Journal
JOURNAL OF FOOD ENGINEERING
Volume 290, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jfoodeng.2020.110230
Keywords
beta-chitin; Squid pen dosidicus gigas; Polyvinyl alcohol/chitosan films; Micro- and nanoparticles; Mechanical film properties; Water vapour transmission; Water vapour permeability
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This study investigated the impact of beta-chitin micro- and nanoparticles derived from jumbo squid pens on the water vapor permeability of PVA/CS films. Addition of NPs significantly increased tensile strength and elongation percentage of the films, while WVP values did not change significantly among different PVA/CS proportions but were significantly lower in the second period.
Polyvinyl alcohol/chitosan (PVA/CS) films, which may be a good alternative for food packaging, have a limited vapour water barrier. This study investigated, the effect of beta-chitin micro- and nanoparticles (MPs and NPs, respectively) obtained from jumbo squid (Dosidicus gigas) pens on the water vapour permeability (WVP) of PVA/CS films. By milling beta-chitin, squid MPs (sizes of 128 mu m; MpQ128) were obtained, and an aqueous acid dispersion of MpQ128 was ultrasonicated to obtain NPs. Besides, PVA/CS films with three different proportions were prepared. The addition of MpQ128 did not increase the thickness or tensile strength (TS) of these films. The percentage elongation (%E) of the film increased only in one of the PVA/CS film proportions. The addition of NPs in this PVA/CS film did not increase the film thickness; however, the TS and %E increased significantly compared to those of the control sample, and the increase in %E was significantly higher with NPs than with MPs.Moreover, the PVA film exhibited biphasic water loss kinetics, and the film showed three-phase behaviour for various CS amounts. The WVP values did not significantly change for different PVA/CS proportions during each experimental period. However, in the second period, the WVP was significantly lower than in the first and third periods. The addition of MPs or NPs did not significantly decrease the WVP compared to that of the control sample. Nevertheless, it decreased slightly for some NP additions in the films. The effectiveness of beta-chitin NPs in reducing the WVP can be improved by avoiding the aggregation of NPs in hydrophilic PVA/CS films.
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