Functionalized Magnetic Nanoparticles with BODIPYs for Bioimaging and Antimicrobial Therapy Applications
32
Citation
44
Reference
10
Related Paper
Citation Trend
Abstract:
The antimicrobial capability and recyclability of two conjugates that combines the versatility of iron oxide magnetic nanoparticles (MNPs) with the high photosensitizing proficiency of boron-dipyrromethene (BODIPY) dyes are assessed. By a relatively simple synthetic pathway, two conjugates were obtained. The first one, MNP-B1, contains a highly fluorescent dye for bioimaging and suitable inactivating properties. The other one, MNP-B2, is optimized to improve the production of cytotoxic reactive oxygen species (ROS) by incorporating heavy atoms in the BODIPY core. In vitro experiments in bacterial cell suspensions and at the single bacterium level reveal that both conjugates can inactivate either Gram-positive (methicillin-resistant Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria. By means of fluorescence microscopy, not only cellular uptake of the conjugates but also recyclability and sustained performance over the cycles of photodynamic inactivation (PDI) are demonstrated. This is the first time that MNPs functionalized with BODIPY dyes are utilized to obtain fluorescent images of bacterial cells and photoinactivate pathogens.Keywords:
BODIPY
Conjugate
Iron oxide nanoparticles
The synthesis of new B-O BODIPY derivatives functionalized with different alkoxy or diarylalkoxy derivatives is described. These compounds were synthesized from the reaction of different B-F BODIPY precursors with various alcohols and phenols, in the presence of AlCl3. Water-soluble dyes could be synthesized as well with this method, specifically by the introduction of polyethyleneglycol (PEG) groups. A photophysical study of the different compounds was performed, and showed that the B-O BODIPY derivatives exhibit rich fluorescence properties. Finally, the conjugation of the BODIPY core has been extended using two distyryl groups, hence providing NIR emitting BODIPY derivatives, in which one or two PEG groups have been anchored, making these systems very promising for future medical imaging applications.
BODIPY
Surface Modification
Cite
Citations (48)
Covalent functionalization of graphene oxide (GO) with boron dipyrromethenes (BODIPYs) was achieved through a facile synthesis, affording two different GO-BODIPY conjugates where the main difference lies in the nature of the spacer and the type of bonds between the two components. The use of a long but flexible spacer afforded strong electronic GO-BODIPY interactions in the ground state. This drastically altered the light absorption of the BODIPY structure and impeded its selective excitation. In contrast, the utilisation of a short, but rigid spacer based on boronic esters resulted in a perpendicular geometry of the phenyl boronic acid BODIPY (PBA-BODIPY) with respect to the GO plane, which enables only minor electronic GO-BODIPY interactions in the ground state. In this case, selective excitation of PBA-BODIPY was easily achieved, allowing to investigate the excited state interactions. A quantitative ultrafast energy transfer from PBA-BODIPY to GO was observed. Furthermore, due to the reversible dynamic nature of the covalent GO-PBA-BODIPY linkage, some PBA-BODIPY is free in solution and, hence, not quenched from GO. This resulted in a weak, but detectable fluorescence from the PBA-BODIPY that will allow to exploit GO-PBA-BODIPY for slow release and imaging purposes.
BODIPY
Cite
Citations (6)
BODIPY
Lipid droplet
Cite
Citations (91)
Biocompatibility
Iron oxide nanoparticles
Superparamagnetism
Cite
Citations (46)
BODIPY
Cite
Citations (22)
Boron dipyrromethene(BODIPY) fluorophores are used as fluorescent probes in a number of applications,primarily owing to theirs remarkable advantages which are reviewed in this paper briefly.Then,three typical synthetical routes for this series of dyes are described.Moreover,the development history of short wavelength and long wavelength BODIPY structures are introduced in detail.The last,we summarize the research progress of BODIPY at present and prospect the applied tendency of this kind of dyes.
BODIPY
Excitation wavelength
Cite
Citations (0)
BODIPY
Water soluble
Cite
Citations (119)
BODIPY
Rational design
Cite
Citations (112)
BODIPY
Moiety
Non-covalent interactions
Cite
Citations (14)
A method to fluorescently stain the surfaces of both Gram-negative and Gram-positive bacterial cells compatible with super-resolution fluorescence microscopy is presented. This method utilizes a commercially-available fluorescent probe to label primary amines at the surface of the cell. We demonstrate efficient staining of two bacterial strains, the Gram-negative Shewanella oneidensis MR-1 and the Gram-positive Bacillus subtilis 168. Using structured illumination microscopy and stochastic optical reconstruction microscopy, which require high quantum yield or specialized dyes, we show that this staining method may be used to resolve the bacterial cell surface with sub-diffraction-limited resolution. We further use this method to identify localization patterns of nanomaterials, specifically cadmium selenide quantum dots, following interaction with bacterial cells.
Shewanella oneidensis
Gram staining
Stain
Cite
Citations (19)