Biocomposite films based on fish gelatin and chitosan containing Origanum vulgare L. essential oil (OEO) at0.4, 0.8, and 1.2% (w/v) were prepared by a solvent casting method and their physicochemical and antimi-crobial properties were examined. The results showed that the incorporation of OEO caused a significantdecrease (p < 0.05) in tensile strength (TS) and elastic modulus (EM), although no significant change wasobserved in elongation-at-break (EAB). Water vapor permeability (WVP) and solubility of films contain-ing OEO increased as the amount of oil increased (p < 0.05). Oregano essential oil-loaded films displayedsuperior barrier capability to ultraviolet light. Fourier transforms infrared (FTIR) spectra indicated thatthe interaction between polymer matrix and essential oil was occurred. The properties of the films wererelated with their microstructure, which was observed by scanning electron microscopy (SEM). Atomicforce microscopy (AFM) images showed that the surface roughness of the films was influenced by theinclusion of oil. OEO-incorporated films also exhibited higher antimicrobial activity against the gram-positive bacteria (Staphylococcus aureus and Listeria monocytogenes), and lower for gram-negative bacteria(Salmonella enteritidis and Escherichia coli). This study showed that OEO has the potential to prepare activeedible films.
کلید واژگان :BiocompositeActive filmOriganum vulgareL.Essential oilPackaging
ارزش ریالی : 600000 ریال
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