Title:Eco-Friendly Intracellular Biosynthesis of CdS Quantum Dots Using Pseudomonas
aeruginosa: Evaluation of Antimicrobial Effects and DNA Cleavage
Activities
Volume: 17
Issue: 1
Author(s): Necip Öcal*, Ahmet Ceylan and Fatih Duman
Affiliation:
- Department of Biology, Faculty of Science, Erciyes University, 38280, Kayseri, Turkey
Keywords:
Quantum dots, antimicrobial activity, biosynthesis, CdS, DNA cleavage, Pseudomonas aeruginosa.
Abstract:
Background: Intracellular biosynthesis of Quantum Dots (QDs) based on microorganisms
offers a green alternative and eco-friendly for the production of nanocrystals with superior
properties. This study focused on the production of intracellular CdS QDs by stimulating the detoxification
metabolism of Pseudomonas aeruginosa.
Methods: For this aim, Pseudomonas aeruginosa ATCC 27853 strain was incubated in a solution
of 1mM cadmium sulphate (CdSO4) to manipulate the detoxification mechanism. The intracellularly
formed Cd-based material was extracted, and its characterization was carried out by Transmission
Electron Microscopy (TEM), X-Ray Diffraction (XRD), Energy Dispersive X-ray (EDX)
and dynamic light scattering (DLS) analyses and absorption-emission spectra.
Results: The obtained material showed absorption peaks at 385 nm and a luminescence peak at
411 nm, and the particle sizes were measured in the range 4.63-17.54 nm. It was determined that
the material was sphere-shaped, with a cubic crystalline structure, including Cd and S elements.
The antibacterial and antifungal activities of CdS QDs against patent eleven bacterial (four Grampositive
and seven Gram-negative) and one fungal strains were investigated by the agar disk diffusion
method. It was revealed that the obtained material has antibacterial effects on both Grampositive
and Gram-negative bacteria. However, cleavage activity of CdS QDs on pBR322 DNA
was not detected.
Conclusion: As a result, it has been proposed that the stimulation of the detoxification mechanism
can be an easy and effective way of producing green and cheap luminescent QDs or nanomaterial.