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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/).
The photostability of porphyrins: TPP, ClTPP, Cl2TPP, TPPS, Cl2TPPS, and TMPyP in PBS solution (DMSO content < 1%) with an absorbance ca. 1. Irradiation of the porphyrin solution was carried out using a 420 nm LED with various light doses.