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Post-functionalization of sulfur quantum dots and their aggregation-dependent antibacterial activity

Mondal, A and Pandit, S and Sahoo, J and Subramaniam, Y and De, M (2023) Post-functionalization of sulfur quantum dots and their aggregation-dependent antibacterial activity. In: Nanoscale, 15 (46). pp. 18624-18638.

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Official URL: https://doi.org/10.1039/d3nr04287a


Sulfur quantum dots (SQDs) have emerged as an intriguing class of luminescent nanomaterial due to their exceptional physiochemical and optoelectronic properties. However, their biomedical application is still in its infancy due to the limited scope of their surface functionalization. Herein, we explored the surface functionalization of SQDs through different thiol ligands with tuneable functionality and tested their antibacterial efficacy. Notably, very high antibacterial activity of functionalized SQDs (10-25 ng ml�1) was noted, which is 105 times higher compared to that of nonfunctionalized SQDs. Moreover, a rare phenomenon of the reverse trend of antibacterial activity through surface modification was observed, with increasing surface hydrophobicity of various nanomaterials as the antibacterial activity increased. However, we also noted that as the surface hydrophobicity increased, the SQDs tended to exhibit a propensity for aggregation, which consequently decreased their antibacterial efficacy. This identical pattern was also evident in in vivo assessments. Overall, this study illuminates the importance of surface modifications of SQDs and the role of surface hydrophobicity in the development of antibacterial agents. © 2023 The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Nanoscale
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to publisher
Keywords: Hydrophobicity; Medical applications; Nanocrystals; Nanostructured materials; Semiconductor quantum dots; Sulfur, Anti-bacterial activity; Antibacterial efficacy; Biomedical applications; Functionalized; Optoelectronics property; Physio-chemical properties; Postfunctionalization; Surface Functionalization; Surface hydrophobicity; Surface-modification, Agglomeration, antiinfective agent; nanomaterial; quantum dot; sulfur, chemistry; luminescence, Anti-Bacterial Agents; Luminescence; Nanostructures; Quantum Dots; Sulfur
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 29 Feb 2024 06:29
Last Modified: 29 Feb 2024 06:29
URI: https://eprints.iisc.ac.in/id/eprint/83753

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