Component Migration of PVA/HNT Bionanocomposite Films
Polyvinyl alcohol (PVA)/starch (ST)/glycerol (GL)/halloysite nanotube (HNT) bionanocomposites at HNT contents of 0.25, 0.5, 1, 3 and 5 wt% were tested as food packaging materials based on their migration rates after contacting food simulants. The overall
- PDF / 418,661 Bytes
- 12 Pages / 439.37 x 666.142 pts Page_size
- 87 Downloads / 205 Views
Component Migration of PVA/HNT Bionanocomposite Films
Abstract Polyvinyl alcohol (PVA)/starch (ST)/glycerol (GL)/halloysite nanotube (HNT) bionanocomposites at HNT contents of 0.25, 0.5, 1, 3 and 5 wt% were tested as food packaging materials based on their migration rates after contacting food simulants. The overall migration rates of PVA/ST/GL blends and their bionanocomposites in hydrophilic simulant exceed the standard overall migration limit due to their solubility in hydrophilic media, while the migration rates in acidic and lipidic food simulants are still much lower than the standard overall migration limit (OML) due to their limited interactions with similar media. Finally, PVA/ST/GL/ HNT bionanocomposites have been identified to be successfully used to pack peaches and freshly cut avocados with lower weight losses by 34 and 38.22%, respectively, when compared with those of corresponding controlled fruit samples.
Keywords Bionanocomposites Overall migration rate nanoparticles Food packaging Shelf life
Migration rate of
When nanocomposite films start to be in contact with foodstuffs, the migration rate of constituents in bionanocomposite films needs to be taken into account. The migration process can be simply defined as the mass transfer of low-molecularweight molecules from packaging materials to packed products like foodstuffs [1, 2]. The migrated molecules may be plasticisers, nanofillers and other additives like surfactants [1, 2]. Furthermore, the migration rates of these molecules are deemed as a function of their molecular weight, concentration, solubility and diffusivity, as well as other conditions like pH level, temperature and contact time between packaging materials and packed products [1, 3]. Migration process can be considered as a diffusion process according to Fick’s second law [4]. The European Commission Regulation (EU) No. 10/2011 [5] specifies the safety limit for the migrated molecules should not exceed the OML of 60 mg/kg onto foodstuffs, which is equivalent to 10 mg/dm2 for packaging materials. Moreover, the European Commission Regulation (EU) No. 10/2011 [5] clearly indicates the limits for some elements like barium, copper, cobalt, iron, lithium, manganese and zinc. Consequently, the migration process in terms of overall migration rate and HNT © Springer Nature Singapore Pte Ltd. 2020 Z. W. Abdullah and Y. Dong, Polyvinyl Alcohol/Halloysite Nanotube Bionanocomposites as Biodegradable Packaging Materials, https://doi.org/10.1007/978-981-15-7356-9_6
153
154
6 Component Migration of PVA/HNT Bionanocomposite Films
migration rate have been covered in this chapter, and their results can be implemented to present the validity of bionanocomposite films as food packaging materials.
6.1
Overall Migration Rate
The overall migration rates of PVA/ST/GL blend and its corresponding bionanocomposite films at different HNT contents were evaluated in three food simulants, as illustrated in Fig. 6.1. These food simulants, including a 10% ethanol solution (simulant A), a 3% acidic acid so
Data Loading...
