Abstract
Cadmium telluride (CdTe) and silver-doped CdTe (CdTe/Ag) nanocrystals have been used to study the antibacterial activity against gram-positive bacteria (Streptococcus pneumoniae and Staphylococcus aureus) and gram-negative bacteria (Klebsiella pneumoniae and Escherichia coli) by disc diffusion method. Here, CdTe and CdTe/Ag nanocrystals have been prepared by chemical method and characterized by transmission electron microscope (TEM) and X-ray diffraction (XRD). TEM images show that both the nanocrystals are spherical in shape with an average diameter of 6 nm and 5 nm respectively, whereas XRD pattern indicates that these nanocrystals are cubic in structure. Further, nuclear magnetic resonance study as well as FTIR spectral study confirm that prepared nanocrystals are well capped by 3-marcaptopropionic acid. For antibacterial test, different concentrations from 1 to 10 μg ml−1 of CdTe and CdTe/Ag nanocrystals are placed in the agar broth against all the gram-positive and gram-negative bacterial strains. Here, Ampicillin and water have been used as a standard reference and a control respectively. It is found that both the nanocrystals are effective against all the bacterial strains and the zone of inhibition (ZOI) is measured after 24 h of incubation. But, CdTe/Ag nanocrystals show much more ZOI than CdTe nanocrystals. Among the gram-positive bacteria, these nanocrystals are more effective against S. pneumonia (ZOI-9 mm for 1 µg ml−1), compared to S. aureus (ZOI-8 mm for 1 µg ml−1). Whereas, among the gram-negative bacteria, activity is more against the E. Coli (ZOI-8 mm for 1 µg ml−1) than that in K. pneumonia (ZOI-6.5 mm for 1 µg ml−1).
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Acknowledgement
All the authors are grateful to the SAIF (NEHU), Shillong for TEM micrograph and also Mr. Krishna Deb, Department of Physics, NIT Agartala, for the analysis of X-ray diffraction. The authors are also thankful to FIST-DST Program Govt. of India (Ref. NO. SR/FST/PSI-191/2014, Dated 21.11.2014) for providing financial grant to the Department. Additionally, authors are thankful to UGC-SAP, Govt. of India (Ref. No F.530/23/DRS-I/2018 (SAP-I) dated 24/04/2018) for the financial grant to the Department.
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Dey, P.C., Nath, P., Maiti, D. et al. Antibacterial activity of MPA-capped CdTe and Ag-doped CdTe nanocrystals: Showing different activity against gram-positive and gram-negative bacteria. Chem. Pap. 74, 3409–3421 (2020). https://doi.org/10.1007/s11696-020-01170-w
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DOI: https://doi.org/10.1007/s11696-020-01170-w