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Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities.


ABSTRACT: 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 ?ex/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.

SUBMITTER: Saravanan A 

PROVIDER: S-EPMC7912860 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities.

Saravanan Arumugam A   Maruthapandi Moorthy M   Das Poushali P   Luong John H T JHT   Gedanken Aharon A  

Nanomaterials (Basel, Switzerland) 20210202 2


Carbon dots (CDs) were obtained from medicinal turmeric leaves (<i>Curcuma longa</i>) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; <i>Escherichia coli</i>, <i>Klebsiella pneumoniae</i>, and two gram-positive counterparts; <i>Staphylococcus aureus</i>, <i>S. epidermidis</i>. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λ<sub>ex</sub>/<sub>em</su  ...[more]

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