Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities
1
Department of Chemistry, Bar-Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 52900, Israel
2
School of Chemistry, University College Cork, T12 YN60 Cork, Ireland
*
Author to whom correspondence should be addressed.
Nanomaterials 2021, 11(2), 369; https://doi.org/10.3390/nano11020369
Received: 30 December 2020
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Revised: 13 January 2021
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Accepted: 29 January 2021
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Published: 2 February 2021
Carbon dots (CDs) were obtained from medicinal turmeric leaves (Curcuma longa) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; Escherichia coli, Klebsiella pneumoniae, and two gram-positive counterparts; Staphylococcus aureus, S. epidermidis. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λex/em = 362/429 nm with a bright blue color in an aqueous solution. The CDs showed strong photostability under various environmental conditions (pH, salt, and UV-radiation). The complete bactericidal potency of CDs was 0.25 mg/mL for E.coli and S. aureus after 8 h of exposure, while for K. pneumoniae, and S. epidermidis, the CDs at 0.5 mg/mL good antibacterial effect within 8 h and complete eradication after 24 h of exposure is observed. The release of reactive oxygen species played a crucial role in the death of the bacterial cell. The present study provides a strategy for the preparation of CDs from a medicinal plant and their potential antibacterial activities against four common contagious pathogens.
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Keywords:
Curcuma longa; carbon dots; fluorescence; photostability; bactericidal property
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MDPI and ACS Style
Saravanan, A.; Maruthapandi, M.; Das, P.; Luong, J.H.T.; Gedanken, A. Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities. Nanomaterials 2021, 11, 369. https://doi.org/10.3390/nano11020369
AMA Style
Saravanan A, Maruthapandi M, Das P, Luong JHT, Gedanken A. Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities. Nanomaterials. 2021; 11(2):369. https://doi.org/10.3390/nano11020369
Chicago/Turabian StyleSaravanan, Arumugam, Moorthy Maruthapandi, Poushali Das, John H.T. Luong, and Aharon Gedanken. 2021. "Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities" Nanomaterials 11, no. 2: 369. https://doi.org/10.3390/nano11020369
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