Abstract
We suggest green rust (GR), one of layered nanoclays, as a potential oxygen scavenger. In order to achieve controlled oxygen scavenging ability, GRs were prepared with either sulfate or conducting polymer. X-ray diffraction (XRD) patterns showed that both GRs had hydrotalcite phase with slight differences in crystallinity upon anion type. X-ray adsorption spectra (XAS) indicated that the local structure of both GRs were similar regardless of the type of anion. On the other hand, zeta-potential values of GRs were different from each other according to the type of anion; GR with sulfate showed positive charge and GR with conducting polymer had slight negative charge due to the homogeneous hybridization. Scanning electron microscopy (SEM) also suggested that the hybridization of conducting polymer and GR was fairly homogenous without the formation of phase segregation or serious aggregation. According to the oxygen-scavenging activity test, GR with conducting polymer showed a retarded oxygen-scavenging rate compared with GR with sulfate due to protection and controlled oxidation-reduction by hybridized polymer. The current results suggested that the hybridization of nanoclay with conducting polymer could be utilized in long-term oxygen scavenging applications with a controlled oxidation-reduction reaction.
Highlights
Various food products are sensitive to the external environment such as microbial attack [1] and deterioration by atmospheric oxygen [2]
It is notable that the green rust (GR)-PEDOT showed a larger number of repeated (00l) peaks with higher intensity than GR-SO4, which would be attributed to the different crystallinity of GR in the presence of the polymer
We synthesized the GRs with an interlayer anion SO4 2− or PEDOT:PSS for comparing the oxygen-scavenging property depending on the interlayer anion of GRs
Summary
Various food products are sensitive to the external environment such as microbial attack [1] and deterioration by atmospheric oxygen [2]. These inevitably result in depreciation and a decrease in consumers’ preference [3]. Many researchers have studied gas barrier packaging or oxygen-scavenging materials enclosed in packaging. Svagan et al reported that polylactide film with 40 bilayer coating of montmorillonite/chitosan reduced oxygen permeability by about 90–95% at 20–50% relative humidity (RH) [6]. The preparation of carboxymethylated microfibrillated cellulose film was suggested to achieve low oxygen permeability at low RH by
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