title: Changes induced by UV radiation in the presence of sodium benzoate in films formulated with polyvinyl alcohol and carboxymethyl cellulose.
abstract: This work was focused on: i) developing single and blend films based on carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVOH) studying their properties, ii) analyzing the interactions between CMC and PVOH and their modifications UV-induced in the presence of sodium benzoate (SB), and iii) evaluating the antimicrobial capacity of blend films containing SB with and without UV treatment. Once the blend films with SB were exposed to UV radiation, they exhibited lower moisture content as well as a greater elongation at break and rougher surfaces compared to those without treatment. Considering oxygen barrier properties, the low values obtained would allow their application as packaging with selective oxygen permeability. Moreover, the characteristics of the amorphous phase of the matrix prevailed with a rearrangement of the structure of the polymer chain, causing a decrease of the crystallinity degree. These results were supported by X-rays and DSC analysis. FT-IR spectra reflected some degree of polymer-polymer interaction at a molecular level in the amorphous regions. The incorporation of sodium benzoate combined with UV treatment in blend films was positive from the microbial point of view because of the growth inhibition of a wide spectrum of microorganisms. From a physicochemical perspective, the UV treatment of films also changed their morphology rendering them more insoluble in water, turning the functionalized blend films into a potential material to be applied as food packaging.
authors.affiliation: Faculty of Exact Sciences, UNLP, Argentina.
authors.forename: S
authors.initials: S
authors.lastname: Villarruel
authors.affiliation: Center for Research and Development in Food Cryotechnology (CCT-CONICET La Plata), 47 and 116, Argentina.
authors.forename: L
authors.initials: L
authors.lastname: Giannuzzi
authors.affiliation: Center for Research and Development in Food Cryotechnology (CCT-CONICET La Plata), 47 and 116, Argentina.
authors.forename: S
authors.initials: S
authors.lastname: Rivero
authors.affiliation: Center for Research and Development in Food Cryotechnology (CCT-CONICET La Plata), 47 and 116, Argentina; Faculty of Engineering, UNLP, La Plata 1900, Argentina. Electronic address: acaimpronta@hotmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Pinotti
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry; D002175:Candida / Q000254:growth & development; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D004926:Escherichia coli / Q000254:growth & development; D008567:Membranes, Artificial; D010407:Penicillium / Q000254:growth & development; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012475:Salmonella / Q000254:growth & development; D020160:Sodium Benzoate / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D000890:Anti-Infective Agents; D008567:Membranes, Artificial; D011142:Polyvinyl Alcohol; D002266:Carboxymethylcellulose Sodium; D020160:Sodium Benzoate
keywords: Antimicrobial capacity; Blend films; CMC; PVOH; Sodium benzoate; UV radiation