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• W2017174893 abstract "A widely used coumarin derivative is 7-hydroxy-4-methylcoumarin-beta-D-galactoside (4-methylumbelliferone-beta-D-galactoside; 4-MU-GAL). This galactoside is utilized as a substrate for the detection of the beta-galactosidase activity of coliform bacteria in water analysis. The intense fluorescence of coumarin-based molecules has enabled them to be incorporated into enzyme-based tests for the quantitative assay of indicator bacteria. The aim of this present study was to evaluate the potential of other coumarin derivatives, by synthesis of a selection of core coumarin molecules.Several coumarin derivatives were found to be more promising than 4-MU, with ethyl-7-hydroxycoumarin-3-carboxylate (EHC) giving a combination of greater fluorescence over a broad pH range and reduced growth inhibition with 12 representative coliform strains. On conversion to a beta-galactoside derivative, EHC-GAL generated a more rapid fluorescence than any other tested substrate.When tested in a broth assay format, based on most probable number (MPN), low numbers of coliforms were detected with EHC-GAL around 1 h earlier than with 4-MU-GAL.The present study suggests that EHC-GAL should be evaluated as a substrate for the detection of coliforms in water analysis, due to a combination of the following favourable features: (i) reduced toxicity; (ii) increased fluorescence; (iii) pH stability of fluorescence; and (iv) rapid detection." @default.
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• W2017174893 date "2001-12-01" @default.
• W2017174893 modified "2023-09-27" @default.
• W2017174893 title "Synthesis and evaluation of novel fluorogenic substrates for the detection of bacterial beta-galactosidase" @default.
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• W2017174893 doi "https://doi.org/10.1046/j.1365-2672.2001.01484.x" @default.
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