Influence of grape pomace extract incorporation on chitosan films properties
authors Ferreira, AS; Nunes, C; Castro, A; Ferreira, P; Coimbra, MA
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Solubility; Atomic force microscopy; Mechanical properties'; Antioxidant activity; Edible films
keywords ANTIOXIDANT ACTIVITY; MOLECULAR-WEIGHT; ESSENTIAL OIL; PHYSICOCHEMICAL CHARACTERIZATION; ANTIMICROBIAL PROPERTIES; MECHANICAL-PROPERTIES; FOOD APPLICATIONS; COMPOSITE FILMS; SEED EXTRACT; FATTY-ACIDS
abstract Chitosan has been studied as a renewable polymer to form edible films allowing the incorporation of functional compounds. The aim of this work was to evaluate the effects in the chitosan films properties of the incorporation of grape pomace extracts: 0.15% of hot water extract (mainly polysaccharides), 0.15 and 0.3% of chloroform extract (wax), and 0.3 and 0.75% of n-hexane extract (oil). The evaluation of the surface morphology revealed that the films with the aqueous extract had the most homogeneous and smoother topography. The incorporation of higher proportion of wax and oil led to changes in mechanical properties of the films, namely lower resistance and stiffness. The chitosan-based films with 0.75% oil demonstrated a 75% decrease of solubility in water, due to their hydrophobicity, as confirmed by the contact angle and surface free energy measurements. The hydrophobic films showed higher antioxidant capacity in organic medium (ABTS and DPPH assays) whereas the most hydrophilic films showed an improvement in FRAP and reducing power assays. Therefore, all the chitosan-based films prepared by incorporation of these grape pomace extracts are promising for food shelf life extension. (C) 2014 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2014
volume 113
beginning page 490
ending page 499
digital object identifier (doi) 10.1016/j.carbpol.2014.07.032
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000343613000061
link 25256511
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journal analysis (jcr 2019):
journal impact factor 7.182
5 year journal impact factor 6.89
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