). 1H-NMR of tyramine and 3APBA is reported in SI. The functionalization of alginate was confirmed by the presence of protons of tyramine, which are visible in the range of δ = 6.8 to δ = 7.2 ppm, while peaks of 3APBA were identified in a range of δ = 7.3–7.7 ppm, partially overlapped with tyramine peaks.
