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In Vitro Evaluation of Photodynamic Activity of Plant Extracts from <i>Senna</i> Species against Microorganisms of Medical and Dental Interest

Background: Bacterial resistance requires new treatments for infections. In this context, antimicrobial photodynamic therapy (aPDT) is an effective and promising option. Objectives: Three plant extracts (<i>Senna splendida</i>, <i>Senna alata</i>, and <i>Senna macranthe...

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Main Authors: Analú Barros de Oliveira (Author), Túlio Morandin Ferrisse (Author), Sarah Raquel de Annunzio (Author), Maria Gleiziane Araújo Franca (Author), Maria Goretti de Vasconcelos Silva (Author), Alberto José Cavalheiro (Author), Carla Raquel Fontana (Author), Fernanda Lourenção Brighenti (Author)
Format: Book
Published: MDPI AG, 2023-01-01T00:00:00Z.
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Summary:Background: Bacterial resistance requires new treatments for infections. In this context, antimicrobial photodynamic therapy (aPDT) is an effective and promising option. Objectives: Three plant extracts (<i>Senna splendida</i>, <i>Senna alata</i>, and <i>Senna macranthera</i>) were evaluated as photosensitizers for aPDT. Methods: <i>Cutibacterium acnes</i> (ATCC 6919), <i>Streptococcus mutans</i> (ATCC 35668), <i>Staphylococcus aureus</i> (ATCC 25923), <i>Escherichia coli</i> (ATCC 25922), and <i>Candida albicans</i> (ATCC 90028) were evaluated. Reactive oxygen species production was also verified. Oral keratinocytes assessed cytotoxicity. LC-DAD-MS analysis identified the chemical components of the evaluated extracts. Results: Most species cultured in the planktonic phase showed total microbial reduction (>6 log10 CFU/mL/<i>p</i> < 0.0001) for all extracts. <i>C. albicans</i> cultured in biofilm showed total microbial reduction (7.68 log10 CFU/mL/<i>p</i> < 0.0001) for aPDT mediated by all extracts. Extracts from <i>S. macranthera</i> and <i>S. alata</i> produced the highest number of reactive oxygen species (<i>p</i> < 0.0001). The <i>S. alata</i> extract had the highest cell viability. The LC-DAD-MS analysis of active extracts showed one naphthopyrone and seven anthraquinones as potential candidates for photoactive compounds. Conclusion: This study showed that aPDT mediated by <i>Senna</i> spp. was efficient in microbial suspension and biofilm of microorganisms of medical and dental interest.
Item Description:10.3390/pharmaceutics15010181
1999-4923

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