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• W2040252548 endingPage "2510" @default.
• W2040252548 startingPage "2501" @default.
• W2040252548 abstract "An important feature of microbial biofilms is the development of four-dimensional physical and chemical gradients in space and time. There is need for novel approaches to probe these so-called microenvironments to determine their effect on biofilm-specific processes. In this study, we describe the use of seminaphthorhodafluor-4F 5-(and-6) carboxylic acid (C-SNARF-4) for pH microenvironment analysis in Pseudomonas aeruginosa biofilms. C-SNARF-4 is a fluorescent ratiometric probe that allows pH quantification independent of probe concentration and/or laser intensity. By confocal scanning laser microscopy, C-SNARF-4 revealed pH heterogeneity throughout the biofilm in both the x,y and x,z planes, with values ranging from pH 5.6 (within the biofilm) to pH 7.0 (bulk fluid). pH values were typically remarkably different than those just a few micrometers away. Although this probe has been successfully used in a number of eukaryotic systems, problems have been reported which describe spectral emission changes as a result of macromolecular interactions with the fluorophore. To assess how the biofilm environment may influence fluorescent properties of the dye, fluorescence of C-SNARF-4 was quantified via spectrofluorometry while the probe was suspended in various concentrations of representative biofilm matrix components (i.e., proteins, polysaccharides, and bacterial cells) and growth medium. Surprisingly, our data demonstrate that few changes in emission spectra occur as a result of matrix interactions below pH 7. These studies suggest that C-SNARF-4 can be used as a reliable indicator of pH microenvironments, which may help elucidate their influence on the medical and geobiological roles of natural biofilms." @default.
• W2040252548 created "2016-06-24" @default.
• W2040252548 creator A5030320255 @default.
• W2040252548 creator A5060092452 @default.
• W2040252548 date "2005-05-01" @default.
• W2040252548 modified "2023-10-15" @default.
• W2040252548 title "Application of a pH-Sensitive Fluoroprobe (C-SNARF-4) for pH Microenvironment Analysis in <i>Pseudomonas aeruginosa</i> Biofilms" @default.
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• W2040252548 doi "https://doi.org/10.1128/aem.71.5.2501-2510.2005" @default.
• W2040252548 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1087576" @default.
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