چکیده (انگلیسی):

Objectives: To evaluate the contributions of the some quantum dots in different biological
uses in order to valorizes such nanomaterials for further applications.
Methods: Zinc sulfide ZnS nanoparticles were synthesized in aqueous medium at pH
constant, the obtained nanoparticles has been characterized by X-ray diffraction (XRD),
transmission electron microscopy (TEM) and Fourier Transform Infra-red (FTIR) spectroscopies.
Zinc sulfide nanoparticles were screened for their antibacterial and antifungal
profiling and tested for antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH),
hydroxyl radical (OH

) and hydrogen peroxide (H2O2) scavenging activity, ferric
reducing power (FRP) assay and ferrous ion chelating (FIC) methods.
Results: The sizes of the crystallites were estimated to 3 nm using the Debye-Scherrer
formula based on the XRD data. The shape was identified to be quasi-spherical with
agglomerated particles. The obtained ZnS quantum dots present an antioxidant activity
especially in oxido-reduction power, and can be used for species profiling either for
bacteria and fungus.
Conclusion: It was found that ZnS nanoparticles showed relatively higher antioxidant
activities and antibacterial with an antifungal behavior which proves that this nanomaterials
can react at the interface with the life entities.