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Molecules 2017, 22(11), 1975; doi:10.3390/molecules22111975

Chitosan/Cyclodextrin/TPP Nanoparticles Loaded with Quercetin as Novel Bacterial Quorum Sensing Inhibitors

1
Institute for Biology and Biotechnology of Plants, University of Münster, Schlossgarten 3, 48149 Münster, Germany
2
Department of Biology, Faculty of Biotechnology, Vietnam National University of Agriculture, Ngo Xuan Quang Street, Hanoi 100000, Vietnam
3
School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, UK
*
Author to whom correspondence should be addressed.
Received: 18 October 2017 / Revised: 12 November 2017 / Accepted: 13 November 2017 / Published: 15 November 2017
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Abstract

The widespread emergence of antibiotic-resistant bacteria has highlighted the urgent need of alternative therapeutic approaches for human and animal health. Targeting virulence factors that are controlled by bacterial quorum sensing (QS), seems a promising approach. The aims of this study were to generate novel nanoparticles (NPs) composed of chitosan (CS), sulfo-butyl-ether-β-cyclodextrin (Captisol®) and/or pentasodium tripolyphosphate using ionotropic gelation technique, and to evaluate their potential capacity to arrest QS in bacteria. The resulting NPs were in the size range of 250–400 nm with CS70/5 and 330–600 nm with CS70/20, had low polydispersity index (<0.25) and highly positive zeta potential ranging from ζ ~+31 to +40 mV. Quercetin, a hydrophobic model flavonoid, could be incorporated proportionally with increasing amounts of Captisol® in the NPs formualtion, without altering significantly its physicochemical properties. Elemental analysis and FTIR studies revealed that Captisol® and quercetin were effectively integrated into the NPs. These NPs were stable in M9 bacterial medium for 7 h at 37 °C. Further, NPs containing Captisol® seem to prolong the release of associated drug. Bioassays against an E. coli Top 10 QS biosensor revealed that CS70/5 NPs could inhibit QS up to 61.12%, while CS70/20 NPs exhibited high antibacterial effects up to 88.32%. These results suggested that the interaction between NPs and the bacterial membrane could enhance either anti-QS or anti-bacterial activities. View Full-Text
Keywords: quercetin; chitosan; Captisol®; cyclodextrin; nanoparticles; quorum sensing inhibitors; E. coli Top 10 quercetin; chitosan; Captisol®; cyclodextrin; nanoparticles; quorum sensing inhibitors; E. coli Top 10
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MDPI and ACS Style

Thanh Nguyen, H.; Goycoolea, F.M. Chitosan/Cyclodextrin/TPP Nanoparticles Loaded with Quercetin as Novel Bacterial Quorum Sensing Inhibitors. Molecules 2017, 22, 1975.

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