Development of a chitosan-montmorillonite nanocomposite film containing Satureja hortensis essential oil

مجله پژوهشهای علوم و صنایع غذایی ایران

Article 4, Volume 13, Issue 6 - Serial Number 48, January and February 2018, Pages 131-143   

Document Type: Research Article-en

DOI: 10.22067/ifstrj.v1396i13.64248

Authors

Vahid Alizadeh; Hassan Barzegar^* ; Behzad Nasehi; Vahid Samavati

Department of Food Science and Technology, Ramin Agriculture and Natural Resources University of Khuzestan, Iran.

Abstract

The present work describes the physicochemical and antimicrobial properties of active films developed by incorporating different concentrations (0.5, 1, and 2% v/v) of Satureja hortensis essential oil (SEO) and 3% (w/w) nanoclay into a chitosan- montmorillonite nanocomposite film. The tensile strength (TS) of the films significantly decreased and elongation at break (EAB) increased with the incorporation of SEO. The control film exhibited the lowest water vapor permeability. In addition, decreases in water solubility (WS) and transparency were observed with increasing the concentration of SEO. Thermogravimetric analysis (TGA) indicated that films incorporated with SEO exhibited a higher degradation temperature compared with the control. The structural properties and morphology of the nanocomposite films were examined by X-ray diffractometry (XRD) and Scanning electron microscopy (SEM). SEO-incorporated films were more effective against gram positive bacteria (Staphylococcus aureus and Bacillus cereus) than gram negative ones (Salmonella typhimurium and Escherichia coli). The results suggested that SEO, as a natural antibacterial agent, has the potential to be applied in antimicrobial biodegradable films.

Keywords

Nanocomposite film; Chitosan; Satureja hortensis; Essential oil; Antimicrobial

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