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Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
Published on: February 28, 2014
Chitosan-based films with incorporated supercritical CO2 hop extract: Structural, physicochemical, and antibacterial
Marijan Bajić1, Helena Jalšovec2, Andrea Travan3
1Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia.
Abstract:
Chitosan-based films with incorporated supercritical CO2 hop extract (HE) were developed and evaluated regarding structural, physicochemical, and antibacterial properties. The morphological and spectroscopic analyses have confirmed successful incorporation of HE into the polymer matrix, which affected films' structure and visual appearance. The presence of HE has caused a reduction in the hydrophilic character of films, but also provided a complete UV light blockage at wavelengths below 350 nm. Furthermore, a declining trend of tensile strength (from 14.4 MPa to 6.4 MPa) and Young's modulus (from 218.8 MPa to 26.9 MPa), as well as an ascending trend of elongation at break (from 10.7% to 35.1%), have been observed after the extract incorporation. The total phenolic content in the films was up to ∼13 mgGAE gfilm-1. Besides, the HE-loaded films exhibited antibacterial activity against foodborne pathogen Bacillus subtilis.
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