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Munir, Muhammad Tanveer; Maneewan, Nattar; Pichon, Julien; Gharbia, Mohammed; Oumarou-Mahamane, Ismael; Baude, Jessica; Thorin, Chantal; Lepelletier, Didier; Le Pape, Patrice; Eveillard, Matthieu; Irle, Mark; Pailhoriès, Hélène; Aviat, Florence; Belloncle, Christophe; Federighi, Michel; Dubreil, Laurence
Scientific reports, 08/2021, Letnik: 11, Številka: 1Journal Article
Abstract Methods to test the safety of wood material for hygienically sensitive places are indirect, destructive and limited to incomplete microbial recovery via swabbing, brushing and elution-based techniques. Therefore, we chose mCherry Staphylococcus aureus as a model bacterium for solid and porous surface contamination. Confocal spectral laser microscope (CSLM) was employed to characterize and use the autofluorescence of Sessile oak ( Quercus petraea ), Douglas fir ( Pseudotsuga menziesii ) and poplar ( Populus euramericana alba L.) wood discs cut into transversal (RT) and tangential (LT) planes. The red fluorescent area occupied by bacteria was differentiated from that of wood, which represented the bacterial quantification, survival and bio-distribution on surfaces from one hour to one week after inoculation. More bacteria were present near the surface on LT face wood as compared to RT and they persisted throughout the study period. Furthermore, this innovative methodology identified that S. aureus formed a dense biofilm on melamine but not on oak wood in similar inoculation and growth conditions. Conclusively, the endogenous fluorescence of materials and the model bacterium permitted direct quantification of surface contamination by using CSLM and it is a promising tool for hygienic safety evaluation.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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