Issue 7, 2015

Bacterial imaging and photodynamic inactivation using zinc(ii)-dipicolylamine BODIPY conjugates

Abstract

Targeted imaging and antimicrobial photodynamic inactivation (PDI) are emerging methods for detecting and eradicating pathogenic microorganisms. This study describes two structurally related optical probes that are conjugates of a zinc(II)-dipicolylamine targeting unit and a BODIPY chromophore. One probe is a microbial targeted fluorescent imaging agent, mSeek, and the other is an oxygen photosensitizing analogue, mDestroy. The conjugates exhibited high fluorescence quantum yield and singlet oxygen production, respectively. Fluorescence imaging and detection studies examined four bacterial strains: E. coli, S. aureus, K. pneumonia, and B. thuringiensis vegetative cells and purified spores. The fluorescent probe, mSeek, is not phototoxic and enabled detection of all tested bacteria at concentrations of ∼100 CFU mL−1 for B. thuringiensis spores, ∼1000 CFU mL−1 for S. aureus and ∼10 000 CFU mL−1 for E. coli. The photosensitizer analogue, mDestroy, inactivated 99–99.99% of bacterial samples and selectively killed bacterial cells in the presence of mammalian cells. However, mDestroy was ineffective against B. thuringiensis spores. Together, the results demonstrate a new two-probe strategy to optimize PDI of bacterial infection/contamination.

Graphical abstract: Bacterial imaging and photodynamic inactivation using zinc(ii)-dipicolylamine BODIPY conjugates

Supplementary files

Article information

Article type
Paper
Submitted
10 Mar 2015
Accepted
03 Jun 2015
First published
03 Jun 2015

Photochem. Photobiol. Sci., 2015,14, 1271-1281

Author version available

Bacterial imaging and photodynamic inactivation using zinc(II)-dipicolylamine BODIPY conjugates

D. R. Rice, H. Gan and B. D. Smith, Photochem. Photobiol. Sci., 2015, 14, 1271 DOI: 10.1039/C5PP00100E

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