Original ArticleInhibition of Candida albicans biofilm by pure selenium nanoparticles synthesized by pulsed laser ablation in liquids
Graphical Abstract
Sequence of a three steps mechanism displaying the interaction between pure selenium nanoparticles and Candida albicans biofilm.
Section snippets
Materials and synthesis
One requirement for nanomaterials to be used in medical applications is to have the surface of the nanomaterial free of any contamination, including residual chemicals from the synthesis process. This is the main advantage of synthesizing nanoparticles by Pulsed Laser Ablation in Liquids (PLAL). It is known that selenium can have different allotropic structures: trigonal, monoclinic (α-, β-), cubic (α-, β-), rhombohedric, ortho-rhombic and amorphous.26 However, the most common allotropic phases
Synthesis of Se NPs and laser-induced bubbles
Shortly after the irradiation begins, a “screening” bubble appears at the surface of the pellet centered at the location where the laser beam is incident to the surface of the target, (Figure 1). In PLAL, the process through which matter is ejected from the target directly depends on the pulse duration, irradiance and target properties. For a nanosecond pulse, it occurs via electron–phonon relaxation whereas for a femtosecond pulse it occurs mainly via photo-fragmentation.34 However, due to the
Discussion
Microbial colonization of medical devices is a widespread problem responsible of nosocomial infections.50 Once in use, the colonized medical devices can be difficult to treat if the opportunistic pathogen had developed resistance to antibiotics. This is especially true for C. albicans, a well-known pathogen, responsible of a variety of infections especially to immunocompromised patients (including HIV-infected and cancer patients).51 Indeed, C. albicans form generally a biofilm that protects
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Funding: This work was supported by the San Antonio Area Foundation Biomedical Research Grants Program and the National Institutes of Health [grant numbers G12MD007591, NIH/NIGMS RISE GM60655].