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.

Mechanical and moisture barrier properties of corn distarch phosphate film influenced by modified microcry stalline corn straw cellulose

“…This finding was similar to the results of Lizundia et al ., who reported a continuous increase of TS at the expense of ductility upon nanohybrids loading. It was found that the EAB depended on the interactions between the matrixes and the active components . Further, the excess amount of MMCSC affected the crystalline structure and microstructure of the films and led to a reduction of EAB …”

“…(a), FTIR spectra confirmed that the molecular chain structure of MCSC and cellulose segments held the same peaks when it was treated by ultrasonics and microwaves before and after. As with the research of Villarruel et al ., it was difficult to direct cleavage functional groups to form free radicals at lower energy levels …”

Effect of Incorporation Nanocrystalline Corn Straw Cellulose and Polyethylene Glycol on Properties of Biodegradable Films

“…Tensile test was an important evaluation of film properties, tensile strength was represented the maximum resistance until it was break. Using dynamic‐mechanical thermal equipment Q800 (USA) to test the mechanical properties of polyvinyl alcohol films and CMC films had been reported, and indicated that CMC films had the characteristics of stiff and brittle, while polyvinyl alcohol films had better flexibility (Villarruel and others ). As shown in Figure (A) and Table , TS and EAB of the CDP, CDP/CSC and CDP/NCSC films were presented.…”

“…Meanwhile, the EAB value of CDP, CDP/CSC, and CDP/NCSC films was 60.067%, 82.75%, and 65.9166%, respectively. It was found that the EAB might be depended on the interactions generated between the polymers and the active component (Villarruel and others ). The EAB value of CDP/NCSC was lower than CDP/CSC, it was due to the nanofiller prevents motion of polymer matrix (Atef and others ).…”

Antimicrobial packaging system for minimally processed fruit

“…Han and Floros (1997) found that potassium sorbate (1% w/w) incorporated in LDPE films not only extended the lag time of a bakery yeast but also reduced the growth rate and its maximum growth. Villarruel et al (2015) In general, potassium sorbate and sodium benzoate significantly inhibited the growth of spoilage flora in minimally processed fruit. As observed for the volatile antimicrobials, the application of potassium sorbate and/or sodium benzoate by dipping or as a coating were more often reported than active packaging applications.…”