Abstract
The aim of the present study was to produce lactoferrin (L) and chitosan (C) nanoparticles by ionic cross-linking with TPP and thereby increase the antimicrobial activity of biopolymers. The nanoparticles were synthesized in different proportions of biopolymers and TPP and characterized regarding their size, zeta potential, morphology, chemical interactions, structural characteristics, and antibacterial activity. They were also applied as coatings on strawberries with the aim of increasing fruit shelf-life. Circular dichroism spectra revealed that the addition of TPP altered the secondary structure of lactoferrin. The nanoparticles 3.5L:5.5C:1TPP and 4.5L:4.5C:1TPP showed higher zeta potential values and lower hydrodynamic diameters (+39.30 mV, 81.87 nm and +33.07 mV, 97.67 nm, respectively) and intense bacteriostatic action against S. aureus (0.0370 mg/ml and 0.0463 mg/ml, respectively). The minimum inhibitory concentration of these nanoparticles was three times lower than those of pure biopolymers. When applied to strawberries coating, the nanoparticles delayed the ripening and degradation of the fruit. These results confirm that it is possible to intensify the antimicrobial properties of lactoferrin and chitosan through ionic cross-linking with TPP and, thus, expand their use as natural food preservatives.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
References
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Acknowledgements
The authors are grateful for access to the ZetaSizer Nano-ZS equipment from the Biomembrane Laboratory of the Institute of Biology–Unicamp. This research used facilities of the Brazilian Nanotechnology National Laboratory (LNNano), part of the Brazilian Centre for Research in Energy and Materials (CNPEM), a private nonprofit organization under the supervision of the Brazilian Ministry for Science, Technology, and Innovations (MCTI). The staff is acknowledged for assistance during the experiments (TEM 27381).
Funding
This study was supported by National Council for Scientific and Technological Development–CNPq, Brazil (#140320/2017–2, #142480/2020–7), Coordination for the Improvement of Higher Education Personnel–CAPES, Brazil (#001), and São Paulo Research Foundation–FAPESP, Brazil (#2015/26359–0).
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Larissa G. R. Duarte: Investigation; formal analysis; writing, original draft; data curation; Visualization; methodology; validation. Natália C.A. Ferreira: Investigation. Ana Clara T. Fiocco: Formal analysis, Investigation. Carolina S. F. Picone: Conceptualization; resources; supervision; writing, review and editing; project administration; funding acquisition.
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Duarte, L.G.R., Ferreira, N.C.A., Fiocco, A.C.T.R. et al. Lactoferrin-Chitosan-TPP Nanoparticles: Antibacterial Action and Extension of Strawberry Shelf-Life. Food Bioprocess Technol 16, 135–148 (2023). https://doi.org/10.1007/s11947-022-02927-9
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DOI: https://doi.org/10.1007/s11947-022-02927-9