科研之友
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摘要
Rapid and accurate sensing of beta-galactosidase (beta-gal) activity is particularly critical for the early detection of many diseases and has become a topic of interest in recent years. However, most traditional probes for beta-gal sensing often suffer from the disadvantages of narrow dynamic range, low reaction efficiency and are only employed with either colorimetric or fluorescence sensing. Furthermore, beta-galactosidase sensing based assay for efficient detection and antibiotic resistance analysis of Escherichia coli (E.coli) is not available. Here, an enzyme-induced probe assay was reported for dual sensitive fluorescence and colorimetric measurement of beta-gal activity, and was further employed for detection of Escherichia coli and their antibiotic resistance analysis. The DCM-beta gal probe was virtually non-emissive in aqueous solution, while it could be activated by beta-gal to produce bright emission. Under optimized conditions, DCM-beta gal displayed high sensitivity, selectivity and rapid response to beta-gal with a low detection limit of 1.5 x 10(-3) U ml(-1). Importantly, this assay was successfully applied to sensitive detection of E. coli cells with a fast detection process within 5 h and a low detection concentration of 1 x 10(3) CFU ml(-1). Furthermore, the enzyme-activatable assay was also successfully applied for high throughput E. coli antibiotic resistance analysis. The DCM-beta gal strategy is applied for the first time on the detection of E. coli cells and their antibiotic resistance analysis. It is provided with the advantages of high selectively, a simple operation, low cost and rapid detection. The detection platform can also be extended to analyze the level of beta-gal in other types of cells or biological samples. Overall, the simple, effective and dual-readout assay holds promise for efficient sensing of beta-gal activity and provides a potential tool for E. coli detection and their antibiotic resistance analysis.
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单位广州中医药大学; 南方医科大学; 1; 南开大学
