Bio-Hybrid Nanocomposite Coatings from Polysaccharides and Nanoclay
In recent years a lot of effort has been aimed at developing new bio-hybrid nanocomposite barrierpackaging materials for foods. Nanocomposite films and coatings with improved properties were producedfrom nanoclay and polysaccharides such as ultrasonic dispersed chitosan and high pressure fluidized pectin.The intercalation of chitosan in the silicate layers was confirmed by the decrease of diffraction angles whilethe chitosan/nanoclay ratio increased. Nanocomposite films and multilayer coatings had improved barrierproperties against oxygen, water vapor, grease and UV-light transmission. Oxygen transmission wassignificantly reduced under all humidity conditions. In dry conditions, over 99% reduction and at 80% relativehumidity almost 75% reduction in oxygen transmission rates was obtained. All chitosan coating raw materialswere generally recognized as safe (GRAS) and the calculated total migration was in all cases ≤ 6 mg/dm2,thus the coatings met the requirements set by the packaging legislation. Processing of the developed biohybridnanocomposite coated materials was safe as the amounts of released particles under rubbing conditionswere comparable to the particle concentrations in a normal office environment. Nanoclay-pectin hybrid filmformation and high shear induced orientation of nanoclay platelets were investigated by means of model surfaceswhich were prepared using high shear spincoating. After fluidization, the nanoclay formed uniform andlaterally oriented stacks consisting of approximately 15 individual nanoclay layers. Pectin films with differentnanoclay concentrations were prepared by casting. Nanocomposite films made of pectin and nanoclay showedimproved barrier properties against oxygen and water vapor. Films were also totally impermeable to grease.The developed bio-hybrid nanocomposite packaging materials can be potentially exploited as a safe and environmentallysound alternative for synthetic barrier packaging materials.
Jari Vartiainen Tekla Tammelin Jaakko Pere Unto Tapper Kalle N(a)ttinen Ali Harlin Mikko Tuominen
VTT Technical Research Centre of Finland, P.O.Box 1000, FI-02044 VTT, Finland Espoo, Finland Paper Converting and Packaging Technology Tampere University of Technology, P.O.Box 541, FI-33101 Tampere,Finland
国际会议
The 17th IAPRI World Conference on Packaging(第17届世界包装大会)
天津
英文
54-57
2010-10-12（万方平台首次上网日期，不代表论文的发表时间）