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. 2019 Sep 13;12(18):2972. doi: 10.3390/ma12182972

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Fourier transform infrared spectroscopy (FTIR) spectra of the untreated polyurethane catheter (Sample 1) and P-2-CA-treated catheter with the formation of porphyrin (Sample 2).