Abstract
The photodynamic effects of deuteroporphyrin (DT) on the growth and viability ofStaphylococcus aureus, Streptococcus faecalis, andBacillus cereus are described. By exposure to light and DT, the growth ofSta. aureus andStr. Faecalis strains was markedly inhibited, whereasB. cereus was undergoing lysis. Counting the viable bacteria during the DT treatment revealed that more than 99% of the initial bacterial population was killed within the first 30 min of treatment. The pH dependence of the photodynamic inhibitory effect shows that it is best obtained at pH 6.5. No temperature dependence in the range of 37°–44°C could be detected. The best photodynamic effect was achieved when the culture was in the mid-log phase. DT-treated bacteria, when grown in the dark or in the presence of horse serum albumin, were unaffected by the porphyrin action. Electron microscopic examinations ofSta. aureus andStr. faecalis showed the appearance of well-developed mesosomes within the cell cytoplasm.B. cereus preparations have not shown any mesosome formation but showed some lysed cells as well as some spores. None of the mentioned effects by DT and light could be observed on Gramnegative bacteria such asEscherchia coli orPseudomonas aeruginosa.
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Nitzan, Y., Shainberg, B. & Malik, Z. Photodynamic effects of deuteroporphyrin on Gram-positive bacteria. Current Microbiology 15, 251–258 (1987). https://doi.org/10.1007/BF01589376
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DOI: https://doi.org/10.1007/BF01589376