Research Article
Hydrogen Bond Acceptors and Additional Cationic Charges in Methylene Blue Derivatives: Photophysics and Antimicrobial Efficiency
Table 1
Characteristic values of methylene blue and its derivatives MB-1 to MB-6, where describes the maximum of the absorption; the dimerisation was detected in a concentration range between 10–200 μM; the photostability is described with the ratio of the height of the absorption maximum after irradiation to height of the maximum before irradiation with 180000 laser pulses; and are the rise and decay time of the time resolved singlet oxygen luminescence, respectively; is the quantum yield of singlet oxygen generation relatively to the quantum yield of methylene blue, which is found in literature to be 0.52 [43]; 1.00 is the quantum yield of MB set to 1.00, to simplify the comparison. For the values of the quantum yield an error of 10% in regard to the measurement procedure had to be estimated. “overlap” describes the uptake of the lamp emission spectrum by the different photosensitizers at a concentration of 10 μM. “Eff.Tox.” describes therefore the predicted effective toxicity that was calculated by multiplication of 1.00 (ref. MB) with the value of the overlap.
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