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NANOTECHNOLOGY IN THE FOOD CHAIN - Favv

NANOTECHNOLOGY IN THE FOOD CHAIN - Favv

114 by application of a

114 by application of a membrane containing 2500 mg bio-Ag 0 m -2 in a submerged plate membrane reactor operated at a flux of 3.1 L m -2 h -1 . After filtration of 31 L m -2 , the concentration of Ag + was below the drinking water limit (= 100 μg L -1 ). In addition, a virus decline of > 3 log was achieved at a high membrane flux of 75 L m -2 h -1 . This is the first report to demonstrate water disinfection by immobilization of bio- Ag0 in polymeric membranes. This membrane technology might become a safe alternative for water disinfection or can enhance disinfection efficacy in conjunction with existing techniques. This work is submitted for publication in the journal ‘Water Research’. References _______________________________________________ De Gusseme B., Sintubin L., Baert L., Thibo E., Hennebel T., Vermeulen G., Uyttendaele M., Verstraete W. & Boon N. 2010. Biogenic silver for disinfection of water contaminated with viruses. Applied and Environmental Microbiology 76, 1082-1087. Hennebel T., De Gusseme B., Boon N. & Verstraete W. 2009. Biometals for advanced water treatment. Trends in Biotechnology 27, 90-98. Sintubin L., De Gusseme B., Verstraete W. & Boon N. 2010. The antibacterial activity of biogenic nanosilver and its mode of action. Appl. Environ. Microbiol., Submitted. Sintubin L., De Windt W., Dick J., Mast J., van der Ha D., Verstraete W. & Boon N. 2009. Lactic acid bacteria as reducing and capping agent for the fast and efficient production of silver nanoparticles. Appl. Microbiol. Biotechnol. 84(4), 741-749.

Zinc oxide: a promising material for improving future food packaging Lize Jaspers 1,2 , Nadia Lepot 1 , Ken Elen 2 , Roos Peeters 1 , Jules Mullens 2 , An Hardy 2,3 & Marlies K. Van Bael 2,3 1 XIOS Hogeschool Limburg, VerpakkingsCentrum, Universitaire Campus Diepenbeek, Agoralaan – Building H, B-3590 Diepenbeek, Belgium 2 Hasselt University, Institute for Materials Research, Inorganic and Physical Chemistry, Agoralaan – Building D, B-3590 Diepenbeek, Belgium 3 IMEC vzw, Division IMOMEC, Agoralaan – Building D, B-3590 Diepenbeek, Belgium E-mail: marlies.vanbael@uhasselt.be Food packaging has many different functions. One important function is to maintain the food quality by reducing absorption, desorption and diffusion of gases. Barrier properties can be improved by combining packaging materials with other high-barrier materials through coating, blending, lamination or metallization. A recent method for improving polymer properties are nanocomposites: polymers filled with particles with at least one dimension in the nanometre range, e.g. nanoclay. An alternative for nanoclay into the polymer matrix can be the use of inorganic nanoparticles, such as zinc oxide. The incorporation of zinc oxide nanoparticles in either conventional plastics, such as polypropylene (PP), or biodegradable polymers, such as polycaprolacton (PCL), has been the topic of the research here presented. Zinc oxide nanopowders with varying morphologies (i.e. rods, plates, spheres) and dimensions are synthesized by means of solvothermal or hydrothermal methods and subsequently incorporated into the polymer matrix to form a nanocomposite foil. From preliminary results it can be concluded that the morphology of zinc oxide nanoparticles can have an influence on the gas permeability and the mechanical properties as well as on the UV properties of the polymer. Another approach to improve both gas barrier and UV properties is by depositing zinc oxide nanolayers on top of the substrate. Various methods, including vacuum based and solution based routes, exist for the deposition of ZnO coatings. As there is a growing interest to use biodegradable polymers based on renewable materials, 115

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