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. Author manuscript; available in PMC: 2018 Nov 28.
Published in final edited form as: J Control Release. 2017 Oct 4;266:321–330. doi: 10.1016/j.jconrel.2017.10.002

Figure 2. Characterizations of heparin-immobilized PCL (PCL–HT) substrate prepared by tyrosinase-catalyzed reaction.

Figure 2

Surface density of heparin: (a) PCL–HT substrates with different tyrosinase-reaction times (1–12 h), and (b) bare PCL, PCL/HT (without tyrosinase treatment) and PCL–HT (with tyrosinase treatment) for 3 h. (c) Surface wettability and water contract angles before and after HT functionalization. XPS analysis: (d) wide scan and (e) narrow scan spectra for S2p/N1s in bare PCL and PCL–HT surfaces. Results in (a) (c) are shown as the average values ± S.D. (n = 3).