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. 2021 Jan 1;11(1):397–409. doi: 10.7150/thno.50741

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Modification of 3D-printed PCL scaffolds. (A) 3D-printed PCL scaffolds exhibited a highly intercommunicating porous morphology by SEM observation (Left image for the top view and Right image for the side view). (B) XPS analysis verified that the amino group (-NH₂) was successfully coated onto the surface of 3D-printed PCL scaffold. (C) The amino groups between PCL and PCL-NH2 scaffolds were comparably analyzed by ninhydrin coloration. (D) The graft efficiency of the anchor peptide CP05 was obviously higher in PCL NH₂⁺ than that in PCL NH₂^-. The CP05 was conjugated with Alexa Fluor 488 to present green fluorescence.