Melamine-promoted formation of bright and stable DNA-silver nanoclusters and their antimicrobial properties

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Title
Melamine-promoted formation of bright and stable DNA-silver nanoclusters and their antimicrobial properties
Author(s)
H Eun; W Y Kwon; K Kalimuthu; Y Kim; M Lee; Jungoh AhnHong-Weon Lee; S H Lee; H J Kim; H G Park; K S Park
Bibliographic Citation
Journal of Materials Chemistry B, vol. 7, no. 15, pp. 2512-2517
Publication Year
2019
Abstract
A new method has been developed for the preparation of brightly fluorescent and stable DNA-silver nanoclusters (DNA-AgNCs). The approach takes advantage of specific interactions occurring between melamine and thymine residues in a DNA template. These interactions cause the formation of a melamine-DNA-AgNC complex (Mel-DNA-AgNCs), in which a change in the environment of the DNA template causes binding of additional Ag+ and an enhancement in the fluorescence efficiency and stability. The effects of the nature of the template DNA, DNA?:?Ag+?:?NaBH4 ratio, pH and temperature were systematically assessed in order to maximize the melamine-promoted fluorescence enhancement. The results show that the Mel-DNA-AgNCs, generated under the optimal conditions, exhibit a ca. 3-fold larger fluorescence efficiency and long-term stability (70 d) in contrast to those of DNA-AgNCs in the absence of melamine. Importantly, the bright and stable Mel-DNA-AgNCs exhibit antimicrobial activities against Gram-positive and Gram-negative bacteria that are superior to those of DNA-AgNCs alone. To the best of our knowledge, this is the first report describing the synthesis of DNA-AgNCs that have improved fluorescence efficiencies and that function as effective antimicrobial agents.
ISSN
2050-750X
Publisher
Royal Soc Chem
DOI
http://dx.doi.org/10.1039/c8tb03166e
Type
Article
Appears in Collections:
Division of Bio Technology Innovation > BioProcess Engineering Center > 1. Journal Articles
Division of Bio Technology Innovation > 1. Journal Articles
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