Abstract
Through tuning and optimizing the phenyl substituents and alkyl length, a series of pyridinium-functionalized amphiphiles possessing potent antibacterial activity toward three types of plant pathogenic bacteria were obtained. Investigations on the inhibition effect of substituents on the phenyl ring towards the bioactivity suggested that the substitutional group was not the crucial factor for the bioactivity. In comparison, the antibacterial effects could be significantly enhanced with increasing the length of alkyl chains. Among these amphiphiles, 6c, 6f, 6h, 6i, 6k, 6l, 6n, and 6q exhibited remarkable inhibition activities against the three pathogenic bacteria with the half-maximal effective concentration (EC50) values within 0.128–1.98 µg/mL. Furthermore, the minimum EC50 values against the pathogens Xanthomonas oryzae pv. oryzae and Xanthomonas axonopodis pv. citri could reach to 0.128 and 0.403 µg/mL, respectively, which were decreased about four times than those of our previous results. Given their simple synthesis and biocidal antibacterial activity, this kind of amphiphiles could be developed as promising bactericides against plant bacterial diseases.
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Acknowledgements
We acknowledge the financial support of the Key Technologies R&D Program (2014BAD23B01), National Natural Science Foundation of China (21372052, 21662009), the Research Project of Ministry of Education of China (20135201110005).
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Supplementary data (including experimental section; experimental characterization data of 6a-6q; the related 1H NMR, 13C NMR, and 19F NMR spectra of 6a-6q see Figure S1~S37) associated with this article (xxxxxx) can be found in the online version of this paper (DOI: xxxxxxxxxx). (DOCX 3845 kb)
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Wang, PY., Zhou, L., Zhou, J. et al. Potent antibacterial agents: pyridinium-functionalized amphiphiles bearing 1,3,4-oxadiazole scaffolds. Chem. Pap. 71, 1013–1018 (2017). https://doi.org/10.1007/s11696-016-0021-7
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DOI: https://doi.org/10.1007/s11696-016-0021-7