Selective
discrimination and lasting tracking of live bacteria
are primary steps for microbiology research and treatment of bacterial
infection. However, conventional detection methods, such as the gold
standard of Gram staining, are being challenged under actual test
conditions. Herein, we provided a novel method, namely, three excitation
peaks and single-color emission carbon quantum dots (T-SCQDs) for
the rapid (5 min) peptidoglycan-targeting discrimination of Gram-positive
bacteria and lasting tracking (24 h) through one-step staining. Bacterial
viability testing indicates that T-SCQDs can achieve nondestructive
identification of Gram-positive bacteria within 50–500 μg
mL–1. Interestingly, the fluorescence imaging system
suggests that T-SCQDs can also selectively distinguish the type of
colonies based on fluorescence intensity. Furthermore, T-SCQDs were
successfully used to visually distinguish Gram-positive bacteria from
the microbial environment of A549 cells by confocal fluorescence microscopy.
These properties endow T-SCQDs with excellent functions for the diagnosis
of infection and other biological applications.
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