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. 2011 Apr 26;16(5):3488–3498. doi: 10.3390/molecules16053488

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© 2011 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 license (http://creativecommons.org/licenses/by/3.0/).

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DNA photocleavage activity of porphyrin 4 (lanes 2-5) and porphyrin 7 (lanes 6-9) as a function of its concentration. Lane 1: DNA (Form I) control; lane 2, 6: 5 μM; lane 3, 7: 10 μM; lane 4, 8: 20 μM; lane 5, 9: 40 μM for porphyrin 4 and 7. Photo-irradiation conditions: λ_irrad = 455 nm; duration, 60 min.