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. 2020 Oct 31;6(4):39. doi: 10.3390/gels6040039

Figure 4.

Figure 4

(A) Swelling ratios for dex-PDA hydrogels in deionized water with feed ratios ranging 2:1–2:0.2 (dextran hydrogel has no PDA present) and dex-PEI-PDA hydrogels with feed ratios ranging 2:1:1–2:1:0.2 (dex-PEI hydrogel has no PDA present). (B) The 2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) antioxidant assay of dex-PDA hydrogels with feed ratios ranging 2:1–2:0.2. Negative controls of dextran hydrogel without PDA and water were used. For a positive control antioxidants Trolox and ascorbic acid were used.