Physical and antifungal properties of beta-cyclodextrin microcapsules and nanofibre films containing cinnamon and oregano essential oils

摘要

The aim of this study was to investigate the physical and antimicrobial properties of fabricated nanofibre for active packaging systems. Active microcapsules and nanofibres derived from precipitating beta-cyclodextrin (beta-CD) with cinnamon (CIN) and oregano (OREG) essential oils (EOs) were developed and their in vitro antifungal activity against Botrytis sp., an important fruit pathogen was determined. Solutions of beta-CD and CIN- or OREG-EOs were subjected to co-precipitation to induce micro-encapsulation. Thereafter, the properties of the complexed microcapsules were assessed. Solid-state nuclear magnetic resonance (NMR) showed the presence of new carbon peaks in the beta-CD complex spectra, which were absent in the plain beta-CD spectrum confirming encapsulation of EOs. Encapsulation of EOs was also confirmed by thermogravimetric analysis (TGA), which indicated that the thermal degradation of beta-CD-EO complex occurred over a lower temperature (270 degrees C) compared to plain beta-CD (300 degrees C). Gas chromatography-mass spectrometry (GC-MS) showed that the amount of volatile EOs released was lower for OREG-EO compared to CIN-EO. Electrospun active nanofibres (similar to 100-300 nm) were successfully fabricated from chitosan/polyvinyl alcohol/beta-cyclodextrin (CH/PVA/beta-CD) solution with EOs. The nanofibres ability to release EO volatiles and antifungal activity were confirmed. (C) 2017 Elsevier Ltd. All rights reserved.